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Tytuł:
Significance of the receding contact angle in the determination of surface free energy
Autorzy:
Chodkowski, Michał Paweł
Powiązania:
https://bibliotekanauki.pl/articles/2079958.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
Tematy:
receding contact angle
equilibrium contact angle
Tadmor’s contact angle
CAH
surface free energy
Opis:
Surface free energy measurements of solids are a very important issue in various fields of science. Many functional, chemical and physical properties of a given material depend on its surface free energy. The basic method of the surface free energy determination are the contact angle measurements. There are several empirical methods useful to calculate the surface free energy of solids. They are based on the measurements of the contact angle of liquids with the defined surface tension. The aim of this paper is to examine the significance of the receding contact angle measurements in the determination of surface free energy of solids.
Źródło:
Annales Universitatis Mariae Curie-Skłodowska, sectio AA – Chemia; 2018, 73, 1; 61-80
2083-358X
Pojawia się w:
Annales Universitatis Mariae Curie-Skłodowska, sectio AA – Chemia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wettability of hybrid chitosan/phospholipid coatings
Autorzy:
Jurak, Małgorzata
Wiącek, Agnieszka E
Powiązania:
https://bibliotekanauki.pl/articles/1034545.pdf
Data publikacji:
2017
Wydawca:
Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
Tematy:
chitosan/phospholipid films
contact angle hysteresis
surface free energy
Opis:
Solution spreading and Langmuir-Blodgett/Schaefer techniques were used for preparation of chitosan/phospholipid (DPPC) films on air plasma treated polyethylene terephthalate (PET) plates. The surface wetting properties were determined based on the measurements of the advancing and receding contact angles of water, formamide and diiodomethane. The contact angle hysteresis model of Chibowski was applied to estimate the total surface free energy values. The coatings properties were found to be affected by molecular organisation and packing depending on the preparation technique. Phospholipid molecules modified the chitosan film surface by changing the kind and magnitude of interactions, which is revealed in the values of surface free energy. These findings may be helpful for the development of new generation polymer-supported biocompatible coatings with anti-thrombogenic and anti-bactericidal properties, thus expanding the spectrum of chitosan applications.
Źródło:
Progress on Chemistry and Application of Chitin and its Derivatives; 2017, 22; 66-76
1896-5644
Pojawia się w:
Progress on Chemistry and Application of Chitin and its Derivatives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ocena kąta zwilżania oraz swobodnej energii powierzchniowej różnych typów materiałów stomatologicznych
Evaluation of the contact angle and surface free energy of different types of dental materials
Autorzy:
Dubiel, M.
Łagan, S.
Powiązania:
https://bibliotekanauki.pl/articles/98747.pdf
Data publikacji:
2013
Wydawca:
Politechnika Śląska. Katedra Biomechatroniki
Tematy:
zwilżalność
kąt zwilżania
swobodna energia powierzchniowa
model Owens’a-Wendt’a
wettability
contact angle
surface free energy
Owens-Wendt model
Opis:
Celem pracy było przeprowadzenie badań zwilżalności warstwy wierzchniej oraz oznaczenie swobodnej energii powierzchniowej dla wybranych typów materiałów stomatologicznych. W badaniach zrealizowanych w Zakładzie Mechaniki Doświadczalnej i Biomechaniki Politechniki Krakowskiej wykorzystano model Owens’a-Wendt’a, wymagający zastosowania dwóch cieczy (jednej polarniej, drugiej dyspersyjnej).
The aim of this study was to conduct studies of wettability of the surface layer and the surface free energy determination for selected types of dental materials. In a study carried out at the Department of Experimental Mechanics and Biomechanics, Technical University of Cracow model was used Owens-Wendt'a, requiring the use of two liquids (one polar, the other dispersion).
Źródło:
Aktualne Problemy Biomechaniki; 2013, 7; 39-42
1898-763X
Pojawia się w:
Aktualne Problemy Biomechaniki
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Volume Drop on Surface Free Energy of Glass
Autorzy:
Rymuszka, Diana
Terpiłowski, Konrad
Hołysz, Lucyna
Powiązania:
https://bibliotekanauki.pl/articles/951384.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
Tematy:
contact angle
surface free energy
Opis:
The aim of the research was to determine how the drop size affects the contact angle values and determine its optimal size for further contact angle measurements and comparison of the contact angle values measured for three probe liquids (water, formamide, diiodomethane) on the glass surface using the: sessile drop and tilting plate methods. Next, using the measured contact angles, the total surface free energy and its components were determined from the van Oss et al. (Lifshitz-van der Waals acid- base component, LWAB), Owens-Wendt, Neumann and contact angle hysteresis (CAH) approaches. The studies showed, that drop size is very important for contact angle measurements and consequently, for surface free energy estimation.
Źródło:
Annales Universitatis Mariae Curie-Skłodowska, sectio AA – Chemia; 2013, 68, 1-2
2083-358X
Pojawia się w:
Annales Universitatis Mariae Curie-Skłodowska, sectio AA – Chemia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Contact angle and surface free energy of fresh and stored pig’s skin
Autorzy:
Liber-Kneć, A.
Łagan, S.
Powiązania:
https://bibliotekanauki.pl/articles/285482.pdf
Data publikacji:
2017
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
skin tissue
surface free energy
biomaterials
Źródło:
Engineering of Biomaterials; 2017, 20, no. 143 spec. iss.; 10
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electrokinetic and surface properties of some methacrylate-based copolymers
Autorzy:
Ersoy, Bahri
Çiftçi, Hakan
Evcin, Atilla
Merdivenci, Yılmaz
Powiązania:
https://bibliotekanauki.pl/articles/2146940.pdf
Data publikacji:
2022
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
methacrylate copolymer
zeta potential
contact angle
hydrophobicity
surface free energy
Opis:
In this study, some electrokinetic and surface properties of MBAOM-GMA copolymers synthesized from 2-[(methoxy-1,3-benzothiazole-2-yl) amino]-2oxoethyl methacrylate (MBAOM) and glycidyl methacrylate (GMA) monomers were investigated. Accordingly, (i) pH-dependent zeta (ζ) potential changes of the copolymers were investigated under a constant ionic strength (in 1.10-3mol/dm3 NaCl) and the corresponding isoelectric points (iep) were determined, (ii) zeta potential changes depending on the salt concentration in the presence of mono-, di- and tri-valent metal salts were examined, (iii) contact angles (θ) of the copolymers with water were measured and their wetting behavior was assessed, and (iv) surface free energies (SFE) of the copolymers were determined by Acid-Base approach using Van Oss-Chaudhury-Good method. The compositions of the copolymers were 77% MBAOM - 23% GMA, 45% MBAOM - 55% GMA, and 19% MBAOM - 81% GMA. FeCl3, CaCl2, and KCl salts were used for the salt solutions for the zeta potential measurements. As a result, (i) it was determined that the chemical structure of methacrylate copolymers showed a decisive effect on both electrokinetic and surface properties, (ii) the hydrophobic character of copolymer increased with the increase of the GMA ratio, and correspondingly, the SFE decreased, and (iii) the iep of the copolymers varied between pH 3.1-3.7 depending on composition.
Źródło:
Physicochemical Problems of Mineral Processing; 2022, 58, 5; art. no. 152162
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wetting properties of chitosan-modified and plasma-treated peek surfaces
Autorzy:
Przykaza, Kacper
Jurak, Małgorzata
Wiącek, Agnieszka Ewa
Powiązania:
https://bibliotekanauki.pl/articles/1034399.pdf
Data publikacji:
2018
Wydawca:
Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
Tematy:
PEEK
chitosan films
contact angle
plasma activation
surface free energy
Opis:
In this paper, the wettability of chitosan/phospholipid (1,2-dipalmitoyl-sn-glycero-3-phosphocholine – DPPC), chitosan/lipid (cholesterol – Chol) and chitosan/protein (cyclosporine A – CsA) films on air plasma activated polyetheretherketone (PEEK) plates was studied. The layers were prepared using the solution spreading technique and their surface wetting properties were determined based on the measurements of the advancing and receding contact angles of water, formamide and diiodomethane. Moreover, based on the contact angle hysteresis model of Chibowski, values of total surface free energy were estimated. Significant changes in PEEK polarity were observed after plasma activation and modifications with Ch/DPPC, Ch/Chol and Ch/CsA layers. These molecules modulate the chitosan film surface by changing the type and magnitude of interactions, which is revealed in the values of surface free energy. These results may be important for the development and implementation of highly biocompatible bone substitution polymers coated with chitosan film with anti-fungal and anti-bactericidal properties. Those systems based on chitosan may also carry and release biologically active substances which could be relevant in the new generation of drug delivery systems.
Źródło:
Progress on Chemistry and Application of Chitin and its Derivatives; 2018, 23; 159-169
1896-5644
Pojawia się w:
Progress on Chemistry and Application of Chitin and its Derivatives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Control of glass surface wettability via esterification with n-alkyl alcohols
Autorzy:
Kruszelnicki, Mateusz
Polowczyk, Izabela
Kowalczuk, Przemyslaw B.
Powiązania:
https://bibliotekanauki.pl/articles/2146948.pdf
Data publikacji:
2022
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
hydrophobicity
surface free energy
contact angle
zeta potential
roughness
Opis:
Surface wettability plays an essential role in many processes and materials applications. It depends mainly on the surface roughness and chemical composition, thus through a controlled modification of these parameters, the wettability can be restrained. Glass is an inorganic solid material, composed mainly of amorphous silica, which surface, due to the presence of reactive hydroxyl groups, can be quite easily chemically modified. This feature can be used to control the wettability of glass by reaction with organic compounds. In this study, the esterification of glass silanol groups with n-alkyl alcohols (Cn/H2n+1/OH, n=3, 4, 6, 8, 10) was employed to modify its wettability. The effect of such modification on the physicochemical properties of glass surface was comprehensively investigated and characterised by the water contact angle, surface free energy, zeta potential, atomic force microscopy (AFM) and X-ray photoelectron spectroscopy (XPS) measurements. We demonstrate that the wettability of the esterified glass surface is strongly dependent on both the chain length of used alcohol and modification time. The alcohol molecule binds to the glass surface through a Si-O-C bond, leading to the formation of a monolayer that does not significantly affect the surface morphology and zeta potential. Conducted studies provided a broader view of the influence of this technique for modifying surface wettability on its physicochemical properties.
Źródło:
Physicochemical Problems of Mineral Processing; 2022, 58, 2; art. no. 145147
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of dry grinding on physicochemical and surface properties of talc
Autorzy:
Arsoy, Z.
Ersoy, B.
Evcin, A.
Icduygu, M. G.
Powiązania:
https://bibliotekanauki.pl/articles/109327.pdf
Data publikacji:
2017
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
talc
grinding
contact angle
surface free energy
oil absorption
whiteness
Opis:
In this study the effect of dry grinding on hydrophobicity, surface free energy (SFE), particle size distribution, surface area, porosity, oil absorption, and whiteness of talc was investigated. The dry grinding was performed in a vibrating ball mill at various grinding times (5-150 min) by keeping the grinding parameters constant such as the number of ball, ball size, the amount of talc, vibration frequency and amplitude. Then, the contact angle measurements were performed on disc-shaped samples produced under a hydraulic press by using a sessile drop method with different liquids (water, formamide, diiodomethane, and ethylene glycol), and surface free energies (mJ/m2) were calculated according to OCG-AB (van Oss-Chaudhury-Good Acid-Base) method by using the obtained contact angle values. In addition, the physicochemical analyses given above were carried out for each ground sample. According to the obtained results, the water contact angle and SFE of the original sample were 63.800 and 48.70 mJ/m2, respectively. The lowest and highest contact angle values for the samples were obtained as 59.300 and 70.770 at grinding times for 5 and 15 min, respectively. It was also determined that the grinding time over 30 min showed no significant effect on the contact angle and SFE values of the samples. Similarly, the grinding time vs. SFE, and the grinding time vs. contact angle curves showed a similar trend. Parallel to the increase in the surface area upon the grinding, a small increase in the oil absorption and whiteness of talc was also determined.
Źródło:
Physicochemical Problems of Mineral Processing; 2017, 53, 1; 288-306
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Effect of Active Diluent Addition on the Energy and Adhesive Properties of Epoxy Adhesive
Autorzy:
Krawczuk, Anna
Domińczuk, Jacek
Powiązania:
https://bibliotekanauki.pl/articles/103375.pdf
Data publikacji:
2018
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
contact angle
surface free energy
epoxy adhesives
adhesive joint
kąt zwilżania
wolna energia powierzchniowa
kleje epoksydowe
połączenie klejowe
Opis:
The paper reports values of surface free energy and its components of an epoxy adhesive modified by the addition of an active diluent. Wetting envelopes are determined and they serve as a basis for a wettability analysis and determining the possibility of maximizing the work of adhesion between the liquid and the solid. Static strength tests of adhesive joints made with the analysed adhesive compositions were also conducted. The results are used to determine the effect of active diluent addition on the energy and adhesive properties of the epoxy adhesive
Źródło:
Advances in Science and Technology. Research Journal; 2018, 12, 1; 19-25
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Studies of plasma treated styrene-based ionomers
Badania jonomerów styrenowych poddanych działaniu plazmy
Autorzy:
Kowalonek, J.
Kaczmarek, H.
Mikuła, E.
Powiązania:
https://bibliotekanauki.pl/articles/946960.pdf
Data publikacji:
2015
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Chemii Przemysłowej
Tematy:
low temperature plasma
styrene ionomers
contact angle
surface free energy
aging
plazma niskotemperaturowa
jonomery styrenowe
kąt zwilżania
swobodna energia powierzchniowa
Opis:
The aim of the work was to study changes in the surface polarity of styrene ionomers containing Li+, Na+, K+ and Cs+ acrylates after air plasma treatment and then to observe the hydrophobic recovery of these samples. Changes in the surface properties were studied by atomic force microscopy (AFM), by measuring contact angles and calculating the surface free energy and its components. The values of surface free energy and its polar component increased considerably after air plasma treatment, which indicated the presence of polar groups on the surfaces. However, these alterations in the sample surfaces were impermanent.
Zbadano zmiany polarności powierzchni jonomerów styrenowych, zawierających akrylany litu, sodu, potasu lub cezu, wywołane działaniem plazmy wytworzonej w powietrzu w funkcji czasu. Do oceny właściwości powierzchniowych zastosowano mikroskopię sił atomowych (AFM) oraz goniometrię. Na podstawie pomiarów kąta zwilżania obliczono swobodną energię powierzchniową i jej składowe. Pod wpływem działania plazmy wytworzonej w powietrzu wartości swobodnej energii powierzchniowej i jej składowej polarnej znacznie wzrosły, co wskazuje na zwiększenie liczby grup polarnych obecnych na powierzchni badanych próbek. Duża hydrofilowość modyfikowanej powierzchni, wywołana działaniem plazmy, zmniejszała się w funkcji czasu.
Źródło:
Polimery; 2015, 60, 4; 232-241
0032-2725
Pojawia się w:
Polimery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wettability and Surface Free Energy of Ti(C,N) Coatings on Nickel-based Casting Prosthetic Alloys
Autorzy:
Banaszek, K.
Klimek, L.
Powiązania:
https://bibliotekanauki.pl/articles/381148.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
dental alloy
wettability
contact angle
surface tension
surface free energy
stop dentystyczny
zwilżalność
kąt zwilżania
napięcie powierzchniowe
energia powierzchniowa swobodna
Opis:
The production process of prosthetic restorations runs in two stages. In the first stage, the prosthetic foundation is produced of metal alloys. In the second stage, a facing material is applied on the produced element. In both stages, the wettability is significantly important, as well as the free surface energy relating to it. The quality of the obtained cast depends on the surface phenomena occurring between the metal alloy and the material of which the casting mould is made. The performed examinations also point to a relation between the ceramics joint and the base, depending on the wetting angle. The aim of the presented paper was to examine influence of the composition of a Ti(C,N)-type coating on bases made of the Ni-Cr prosthetic alloy on the wettability and the surface free energy. The test material were disks made of the Ni-Cr alloy with the diameter of 8 mm. The disks were divided into five groups, which were covered with Ti(C,N) coatings, with different amounts of C and N in the layer. In order to determine the surface free energy (γs), the wetting angle was measured. Two measure liquids were applied: distilled water and diiodomethane. The obtained results of the measurements of the water-wetting angles suggest that together with the increase of the ratio of nitrogen to carbon in the Ti(C,N) coating, the surface hydrophobicity increases as well. In all the samples, one can see a large difference between the energy values of the polar and the apolar components. The high values of the polar components and the low values of the apolar ones make it possible to conclude that these surfaces exhibit a greater affinity to the polar groups than to the apolar ones. On the basis of the analysis of the surface free energy, one can state that covering the alloy with Ti(C,N)-type coatings should not decrease the adhesion of the ceramics to the alloy, whereas TiC coatings should lead to the latter’s improvement. Due to their hydrophilicity, TiC coatings should decrease the adhesion of bacteria to the surface and hinder the formation of a bacterial biofilm.
Źródło:
Archives of Foundry Engineering; 2015, 15, 3; 11-16
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wettability of quartz particles at varying conditions on the basis of the measurement of relative wetting contact angles and their flotation behaviour
Autorzy:
Gao, Shuling
Ma, Lifeng
Wei, Dezhou
Shen, Yanbai
Powiązania:
https://bibliotekanauki.pl/articles/109832.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
relative wetting contact angle
Washburn technique
surface free energy
flotation behaviour
sodium oleate
Opis:
In this paper, on the basis of a modified Washburn equation, the squared incremental pressure due to liquid rising vs. time were measured instead of wicking distances before reaching equilibrium, and the relative wetting contact angles (RWCA) were applied to characterize the surface wettability of quartz particles conditioned at different concentrations of flotation reagents. Combined with the flotation experiments on quartz particles at corresponding conditions, the relationship between flotation recoveries and RWCA was analysed, which proves that RWCA can characterize the surface wettability of quartz particles accurately. The results also showed that the best reagent conditions for floating quartz are pH 12.0, a Ca2+ concentration of 1×10-3 mol/dm3 and a sodium oleate concentration of 0.75×10-3 mol/dm3, where the recovery of quartz is 86%. The surface tension of the filtrate of the pulp was determined by a fully-automatic tensiometer as well. Based on the measured values of RWCA and surface tension, the free energy changes (ΔG) before and after the adhesion of bubbles and particles per unit area at corresponding situations were calculated, respectively. The trends of ΔG varying with the concentrations of reagents were in close accordance with those of RWCA and the flotation recoveries, proving that it is more likely for particles having bigger contact angles to adhere to bubbles, resulting in a higher flotation recovery. These results give a more feasible and accurate approach to analysing the surface wettability and floatability of fine particles.
Źródło:
Physicochemical Problems of Mineral Processing; 2019, 55, 1; 278-289
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Porównanie zwilżalności oraz swobodnej energii powierzchniowej biomateriałów i tkanki kostnej
Comperison of wettability and surface free energy of biomaterails and bone tissue
Autorzy:
Sobieska, S.
Zimowska, B.
Łagan, S.
Powiązania:
https://bibliotekanauki.pl/articles/98881.pdf
Data publikacji:
2013
Wydawca:
Politechnika Śląska. Katedra Biomechatroniki
Tematy:
kąt zwilżania
swobodna energia powierzchniowa
model Owens’a-Wendt’a
hydrofobowość
hydrofilowość
contact angle
surface free energy
Owens-Wendt model
hydrophobicity
hydrophilicity
Opis:
Celem przedstawionych badań było porównanie zwilżalności oraz swobodnej energii powierzchniowej tkanki kostnej i chrzęstnej pochodzenia zwierzęcego oraz wybranych biomateriałów, wykorzystując model Owens’a-Wendt’a. W badaniach przeprowadzonych w Zakładzie Mechaniki Doświadczalnej i Biomechaniki Politechniki Krakowskiej wyznaczono również kąt zwilżania tych materiałów.
The aim of this study was to compare the wettability and surface free energy of animal’s bone and cartilage and selected biomaterials, using the Owens-Wendt'a model. In a study conducted at the Department of Experimental Mechanics and Biomechanics, Technical University of Cracow designate the contact angle of the material.
Źródło:
Aktualne Problemy Biomechaniki; 2013, 7; 153-156
1898-763X
Pojawia się w:
Aktualne Problemy Biomechaniki
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ działania plazmy niskotemperaturowej na zmiany zwilżalności wybranych polimerów
Effect of low-temperature plasma on changes in wettability of selected polymers
Autorzy:
Hołysz, Lucyna
Kamela (Rymuszka), Diana
Terpiłowski, Konrad
Chibowski, Emil
Powiązania:
https://bibliotekanauki.pl/articles/1853718.pdf
Data publikacji:
2021
Wydawca:
Polskie Towarzystwo Chemiczne
Tematy:
polimer
plazma niskotemperaturowa
zwilżalność
kąt zwilżania
swobodna energia powierzchniowa
adhezja
polymer
low-temperature plasma
wettability
contact angle
surface free energy
adhesion
Opis:
The effects of air, oxygen and argon plasma treatment on wetting and energetic properties of polymers: polymethylmethacrylate (PMMA), polyetheretherketone (PEEK), polyoxymethylene (POM), polyamide (PA6G), polycarbonate (PC) and polypropylene (PP) were studied. The changes in surface properties of PMMA, PEEK, POM, PA6G polymers after the air plasma treatment, and PP and PC polymers after the Ar or O2 plasma treatment were determined via the measurement of advancing and receding contact angles of three liquids having different polarity, i.e. water, formamide and diiodomethane. Having the determined contact angles the surface free energy and its components of the polymers were calculated using three different theoretical approaches, namely: acid-base Lifsthitz-van der Waals (LWAB), contact angle hysteresis (CAH) and Owens and Wendt (O-W). The effects of plasma treatment were further determined by calculations of the adhesion work and work of spreading of water on modified polymer and compared to values calculated for the unmodified surfaces. Then for the PEEK and POM modified with the air plasma, their surface wettability was determined after 14 days from the exposure to the plasma. It was found that plasma treatment caused better wettability what reflected in a decreased contact angles measured on the modified polymer surfaces. The greatest changes appeared for polar liquids, i.e. water and formamide. It pointed to an increased the surface hydrophilicity after the plasma treatment. The changes correlated also with the increased polar interactions due to appearance polar groups on the surface. For the studied polymer surfaces, generally the dispersive interactions practically did not change, regardless the treatment time and plasma type. The total surface free energy values calculated for the polymers from three different approaches to interfacial interactions are similar. However, the energy values are apparent because they depend s upon the kind of liquid used for the contact angles measurement. Irrespectively of the plasma type, for all polymers an increase of the adhesion work of water in reference to the unmodified surfaces was observed. The most appropriate time to improve the adhesion between the polymer surface and liquid was found to be 25 or 60 s. However, the effects of plasma treatment are not permanent. With the storage time the contact angles have increased. This can be due to the structure reorganization within a few nm thick the surface layer.
Źródło:
Wiadomości Chemiczne; 2021, 75, 9-10; 1270-1295
0043-5104
2300-0295
Pojawia się w:
Wiadomości Chemiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 20

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