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Wyszukujesz frazę "thermal synthesis" wg kryterium: Temat


Wyświetlanie 1-13 z 13
Tytuł:
Effect of water glass modification on its viscosity and wettability of quartz grains
Autorzy:
Kmita, A.
Hutera, B.
Powiązania:
https://bibliotekanauki.pl/articles/380220.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
szkło wodne
synteza termiczna
nanocząstka ZnO
lepkość
zwilżalność
water glass
modification
thermal synthesis
ZnO nanoparticles
viscosity
wettability
Opis:
The aim of the present study was to develop a modifier for water glass. The method of thermal generation of metal oxide nanoparticles was adapted and used in the research. Nanoparticles of ZnO from the thermal decomposition of basic zinc carbonate were used. A method for the modifier introduction was developed, and the effect of modifier content and organic solvent type on the physico-chemical properties of binder (viscosity) and quartz wettability was determined. Binder viscosity was examined from the flow curves plotted with the help of a RHEOTEST 2 rotational rheometer equipped with proper software. Quartz wettability was determined examining time-related changes in the value of the contact angle in a quartz-binder system, until full stabilisation of the angle value has been achieved. Binder modification was carried out on sodium water glass designated as R"145". The water glass modifiers were suspensions of ZnO nanoparticles in propanol and methanol at a fixed concentration of c = 0.3 M and with the size of nanoparticles comprised in a range of <61 - 981 nm>. Water glass modification with the suspensions of ZnO nanoparticles in methanol and propanol showed the effect of modifier on the water glass viscosity and quartz wettability. This effect depends on the type of alcohol used. The ZnO suspension in propanol (alcohol with a longer hydrocarbon chain) affects more strongly the viscosity of binder and quartz wettability than the methanol suspension.
Źródło:
Archives of Foundry Engineering; 2012, 12, 3; 59-62
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of water glass modification with nanoparticles of zinc oxide on selected physical and chemical properties of binder and mechanical properties of sand mixture
Autorzy:
Kmita, A.
Hutera, B.
Olejnik, E.
Janas, A.
Powiązania:
https://bibliotekanauki.pl/articles/381352.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
thermal synthesis
ZnO nanoparticles
wettability
tensile strength
moulding sand
synteza termiczna
nanocząsteczki ZnO
wytrzymałość na rozciąganie
masa formierska
Opis:
In this paper, an attempt was made to use the ZnO nanoparticles as a modifier of foundry binder - water glass. The modifier was a colloidal suspension of the ZnO zinc oxide nanoparticles in propanol. A thermal method to obtain metal oxide nanoparticles was adopted. The modifier was product of the thermal decomposition of the basic zinc carbonate ([ZnCO3]2•[Zn(OH)2]3), and was introduced into the water glass in an amount of 1 and 3 wt%. To determine the interfacial reactions taking place in a quartz - modified water glass system, the binder wettability of the quartz grains was measured. The effect of water glass modification on the mechanical properties of moulding sands was verified by testing the tensile strength Rmu of moulding sands with the modified binders. Water glass modification with the colloidal solution of ZnO nanoparticles in propanol confirmed the effect of modifier on the water glass wettability of sand grains and on the mechanical properties of the sand mixtures with this additive.
Źródło:
Archives of Foundry Engineering; 2012, 12, 2s; 37-40
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ modyfikacji szkła wodnego na jego lepkość i zwilżalność osnowy kwarcowej
Influence of modification a water glass on its viscosity and wettability of the sand matrix
Autorzy:
Kmita, A.
Hutera, B.
Powiązania:
https://bibliotekanauki.pl/articles/379931.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
szkło wodne
synteza termiczna
nanocząstka ZnO
lepkość spoiwa
zwilżalność spoiwa
water glass
thermal synthesis
ZnO nanoparticle
sand matrix viscosity
sand matrix wettability
Opis:
Przedmiotem pracy jest opracowanie modyfikatora szkła wodnego. Do badań zaadaptowano termiczną metodę wytwarzania nanocząstek tlenku metalu. Wykorzystano nanocząstki ZnO pochodzące z rozpadu termicznego. Opracowany został sposób wprowadzenia modyfikatora oraz wpływ jego ilości, rodzaju organicznego rozpuszczalnika na właściwości fizykochemiczne spoiwa tj. lepkości i zwilżalność kwarcu. Lepkość spoiw określono wyznaczając krzywe płynięcia za pomocą reometru rotacyjnego RHEOTEST 2 z oprogramowaniem. Zwilżalność kwarcu określano badając zmiany wartości kąta zwilżania w czasie dla układu: kwarc-spoiwo, aż do stabilizacji wartości kąta. Modyfikację spoiwa przeprowadzono na szkle wodnym sodowym: R „145”. Modyfikatorami szkła wodnego były: zawiesiny nanocząstek ZnO w propanolu i metanolu ostałym stężeniu c=0,3 M i wielkości nanocząstek w przedziale <61–981 nm>. Modyfikacja szkła wodnego zawiesinami nanocząstek ZnO w metanolu i propanolu wykazała wpływ modyfikatora na oddziaływanie lepkie i międzyfazowe kwarc – spoiwo. Wpływ ten zależy od rodzaju alkoholu. Zawiesina ZnO w alkoholu o dłuższym łańcuchu węglowodorowym (propanol) silniej oddziaływuje na lepkość i zwilżalność w porównaniu z zawiesiną w metanolu.
The paper is to develop a water glass modifier. The study adapted the method of thermal producing of metal oxide nanoparticles. Were used ZnO nanoparticles from thermal decomposition of basic zinc carbonate. It was developed as the introduction of the modifier and the impact of the amount, type of organic solvent on physicochemical properties such as viscosity of the binder and wettability of quartz. Determining the viscosity binders flow curves identified using a rotational rheometer RHEOTEST 2 with software. Wetting of quartz was determined examining change the value of contact angle in time for the system quartz-binder, to stabilize the value of the angle. The modification of the binder was carried out sodium water glass: R "145". Water glass modifiers were suspensions of ZnO nanoparticles in propanol and methanol, concentration of suspension 0.3 M and the size of nanoparticles in the range of <61-981 nm>. Modification of water-glass suspensions of ZnO nanoparticles in methanol and propanol showed the impact modifier to the effects of viscous and interfacial quartz - a binder. This effect depends on the type of alcohol. ZnO suspension in alcohol with a longer hydrocarbon chain (propanol) strongly influences the viscosity and wettability compared with the suspension in methanol.
Źródło:
Archives of Foundry Engineering; 2012, 12, 1s; 103-106
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A New Thermally-stable Insensitive High Explosive:N,N′-Bis(1,2,3,4-tetrazol-5-yl)-4,4′-diamino-2,2′,3,3′,5,5′,6,6′-octanitroazobenzene (BTeDAONAB)
Autorzy:
Mousavi, S.
Esmaeilpour, K.
Keshavarz, M. H.
Powiązania:
https://bibliotekanauki.pl/articles/951499.pdf
Data publikacji:
2013
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
synthesis
BTeDAONAB
sensitivity
thermal stability
high explosive
Opis:
A novel high performance explosive compound, N,N′-bis(1,2,3,4-tetrazol5-yl)-4,4′-diamino-2,2′,3,3′,5,5′,6,6′-octanitroazobenzene( BTeDAONAB), is introduced which is a thermally stable, insensitive high explosive. The presence of −NH2, −N=N− groups and the tetrazole ring simultaneously in the BTeDAONAB unit surprisingly increases its thermal stability. For the identification and characterization of BTeDAONAB, different analytical techniques have been used, including melting point, IR, 1H NMR, 13C NMR spectroscopy, elemental analysis, differential thermal analysis (DTA), thermogravimetry (TG), differential scanning calorimetry (DSC) and X-ray diffraction (XRD). The sensitivity and detonation properties of BTeDAONAB were compared with 2,4,6-triamino1,3,5-trinitrobenzene (TATB) and N,N′-bis(1,2,4-triazol-3-yl-)-4,4′-diamino2,2′,3,3′,5,5′,6,6′-octanitroazobenzene (BTDAONAB), two well-known, thermally stable, insensitive high explosives, as well as hexanitrostilbene (HNS). These studies show that BTeDAONAB has favorable thermal stability with high performance.
Źródło:
Central European Journal of Energetic Materials; 2013, 10, 4; 455-465
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cobalt-lanthanum catalyst precursors for ammonia synthesis: determination of calcination temperature and storage conditions
Autorzy:
Zybert, M.
Tarka, A.
Mierzwa, B.
Raróg-Pilecka, W.
Powiązania:
https://bibliotekanauki.pl/articles/778044.pdf
Data publikacji:
2017
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
ammonia synthesis
catalyst precursor
cobalt
lanthanum
thermal analysis
Opis:
A thermal decomposition of a cobalt-lanthanum catalyst precursor containing a mixture of cobalt and lanthanum compounds obtained by co-precipitation were studied using thermal analysis coupled with mass spectrometry (TG-MS). Studies revealed that the calcination in air at 500°C is sufficient to transform the obtained cobalt precipitate into Co3 O4 , but it leads to only partial decomposition of lanthanum precipitate. In order to obtain Co/La catalyst precursor containing La2 O3  the calcination in air at the temperature about 800°C is required. However, it is unfavorable from the point of view of textural properties of the catalyst precursor. A strong effect of storage conditions on the phase composition of the studied cobalt-lanthanum catalyst precursor, caused by the formation of lanthanum hydroxide and lanthanum carbonates from La2 O3  when contacting with air, was observed.
Źródło:
Polish Journal of Chemical Technology; 2017, 19, 2; 61-66
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of preparation methods of mixed calcium and zinc thermal stabilizers derived from dimer fatty acid and tung-oil based C22 triacid on properties of PVC
Autorzy:
Li, M.
Wang, M.
Li, S.
Huang, K.
Mao, W.
Xia, J.
Powiązania:
https://bibliotekanauki.pl/articles/778123.pdf
Data publikacji:
2017
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
poly(vinyl chloride)
mixed calcium and zinc thermal stabilizer
synthesis technology
thermal stabilization
Opis:
Calcium and zinc salts of dimer fatty acids (DFA-Ca and DFA-Zn) were synthesized using direct neutralization and metathesis technologies, respectively. The adduct of maleic anhydride and methyl eleostearate (MAME) was also converted to the corresponding zinc soap (C22TA-Zn) and calcium soap (C22TA-Ca) by the two different synthetic routes. Mixed Ca/Zn salts between DFA-Ca and DFA-Zn, and between C22TA-Zn and C22TA-Ca were used as thermal stabilizers for poly(vinyl chloride) (PVC). The PVC thermal stability was determined using Congo red test, discoloration test, torque rheological analysis and TGA. Dynamic mechanical properties were also tested. Results indicated that the DFA-Ca/DFA-Zn thermal stabilizer from direct neutralization technology was found to be superior to that of the metathesis product. The C22TA-Ca/C22TA-Zn thermal stabilizer from direct neutralization method had overall superior thermal stability, and displayed modulus and glass transition comparable to that of metathesis product. Direct neutralization method was more excellent and convenient than metathesis technology.
Źródło:
Polish Journal of Chemical Technology; 2017, 19, 2; 78-87
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis and Catalytic Properties of Iron Oxides in the Reaction of Low-Temperature Ozone Decomposition
Autorzy:
Rakitskaya, T.
Truba, A.
Ennan, A.
Baumer, V.
Volkova, V.
Powiązania:
https://bibliotekanauki.pl/articles/1030914.pdf
Data publikacji:
2018-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
iron oxides
synthesis
thermal treatment
ozone decomposition
catalytic activity
Opis:
Two sets of iron oxide samples were synthesized applying different iron(III) precursors (FeCl₃ and Fe₂(SO₄)₃) and calcination temperature (200, 300, and 500°C). The samples were characterized by powder X-ray analysis and the Fourier transform infrared spectroscopy. Depending on the synthesis conditions, samples of iron oxides with different phase composition were obtained: polyphase (α -Fe₂O₃, γ -Fe₂O₃, Fe₃O₄, and α -FeO(OH)) and monophase (γ -Fe₂O₃ or α -Fe₂O₃) ones. For the samples of homogeneous composition, it has been found that the activity of γ -Fe₂O₃ in the reaction of ozone decomposition at ozone concentration in gaseous phase of 1 mg/m³ is much higher than the activity of α -Fe₂O₃.
Źródło:
Acta Physica Polonica A; 2018, 133, 4; 1079-1083
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis and Thermal Stability of Melamine-Formaldehyde-Nitro Aniline Ion-Exchange Resin
Autorzy:
Zala, S. N.
Gondaliya, M. B.
Mahetar, J. G.
Powiązania:
https://bibliotekanauki.pl/articles/412657.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
ion exchange
resin
melamine
formaldehyde
synthesis
thermal stability
reusability
antimicrobial
Opis:
A series of resins was synthesized and analyzed for selective ion-exchange nature for some metals. Substituted aniline was reacted with formaldehyde, melamine. For the synthesis of ion-exchange resins, sulfuric acid was used as a catalyst. These resins were characterized by elemental analysis and studied antimicrobial activities. Synthesized Resin shows ion exchange capability and moderate activity against microbial. Ion exchange resin also showed reusability and stability at an elevated temperature.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 13, 2; 112-118
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis, Characterization and Thermal Diffusivity of Holmium and Praseodymium Zirconates
Autorzy:
Stopyra, M.
Niemiec, D.
Moskal, G.
Powiązania:
https://bibliotekanauki.pl/articles/352244.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
pyrochlores
synthesis
polymerized-complex method
holmium zirconate
praseodymium zirconate
thermal diffusivity
Opis:
A2B2O7 oxides with pyrochlore or defected fluorite structure are among the most promising candidates for insulation layer material in thermal barrier coatings. The present paper presents the procedure of synthesis of holmium zirconate Ho2Zr2O7 and praseodymium zirconate Pr2Zr2O7 via Polymerized-Complex Method (PCM). Thermal analysis of precursor revealed that after calcination at relatively low temperature (700°C) fine-crystalline, single-phase material is obtained. Thermal diffusivity was measured in temperature range 25-200°C, Ho2Zr2O7 exhibits lower thermal diffusivity than Pr2Zr2O7. Additionally, PrHoZr2O7 was synthesized. The powder in as-calcined condition is single-phase, but during the sintering decomposition of solid solution took place and Ho-rich phase precipitated. This material exhibited the best insulating properties among the tested ones.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 2B; 1249-1254
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Size and Morphology of Yttria Nanopowders Obtained by Solution Combustion Synthesis
Autorzy:
Gizowska, M.
Kobus, I.
Perkowski, K.
Piątek, M.
Konopka, G.
Witosławska, I.
Osuchowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/354879.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
particle size distribution
solution combustion synthesis
thermal analysis
Y2O3 nanopowder
Opis:
The work presents results of solution combustion method utilization for yttria (Y2O3) nanopowder fabrication. Experiments were carried out with four different reducing agents: urea, glycine, citric acid and malonic acid added in stoichiometric ratio. The reactions were investigated using simultaneous DSC/DTA thermal analysis. After synthesis the reaction products were calcined at temperature range of 800-1100°C and analyzed in terms of particle size, specific surface area and morphology. Best results were obtained for nanoyttria powder produced from glycine. After calcination at temperature of 1100°C the powder exhibits in a form of nanometric, globular particles of diameter <100 nm, according to SEM analysis. The dBET for thus obtained powder is 104 nm, however the powder is agglomerated as the particle size measured by dynamic light scattering analysis is 1190 nm (dV50).
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 2; 743-748
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preparation, Structure and Kinetic Analysis of the Thermal Behavior of Some Energetic Salts of 3-Hydrazino-4-amino-1,2,4-triazole
Autorzy:
Wu, J. T.
Zhang, J. G.
Sun, M.
Yin, X.
Zhang, T. L.
Powiązania:
https://bibliotekanauki.pl/articles/358073.pdf
Data publikacji:
2013
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
synthesis
crystal structure
thermal analysis
3-hydrazino-4-amino-1,2,4-triazole
energetic salts
Opis:
As a key research objective for low melting explosives and propellants, energetic salts have received worldwide attention. 3-Hydrazino-4-amino-1,2,4triazole (HATr) is an important high-nitrogen compound (73.65% N) with good stability. This paper focuses on the energetic salts which were formed between HATr and picric acid (PA) or 2,4,6-trinitroresorcinol (TNR). Single crystals of HATr·PA and HATr·TNR·H2O were grown and their crystal structures determined at low temperature. They both belong to the monoclinic system, P21/n space group. The thermal characteristics of the two target salts were investigated using DSC and TG-DTG. In addition, the non-isothermal decomposition kinetics, heats of combustion and sensitivity have also been investigated. The detonation pressures (P) and detonation velocities (D) of the salts have been calculated using the K-J equations. The results indicated that both salts have certain potential applications as gunpowder and propellant materials.
Źródło:
Central European Journal of Energetic Materials; 2013, 10, 4; 481-493
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simulation study of an auto-thermal double-membrane reactor for the simultaneous production of hydrogen and methanol: comparison of two different hydrogen redistribution strategies along the reactor
Autorzy:
Rahmani, F.
Haghighi, M.
Estifaee, P.
Rahimpour, M. R.
Powiązania:
https://bibliotekanauki.pl/articles/779084.pdf
Data publikacji:
2017
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
pure hydrogen production
methanol synthesis
auto-thermal double-membrane reactor
steady-state heterogeneous model
operation mode
Opis:
In a continuing effort to realize the simultaneous hydrogen and methanol production via the auto-thermal methanol synthesis process, the effect of two different hydrogen redistribution strategies along a double-membrane reactor has been considered. A steady-state one-dimensional heterogeneous model was developed to compare two strategies applied in the operation of the auto-thermal methanol synthesis. It was found that the counter-current configuration exhibited the better performance compared to the reactor operated in the co-current mode from both the economic and environmental points of view. This superiority is ascribed to the establishment of a more favourable temperature profile along the reactor and also more hydrogen extraction from the reaction zone. Moreover, the influence of some operating variables was investigated on the performance of the auto-thermal double-membrane reactor in the counter-current configuration. The results suggest that utilizing this configuration for pure hydrogen and methanol production could be feasible and beneficial.
Źródło:
Polish Journal of Chemical Technology; 2017, 19, 2; 115-124
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis, characterization, thermal and fire retardant properties of new homo- and block copolymers of polyacrylate and epoxy resin with cyclotriphosphazene core
Synteza, charakterystyka, właściwości termiczne i ognioodporne nowych homokopolimerów i kopolimerów blokowych poliakrylanu i żywicy epoksydowej z rdzeniem cyklotrifosfazenowym
Autorzy:
Shaban, Alaa
Al-Shukri, Salah Mahdi
Kahlaf, Hussein Ismail
Al Hanbali, Othman A.
Powiązania:
https://bibliotekanauki.pl/articles/945822.pdf
Data publikacji:
2019
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Chemii Przemysłowej
Tematy:
synthesis
cyclotriphosphazene
epoxy resin
polyacrylate
thermal stability
flame retardant
synteza
cyklotrifosfazen
żywica epoksydowa
poliakrylan
stabilność termiczna
środek zmniejszający palność
Opis:
New homo- and block copolymers composed of polyacrylate and epoxy resin with hexafunctional cyclotriphosphazene core were synthesized and characterized by FT-IR and 1H-, 13C-, and 31P- NMR. The first homopolymer, PN-polyacry was prepared from the direct condensation of 2-hydroxyethylacrylate with acyl chloride of hexakis(4-carboxyphenoxy)cyclotriphosphazene, PN-acyl. The second homopolymer, PN-Ep, was prepared in a direct reaction of catalyzed carboxyl groups of hexakis(4-carboxyphenoxy)cyclotriphosphazene PN-COOH with epoxy resin via an oxirane ring opening reaction. The block copolymer, PN-Ep/polyacry, was prepared from the partial coupling of 2-hydroxyethyl acrylate with the PN-acyl, followed by the reaction of unreacted carboxyl groups with epoxy resin. Differential scanning calorimetry (DSC) analysis of the PN-Ep/polyacry copolymer exhibited good compatibility between polyacrylate and cured epoxy resin. Thermal gravimetric analysis (TGA) revealed that the prepared polymeric systems accumulate 30–38 wt % char at elevated temperatures, compared to neat polyacrylate and cured epoxy resin, which accumulate negligible char at 700 °C. The limiting oxygen index (LOI) exhibited significant enhancement of fire retardant properties of the prepared polymeric systems. A scanning electron microscopy (SEM) morphology study revealed that PN-polyacry and PN-Ep/polyacrylate produced intumescent char residues while PN-Ep produced solid dense char with a nonporous surface.
Zsyntetyzowano nowe homopolimery i kopolimery blokowe złożone z poliakrylanu i żywicy epoksydowej z sześciofunkcyjnym rdzeniem cyklotrifosfazenu. Struktury scharakteryzowano metodami FT-IR i 1H-, 13C- oraz 31P-NMR. Pierwszy homopolimer, poliakrylan (PN), wytworzono w bezpośredniej kondensacji akrylanu 2-hydroksyetylu z chlorkiem acylu heksakis(4-karboksyfenoksy)cyklotrifosfazenu (PN-acyl). Drugi homopolimer (PN-Ep) wytworzono w katalizowanej bezpośredniej reakcji grup karboksylowych heksakis(4-karboksyfenoksy) cyklotrifosfazenu (PN-COOH) z żywicą epoksydową w wyniku otwarcia pierścienia oksiranowego. Kopolimer blokowy (PN-Ep/poliakry) otrzymano w procesie częściowego sprzęgania akrylanu 2-hydroksyetylu z PN-acylem i następnej reakcji nieprzereagowanych grup karboksylowych z żywicą epoksydową. Analiza kopolimeru PN-Ep/poliakry za pomocą różnicowego kalorymetru skaningowego (DSC) wykazała dobrą kompatybilność między poliakrylanem i utwardzoną żywicą epoksydową, a na podstawie analizy termograwimetrycznej (TGA) stwierdzono, że przygotowane układy polimerowe spalają się w podwyższonej temperaturze do karbonizatu (30—38% mas.), podczas gdy czysty poliakrylan i utwardzona żywica epoksydowa w 700 °C wytwarzają jego pomijalne ilości. Wartość granicznego wskaźnika tlenowego (LOI) wskazywała na znaczące zwiększenie ognioodporności przygotowanych układów polimerowych. Badanie morfologii przy użyciu skaningowego mikroskopu elektronowego (SEM) wykazało, że w wyniku spalania poliakrylanu PN i PN-Ep/poliakrylanu wytwarza się pozostałość pęczniejących karbonizatów, podczas gdy w procesie spalania PN-Ep wytwarzał się zwarty gęsty osad o nieporowatej powierzchni.
Źródło:
Polimery; 2019, 64, 9; 577-590
0032-2725
Pojawia się w:
Polimery
Dostawca treści:
Biblioteka Nauki
Artykuł
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