Temat: hydrolytic resistance - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Characterization of heavy metals resistant heterotrophic bacteria from soils in the Windmill Islands region, Wilkes Land, East Antarctica
Autorzy:: Tomova, Iva
Vasileva-Tonkova, Evgenia
Stoilova-Disheva, Margarita
Powiązania:: https://bibliotekanauki.pl/articles/2051132.pdf
Data publikacji:: 2014
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: Antarctica
soil bacteria
hydrolytic enzymes
antibiotic resistance
metalresistance
Źródło:: Polish Polar Research; 2014, 4; 593-607
0138-0338
2081-8262
Pojawia się w:: Polish Polar Research
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Comparison of Hydrolytic Resistance of Polyurethanes and Poly(Urethanemethacrylate) Copolymers in Terms of their Use as Polymer Coatings in Contact with the Physiological Liquid
Autorzy:: Król, P.
Chmielarz, P.
Król, B.
Pielichowska, K.
Powiązania:: https://bibliotekanauki.pl/articles/779012.pdf
Data publikacji:: 2014
Wydawca:: Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:: coatings
polyurethane elastomers
poly(urethane-methacrylate) block copolymers
ARGET
ATRP
biomaterials
hydrolytic resistance
Opis:: PU elastomers were synthesized using MDI, PTMO, butane-1,4-diol or 2,2,3,3-tetrafiuorobutane-1,4-diol. Using the same diisocyanate and polyether reagents urethane segments were prepared, to be inserted in the poly(urethane-methacrylate) copolymers. Bromourethane or tetraphenylethane-urethane macroinitiators were used as transitional products reacting with MMA according to the ARGET ATRP. 1H and 13C NMR spectral methods, as well as DSC and TGA thermal methods, were employed to confirm chemical structures of synthesised elastomers and copolymers. To investigate the possibility of using synthesized polymers as biomaterials a research on keeping them in physiological liquid at 37°C was performed. A loss in weight and ability to sorption of water was determined and by using GPC the molecular weight changes were compared. Additionally, changes in the thermal properties of the samples after exposure in physiological liquid were documented using both the TGA and DSC methods. The studies of surface properties (confocal microscopy and SFE) of the obtained polymers were performed. The structure of the polymer chains was defined by NMR. Possible reasons of hydrolysis were discussed, stating that new copolymers are more resistant and polar biomaterials can be less interesting than elastomers.
Źródło:: Polish Journal of Chemical Technology; 2014, 16, 2; 16-26
1509-8117
1899-4741
Pojawia się w:: Polish Journal of Chemical Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Potential comparison of montmorillonite filled and unfilled epoxy methacrylate of bisphenol-C-glass/ jute/treated jute and hybrid composites
Autorzy:: Bhatt, Ritesh D.
Patel, Jignesh P.
Parsania, Parsotam H.
Powiązania:: https://bibliotekanauki.pl/articles/1193485.pdf
Data publikacji:: 2021
Wydawca:: Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:: Epoxy methacrylate
chemical resistance
composites
diffusivity
hydrolytic stability
mechanical and electrical properties
montmorillonite
Opis:: Montmorillonite filled and unfilled controls, jute/treated jute/glass/hybrid composites were prepared at room temperature for three h and under 5 MPa pressure. The composites were post cured at 150 °C for 30 min. A 40% styrene was used as a reactive diluent, and 1% methylethylketone peroxide, 1.5 % cobalt octoate, and 1.5% dimethylaniline were used as initiator and accelerator, and a promoter. Filled and unfilled composites showed good to excellent mechanical and electrical properties, excellent hydrolytic stability and chemical resistance against water acids, alkali, salt solutions; high water absorption tendency (7.9-20.5%), and longer equilibrium times (288-432h). In different environments at 30 °C observed water absorption trend is H2SO4 > HCl > NaOH > H2O > NaCl. Hybrid composites showed intermediate properties of their parent composites. MMT filled treated jute (46), and unfilled glass (48), and MMT filled glass (48) composites revealed Barcol hardness between the suggested range of 45-65 for scratch and wear resistance proof materials. The nature of the reinforcements, matrix, and filler; fiber treatment, environmental conditions, etc., had affected studied properties and water absorption behavior.
Źródło:: World Scientific News; 2021, 158; 227-246
2392-2192
Pojawia się w:: World Scientific News
Dostawca treści:: Biblioteka Nauki

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