Topic
Vinyl acetate
About: Vinyl acetate is a research topic. Over the lifetime, 15970 publications have been published within this topic receiving 162142 citations. The topic is also known as: Ethenyl acetate & Ethenyl ethanoate.
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TL;DR: In this article, the photodegradation and stabilization of a solar cell encapsulating material made from ethylene/vinyl acetate copolymer (EVA) was discussed. And the results were discussed in light of an antagonism effect that occurred because of the aforementioned combination, with the exception of the EVA compounded with a combination of the aromatic phosphate compound and hindered amine light stabilizer.
Abstract: This study concerns the photodegradation and stabilization of a solar cell encapsulating material made from ethylene/vinyl acetate copolymer (EVA). EVA was compounded with various additives in a twin-screw extruder. After that, the extruded film was cured in a hydraulic compression mold before being exposed to ultraviolet (UV) radiation at an ambient temperature for 800 h. The thermal stability of the material was also studied through the aging of the sample at 90°C for 2000 h. The tensile strength of the unstabilized EVA decreased only slightly after the thermal aging. On the other hand, the strength of the material decreased noticeably after the UV irradiation. Fourier transform infrared spectra of various EVA films revealed that there was no deacetylation occurring after the UV irradiation. However, results from the swelling test and swollen-state NMR suggested that the polymer degraded via a chain-scission mechanism. After compounding with some antioxidants, most of the EVA films scarcely degraded after the UV irradiation, with the exception of the EVA compounded with a combination of the aromatic phosphate compound (0.1 phr) and hindered amine light stabilizer (0.1 phr). The results are discussed in light of an antagonism effect that occurred because of the aforementioned combination. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2008
51 citations
TL;DR: The experimental results and kinetic study showed that citronellyl acetate synthesis catalyzed by immobilized lipase BCL followed the ternary complex mechanism with inhibition by alcohol (citronellol).
51 citations
Patent•
12 Apr 1989TL;DR: In this article, a copolymer of the following general formula (STR1) where m is 0 to 15 mole % and y is 1 to 50 mole % is provided.
Abstract: Vinyl acetate and an N-vinyl formamide are copolymerized to yield poly(vinyl acetate)-co-poly(N-vinyl formamide) which is base hydrolyzed to poly(vinyl alcohol)-co-poly(N-vinyl formamide). Two phase hydrolysis of particles of poly(vinyl alcohol)-co-poly(N-vinyl formamide) as a slurry in methanol yields particles of poly(vinyl alcohol)-co-poly(vinylamine). provided is a copolymer of the following general formula ##STR1## where m is 0 to 15 mole %. n is 50 to 99 mole %. x is 0 to 30 mole %. and y is 1 to 50 mole % .
51 citations
TL;DR: In this article, a novel chromatographic method is presented that can be used for chemical composition analysis regardless of the composition of the copolymers, regardless of their chemical composition.
Abstract: Ethylene−vinyl acetate (EVA) copolymers can be semicrystalline or amorphous materials, depending on their chemical composition. A variety of different methods were used for the analysis of the chemical composition distribution of these copolymers, which in general were time- and labor-consuming and could be applied only for a limited range of compositions. In the present work a novel chromatographic method is presented that can be used for chemical composition analysis regardless of the composition of the copolymer. High-temperature gradient HPLC has been found to be suitable for chemical composition separation of semicrystalline and amorphous EVA copolymers. In addition, separation is achieved from the respective homopolymers. We have found that gradients of 1,2,4-trichlorobenzene/cyclohexanone, decalin/cyclohexanone, and decalin/1-decanol enable the selective elution of the copolymers from silica gel at 140 °C. The EVA copolymers elute in dependence of their content of the polar vinyl acetate comonomer....
51 citations
TL;DR: A recombinant esterase from Pseudomonas fluorescens (PFE) was produced from E. coli cultures and the enantioselectivity towards a series of racemic substrates was investigated.
51 citations