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 morphological properties of batch copolymer latex were investigated using electron microscopy techniques and for their mechanical properties by dynamic mechanical spectroscopy (DMS), differential scanning calorimetry (DSC), and tensile strength measurements.
Abstract: Vinyl acetate/(VAc)-butyl acrylate/(BuA) copolymer latex films of various copolymer compositions were investigated for their morphological properties by electron microscopy techniques, and for their mechanical properties by dynamic mechanical spectroscopy (DMS), differential scanning calorimetry (DSC), and tensile strength measurements. Batch copolymer latex films showed domains of PBuA dispersed in PVAc matrix; the domain sizes were increased with increased BuA content. Semicontinuous latex films were homogeneous in composition. Glass transition temperatures Tg determined from DMS and DSC indicated the presence of two, low and high, transition temperatures for batch latex films. The two temperatures approached the individual homopolymers, with increased PBuA content up to 51 mol %. Semicontinuous latex films showed only one single Tg. Tensile properties of the batch copolymer films showed a higher ultimate tensile strength, higher Young's modulus, and lower percent elongation to break compared to semicontinuous latex films. These differences were found to reflect the effect of mode of monomer addition during the emulsion copolymerization process on the particle morphology, and confirmed earlier data on bulk, colloidal, and surface properties of the same copolymer latexes.
46 citations
TL;DR: In this article, a hybrid solid polymer electrolyte films comprising of polyvinyl acetate (PVAc), poly(methyl methacrylate) (PMMA), LiClO4, and propylene carbonate are prepared by solution casting technique by varying the salt concentration.
Abstract: Hybrid solid polymer electrolyte films comprising of poly(vinyl acetate) (PVAc), poly(methyl methacrylate) (PMMA), LiClO4, and propylene carbonate are prepared by solution casting technique by varying the salt concentration. In this study, PVAc/PMMA polymer blend ratio is fixed as 25:75 on the basis of conductivity and mechanical stability of the film. X-ray diffraction, Fourier transform infrared impedance, thermogravimetry/differential thermal analysis and scanning electron microscopy studies are carried out for the polymer electrolytes. The maximum ionic conductivity is found to be 4.511 × 10−4 S cm−1 at 303 K for the plasticized polymer electrolyte with 8 wt.% of LiClO4. The ionic conductivity is found to decrease with an increase of LiClO4 concentration.
46 citations
Patent•
23 Mar 1990
TL;DR: An improved mouth guard composition consisting of an ethylene/vinyl acetate copolymer and a thermoplastic polycarprolactone having a molecuar weight of 10,000-100,000 can be found in this article.
Abstract: An improved mouth guard composition comprises an ethylene/vinyl acetate copolymer and a thermoplastic polycarprolactone having a molecuar weight of 10,000-100,000, optionally with polyvinyl acetate, colorants and perfumes.
46 citations
Patent•
19 Jun 1992
TL;DR: In this paper, a process for the preparation of a catalyst which contains palladium and or compounds thereof and alkali metal compounds, and additionally cadmium compounds and/or gold compounds, on support particles which have been pressed from SiO2 or an iO2 -Al2 O3 mixture with the aid of a binder is described.
Abstract: The invention relates to a process for the preparation of a catalyst which contains palladium and/or compounds thereof and alkali metal compounds, and additionally cadmium compounds and/or gold and/or compounds thereof, on support particles which have been pressed from SiO2 or an iO2 -Al2 O3 mixture with the aid of a binder which comprises a) washing the roasted support particles with an acid which does not react with SiO2 or SiO2 -Al2 O3 mixtures, until no further cations of the binder employed during pressing of the support particles are released from the support particles; b) then impregnating the support particles with palladium, and gold or cadmium; c) then bringing the impregnated support particles into contact with a solution of a base at least until the thickness of the nobel metal shell generated in this way on the support particles no longer changes substantially; and d) then impregnating the support particles with an alkali metal compound. A shell-like distribution of the palladium and if appropriate of the gold in the support particles is generated in this manner. Furthermore, the invention relates to a catalyst prepared in this way and to its use for the preparation of vinyl acetate.
46 citations
TL;DR: It was proven that AJS membrane coatings can provide significant improvement in the corrosion resistance of titanium substrate and the biocompatibility using MC3T3-E1 osteoblast to the PVAc/HA fiber composite layer coated on Ti was significantly higher than pure titanium-substrates.
46 citations