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 authors describe the solvolysis of sheet-molding composites (SMC) consisting of an unsaturated polyester−styrene (UP) thermoset resin associated with glass fibers, filler (calcium carbonate), and a low profile additive (LPA) (thermoplastic poly(vinyl acetate)).
Abstract: This article describes the solvolysis of sheet-molding composites (SMC) consisting of an unsaturated polyester−styrene (UP) thermoset resin associated with glass fibers, filler (calcium carbonate), and a low-profile additive (LPA) (thermoplastic poly(vinyl acetate)). Preliminary studies have shown that glycols, diacids, and bisphenols are poor solvolytic reagents. On the contrary amino alcohols and polyamines allow much higher depolymerization yields, leading to a total digestion of the polymers. Diethylenetriamine (DETA), at boiling temperature (205 °C) was then chosen as solvolytic reagent. Pure poly(vinyl acetate) (PVAc) is readily converted to soluble products. A total dissolution of cured UP requires high yield of ester cleavage. Longer reaction times are needed with styrene content enhancing. The introduction of PVAc in the UP resin does not alter the kinetics of solvolysis of the thermoset but affects the rheological behavior in intermediate states and enhances the viscosity of the final liquid. A ...
39 citations
TL;DR: The results revealed that agitation played an important role on epoxy activation and the immobilization ratio increased with the increase of the epoxy density, and the thermal stability of the immobilized lipase was much better than that of the free one, which indicated potential applications of the incapacitated lipase.
39 citations
TL;DR: In this paper, commercial poly(vinyl alcohol-acetate) copolymers were characterized by 13 C n.m.r. spectroscopy in D 2 O at 100.6 MHz and by differential scanning calorimetric measurements.
39 citations
TL;DR: In this article, the compatibility of blends of synthetic poly(propylene carbonate) with a natural bacterial poly(3-hydroxybutyrate) (PHB) was used.
Abstract: To assess the compatibility of blends of synthetic poly(propylene carbonate) (PPC), with a natural bacterial poly(3-hydroxybutyrate) (PHB), a simple casting procedure of blend was used. poly(3-hydroxybutyrate)/poly(propylene carbonate) blends are found to be incompatible according to DSC and DMA analysis. In order to improve the compatibility and mechanical properties of PHB/PPC blends, poly(vinyl acetate) (PVAc) was added as a compatibilizer. The effects of PVAc on the thermal behavior, morphology, and mechanical properties of 70PHB/30PPC blend were investigated. The results show that the melting point and the crystallization temperature of PHB in blends decrease with the increase of PVAc content in blends, the loss factor changes from two separate peaks of 70PHB/30PPC blend to one peak of 70PHB/30PPC/12PVAc blend. It is also found that adding PVAc into 70PHB/30PPC blend can decrease the size of dispersed phase from morphology analysis. The result of tensile properties shows that PVAc can increase the tensile strength and Young’s modulus of 70PHB/30PPC blend, and both the elongation at break and the tensile toughness increase significantly with PVAc added into 70PHB/30PPC.
39 citations
Patent•
01 May 2001
TL;DR: In this paper, recurring polymeric subunits made up of vinylic and dicarboxylic monomers, such as vinyl acetate or vinyl alcohol and maleic anhydride, were disclosed.
Abstract: Biodegradable anionic polymers are disclosed which include recurring polymeric subunits preferably made up of vinylic and dicarboxylic monomers such as vinyl acetate or vinyl alcohol and maleic anhydride, itaconic anhydride or citraconic anhydride, or combinations thereof. Free radical polymerization is used in the synthesis of the polymers, which are then hydrolyzed to replace ester groups with alcohol groups. The polymers may be complexed with ions and/or mixed with fertilizers or seed to yield agriculturally useful compositions. The preferred products of the invention may be applied foliarly, to seeds, to fertilizer, or to the earth adjacent growing plants in order to enhance nutrient uptake by the plants.
39 citations