Vinyl Acetate
Mostrando 13-24 de 80 artigos, teses e dissertações.
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13. Synergistic Effect of EG and Cloisite 15A on the Thermomechanical Properties and Thermal Conductivity of EVA/PCL Blend
The purpose of this study was to investigate the synergy of expanded graphite (EG) and Cloisite 15A (C15A) on the thermal conductivity and thermomechanical properties of ethylene-vinyl acetate copolymer/poly ( ɛ-caprolactone) (EVA/PCL) blend. Scanning electron microscopy (SEM) results showed that the blend had a phase separation, in which the PCL phase (app
Mat. Res.. Publicado em: 01/12/2016
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14. The Influence of Organic Medium and Supports in the Resolution of (R,S)-Menthol Catalyzed by Lipases
In this study, various commercial and native lipases, free or immobilized, were used in the enantioselective resolution of (R,S)-menthol with vinyl acetate for the preparation of menthyl acetate. Lipase from Candida rugosa (AYL) was found to be the most appropriate. When the reaction was carried out at 35 ºC, using 40 mg of AYL and a molar ratio of 1:2 (alc
J. Braz. Chem. Soc.. Publicado em: 2016-12
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15. Low Cost Simulator for Heart Surgery Training
Abstract Objective: Introduce the low-cost and easy to purchase simulator without biological material so that any institution may promote extensive cardiovascular surgery training both in a hospital setting and at home without large budgets. Methods: A transparent plastic box is placed in a wooden frame, which is held by the edges using elastic bands, with
Braz. J. Cardiovasc. Surg.. Publicado em: 2016-12
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16. Curaua fiber reinforced high-density polyethylene composites: effect of impact modifier and fiber loading
Abstract Short fibers are used in thermoplastic composites to increase their tensile and flexural resistance; however, it often decreases impact resistance. Composites with short vegetal fibers are not an exception to this behavior. The purpose of this work is to produce a vegetal fiber reinforced composite with improved tensile and impact resistance in rela
Polímeros. Publicado em: 07/06/2016
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17. Synthesis and photostabilizing performance of a polymeric HALS based on 1,2,2,6,6-pentamethylpiperidine and vinyl acetate
Polymeric hindered amine light stabilizers (polymeric HALS) have been extensively studied because they combine a high ability to protect the polymers against harmful effects of weathering with minimum physical loss. In this study a new polymeric N-methylated HALS was synthesized by the radical copolymerization of a cyclic tertiary amine with vinyl acetate (V
Polímeros. Publicado em: 04/12/2015
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18. Comparative study between poly(ethylene-co-vinyl acetate) - EVA expanded composites filled with banana fiber and wood flour
The objective of this study is to develop expanded composites of poly(ethylene-co-vinyl acetate) (EVA) filled with two vegetable reinforcements (banana fiber or wood flour) as well as to evaluate the influence of the type, size and concentration of these reinforcements on the cell growth and their morphological, mechanical, thermal and physical properties. T
Mat. Res.. Publicado em: 2014-12
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19. Efeito da adição de TIO2 nas propriedades térmicas e na cristalinidade do copolímero de etileno/acetato de vinila
We investigated the effect of adding titanium dioxide nanoparticles (TiO2) to ethylene vinyl acetate (EVA) copolymer, containing 28% vinyl acetate groups, on the crystallinity and miscibility of the copolymer. Films of EVA/TiO2 containing 0.25%-1% TiO2, relative to the total weight of EVA, were prepared from their solution. The obtained films were characteri
Quím. Nova. Publicado em: 2014-04
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20. Synthesis and characterization of copolymers from hindered amines and vinyl monomers
New copolymers from hindered amines and vinyl monomers were synthesized by radical chain polymerization. To obtain polymeric HALS, acrylamide-(1ATP) and acrylate-(4ATP) monomers, derivatives from 2,2,6,6-tetramethylpiperidine and 2,2,6,6-tetramethyl-4-piperidinol were synthesized. The radical chain polymerization of 1ATP with styrene (Sty) using 1-butanethio
Polímeros. Publicado em: 2014
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21. The effect of additives interaction on the miscibility and crystal structure of two immiscible biodegradable polymers
Poly lactic acid (PLLA) is a promising biopolymer, obtained from polymerization of lactic acid that is derived from renewable resources through fermentation. The characteristic brittleness of PLLA is attributed to slow crystallization rates, which results in the formation of the large spherulites. Its glass temperature is relative high, above room temperatur
Polímeros. Publicado em: 2014
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22. Study of hygral behavior of non-asbestos fiber cement made by similar hatschek process
Fiber cement, similarly to all cementitious materials, undergoes dimensional and volumetric changes when it is exposed to dry and wet environments. When exposed to natural weathering, cement-based materials absorbs and may also release water to their surroundings via a very complex inherent pore structure. In this work initialized a few years ago, some prope
Mat. Res.. Publicado em: 05/11/2013
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23. Pré-moldado (bloco EVAi) para alvenaria intertravada: projeto, produção, desempenho e simulação de uso em habitação social
A eficácia do projeto para habitação social requer soluções que contemplem os desempenhos técnico e ambiental. Este artigo tem como objetivo abordar os conceitos de coordenação modular e apresentar a proposta do bloco EVAi (Bloco Intertravados contendo Ethylene Vinyl Acetate), levando em consideração avaliações de desempenho mecânico e térmico
Ambient. constr.. Publicado em: 2013-06
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24. Estudo do comportamento de materiais não convencionais utilizados como revestimento de paredes, visando à redução da carga térmica.
A presente dissertação estudou o compartamento térmico, físico e mecânico das argamassas de revestimentos compostas por gesso puro, gesso/EVA (ethylene-vinyl acetate copolymer) e gesso/vermiculita aplicadas nas superficies das paredes de edificação visando à redução da carga térmica relativamente às paredes convencionais constituídas de tijolos
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 10/02/2012