Properties of polyurethane elastomers and composites by thermal analysis

Mothé, Cheila G.; Araujo, Carla R. de

doi:10.1016/s0040-6031(00)00403-2

Cited by 77 publications

(53 citation statements)

References 6 publications

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“…Polyester bamboo [132] ,banana [133,134] , coconut [69,135] , curaua [111,136] , flax [137,138] ,hemp [139][140] , jute [141][142] , pineapple [143,144] , sisal [145,146] , sugarcane bagasse [74,147] Polyurethane (PU) banana [148] , coconut [149] , curaua [108] , sisal [150,151] Epoxy banana [114,152] , coconut [153,154] , cotton [155] , flax [156][157] , hemp [158] , juta [159][160][161][162] , pineapple [163] , sisal [164][165] Phenolic banana [166,167] , flax [168,169] , jute [170] , sisal [171][172][173][174]…”

Section: Vegetal Fibersmentioning

confidence: 99%

“…The green composites that use polyurethane resin based on castor oil reinforced by sisal fibers have been studied by Milanese et al [151] ; Silva et al [202] ; Melo and Pasa [203] , with jute fibers by Neto et al [22] ; banana peel fiber by Merlini et al [148] ; sugarcane bagasse by Miléo et al [204] , and coconut fibers by Mothé and Araújo [149] . Silva et al [202] reported the hygroscopic, thermal and mechanical properties of sisal/castor oil PU composites evaluated regard to reinforcement geometry (short fiber, long fiber and woven fabric) and alkaline treatment of fibers with sodium hydroxide solution (10% wt) for 1h.…”

Section: Propertiesmentioning

confidence: 99%

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Vegetal fibers in polymeric composites: a review

et al. 2015

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RbstractThe need to develop and commercialize materials containing vegetal fibers has grown in order to reduce environmental impact and reach sustainability. Large amounts of lignocellulosic materials are generated around the world from several human activities. The lignocellulosic materials are composed of cellulose, hemicellulose, lignin, extractives and ashes. Recently these constituents have been used in different applications; in particular, cellulose has been the subject of numerous works on the development of composite materials reinforced with natural fibers. Many studies have led to composite materials reinforced with fibers to improve the mechanical, physical, and thermal properties. Furthermore, lignocellulosic materials have been treated to apply in innovative solutions for efficient and sustainable systems. This paper aims to review the lignocellulosic fibers characteristics, as well as to present their applications as reinforcement in composites of different polymeric matrices.

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Section: Vegetal Fibersmentioning

confidence: 99%

Section: Propertiesmentioning

confidence: 99%

Vegetal fibers in polymeric composites: a review

et al. 2015

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“…As fibras e as cargas minerais diminuem o movimento das cadeias poliméricas elevando o módulo de elasticidade. Além disso, a resistência à tração e o módulo de elasticidade das fibras de juta e das cargas minerais é bastante superior aos da matriz poliuretano [6,8,10,[13][14][15] .…”

Section: Resultsunclassified

“…Jayabalan e Lizymol [6] abordaram sobre a importância dos poliuretanos como biomateriais e Melo e Pasa [7] relataram que a presença de ligações éster, grupos hidroxilas e insaturações promovem sítios de reação no óleo de mamona, o que permite o preparo de derivados industriais importantes como o poliuretano. Mothe e Araújo [8] realizaram trabalhos com compósitos de poliuretano, derivado de óleo de rícino, e fibras naturais e ressaltaram a importância desses como substitutos dos derivados de petróleo. Chierice et al [9] enfatizaram que o óleo de mamona além de ser abundante no Brasil é uma matéria prima renovável e não causa agressões ao ambiente.…”

Section: Introductionunclassified

Influência da adição de uma carga nanoparticulada no desempenho de compósitos poliuretano/fibra de juta

Neto

Carvalho²,

Araújo³

2007

Polímeros

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Resumo: Neste trabalho as propriedades mecânicas de um compósito, formado a partir de uma matriz de poliuretano derivado do óleo de mamona e reforçada por um tecido tramado de juta, foram avaliadas. O efeito da adição de pequenos teores de bentonita cálcica e sódica sobre as propriedades mecânicas da matriz de poliuretano e de compósitos poliuretano/juta também foi investigado. Os resultados indicam que a incorporação de fibra de juta à matriz poliuretana promoveu melhora significativa nas propriedades sob tração dos compósitos. A adição de pequenos teores de argila à matriz alterou o desempenho mecânico dos compósitos, porém os resultados não foram os esperados. O compósito híbrido poliuretano/argila/fibra de juta, contudo, apresentou propriedades mecânicas superiores às dos compósitos reforçados unicamente com tecido de juta, o que indica uma atuação sinérgica dos reforços híbridos argila/juta. Palavras-chave:Compósito, poliuretano, fibra de juta, carga nanoparticulada. Influence of a Nanoparticulate Filler Addition on the Mechanical Properties of Polyurethane/Jute Fiber CompositesAbstract: In this work the mechanical properties of polyurethane/jute fiber composites were evaluated as a function of fiber content and mineral filler addition. A polyurethane (PU) derived from castor oil was used as the matrix and hessian cloth as reinforcement. The effect of the incorporation of small amounts of local clay (bentonite), in its calcium and sodium forms, on the mechanical properties of polyurethane/jute composites was also investigated. The results indicate that the tensile properties of the composites substantially increased with jute fiber addition and that although the mechanical properties of the matrix were affected by the addition of nanoparticulate clay, the improvement was not as expected. This was attributed to poor mixing and dispersion of the filler, which was confirmed by SEM. A synergistic effect was observed for the hybrid clay/jute fiber composites, with considerable improvement in the mechanical performance of the hybrid composites.

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“…Some of the organic materials more commonly used are carbon black 10 and natural fibers [11][12] . In flexible polyurethane foams, the fillers promote an increase in density and resistance to compression.…”

Section: Introductionmentioning

confidence: 99%

Physico-chemical analysis of flexible polyurethane foams containing commercial calcium carbonate

et al. 2008

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Calcium carbonate (CaCO 3 ) is a filler often utilized by the Brazilian mattress factories in the production of polyurethane foams. The filler allows the substitution of part of the polymeric agents, conferring dimensional stability and hardness to the foams. However, in agreement with experimental data, it is observed that the excess of commercial CaCO 3 utilized in industry causes the increase of hysteresis, possibly causing permanent deformations and damaging the quality of the final product. In the present work, the physico-chemical analyses of the flexible polyurethane foams with different contents of CaCO 3 were performed. The foams are submitted to the morphological, mechanical and positron analyses to verify the alterations provoked by the progressive introduction of this filler.

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Properties of polyurethane elastomers and composites by thermal analysis

Cited by 77 publications

References 6 publications

Vegetal fibers in polymeric composites: a review

Vegetal fibers in polymeric composites: a review

Influência da adição de uma carga nanoparticulada no desempenho de compósitos poliuretano/fibra de juta

Physico-chemical analysis of flexible polyurethane foams containing commercial calcium carbonate

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