Functionalization, compatibilization and properties of polypropylene composites with Hemp fibres

Pracellà, Mariano; Chionna, Donatella; Anguillesi, Irene; Kulinski, Zbigniew; Piórkowska, Ewa

doi:10.1016/j.compscitech.2005.12.006

Cited by 282 publications

(201 citation statements)

References 29 publications

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“…And X c of the composites also increased in comparison with PP. This can be explained by the fact that the fl ax fi bers acted as nucleating agent for PP which is in agreement with the literature [14,15] . It should be noted here that shive ratios and alkaline treatment did not make much difference on the crystallization behavior of the composites.…”

Section: Crystallization Behaviorsupporting

confidence: 91%

Characterization of polypropylene composites reinforced with flax fibers treated by mechanical and alkali methods

Ton‐That

Denault

et al. 2011

Science and Engineering of Composite Materials

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Flax is a type of natural fi ber widely used as reinforcing materials for polymer composites. The commercially available fl ax fi bers in Canada consist of a signifi cant amount of shive and other impurities, which could act as stress concentration regions to negatively affect the mechanical property of composites. In this study, the shive was manually removed from the commercial fl ax fi bers by screening and combing to obtain different shive contents from 0 to 30 wt % . By contrast, the obtained fl ax fi bers were further treated with alkaline solution. The fi bers obtained from mechanical and alkali treatment were compared on their thermal and mechanical properties. As expected, it was found that the thermal stability and mechanical properties of the fl ax reinforced polypropylene composites increased significantly with the removal of the shive content. However, the alkali treatment on fl ax fi ber did not further improve the composites properties. The possible reason was that the proper mechanical treatment (screening and combing) prior to alkaline treatment effectively loosened the fi ber bundles for better single fi ber separation in matrix and signifi cantly removed the impurities, thus the effect of alkaline treatment did not become obvious.

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Section: Crystallization Behaviorsupporting

confidence: 91%

Characterization of polypropylene composites reinforced with flax fibers treated by mechanical and alkali methods

Ton‐That

Denault

et al. 2011

Science and Engineering of Composite Materials

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“…Em alguns sistemas o grau de adesão interfacial entre os constituintes não tem mostrado efeito sobre o módulo [22,25] , enquanto que em outros aumentos têm sido observado [19,20] . Em compósitos de PP com fibras de coco preparados em câmara de mistura verificou-se um aumento de até 60% no módulo elástico pela adição de PPVTES e PPAM [20] .…”

Section: Processamento E Moldagemunclassified

Extrusão de compósitos de PP com fibras curtas de coco: efeito da temperatura e agentes de acoplamento

et al. 2010

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que os dois agentes de acoplamento melhoraram o módulo elástico, a tensão máxima e a resistência à absorção de água quando os materiais foram processados utilizando-se um perfil de temperaturas mais elevadas. A morfologia dos compósitos também ficou mais homogênea na presença dos agentes de acoplamento, especialmente naqueles processados na temperatura mais alta. Esses resultados indicam que a temperatura é uma variável fundamental no estabelecimento das interações envolvendo os processos de compatibilização. Palavras-chave: Compósitos, fibras naturais, agentes de acoplamento, extrusão, absorção de água. Extrusion of PP Composites with Short Coir Fibers: Effect of Temperature and Coupling AgentsAbstract: PP composites filled with coir short fibers were prepared in an extruder using two temperature profiles. The objective was to evaluate the compatibilizing effect of PP modified with vinylsilane and with maleic anhydride. Both coupling agents improved elastic modulus, tensile strength and water absorption resistance when the materials were processed at the highest temperature profile. The composite morphology was more homogeneous in the presence of the coupling agents, mainly in the composites processed at the highest temperatures. These results indicate that temperature is a key variable for the establishment of the interactions involved in the coupling processes. Keywords: Composites, natural fibers, coupling agent, extrusion, silane. IntroduçãoO desenvolvimento sustentável, a redução da demanda por materiais de origem fóssil e a redução da produção de resíduos são fatores que se relacionam entre si e que, bem conduzidos, podem resultar em benefícios importantes para a vida humana [1] . Nesse contexto o Brasil, na qualidade de concentrador de uma das mais ricas biodiversidades do planeta, tem um papel fundamental [2] . O crescente interesse no uso de fibras naturais na preparação de compósitos poliméricos constitui uma alternativa de obtenção de novos e interessantes materiais com menor impacto ambiental porque permite substituir parte dos polímeros obtidos a partir de material fóssil por fibras de origem agrícola, de caráter renovável e biodegradável. Além disso, muitas fibras e cargas vegetais constituem resíduos da atividade agrícola e seu aproveitamento, além de lhes prover um destino final racionalizado, pode reduzir os custos de preparação do produto final. Uma das principais aplicações dos compósitos poliméricos com fibras vegetais tem sido na indústria automobilística [3,4] , porém seu uso também tem se mostrado promissor na construção civil e na produção de artefatos de uso geral, tais como solados de calçados, pentes, utensílios domésticos e outros.O Brasil é um país que se destaca na produção de muitas fibras, tais como sisal, rami, algodão, coco e juta, porém diversas outras espécies são encontradas e cultivadas no país [5,6] . No Brasil, as fibras obtidas da casca do coco são materiais lignocelulósicos de baixo custo, que não encontram aplicação em fins alimentícios, por isso representam uma intere...

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“…Poor adhesion means that on processing of the composites the unmodified lignocellulose components show a tendency toward aggregation as a consequence of the intermolecular interactions between the filler molecules [7]. For this reason many authors have been searching for methods of chemical or physical modifications of the components [8][9][10][11]. Analysis of literature data has revealed many controversies; often the use of the same modifications of the lignocellulose component would bring different results.…”

Section: Introductionmentioning

confidence: 99%

Influence of cellulose polymorphs on the polypropylene crystallization

Borysiak

2013

J Therm Anal Calorim

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Results of the hitherto research work on alkalisation of lignocellulosic materials have been much divergent. In view of the above, the subject of this study is mercerization of cellulose from pine wood. This choice of the subject permitted observation of transformation of cellulose I to cellulose II with no participation of other components of lignocellulosic materials. According to X-ray results, during mercerization the isolated cellulose was easily (completely) transformed into cellulose II variety, while the pine wood was converted more slowly to cellulose II polymorphs. Therefore, it could be concluded that the presence of lignin and hemicelluloses in wood prevented the transformation from cellulose I to II. The main objective of this research was to establish the effect of cellulose varieties on the nucleation ability of different fillers by using differential scanning calorimetry (DSC) and polarizing microscopy. The nucleating effect of the fillers occurs only in the presence of cellulose I variety. In contrast, the presence of cellulose II variety seems to practically eliminate the nucleating effect of the fillers. Moreover, nucleation of the mercerized wood (mixture of cellulose I and II) can be also observed, but this effect is not strong. It should be emphasised that as yet no correlation has been reported between the quantitative composition of cellulose polymorphic forms (appearing not only in wood, but in cellulose isolated from wood as well) and the nucleation ability of lignocellulosic fillers.

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Functionalization, compatibilization and properties of polypropylene composites with Hemp fibres

Cited by 282 publications

References 29 publications

Characterization of polypropylene composites reinforced with flax fibers treated by mechanical and alkali methods

Characterization of polypropylene composites reinforced with flax fibers treated by mechanical and alkali methods

Extrusão de compósitos de PP com fibras curtas de coco: efeito da temperatura e agentes de acoplamento

Influence of cellulose polymorphs on the polypropylene crystallization

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