Desenvolvimento e Caracterização de Compósitos Poliméricos à Base de Poli(Ácido Lático) e Fibras Naturais

Lemos, Alessandra Luiza de; Martins, Ricardo Martins de

doi:10.4322/polimeros.2014.047

Cited by 15 publications

(12 citation statements)

References 32 publications

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“…With respect to TPU, there are very few studies (nano‐composites exempted) about lignocellulosic composites . Publications about wood‐based TPU composites are confined to the paper by Lemos and de Martins that deals with a PLA‐based blend consisting of 30% TPU. All studies proved that the incorporation of lignocellulosic fiber is possible.…”

Section: Introductionmentioning

confidence: 99%

Wood‐based composites with thermoplastic polyurethane as matrix polymer

Diestel

Krause

2018

J of Applied Polymer Sci

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This research reports the influence of the mechanical properties of thermoplastic polyurethane (TPU) as a function of wood filler percentage. Wood flour was mixed with two different chemically based TPUs. Also, moisture content during compounding process as well as the origin of moisture (wood or TPU) were studied. All experimental designs and statistical analysis were done with the software Design Expert Version 10. Composite preparation took place in a multi‐stage process. The results showed that 70% wood filler can be incorporated in the composite manufacture. The properties of the composite were mainly influenced by the proportion of wood and TPU. Wood flour increased the density, hardness, water absorption, and tensile modulus with a decrease in impact resistance and abrasion resistance of the composite. Tensile strength exhibited a decrease up to ∼35% wood content, but an increase with further addition of wood. Moisture content had only a minor influence on the mechanical and water absorption properties despite the noted severe moisture sensitivity of TPU, which usually leads to decline in mechanical properties. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46344.

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Section: Introductionmentioning

confidence: 99%

Wood‐based composites with thermoplastic polyurethane as matrix polymer

Diestel

Krause

2018

J of Applied Polymer Sci

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“…Coupling agents as maleic anhydride, for example, can improve the matrix/fiber interaction, by modifying the fiber surface or the matrix [1][2][3][4][5][6][7][8]. When properly compounded natural fibers make good candidates to replace currently used glass fiber as reinforcing agent, in addition to that, they are abundant and renewable and can be generally considered as biodegradable and non-toxic.…”

Section: Introductionmentioning

confidence: 99%

Biocomposites reinforced with natural fibers:thermal, morphological and mechanical characterization

Lemos¹,

Pires

Albuquerque³

et al. 2017

Matéria (Rio J.)

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This study evaluates the thermal, morphological and mechanical behavior of polypropylene (PP) composite with different natural fibers. The fibers used were wood, sugarcane, bamboo, babassu, coconut and kenaf with and without coupling agent. The thermal, morphological and mechanical properties were evaluated, and a composite PP+GFPP (glass fiber) was used as reference. The interaction at the interface fiber-polymer matrix was studied by scanning electron microscopy (SEM) at the fractured surface of the composites, as expected the presence of maleic anhydride (MA) as coupling agent increasedthe interaction at the interface. The influence of natural fiber in the degree of crystallinity of the composites was evaluated by DSC analysis. The samples of PP+GFPP and PP+(PP-MA)+WF (wood flour) showed better temperature stability. PP+GF also presented superior flexural modulus. The thermal dynamic mechanical behavior was evaluated by DMA, a decrease in storage modulus with increasing temperature was observed, the PP+GF and the composite containing maleic anhydride and sugarcane fiber showed higher modulus. The natural fiber biocomposites studied, consistently presented lower flexural modulus and tensile strength than the reference composite, with and without the use of coupling agent. As expected the use of natural fibers lowered the density compared to the reference material.

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“…No entanto, essa realidade tem mudado drasticamente nas últimas décadas, havendo a busca pela substituição das fibras sintéticas por fibras naturais, sendo essa busca impulsionada por fatores econômicos, ambientais e sociais [1,2] . Os fatores econômicos envolvem a redução dos custos de produção de materiais compósitos, pois fibras naturais são mais baratas que fibras sintéticas, além de serem mais facilmente processáveis por apresentarem menor abrasividade que fibras de vidro e aumentam a vida útil de extrusoras e injetoras [3,4] .…”

Section: Introductionunclassified

Nanopartículas de sílica silanizada como compatibilizante em compósitos de fibras de sisal/polietileno

et al. 2017

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ResumoFoi discutida neste estudo a influência de nanopartículas de sílica na compatibilidade entre fibras de sisal e polietileno de alta densidade, utilizados na preparação de compósitos. As fibras de sisal foram tratadas quimicamente e recobertas com nanopartículas de sílica por moagem mecânica. Os compósitos foram preparados por extrusão do polietileno com diferentes quantidades de fibras. Utilizou-se diferentes técnicas de caracterização para se obter as propriedades térmicas e a morfologia das fibras de sisal e dos compósitos, a influência das fibras de sisal e da sílica na cristalinidade do polietileno e o comportamento mecânico e a absorção de água do polietileno e dos compósitos. Foi observado que a as propriedades térmicas do polietileno não são afetadas pela presença das fibras e nanopartículas. Os diferentes tratamentos químicos e a presença de sílica nas fibras de sisal resultaram em propriedades mecânicas melhoradas e foram preponderantes para a diminuição da absorção de água nos compósitos, comparados ao polietileno. Palavras-chave: compósitos, compatibilização, nanopartícula de sílica silanizada, fibras de sisal, propriedades mecânicas. AbstractIn this study, the influence of silanized silica nanoparticles on the compatibility of composites prepared with sisal fibers and high density polyethylene is discussed. The sisal fibers were chemically treated and covered with silica nanoparticles by mechanical milling. The composites were prepared by extrusion of HDPE and different amount of fibers. The morphology and thermal properties of the sisal fibers and composites, the influence of sisal fibers and silica nanoparticles on crystallinity of HDPE, the mechanical behavior and water uptake of composites were evaluated by different techniques. It was observed that thermal properties of HDPE on composites were not changed by the presence of sisal fibers and silica nanoparticles. The different chemical treatments in sisal fibers and the presence of silica nanoparticles resulted in improved mechanical properties and were preponderant to the water uptake decrease in the composites, comparing with HDPE.

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Desenvolvimento e Caracterização de Compósitos Poliméricos à Base de Poli(Ácido Lático) e Fibras Naturais

Cited by 15 publications

References 32 publications

Wood‐based composites with thermoplastic polyurethane as matrix polymer

Wood‐based composites with thermoplastic polyurethane as matrix polymer

Biocomposites reinforced with natural fibers:thermal, morphological and mechanical characterization

Nanopartículas de sílica silanizada como compatibilizante em compósitos de fibras de sisal/polietileno

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