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Master's Dissertation
DOI
Document
Author
Full name
Gilson Silvestre Martins
Institute/School/College
Knowledge Area
Date of Defense
Published
São Carlos, 2003
Supervisor
Committee
Mattoso, Luiz Henrique Capparelli (President)
Campana Filho, Sergio Paulo
Manrich, Sati
Title in Portuguese
Preparação e caracterização de compósitos de PVC reforçados com fibras de sisal
Keywords in Portuguese
Compósitos
Poli (cloreto de vinila)
Sisal
Abstract in Portuguese
Compósitos consistindo de PVC flexível plastificado com diferentes sistemas de plastificação e reforçados com fibras de sisal, foram processados em moinho de dois rolos. Dois tipos de plastificantes foram usados, um plastificante líquido (plastificante polimérico do tipo poliéster) e um plastificante sólido permanente (copolímero etileno/ acetato de vinilal monóxido de carbono - Elvaloy®), formando dois tipos de matrizes poliméricas. Para cada matriz formada estudou-se a influência do teor de cada plastificante, tamanho e teor das fibras de sisal nas propriedades dos compósitos. As fibras usadas foram previamente lavadas com água a 80°C por uma hora. Os compósitos, com fibras aleatoriamente distribuídas, foram caracterizados através de ensaios mecânicos, microscopia eletrônica de varredura (MEV), análise termogravimétrica (TGA) e calorimetria diferencial de varredura (DSC). Para cada uma das matrizes poliméricas estudadas, o tamanho ótimo de fibra foi de 6 mm. O uso do Elvaloy® como um plastificante sólido mostrou-se viável e promoveu um maior contato fibra-matriz nos compósitos, sendo um fator importante para a melhoria das propriedades mecânicas, principalmente para teores de plastificante acima de 40 pcr, comparado com o plastificante líquido. As análises térmicas (TGA e DSC) mostraram que a substituição do plastificante líquido pelo plastificante sólido, não afetou a estabilidade térmica tanto dos compósitos quanto das matrizes puras. Para ambas as matrizes poliméricas estudadas, ocorre o aumento do módulo elástico em função da adição de fibras de sisal, comparado com as mesmas matrizes puras
Title in English
Not available
Keywords in English
Not available
Abstract in English
Composites consisting of flexible PVC, plasticized with two different types of plasticizers and reinforced with sisal fibres were processed on a two roIl mixing miIl. Two plasticizers were used, a liquid plasticizer (polyester polymeric) and a permanent solid plasticizer (ethylene/ vinyl acetate/ carbon monoxide copolymer - Elvaloy®), to form two kinds ofpolymeric matrices. For each one ofthese matrices, the influence of plasticizers type, plasticizers load, size and quantity of sisal fibres in the composite properties was studied. The fibres were washed using water at 80°C by one hour. The composites with randomly distributed fibres were characterized by mechanical analysis, scanning electron microscopy, thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). For each one of the polymeric matrices studied, the optimal size of sisal fibre was 6mm in order to have a better reinforcement, under the conditions investigated. Solid plasticizer Elvaloy® was feasible for PVC compositions and promoted a better contact fibre-matrix of the composites, increasing mechanical properties for plasticizer quantity over 40 phr, compared to the liquid plasticizer. The thermical analysis (TGA and DSC) demonstrated that the replacement of the liquid plasticizer by the solid plasticizer, does not change the thermal behavior of the composites and unloaded polymeric matrices. For both matrices the elastic moduli is increase as the sisal fibres are added, when compared to unloaded matrices
 
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Publishing Date
2015-08-19
 
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