Estudo do efeito da cristalinidade nas propriedades térmicas e mecânicas de compósitos de PP/PE reforçados com fibras de vidro

• Autor(a) principal: Macedo, Luiz Felipe Doria [UNESP]
• Data de Publicação: 2016
• Tipo de documento: Trabalho de conclusão de curso
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://hdl.handle.net/11449/155343; http://www.athena.biblioteca.unesp.br/exlibris/bd/capelo/2017-04-18/000882003.pdf
• topic: Materiais compostos; Propriedades mecanicas; Polímeros; Composite materials

The increasing use of commodities thermoplastics composites, as their versatility with which they can be processed and for the increasingly demanding engineering applications, has motivated the understanding of how the morphology of these matrices can be modified in favor of the improvement of the final properties of these composites. The present work consist in obtaining composites PP / PE and PP reinforced with glass fibers, using hot compression molding process, with different degrees of crystallinity and its influence on the thermal and mechanical properties. After obtaining the laminates with different crystallinities, the samples were divided into three groups, unconditioned, samples submitted to hygrothermal conditioning and those immersed in a salt bath. The unconditioned samples were evaluated by thermogravimetry, ultrasonic inspection and optical microscopy. The crystallinity degree achieved by the composite of the three groups were then evaluated by DSC and related to mechanical properties by mans of dynamic mechanical analysis (DMA) test and the elastic modulus vibration (impulse excitation)