151 EVALUATION OF ACOUSTIC PERFORMANCE OF HEMP AND COTTON FIBER REINFORCED THERMOPLASTIC COMPOSITES

In a developing and increasing world, the increment in consumption of natural resources brings environmental problems together. The use plant raw materials has great importance construction industry, which high rate. Increasing demand to develop sustainable environmentally friendly increased fibers building (sound absorption, heat sound insulation). fact that hemp fiber does not have water production, can be grown without need for fertilizers pesticides, as well leaving rich soil structure next crop by destroying weeds ensures protection environment. From this point view, study insulation properties reinforced composites were investigated. Polypropylene was used matrix material. To compare performance fiber, cotton also utilized different constructions produced from these materials. hot-press method. It found made showed significantly higher than isolation material at specific frequencies.