A Study of the Mechanical Properties of the Polyolefin Composite

• Main Authors: Shao-yuan Lu, 呂紹淵
• Other Authors: Pe-ming Hsu
• Format: Others
• Language: zh-TW
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/23705299669952377169

碩士 === 遠東技術學院 === 機械研究所 === 94 === In this research, it is to discuss the effects of the polyolefin’s composite on its mechanical and thermal properties. The polyolefin are divided into two categories；The first category is the polyethylene composite, and the second category is the polypropylene composite. The mechanical properties are obtained from tensile testing, bending testing, and impact testing, and the thermal properties are obtained from DSC and TGA. In this study, we hope to find a compounding composite with optimum molding conditions for a better tensile strength, flexure modulus, and impact strength for automobile industry. The results of mechanical properties for PE composites indicate that pure HDPE had a better tensile strength. H5 composite had a better elongation strain at break. H4 composite had a better tensile modulus. Also pure HDPE had the best flexure strength and modulus. For PP composites, pure PP had the best tensile strength and elongation strain at break. And P3 composite had the best tensile and flexure modulus. The results of thermal property of DSC for PE composites indicate that a single melting temperature and corresponding fusion heat of all composites were reduced due to the additive of POE. The results of thermal property of DSC for PP composites show that two melting temperatures implied immiscibility for PP composites. The melting temperature and corresponding fusion heat for PP material was not changed by additives. Therefore, the immiscibility PP composites resulted in their poor mechanical properties. The TGA curves indicate that the temperature range from starting cracking to burned out. For pure HDPE, the range was from 375 ℃to 500 ℃, and H1composite, the range was from 400 ℃to 500 ℃. For Pure PP, the range was form 325 ℃to 450℃, and for P1 composite, the range was from 375℃ to 500℃.