Study on mechanical:thermal properties of microcellular injection molded low density polyethylene and polypropylene nanocomposites

• Main Authors: Jhih-Wei Li, 李志偉
• Other Authors: Shyh-Shin Hwang
• Format: Others
• Language: zh-TW
• Online Access: http://ndltd.ncl.edu.tw/handle/81207457196091032474

碩士 === 清雲科技大學 === 機械工程研究所 === 98 === Maleated LDPE and PP were compounded in a twin-screw extruder in different montmorillonite (MMT) loadings. The LDPEgMA and PPgMA nanocomposites were then molded by conventional and microcellular injection molding process. The effect of MMT contents on the mechanical, thermal, rheological and foaming properties was investigated. The results showed that LDPEgMA and PPgMA nanocomposites (up to 9 wt. % MMT loading) have better tensile strength than their neat counterpart both on conventional and microcellular injection molding process. In addition to the mechanical properties, the Polyolfins nanocomposites also have better foaming property (i.e., cell size and cell density) than their neat counterpart. The addition of MMT also improved the thermal stability of the Polyolfins material. XRD results showed that as MMT loading is increased, so is the D-spacing of the Polyolfins nanocomposites. The addition of MMT increases the viscosity of the nanocomposites. However, the viscosity of maleated LDPE is lower than that of the neat LDPE. Shear shinning effect is observed at high shear rate both on the LDPEgMA and PPgMA nanocomposites.