Citation: Li Chen, Yu-fang Xiang, Ke Wang, Qin Zhang, Rong-ni Du, Qiang Fu. Effects of matrix molecular weight on structure and reinforcement of high density polyethylene/mica composites[J]. Chinese Journal of Polymer Science, ;2011, 29(3): 377-389. doi: 10.1007/s10118-011-1035-9 shu

Effects of matrix molecular weight on structure and reinforcement of high density polyethylene/mica composites

Received Date: 26 April 2010
Revised Date: 17 May 2010

Three types of high-density polyethylene (HDPE) with different molecular weights (high, medium and low) were adopted to evaluate the influence of matrix molecular weight on the structure-property relation of injection-molded HDPE/mica composites through a combination of SEM, 2d-WAXS, DSC, DMA and tensile testing. Various structural factors including orientation, filler dispersion, interfacial interaction between HDPE and mica, etc., which can impact the macroscopic mechanics, were compared in detail among the three HDPE/mica composites. The transcrystallization of HDPE on the mica surface was observed and it exhibited strong matrix molecular weight dependence. Obvious transcrystalline structure was found in the composite with low molecular weight HDPE, whereas it was hard to be detected in the composites with increased HDPE molecular weight. The best reinforcement effect in the composite with low molecular weight HDPE can be understood as mainly due to substantially improved interfacial adhesion between matrix and mica filler, which arises from the transcrystallization mechanism.
- Polyethylene/mica composite,
- Molecular weight,
- Transcrystallization
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