Citation: Cheng-zhen Geng, Yan-ling Zhu, Guang-hui Yang, Qiang Fu, Chao-liang Zhang, Ke Wang, Tian-nan Zhou. Size Distribution and Anisotropy of the Minor Phase Droplets in Polypropylene/Ethylene-Octene Copolymer Blends：Effects of Shear and Component Miscibility[J]. Chinese Journal of Polymer Science, ;2014, 32(1): 9-20. doi: 10.1007/s10118-014-1382-4 shu

Size Distribution and Anisotropy of the Minor Phase Droplets in Polypropylene/Ethylene-Octene Copolymer Blends：Effects of Shear and Component Miscibility

1.
College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu 610065, China
2.
State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu 610065, China

Received Date: 17 September 2013
Revised Date: 9 October 2013

Fund Project: This work was financially supported by the Special Funds for Major State Basic Research Projects of China (No. 2011CB606006).

In this work, polypropylene (PP)/octene-ethylene copolymer (POE) blends were injection-molded using the so-called dynamic packing injection technique, which imposed oscillatory shear on the gradually cooling melt during the packing solidification stage. In this way, the effect of shear on the size distribution and anisotropy of the minor phase droplets could be investigated. Besides, by using two kinds of POE with different octene contents, the effect of component miscibility was also studied. The results show that the droplet size is mainly determined by composition and miscibility, and droplet anisotropy is mainly determined by droplet size and shear. Most importantly, under the same processing condition, droplet anisotropy increases with droplet size, and there seems a linear fit between them, disregarding the miscibility factor. These results may provide guidance for preparing polymer blends with desired properties by tailoring their phase morphologies.
- Shear,
- Miscibility,
- Size distribution,
- Anisotropy,
- Phase morphology
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