期刊
JOURNAL OF MACROMOLECULAR SCIENCE PART B-PHYSICS
卷 54, 期 11, 页码 1376-1390出版社
TAYLOR & FRANCIS INC
DOI: 10.1080/00222348.2015.1087451
关键词
annealing; isotactic polypropylene; mechanical properties; orientation; polyolefin elastomer; beta nucleation agent
资金
- National Natural Science Foundation of China [51010004]
- State Key Laboratory of Molecular Engineering of Polymers (Fudan University)
- Sichuan Science and Technology Support Project
Blends of isotactic polypropylene (iPP)/beta nucleation agent (beta-NA)/polyolefin elastomer (POE) were prepared by injection molding. The microstructure and mechanical properties of these blends before and after being annealed at various temperatures and times were studied It was found that annealing simultaneously increased the tensile strength and impact strength. As known, the degree of orientation decreased from the skin layer to the core layer. The orientation of all layers decreased with the increase of annealing temperature and time. The results showed that annealing gave rise to chain rearrangement in both the crystalline and POE phases which, we suggest, played a crucial role in determining the mechanical properties of the blends.
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