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Citation: HE Yi-Yong, LUO Xiao-Lie, CUI Bian-Xiao, CHEN Li-Zhi, MA De-Zhu. Formation of β-Crystal Phase in Polypropylene with Different Molecular Weight[J]. Chinese Journal of Applied Chemistry, ;2001, 18(2): 112-115. shu

Formation of β-Crystal Phase in Polypropylene with Different Molecular Weight

1.
Department of Polymer Science and Engineering, China University of Science and Technology, Hefei 230026

Received Date: 10 March 2000
Available Online: 23 June 2000
Fund Project: 国家自然科学基金资助课题(29170190) (29170190)

The crystallization and melting behavior of U-crystal phase in polypropylene(U-PP) with different molecular weight have been studied by DSC and WAXD techniques. All the four U-PP samples with different molecular weight have a common optimum crystallization temperature. The crystallization rate, relative content of U-crystal phase and the crystallinity of all PP samples were found in relation with the molecular weight of the polymer. With increase in molecular weight, the crystallization rate decreases, while the relative content of U-crystal phase and the crystallinity increase.
- polypropylene,
- U-crystal phase,
- crystallization rate,
- crystal phase transformation
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