Nonisothermal Crystallization, Melting Behavior, and Morphology of PP/EPPE Blends

作者：Qin Jianglei^*; Li Zhiting

来源：Journal of Applied Polymer Science, 2010, 115(2): 1256-1263.

DOI：10.1002/app.29844

• polypropylene(PP)
• easy processing polyethylene (EPPE)
• melting behavior
• nonisothermal crystallization kinetics
• morphology

Nonisothermal crystallization, melting behavior, and morphology of polypropylene (PP)/Easy processing polyethylene (EPPE) blends were studied by differential scanning alorimetry (DSC) and scanning electron microscope (SEM). The results showed that PP and EPPE are miscible, and there is no obvious phase separation in microphotographs of the blends. The modified Avrami analysis, Ozawa equation, and also Mo Z.S. method were used to analyze the nonisothermal crystallization kinetics of the blends. Values of Avrami exponent indicated the crystallization nucleation of the blends is homogeneous, the growth of spherulites is tridimensional, and crystallization mechanism of PP is not affected much by EPPE. The crystallization activation energy was estimated by Kissinger method. The result obtained from modified Avrami analysis, Mo Z.S. method, and Kissinger methods were well agreed. The addition of minor EPPE phase favored to decrease the overall crystallization rate of PP, showing some dilution effect of EPPE on PP.

• 出版日期2010-1-15
• 单位河北大学