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《Petrochemical Technology》 2007-07
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Effects of Rare Earth β Nucleating Agent on Properties of High-Impact Polypropylene

Chai Zhenzhong1,2,Guo Shaohui2,Feng Jiachun1,Zheng De3,Qian Yuying3,Huang Rui4(1.Key Laboratory of Molecular Engineering of Polymers of Ministry of Education,Department of Macromolecular Science,Fudan University,Shanghai 200433,China;2.College of Chemical Science and Engineering,China University of Petroleum-Beijing,Beijing 102249,China;3.Guangdong Winner Functional Materials Co.Ltd.,Foshan Guangdong 528521,China;4.College of Polymer Science and Engineering,Sichuan University,Chengdu Sichuan 610065,China)  
Effect of rare earth β nucleating agent(WBG) on mechanical properties and crystallization behavior of high-impact polypropylene(HIPP) was investigated by means of DSC and WAXD.WBG is an effective β-form nucleating agent in transition of HIPP crystalline form from α to β-form.When addition of WBG is 0.15%(mass fraction),relative content of β-form in the sample reaches more than 90%.Addition of WBG remarkably increases impact strength,elongation at break,rupture strength and heat distortion temperature of HIPP,but slightly decreases its elastic modulus and yield strength.Concerning non-isothermal crystallization behavior of HIPP,addition of 0.10%(mass fraction) WBG decreases crystallization rate slightly but increases initial crystallization temperature for more than 10 ℃,which shows effect of WBG in nucleation.When HIPP with WBG after experiencing multi heating-cooling cycles in processing,no obvious change of WBG content was observed,which indicated good processing stability of WBG.
【Fund】: 国家自然科学基金项目(50673021);; 国家重点基础研究发展“973”计划项目(2005CB623803);; 上海市自然科学基金资助项目(06ZR14007)
【CateGory Index】: TQ325.14
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