化工学报2015，Vol.66Issue(9)：3788-3794,7.DOI:10.11949/j.issn.0438-1157.20150846
长支链聚丙烯诱导 β 晶成核效应
β-Nucleation effects induced by long chain branching polypropylene
摘要
Abstract
Taking advantages of long chain branching polypropylene based on grafting vinyl polydimethylsiloxane/styrene (PP-g-VS/St) can generate β-crystal polypropylene under shear and high cooling rate condition, PP-g-VS/St was used as a polymeric β-nucleating agent for isotactic polypropylene (iPP) under injection modeling processing and its effects on the crystallization temperature, crystal structure and mechanical properties of iPP were investigated. The results indicated that the crystallization temperature, β-crystal relative content and mechanical properties of modified iPP were improved as increasing the content of PP-g-VS/St. The crystallization temperature of modified iPP with 50% (mass) PP-g-VS/St increased by 10℃ compared with that of virgin iPP and the β-crystal relative content reached 32.8%. The impact strength, flexural modulus and tensile strength were enhanced by 355.3%, 53.8% and 15.9%, respectively, compared with those of virgin iPP. These results may provide a new method to design polymeric β-nucleating agent for iPP.关键词
β晶/成核剂/长支链聚丙烯/力学性能Key words
β-crystal/nucleating agent/long chain branching polypropylene/mechanical properties分类
化学化工引用本文复制引用
周帅,辛忠,王卫霞,赵世成,石尧麒..长支链聚丙烯诱导 β 晶成核效应[J].化工学报,2015,66(9):3788-3794,7.基金项目
国家自然科学基金项目(21476085,21306047) （21476085,21306047）
中央高校基本科研业务费专项资金(22A201514016,222201314051).supported by the National Natural Science Foundation of China(21476085, 21306047)and the Fundamental Research Funds for the Central Universities of Ministry of Education of China (22A201514016, 222201314051). （22A201514016,222201314051）
