长支链聚丙烯诱导β晶成核效应  

β-Nucleation effects induced by long chain branching polypropylene

作　　者：周帅[1] 辛忠[1,2] 王卫霞[1] 赵世成[1] 石尧麒[3] 

机构地区：[1]华东理工大学化工学院化学工程联合国家重点实验室,上海200237 [2]华东理工大学化工学院上海市多相结构材料化学工程重点实验室,上海200237 [3]上海化工研究院上海市聚烯烃催化技术重点实验室,上海200062

出　　处：《化工学报》2015年第9期3788-3794,共7页CIESC Journal

基　　金：国家自然科学基金项目(21476085;21306047);中央高校基本科研业务费专项资金(22A201514016;222201314051)~~

摘　　要：利用乙烯基聚二甲基硅氧烷/苯乙烯接枝型长支链聚丙烯(PP-g-VS/St)在剪切和快速降温过程中可以诱导形成β晶聚丙烯这一优势,研究了PP-g-VS/St在注塑加工过程中作为高分子β晶成核剂对等规聚丙烯(iPP)结晶温度、晶体结构及力学性能的影响。结果表明改性聚丙烯的结晶温度、β晶相对含量和力学性能随着PP-g-VS/St添加量的增加而增加。当PP-g-VS/St的添加量为50%(质量分数)时,改性聚丙烯的结晶温度相对于纯iPP提高约10℃,β晶相对含量达32.8%,冲击强度、弯曲模量和拉伸强度分别相对于纯iPP提高了355.3%、53.8%和15.9%。这些结果为聚丙烯高分子β晶型成核剂的设计提供了新思路。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 

分 类 号：TQ316.6[化学工程—高聚物工业]