长支链聚丙烯诱导β晶成核效应

doi:10.11949/j.issn.0438-1157.20150846

化工学报 ›› 2015, Vol. 66 ›› Issue (9): 3788-3794.DOI: 10.11949/j.issn.0438-1157.20150846

• 材料化学工程与纳米技术 • 上一篇下一篇

长支链聚丙烯诱导β晶成核效应

周帅¹, 辛忠^1,2, 王卫霞¹, 赵世成¹, 石尧麒³

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

收稿日期:2015-06-08 修回日期:2015-06-15 出版日期:2015-09-05 发布日期:2015-09-05
通讯作者: 辛忠
基金资助:
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)。

β-Nucleation effects induced by long chain branching polypropylene

ZHOU Shuai¹, XIN Zhong^1,2, WANG Weixia¹, ZHAO Shicheng¹, SHI Yaoqi³

1 State Key Laboratory of Chemical Engineering, School of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China;
2 Shanghai Key Laboratory of Multiphase Materials Chemical Engineering, School of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China;
3 Shanghai Key Laboratory of Catalysis Technology for Polyolefins, Shanghai Research Institute of Chemical Industry, Shanghai 200062, China

Received:2015-06-08 Revised:2015-06-15 Online:2015-09-05 Published:2015-09-05
Supported by:
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).

摘要/Abstract

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。

关键词: β晶, 成核剂, 长支链聚丙烯, 力学性能

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.

Key words: β-crystal, nucleating agent, long chain branching polypropylene, mechanical properties

中图分类号:

TQ316.6

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.

ZHOU Shuai, XIN Zhong, WANG Weixia, ZHAO Shicheng, SHI Yaoqi. β-Nucleation effects induced by long chain branching polypropylene[J]. CIESC Journal, 2015, 66(9): 3788-3794.

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长支链聚丙烯诱导β晶成核效应

β-Nucleation effects induced by long chain branching polypropylene

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