丙烯超临界聚合中原生晶特征

doi:10.3969/j.issn.0438-1157.2013.02.044

化工学报 ›› 2013, Vol. 64 ›› Issue (2): 730-734.DOI: 10.3969/j.issn.0438-1157.2013.02.044

• 材料化学工程与纳米技术 • 上一篇下一篇

丙烯超临界聚合中原生晶特征

邱少龙¹, 霍志宏¹, 曹堃^1,2, 笪文忠³, 王兴仁³, 徐宏斌³

1. 浙江大学化工系聚合与聚合物工程研究所,浙江杭州 310027;
2. 化学工程联合国家重点实验室(浙江大学),浙江杭州 310027;
3. 中国石化扬子石油化工有限公司研究院,江苏南京 210048

收稿日期:2012-09-06 修回日期:2012-12-04 出版日期:2013-02-05 发布日期:2013-02-05
通讯作者: 曹堃
作者简介:邱少龙(1987—),男,硕士研究生。
基金资助:
国家自然科学基金项目(20576115)。

Crystallographic behavior of nascent isotactic polypropylene produced under supercritical conditions

QIU Shaolong¹, HUO Zhihong¹, CAO Kun^1,2, DA Wenzhong³, WANG Xingren³, XU Hongbin³

1. Institute of Polymerization and Polymer Engineering, Department of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, Zhejiang, China;
2. State Key Laboratory of Chemical Engineering(Zhejiang University), Hangzhou 310027, Zhejiang, China;
3. Research Institute of Yangzi Petrochemical Co.Ltd., SINOPEC, Nanjing 210048, Jiangsu, China

Received:2012-09-06 Revised:2012-12-04 Online:2013-02-05 Published:2013-02-05
Supported by:
supported by the National Natural Science Foundation of China (20576115).

摘要/Abstract

摘要： 通过广角X射线衍射(WAXD)对由丙烯超临界聚合和传统本体淤浆法制得的等规聚丙烯原生结晶特征进行了研究,并讨论了聚合工艺、预聚温度、粒径、分子量等对原生晶特征的影响。结果表明,超临界聚合法制备的等规聚丙烯(SC-iPP)呈现出α和γ的混合晶型,而采用传统淤浆法制备的等规聚丙烯(C-iPP)只含有单一α晶型,这是因为超临界的高温高压状态,使得体系传热传质阻力较小,更有利于原生晶型的发展。此外,预聚温度、粒径、分子量等因素也对丙烯超临界聚合所制得的SC-iPP结晶特征有显著影响。

关键词: 丙烯聚合, 超临界聚合, 等规聚丙烯, 原生晶

Abstract: The materials used here were isotactic polypropylene (iPP) produced by conventional slurry polymerization and under supercritical conditions.Wide-angle X-ray diffraction (WAXD) patterns of the iPPs obtained under various conditions were recorded to analyze the nascent polymorphic form.The effects of polymerization process, pre-polymerization temperature,particle size and molecular weight of the resultant iPPs on nascent polymorphic form were investigated.The iPP produced by supercritical polymerization was the mixture of α and γ forms while the iPP produced by conventional slurry process was only in the α form, just because, in the supercritical state of high pressure and high temperature, mass and heat transfer should be faster, which would facilitate development of nascent polymorphic form. Furthermore, pre-polymerization temperature, particle size and molecular weight of obtained iPPs were found to have significant effect on nascent crystallographic behavior.

Key words: propylene polymerization, supercritical polymerization, isotactic polypropylene, nascent crystal

中图分类号:

TQ325

邱少龙, 霍志宏, 曹堃, 笪文忠, 王兴仁, 徐宏斌. 丙烯超临界聚合中原生晶特征[J]. 化工学报, 2013, 64(2): 730-734.

QIU Shaolong, HUO Zhihong, CAO Kun, DA Wenzhong, WANG Xingren, XU Hongbin. Crystallographic behavior of nascent isotactic polypropylene produced under supercritical conditions[J]. CIESC Journal, 2013, 64(2): 730-734.

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丙烯超临界聚合中原生晶特征

Crystallographic behavior of nascent isotactic polypropylene produced under supercritical conditions

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