Crystallographic behavior of nascent isotactic polypropylene produced under supercritical conditions

QIU Shaolong; HUO Zhihong; CAO Kun; DA Wenzhong; WANG Xingren; XU Hongbin

doi:10.3969/j.issn.0438-1157.2013.02.044

您当前的位置：

首页 >

文章列表页 >

Crystallographic behavior of nascent isotactic polypropylene produced under supercritical conditions

更新时间：2025-12-10

- Crystallographic behavior of nascent isotactic polypropylene produced under supercritical conditions
- CIESC Journal Issue 2, Pages: 730-734(2013)
- 作者机构：
  
  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
- 作者简介：
- 基金信息：
- DOI：10.3969/j.issn.0438-1157.2013.02.044
  CLC： Q325
- Online First：05 February 2013，
  
  Published：05 February 2013
- 稿件说明：
移动端阅览
QIU Shaolong, HUO Zhihong, CAO Kun, et al. Crystallographic behavior of nascent isotactic polypropylene produced under supercritical conditions[J]. CIESC Journal, 2013, (2): 730-734.
DOI：

QIU Shaolong, HUO Zhihong, CAO Kun, et al. Crystallographic behavior of nascent isotactic polypropylene produced under supercritical conditions[J]. CIESC Journal, 2013, (2): 730-734. DOI： 10.3969/j.issn.0438-1157.2013.02.044.

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。

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.

关键词

Keywords

references

Views

391

下载量

CSCD

Alert me when the article has been cited

提交

Tools

Publicity Resources

Effect of pre-contact temperature on performance of DQC spherical catalyst in propylene polymerization

Influence of shear history on morphology, microstructure and mechanical properties of micro injection molded parts

Study on dissolution kinetics of erythromycin thiocyanate

Mechanism and regulation of supercooling behavior in imidazolium-based ionic liquids

Zn-doped PdO/ZrO2 with rich oxygen vacancies for the synthesis of diphenyl carbonate from CO2 and phenol

Related Author

ZHANG Tianyi

XIA Xianzhi

LIU Yuexiang

WANG Jiajia

WANG Lixia

BIAN Ning

WANG Dongfang

WANG Yongzhen

Related Institution

Beijing Research Institute of Chemical Industry, SINOPEC

International Joint Research Laboratory for Micro-Nano Moulding Technology, Zhengzhou University

National Engineering & Research Center for Advanced Polymer Processing Technology, Zhengzhou University

⁰