The Effect of the C/N Mixed External Donors on the Microstructure of Polypropylene Prepared by Ziegler-Natta Catalyst

Qiang HUANG; He-fei CHANG; Shang-tao CHEN; Liao-yun ZHANG; Wei-huan HUANG; Hua-yi LI

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The Effect of the C/N Mixed External Donors on the Microstructure of Polypropylene Prepared by Ziegler-Natta Catalyst

更新时间：2022-09-18

- The Effect of the C/N Mixed External Donors on the Microstructure of Polypropylene Prepared by Ziegler-Natta Catalyst
- Polymer Bulletin Vol. 25, Issue 11, Pages: 63-68(2012)
- 作者机构：
  
  1.中国石油天然气股份有限公司石油化工研究院，北京　100195
  2.中国科学院研究生院，北京　100049
  3.中国科学院化学研究所，北京　100190
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published：2012-11，
  
  Received：20 July 2012，
  
  Revised：15 August 2012，
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Qiang HUANG, He-fei CHANG, Shang-tao CHEN, Liao-yun ZHANG, Wei-huan HUANG, Hua-yi LI. The Effect of the C/N Mixed External Donors on the Microstructure of Polypropylene Prepared by Ziegler-Natta Catalyst. [J]. Polymer Bulletin 25(11):63-68(2012)
DOI：

Qiang HUANG, He-fei CHANG, Shang-tao CHEN, Liao-yun ZHANG, Wei-huan HUANG, Hua-yi LI. The Effect of the C/N Mixed External Donors on the Microstructure of Polypropylene Prepared by Ziegler-Natta Catalyst. [J]. Polymer Bulletin 25(11):63-68(2012) DOI：

摘要

利用SSA和

C-NMR技术研究了Donor-C和Donor-N复配的外给电子体(C/N型复合外给电子体)对聚丙烯的热性能及分子链中的等规序列长度的影响。研究发现

在丙烯聚合中加入C/N型复合外给电子体不仅可以提高催化剂的催化性能

而且可以对制备的聚丙烯链的微观结构产生重要的影响。随着Donor-C在C/N型复合外给电子体中含量的升高

SSA结果表明

聚丙烯的结晶能力逐渐增强

分子链中的各等规序列长度逐渐变长;

C-NMR结果表明

分子链的平均序列长度也随着Donor-C在C/N型复合外给电子体中含量逐渐升高而增加。

Abstract

The effect of the C/N mixed external donors on the crystallization behavior and the isotactic sequence distribution of polypropylene prepared by a MgCl

-supported TiCl

Ziegler-Natta catalyst were studied through the SSA and

C-NMR techniques. When the ratio of the mixed external donors/Ti (Si/Ti) is kept in a constant

the different relative amount of the mixed external donors has an important effect on the isotactic sequence length distribution of polypropylene. The SSA results show that the crystallization ability and the relative contents of highest isotactic component gradually increase with the rise of the relative component of Donor-C in the mixed external donors

and the thickness distribution of lamellar becomes broader

indicating the isotactic sequence length distribution of polypropylene gets broader. In addition

the

C-NMR results show that the average isotactic sequence length and the average meso isotactic sequence length (MSL) of polypropylene gradually increase with the rise of the relative component of Donor-C in the mixed external donors

which shows a good correspondence between the SSA and

C-NMR techniques.

关键词

聚丙烯复合外给电子体SSA等规序列长度13C-NMR

Keywords

PolypropyleneMixed external donorsSSA13C-NMRIsotactic sequence length

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