SYNTHESIS OF ISOTACTIC POLYSTYRENE WITH MgCl2 SUPPORTED TITANIUM CATALYST AND STUDIES ON ITS MOLECULAR WEIGHT DISTRIBUTION

WANG Guocheng; FAN Zhiqiang; XU Junting

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SYNTHESIS OF ISOTACTIC POLYSTYRENE WITH MgCl2 SUPPORTED TITANIUM CATALYST AND STUDIES ON ITS MOLECULAR WEIGHT DISTRIBUTION

Research Article | 更新时间：2021-03-19

- SYNTHESIS OF ISOTACTIC POLYSTYRENE WITH MgCl2 SUPPORTED TITANIUM CATALYST AND STUDIES ON ITS MOLECULAR WEIGHT DISTRIBUTION
- Acta Polymerica Sinica Issue 4, Pages: 600-605(2005)
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- Published：20 August 2005，
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WANG Guocheng, FAN Zhiqiang, XU Junting. SYNTHESIS OF ISOTACTIC POLYSTYRENE WITH MgCl2 SUPPORTED TITANIUM CATALYST AND STUDIES ON ITS MOLECULAR WEIGHT DISTRIBUTION. [J]. Acta Polymerica Sinica (4):600-605(2005)
DOI：

WANG Guocheng, FAN Zhiqiang, XU Junting. SYNTHESIS OF ISOTACTIC POLYSTYRENE WITH MgCl2 SUPPORTED TITANIUM CATALYST AND STUDIES ON ITS MOLECULAR WEIGHT DISTRIBUTION. [J]. Acta Polymerica Sinica (4):600-605(2005) DOI：

摘要

采用球形高效负载ZieglerNatta催化体系(TiCl4-MgCl2AlR3二苯基二甲氧基硅烷(DPDMS)合成等规聚苯乙烯(iPS)

催化效率最高可达7.7×103gPS/g/Ti·h.通过多个Schulz-Flory最可几分布对产物的分子量分布曲线拟合分峰来研究iPS的分子量及分子量分布的变化

AlEt3能使产物中低分子量部分含量增加

Al(iBu)3则倾向于形成高分子量的活性中心.体系中加入氢气不仅能显著提高催化效率

而且使iPS的分子量分布显著增宽.

Abstract

The highest catalytic efficiency of styrene polymerization reached 7.7×103gPS/gTi·h by using MgCl2 supported spherical Ziegler-Natta catalyst systems(TiCl4·MgCl2／AlR3／diphenyldimethoxry silane)．13C-NMR analysis showed that the products were isotactic．The influences of polymerization conditions on molecular weight and molecular weisht distribution (MWD) were studied by fitting the GPC curves of isotactic polystyrene (iPS) with the Schulz-Flory“most probable”distributions．When triethylaluminium was used as cocatalyst．the produced iPS may have more low molecular weight fractions．iPS with narrow distribution was produced with triisobutylaluminium as cocatalyst．When molecular hydrogen was added in the system

the catalytic efficiency was increased and the MWD of iPS was strongly broadened．

关键词

等规聚苯乙烯分子量分布

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