EFFECT OF ORGANIC PART OF ORGANIC/INORGANIC HYBRID SUPPORT IMMOBILIZED HYBRID CATALYST ON ETHYLENE POLYMERIZATION

doi:10.3724/SP.J.1105.2011.09491

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EFFECT OF ORGANIC PART OF ORGANIC/INORGANIC HYBRID SUPPORT IMMOBILIZED HYBRID CATALYST ON ETHYLENE POLYMERIZATION

Research Article | 更新时间：2021-03-19

- EFFECT OF ORGANIC PART OF ORGANIC/INORGANIC HYBRID SUPPORT IMMOBILIZED HYBRID CATALYST ON ETHYLENE POLYMERIZATION
- Acta Polymerica Sinica Issue 1, Pages: 81-87(2011)
- 作者机构：
  
  化学工程联合国家重点实验室浙江大学化学工程与生物工程学系
- 作者简介：
- 基金信息：
- DOI：10.3724/SP.J.1105.2011.09491
  CLC：
- Published：1 January 2011，
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EFFECT OF ORGANIC PART OF ORGANIC/INORGANIC HYBRID SUPPORT IMMOBILIZED HYBRID CATALYST ON ETHYLENE POLYMERIZATION. [J]. Acta Polymerica Sinica (1):81-87(2011)
DOI：

EFFECT OF ORGANIC PART OF ORGANIC/INORGANIC HYBRID SUPPORT IMMOBILIZED HYBRID CATALYST ON ETHYLENE POLYMERIZATION. [J]. Acta Polymerica Sinica (1):81-87(2011) DOI： 10.3724/SP.J.1105.2011.09491.

摘要

采用溶胶-凝胶法

将苯乙烯-丙烯酸(P(S-co-AA))共聚物包覆在以硅胶/MgCl2为载体的TiCl3催化剂(M-1催化剂)上

负载(n-BuCp)2ZrCl2后制得TiCl3/(n-BuCp)2ZrCl2复合催化剂

研究聚合物载体P(S-co-AA)在复合催化剂乙烯聚合中的作用.前期实验结果表明有机载体P(S-co-AA)共聚物对助催化剂MMAO具有明显的阻隔作用.改变乙烯/1-己烯共聚合反应时间

通过扫描电镜(SEM)、红外光谱(FTIR)、示差扫描量热仪(DSC)和高温凝胶色谱仪(GPC)研究发现产物的形态、支化度、结晶度、熔融温度和分子量在聚合开始后40 min时均有明显的变化

表明

在聚合反应初期

催化剂外部的负载于有机载体P(S-co-AA)上的(n-BuCp)2ZrCl2催化剂主要参与反应

当聚合反应进行40 min后位于催化剂内部的M-1催化剂逐渐参与反应

当聚合反应进行至2 h时

M-1催化剂大量地参与反应.

Abstract

Organic/inorganic support made by poly(styrene-co-acrylic acid) P(S-co-AA) and SiO2 was prepared for immobilizing(n-BuCp)2ZrCl2/M-1 hybrid catalyst.P(S-co-AA) was first coated on industrialized M-1 catalyst(SiO2/MgCl2-TiCl3).The hybrid catalyst was achieved after immobilizing(n-BuCp)2ZrCl2 on the P(S-co-AA) layer.The barrier property of P(S-co-AA) layer to cocatalyst MMAO was observed by ethylene polymerization.The appearance of the lag phase in the kinetic curve during the first stage polymerization implied that the exterior catalyst((n-BuCp)2ZrCl2) could be activated prior to the interior catalyst(M-1).In addition

the morphology

short chain branch degree

molecular weight

molecular weight distribution and crystalline property of polymers obtained at different polymerization times were investigated by scanning electron microscopy(SEM)

Fourier transform infrared spectroscopy(FTIR)

gel permeation chromatography(GPC)

and differential scanning calorimetry(DSC)

respectively.The results showed that the polymer properties had little variance in the initial polymerization stage.However

two melting peaks gradually generated when the polymerization was conducted for 40 min.Moreover

the molecular weight

molecular weight distribution and short chain branch degree showed obvious changes after 40 min of polymerization time.All of those obvious changes of the polymer properties indicated that M-1 catalyst was gradually activated by MMAO after the polymerization were conducted for 40 min.The activated M-1 catalyst led to a decrease in the molecular weight.

关键词

复合催化剂有机/无机复合载体乙烯聚合载体破碎

Keywords

Hybrid catalystOrganic/inorganic supportEthylene polymerizationSupport fragment

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