COPOLYMERIZATION OF ETHYLENE AND PROPENE WITH MONOTITANOCENE/ METHYLALUMINOXANE AS CATALYST

ZHU Fangming; YANG Yijia; LIN Shang'an

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COPOLYMERIZATION OF ETHYLENE AND PROPENE WITH MONOTITANOCENE/ METHYLALUMINOXANE AS CATALYST

Research Article | 更新时间：2021-03-19

- COPOLYMERIZATION OF ETHYLENE AND PROPENE WITH MONOTITANOCENE/ METHYLALUMINOXANE AS CATALYST
- Acta Polymerica Sinica Issue 3, Pages: 413-416(2005)
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- Published：20 June 2005，
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ZHU Fangming, YANG Yijia, LIN Shang'an. COPOLYMERIZATION OF ETHYLENE AND PROPENE WITH MONOTITANOCENE/ METHYLALUMINOXANE AS CATALYST. [J]. Acta Polymerica Sinica (3):413-416(2005)
DOI：

ZHU Fangming, YANG Yijia, LIN Shang'an. COPOLYMERIZATION OF ETHYLENE AND PROPENE WITH MONOTITANOCENE/ METHYLALUMINOXANE AS CATALYST. [J]. Acta Polymerica Sinica (3):413-416(2005) DOI：

摘要

改性甲基铝氧烷(mMAO)激活五甲基茂基三氯化钛(Cp*TiCl3)催化乙烯丙烯共聚合

控制两种单体的进料配比

得到单元序列分布不同的共聚物.混合单体中含有少量丙烯

共聚合活性高于相同聚合条件下乙烯均聚合的活性.用13C-NMR测定共聚物分子链的微观结构和单元序列分布

计算出单体的竞聚率;结果表明共聚物分子链中两种单体的序列分布均匀.混合单体中丙烯含量较大时

共聚物为完全无规共聚物;而当丙烯含量少时

丙烯链节或短的聚丙烯链段均匀分布于聚乙烯链段之间.共聚物经DSC分析

也证明不存在长序列的聚乙烯链段;因此

即便在进料气体中丙烯含量很少的情况下

共聚物仍然没有明显的熔融温度和结晶性.

Abstract

Ethylene and propene were homo-and copolymerized with monotitanocene catalyst composed of η5-pentametbylcyclopentadienyhrichloride titanium (Cp*TiCl3) activated by modified methylaluminoxane (mMAO)．Influences of copolymerization conditions including ethylene/propene molar ratio in the feeding

polymerization temperature and Al/Ti molar ratio on activity．propene content in copolymers and the triad and tetrad sequence distributions were investigated．The monomer reactivity ratios rE and rP(E = ethylene

P = propene) for ethylene/propene copolymerizations were estimated from the 13C-NMR spectra At high propene content in the feeding

the Cp*TiCl3/mMAO catalyst gave rise to rErP≈1 in combination with a resultant random copolymer．Whereas

at low propene content in the feeding

the eopelymer exhibits a tendency toward ahemating comonomer distribution (rErP <1)

which indicates that propene suquences are isolated in the copolymer The thermal properties of eopolymers determined by DSC are mainly dependent on the pmpene content in the copolymers．

关键词

乙烯/丙烯共聚合聚（乙烯-co-丙烯）单茂钛催化剂甲基铝氧烷（MAO）

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