Facile synthesis of tailor-made stereoblock polypropylenes via successive variation of monomer pressure

被引：11

作者：

Cai, Zhengguo ^{[1
]}

Nakayama, Yuushou ^{[1
]}

Shiono, Takeshi ^{[1
]}

机构：

[1] Hiroshima Univ, Grad Sch Engn, Dept Appl Chem, Higashihiroshima 7398527, Japan

来源：

MACROMOLECULES | 2008年 / 41卷 / 17期

关键词：

D O I：

10.1021/ma801318u

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

A novel synthetic procedure for the synthesis of precisely controlled multiblock syndiotactic-atactic stereoblock polypropylene (PP) with a living stereocontrollable polymerization of propylene using the 1-dMMAO system was investigated. All operations were performed under nitrogen gas using standard Schlenk techniques, and all solvents were dried and distilled before use. Polymerization was performed in a 100 mL glass reactor equipped with a magnetic stirrer. Molecular weight and molecular weight distribution of the polymer obtained were determined by gel permeation chromatography. The catalytic system showed high activity and gave PP with high number-average molecular weight for 4 minutes under 1.0 atm. The activity was decreased according to the decrease of the propylene pressure. The results suggest that the propylene polymerization proceeded in a living manner regardless of the propylene pressure, and the initiation efficiency was slightly dependent on the propylene concentration.

引用

页码：6596 / 6598

页数：3

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