SYNDIOTACTIC SPECIFIC POLYMERIZATION OF STYRENE - DRIVING ENERGY OF THE STERIC CONTROL AND REACTION-MECHANISM

被引：112

作者：

LONGO, P ^{[1
]}

PROTO, A ^{[1
]}

ZAMBELLI, A ^{[1
]}

机构：

[1] UNIV SALERNO,DIPARTIMENTO CHIM,I-84081 BARONISSI,ITALY

来源：

MACROMOLECULAR CHEMISTRY AND PHYSICS | 1995年 / 196卷 / 09期

关键词：

D O I：

10.1002/macp.1995.021960924

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

The stereoregularity of polystyrenes prepared in the presence of different syndiotactic specific homogeneous catalysts, at different temperatures and monomer concentrations, has been evaluated by C-13 NMR. It is confirmed that the statistical model of the stereospecific propagation is first-order Markovian. The stereoregularity of the polymers decreases while increasing the polymerization temperature and is affected by the concentration of the monomer, by the ligands of the transition metal precursor of the catalyst, and is higher in the presence of titanium based catalysts. Polymerization of substituted styrenes is increasingly stereospecific in the order p-chlorostyrene < styrene < p-methylstyrene. The results strongly support the polyinsertion mechanism proposed in a previous paper by some of us.

引用

页码：3015 / 3029

页数：15

共 31 条

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