Addition polymerization of norbornene-type monomers using neutral nickel complexes containing fluorinated aryl ligands

被引：161

作者：

Barnes, DA ^{[1
]}

Benedikt, GM ^{[1
]}

Goodall, BL ^{[1
]}

Huang, SS ^{[1
]}

Kalamarides, HA ^{[1
]}

Lenhard, S ^{[1
]}

McIntosh, LH ^{[1
]}

Selvy, KT ^{[1
]}

Shick, RA ^{[1
]}

Rhodes, LF ^{[1
]}

机构：

[1] Promerus LLC, Brecksville, OH 44141 USA

来源：

MACROMOLECULES | 2003年 / 36卷 / 08期

关键词：

D O I：

10.1021/ma030001m

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 strong Lewis acid B(C6F5)(3) was found to activate complexes of nickel toward the polymerization of norbornene-type monomers. The active species in this reaction is created by the transfer Of C6F5 from boron to nickel. As a result, a class of neutral, single-component nickel complexes was developed containing two electron-withdrawing aryl ligands that polymerize norbornene and norbornenes with functional pendant groups. Active complexes include Ni(C6F5)(2)(PPh2CH2C(O)Ph), (eta(6)-toluene)Ni(C6F5)(2), and Ni(2,4,6-tris(trifluoromethyl)phenyl)(2)(1,2-dimethoxyethane). In the case of (eta(6)-toluene)Ni(C6F5)(2), isolation and characterization of low molecular weight norbornene polymers, using ethylene, indicated that each polymer chain contained a C6F5 headgroup. This points to the initiation step as being the insertion of norbornene into the Ni-C6F5 bond. The polymer microstructure as revealed by H-1 and C-13 NMR spectrometry is entirely different from that produced using the cationic nickel catalyst, [(eta(3)-crotyl)Ni(1,4-COD)]PF6. This difference in microstructure led to improved mechanical properties for 80: 20 copolymers of norbornene and 5-triethoxysilylnorbornene.

引用

页码：2623 / 2632

页数：10

共 63 条

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