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Vinyl-Type Polymerization of Norbornene Dicarboxylic Acid Dialkyl Esters

✍ Scribed by Boo-Gyo Shin; Myoung-Souk Jang; Do Yeung Yoon; Walter Heitz

Publisher
John Wiley and Sons
Year
2004
Tongue
English
Weight
121 KB
Volume
25
Category
Article
ISSN
1022-1336

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✦ Synopsis

Abstract

Summary: Poly(cis‐norbornene‐exo‐2,3‐dicarboxylic acid dialkyl esters) (alkyl = Me, Et, Pr, Bu, Pen, and Hex) are synthesized as a vinyl‐type with a palladium(II) catalyst in high yield from easily prepared, pure exo‐monomers. The polymers show good solubility in common organic solvents and excellent thermal stability up to 330 °C. The polymers with alkyl groups larger than methyl exhibit a two‐step thermal degradation profile of an initial thermal degradation of side‐chains starting at 350 °C, followed by thermal degradation of the norbornene backbone starting at ca. 430 °C. The glass transition temperature decreases and the mechanical flexibility increases as the alkyl length of the side‐chain increases.

Normalized loss shear modulus (G″) versus temperature for polynorbornene dicarboxylic acid dialkyl esters.

imageNormalized loss shear modulus (G″) versus temperature for polynorbornene dicarboxylic acid dialkyl esters.

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