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Vinyl‐Type Polymerization of Norbornene Dicarboxylic Acid Dialkyl Esters
Author(s) -
Shin BooGyo,
Jang MyoungSouk,
Yoon Do Yeung,
Heitz Walter
Publication year - 2004
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.200300202
Subject(s) - norbornene , polymer chemistry , alkyl , dicarboxylic acid , polymerization , materials science , thermal stability , polymer , monomer , glass transition , vinyl polymer , chemistry , organic chemistry , composite material
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.