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Stereochemistry Driven Cocrystallisation Phenomena in Partially Cycloaliphatic Polyamides

par Koning, Cor;Vanhaecht, Bert;Willem, Rudolph ;Biesemans, Monique;Goderis, Bart;Rimez, Bart
Référence Macromolecular symposia, 199, page (431-442)
Publication Publié, 2003-09

Article révisé par les pairs

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Résumé :

Two series of isomeric copolyamides were synthesised, viz. polyamides 12.6 for which the adipic acid residues were partially replaced by cis/trans-1,4-cyclohexanedicarboxylic acid (1,4-CHDA), and polyamides 4.14 for which the 1,4-diaminobutane residues were partially replaced by cisltrans-1,4-diaminocyclohexane (1,4-DACH). A careful DSC and WAXS analysis learned that only the trans isomers of both 1,4-DACH and 1,4-CHDA are incorporated into the crystalline phase. During DSC analysis, an intitial high trans content is preserved in the case of the non-isomerising 1,4-DACH, whereas the 1,4-CHDA residues gradually isomerise from a high initial trans content to a significanly lower trans content. Since these cis residues are not incorporated into the crystalline domains, the lower second heating melting points of the 1,4-CHDA-based copolyamides in comparison with 1,4-DACH-based copolyamides, having similar cycloaliphatic monomer contents, can be understood.