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Stereochemistry driven cocrystallisation phenomena in partially cycloaliphatic polyamides
Author(s) -
Koning Cor,
Vanhaecht Bert,
Willem Rudolph,
Biesemans Monique,
Goderis Bart,
Rimez Bart
Publication year - 2003
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.200350936
Subject(s) - polyamide , monomer , adipic acid , polymer chemistry , melting temperature , chemistry , materials science , polymer , organic chemistry , composite material
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 cis / trans ‐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.