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Polyamides 4.10 and 4.12 and their Isomers

Lilian Teuwen

Ruud de Jong

Gijs Janssen

Betty Coussens

DSM Research, PO Box 18, 6160 MD Geleen, The Netherlands

A series of aliphatic 1, 4-diaminobutane based polyamides 4.y with y = 8, 9, 10 and 12 was synthesized and characterized. For comparison, some 1, 6-diaminohexane based counterparts were also studied. PA 4.12, and in particular PA 4.10, proved to have a very beneficial combination of T_m, crystallization rate and physical properties. First indications were obtained, that for a series of aliphatic polyamide isomers, containing 16 carbon atoms in the repeating unit, the melting points are related to the number of ways to make an energetically favourable chain fold upon crystallization: isomers having two possible ways of chain folding have T_ms which are 13–15 °C lower than isomers having only one possible way of chain folding upon crystallization.

High Performance Polymers, Vol. 11, No. 4, 387-394 (1999)
DOI: 10.1088/0954-0083/11/4/304


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