Abstract
AbstractThe effect of 1,3‐cyclohexane rings in the chain backbone on the crystal structure of polyamides has been studied using polyamides (denoted 1,3‐CBMA‐n) obtained from 1,3‐cyclohexane‐bis(methylamine) (1,3‐CBMA) and n‐carbon dicarboxylic acids. The crystallinity of the 1,3‐CBMA‐n polymers changes greatly with variation in the value of n. This is attributed to hydrogen‐bond changes associated with the relative length of the diacid moiety to the diamine moiety in the monomeric unit of each polymer. In 1,3‐CBMA‐6, the cis‐1,3‐cyclohexane rings are readily accommodated in the molecular chains to form crystals in a manner similar to the m‐benzene rings in poly(m‐xylylene adipamide) (MXD‐6). The crystal lattice, however, is more expanded than in MXD‐6 since the 1,3‐cyclohexane rings is bulkier than the m‐benzene ring. The crystal structure of the 1,3‐CBMA‐n polymers is essentially the same as that of MXD‐6.
Published Version
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