Dynamic-mechanical properties and melting points of some aliphatic and partially aromatic polyamides |
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Authors: | Mariastella Scandola Maria Pizzoli Annamaria Drusiani Carmine Garbuglio |
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Affiliation: | Centro di Studio per la Fisica delle Macromolecole del C.N.R. and Centro di Studio per la Strutturistica e Fisica Macromolecolare dell''Universita, Via Selmi 2, Bologna, Italy |
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Abstract: | Some aliphatic and partially aromatic polyamides have been prepared from hexamethylene diamine and the following dicarboxylic acids: deca-, octa-, hexa-methylenedicarboxylic, p-carboxymethylphenoxyacetic, p-carboxyethylphenoxyacetic, p-phenylenedipropionic, p-phenylenediacetic, p-carboxymethoxyphenoxyacetic, β(p-carboxymethyl)phenylpropionic.The dynamic-mechanical properties at 110 Hz have been measured between ?140° and about 200. Three relaxation processes α β and γ have been found: only the main transition α appreciably depends on chemical structure.The influences of the length of repeating unit and of in-chain substitution on melting points, crystallinity and the dynamic-mechanical α transition have been investigated. The results have been discussed in terms of chain flexibility, chain packing and intermolecular forces. |
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