Secondary transitions of aryl-aliphatic polyamides IV. Dynamic mechanical analysis

Citation
F. Beaume et al., Secondary transitions of aryl-aliphatic polyamides IV. Dynamic mechanical analysis, POLYMER, 41(14), 2000, pp. 5451-5459
Citations number
20
Categorie Soggetti
Organic Chemistry/Polymer Science
Journal title
POLYMER
ISSN journal
00323861 → ACNP
Volume
41
Issue
14
Year of publication
2000
Pages
5451 - 5459
Database
ISI
SICI code
0032-3861(200006)41:14<5451:STOAPI>2.0.ZU;2-M
Abstract
Dynamic mechanical analysis was performed on the aryl-aliphatic copolyamide s, based on lactam-12 sequences, a tere- or iso-phthalic moiety, and a 3,3' -dimethyldicyclohexylmethane unit in regular order, whose dielectric relaxa tion, C-13 NMR and H-2 NMR investigations are reported in the preceding pap ers of this series. It demonstrates the existence of three secondary relaxa tions, gamma, beta and omega, which occur in the temperature and frequency ranges where similar secondary relaxations are observed by dielectric relax ation. Comparison of the results obtained in the present paper with those d erived from the whole set of experiments carried out on these materials lea ds to a precise description of the local motions that are responsible for t he observed secondary relaxations. (C) 2000 Elsevier Science Ltd. All right s reserved.