Dielectric studies of dipolar relaxation processes in nylon 11

Neagu, RM; Neagu, E; Kyritsis, A; Pissis, P

dc.contributor.author	Neagu, RM	en
dc.contributor.author	Neagu, E	en
dc.contributor.author	Kyritsis, A	en
dc.contributor.author	Pissis, P	en
dc.date.accessioned	2014-03-01T01:49:51Z
dc.date.available	2014-03-01T01:49:51Z
dc.date.issued	2000	en
dc.identifier.issn	0022-3727	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/25939
dc.subject.classification	Physics, Applied	en
dc.subject.other	PIEZOELECTRIC PROPERTIES	en
dc.subject.other	IN-SITU	en
dc.subject.other	WATER	en
dc.subject.other	TEMPERATURE	en
dc.subject.other	PYROELECTRICITY	en
dc.subject.other	POLARIZATION	en
dc.subject.other	POLYAMIDES	en
dc.subject.other	FILMS	en
dc.title	Dielectric studies of dipolar relaxation processes in nylon 11	en
heal.type	journalArticle	en
heal.language	English	en
heal.publicationDate	2000	en
heal.abstract	The dielectric properties of semicrystalline nylon 11 (mixture of gamma and alpha phase, degree of crystallinity 62%) were investigated in wide ranges of frequency and temperature by broadband dielectric relaxation spectroscopy, thermally stimulated depolarization current techniques and triangular voltage measurements. The main interest was focused on characterizing the relaxation processes in nylon 11, so measurements were, in general, limited to temperatures lower than about 100 degrees C. The secondary gamma and beta relaxations, in order of increasing temperature in isochronal measurements, the primary alpha relaxation, associated with the glass transition of the amorphous polymer, and a process at about 95 degrees C, related to a structural phase transformation from triclinic alpha phase to pseudo-hexagonal gamma phase, were observed and studied in detail. Absorption of water was found to have a significant effect on the secondary relaxations, giving, in particular, rise to splitting of the beta relaxation into two relaxations, beta(1) and beta(2) in order of decreasing temperature in isochronal measurements. The gamma relaxation is assigned to the motion of methylene sequences involving adjacent dipolar amide groups and the beta relaxation to motion of water-polymer complexes of different molecular configurations.	en
heal.publisher	IOP PUBLISHING LTD	en
heal.journalName	JOURNAL OF PHYSICS D-APPLIED PHYSICS	en
dc.identifier.isi	ISI:000088933900025	en
dc.identifier.volume	33	en
dc.identifier.issue	15	en
dc.identifier.spage	1921	en
dc.identifier.epage	1931	en