Structure-property relationships for film-forming copoly(amide imide)s

Privalko, VP; Mudrak, CV; Privalko, EG; Usenko, AA; Pissis, P

dc.contributor.author	Privalko, VP	en
dc.contributor.author	Mudrak, CV	en
dc.contributor.author	Privalko, EG	en
dc.contributor.author	Usenko, AA	en
dc.contributor.author	Pissis, P	en
dc.date.accessioned	2014-03-01T01:19:35Z
dc.date.available	2014-03-01T01:19:35Z
dc.date.issued	2003	en
dc.identifier.issn	1042-7147	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/15587
dc.subject	Copoly(amide imide)s	en
dc.subject	Dynamic mechanical analysis	en
dc.subject	Structure-property relations	en
dc.subject	Thermogravimetric analysis (TGA)	en
dc.subject	X-ray	en
dc.subject.classification	Polymer Science	en
dc.subject.other	Acetic acid	en
dc.subject.other	Carrier concentration	en
dc.subject.other	Composition	en
dc.subject.other	Copolymers	en
dc.subject.other	Dynamic mechanical analysis	en
dc.subject.other	Evaporation	en
dc.subject.other	Thermogravimetric analysis	en
dc.subject.other	Thin films	en
dc.subject.other	X ray scattering	en
dc.subject.other	Mechanical relaxations	en
dc.subject.other	Polyamideimides	en
dc.subject.other	copolymer	en
dc.subject.other	film	en
dc.subject.other	thermogravimetry	en
dc.title	Structure-property relationships for film-forming copoly(amide imide)s	en
heal.type	journalArticle	en
heal.identifier.primary	10.1002/pat.336	en
heal.identifier.secondary	http://dx.doi.org/10.1002/pat.336	en
heal.language	English	en
heal.publicationDate	2003	en
heal.abstract	Thin films of copoly(amide imide)s (coPAIs) from dichloro-dianhydride of trimellitimide-N-acetic acid and mixtures of diphenylmethane diamine (DPA) and cardo 9,9'-bis-phenylfluorene diamine (CDA) cast from solutions in dimethylacetamide (DMAA) were characterized by wide-angle and small-angle X-ray scattering (WAXS and SAXS), dynamic mechanical thermal analysis (DMTA) (temperature interval: 293-703 K, frequency range: 1-100 Hz), and thermogravimetric analysis (TGA) (nitrogen flux, temperature interval: 303-973 K). The mean interchain spacings (WAXS) smoothly increased with the CDA/DPA molar ratio from 0.55 nm for CDA/DPA = 0/1 up to 0.60 nm for CDA/DPA = 1/0. The smooth patterns of the SAXS curves for all coPAIs were explained by the smearing-out of electron density differences between densely-packed and loosely-packed microregions of coPAIs due to the wide dispersion of their sizes. The step-like patterns of the TGA traces in the temperature intervals below and above 600 K were associated with successive weight losses due to the evaporation of residual water and of DMAA, and to the thermal degradation of diamine and dianhydride chain fragments, respectively. As could be inferred from the TGA data, the loosely-packed regions comprise about 25-35% of the total volume of studied coPAIs. The mechanical relaxations observed in all coPAIs at T-beta < T-alpha < T-alpha (DMA) were attributed to the onset of non-cooperative segment motion in loosely-packed regions, of cooperative segment motion in loosely-packed regions, and of cooperative segment motion in densely-packed regions, respectively. At constant frequency, the sub-glass relaxations were roughly composition-independent, while chain-stiffening effect was assumed to be responsible for the smooth increase of T-alpha and T-alpha, as well as of the corresponding apparent activation energies with the CDA/DPA ratio. Copyright (C) 2003 John Wiley Sons, Ltd.	en
heal.publisher	JOHN WILEY & SONS LTD	en
heal.journalName	Polymers for Advanced Technologies	en
dc.identifier.doi	10.1002/pat.336	en
dc.identifier.isi	ISI:000181488200003	en
dc.identifier.volume	14	en
dc.identifier.issue	2	en
dc.identifier.spage	96	en
dc.identifier.epage	102	en