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

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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 http://hdl.handle.net/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

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