Relaxation processes in an aromatic polyamide-imide and composites on its basis with hydrosilicate nanoparticles

被引：11

作者：

Afanas'eva, N. V. ^{[1
]}

Gubanova, G. N. ^{[1
]}

Romashkova, K. A. ^{[1
]}

Sapegin, D. A. ^{[1
]}

Kononova, S. V. ^{[1
]}

机构：

[1] Russian Acad Sci, Inst Macromol Cpds, Bolshoi Pr 31, St Petersburg 199004, Russia

来源：

POLYMER SCIENCE SERIES A | 2016年 / 58卷 / 06期

基金：

俄罗斯基础研究基金会;

关键词：

GAS-TRANSPORT PROPERTIES; MEMBRANES; POLYIMIDES; NANOTUBES; PERVAPORATION; MORPHOLOGY; FILMS;

D O I：

10.1134/S0965545X16060018

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Features of the relaxation behavior of an aromatic polyamide-imide and a composite with nanotubes of magnesium silicate with the structure of chrysotile have been studied by dynamic mechanical analysis, dielectric spectroscopy, and differential scanning calorimetry. Two secondary relaxation (beta(1) and beta(2)) transitions have been found, the activation energies of these processes have been determined, and the solvent effect on the cooperativeness degree has been studied. Changes in the value of the apparent activation energy of the beta(1)-process caused by the subsequent heating of polymeric and composite samples have been analyzed according to the Starkweather procedure. It has been shown that, as the solvent is released from the polyamide-imide film, the polymer exhibits increasing local mobility, which are predetermined by the structure of the molecular unit. Using the GAMESS software, we have assumed the most probable dimer conformations that correspond to two repeating units of the polyamide-imide molecule.

引用

页码：956 / 967

页数：12

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