Preparation and Properties of a Thermoplastic Partially Crystalline Polyimide in the Oriented State

Polyamido acids derived from 4,4′-bis(4-aminophenoxy)diphenyl (diamine) and 1,3-bis(3′,4-dicarboxyphenoxy)benzene dianhydride were synthesized in two amide solvents: dimethylformamide and N-methylpyrrolidone. Fibers with different extrusion ratios were obtained by the coagulation method. These fiber...

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Bibliographic Details
Published inRussian journal of applied chemistry Vol. 93; no. 1; pp. 72 - 79
Main Authors Vaganov, G. V., Didenko, A. L., Ivan’kova, E. M., Popova, E. N., Elokhovskii, V. Yu, Volkov, A. V., Yudin, V. E.
Format Journal Article
LanguageEnglish
Published Moscow Pleiades Publishing 2020
Springer Nature B.V
Subjects
Benzene
Chemistry
Chemistry and Materials Science
Chemistry/Food Science
Coagulation
Diamines
Dianhydrides
Elongation
Extrusion
Fibers
Heat treatment
Industrial Chemistry/Chemical Engineering
Macromolecular Compounds and Polymeric Materials
Solvents
polyimide fibers
partially crystalline polyimide
porosity
mechanical properties
extrusion
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Summary:Polyamido acids derived from 4,4′-bis(4-aminophenoxy)diphenyl (diamine) and 1,3-bis(3′,4-dicarboxyphenoxy)benzene dianhydride were synthesized in two amide solvents: dimethylformamide and N-methylpyrrolidone. Fibers with different extrusion ratios were obtained by the coagulation method. These fibers were converted to polyimide fibers by heat treatment. The influence of the solvent used in the polyamido acid synthesis and of the extrusion ratio on the structure and properties of polyimide fibers was examined. An increase in the extrusion ratio from 1 to 2 leads to an increase in the strength and elongation at break of the polyimide fibers.
ISSN:1070-4272
1608-3296
DOI:10.1134/S1070427220010085