The effect of the nature of the amide solvent on the molecular characteristics of poly-(4,4′-oxydiphenylene) pyromellitimido-acid

Koton, M.M.; Kallistov, O. V.; Kudryavtsev, V. V.; Sklizkova, V. P.; Silinskaya, I. G.

doi:10.1016/0032-3950(79)90280-6

Cited by 10 publications

(2 citation statements)

References 4 publications

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“…PAA was synthesized by reaction of dianhydride R with diamine BAPB in a solution of an amide solvent, methylpyrrolidone, according to the scheme described in [12]. During the synthesis, the equimolar ratio of the reactants was strictly observed.…”

Section: Resultsmentioning

confidence: 99%

Preparation of R-BABP Polyimide Fibers via Wet Spinning of Polyamide Acid

Vaganov

Диденко

Иванькова

et al. 2020

KEM

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A polyamide acid (PAA) based on diamine 4,4'-bis (4-aminophenoxy) diphenyl and 1,3-bis (3',4-dicarboxyphenoxy) benzene dianhydride was synthesized. PAA fibers were obtained by wet spinning. Then, these fibers were converted into polyimide by thermal imidization. Dependence of the structure and properties of fibers on the die drawing and the composition of the coagulation bath was studied. It is shown that the composition of the coagulation bath has a significant effect on the morphology and mechanical properties of polyimide (PI) fibers. To obtain defect-free fibers, a coagulation bath consisting of ethylene glycol/ethanol at 50/50 vol. % was found to be optimal. An increase in the die drawing of fibers from 1 to 2 times leads to an increase in tensile strength and strain at break of the polyimide fibers.

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Section: Resultsmentioning

confidence: 99%

Preparation of R-BABP Polyimide Fibers via Wet Spinning of Polyamide Acid

Vaganov

Диденко

Иванькова

et al. 2020

KEM

View full text Add to dashboard Cite

show abstract

“…For example, the polyelectrolyte effects often experienced at low concentrations in amide solvents [45,46] were found to be due to solvent impurities [47]. Careful distillation was used to eliminate the deleterious amines, and this partially ionised the polymers through proton abstractions.…”

Section: Solution Properties Of Poly( Amic Acids)mentioning

confidence: 99%