Structural transformations of certain polyheteroarylenes in the process of thermal aging View Full Text


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Article Info

DATE

1969-01

AUTHORS

E. M. Bondarenko, V. V. Rodé, V. V. Korshak

ABSTRACT

ConclusionsThe processes that occur in polyheteroarylenes at temperatures preceding the beginning of weight losses were studied.When polyheteroarylenes are heated under vacuum to 200°C there is an increase in the molecular weight, associated with the process of condensation of the terminal groups. Above 200°C, structuration predominates, manifested initially in the formation of branched, and then of crosslinked structures.The principles of the formation of crosslinked structures were established for the example of poly-1,3,4-oxadiazole based on phthalidedicarboxylic acid (polymer I), and the nature of the accumulation of crosslinks was followed. It was shown that there is a limit of the content of the gel fraction.The values of the thermodynamic parameter of the polymer-solvent interaction of the fractions of polymer (I) with tetrachloroethane were measured. The dependence of the intrinsic viscosity of the polymer (I) on its molecular weight was found. More... »

PAGES

56-62

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/bf00907594

DOI

http://dx.doi.org/10.1007/bf00907594

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1022092783


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