Ontology type: schema:ScholarlyArticle
1969-01
AUTHORSE. M. Bondarenko, V. V. Rodé, V. V. Korshak
ABSTRACTConclusionsThe 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... »
PAGES56-62
http://scigraph.springernature.com/pub.10.1007/bf00907594
DOIhttp://dx.doi.org/10.1007/bf00907594
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