Effect of Dilution During Network Formation on Cyclization and Topological Constraints in Polyurethane Networks View Full Text


Ontology type: schema:Chapter     


Chapter Info

DATE

1988

AUTHORS

Karel Dušek , Michal Ilavský

ABSTRACT

The sol fraction and equilibrium modulus of networks, prepared from poly(oxypropylene) triols and 4,4′-diphenylmethane diisocyanate in the presence of 0–60 vol. % of xylene (diluent), were compared with theoretical predictions of the branching theory based on the spanning-tree approximation to ring formation. For dilutions ranging from 0 to 60%, the fraction of bonds lost in elastically inactive cycles increases from 2·5% to 5–7·5%, depending on the initial molar ratio of OH to NCO groups. The equilibrium modulus falls very steeply with increasing dilution, much more than would correspond to the increase of the extent of cyclization. By comparing the effect of dilution on the sol fraction, one could conclude that the theory somewhat overestimates this effect, hut the differences are within the variations of about 1%) in the conversion of the minority (isocyanate) groups. The steep decrease in modulus with dilution during network formation can be explained by a decrease in the number of permanent interchain constraints. The concept of trapped entanglement seems to be a reasonable approximation. More... »

PAGES

233-242

References to SciGraph publications

Book

TITLE

Biological and Synthetic Polymer Networks

ISBN

978-94-010-7097-3
978-94-009-1343-1

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/978-94-009-1343-1_14

DOI

http://dx.doi.org/10.1007/978-94-009-1343-1_14

DIMENSIONS

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