Premium
Rheological changes during a urethane network polymerization
Author(s) -
Lipshitz Stephen D.,
Macosko Christopher W.
Publication year - 1976
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760161205
Subject(s) - rheology , materials science , branching (polymer chemistry) , polymerization , polymer chemistry , polyol , shear rate , curing (chemistry) , isocyanate , polyurethane , viscosity , composite material , polymer science , polymer
Trifunctional poly‐ε‐caprolactone polyol was polymerized with a chain‐extended 1,6‐hexane diisocyanate, and the rheology followed by cone and plate flow. Viscosity was found to be independent of shear rate up to at least 10 2 N.s/m 2 (10 3 poise) and 30s −1 . Extent of reaction was monitored by a periodic titration for isocyanate groups. Using branching theory, viscosity was related to extent of reaction and temperature. Such relations should be useful for process models. Normal force data for the curing system are also reported.