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Flow instabilities of epoxide prepolymers
Author(s) -
Aleman J. V.
Publication year - 1983
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.760230402
Subject(s) - materials science , prepolymer , epoxide , rigidity (electromagnetism) , shear (geology) , moduli , composite material , jump , flow (mathematics) , mechanics , polyurethane , physics , organic chemistry , chemistry , quantum mechanics , catalysis
Abstract Flow of molten epoxide prepolymer ( T g = 303 K, M̄ n 889, M̄ u / M̄ n = 1.46) shows stress jumps. A hydrodynamic explanation is forwarded, and a check of the theoretical jump is carried out, with shear viscosites and shear moduli measured at 361 K. The increase in pressure produces a decrease in volume, which increases the rigidity of the polymer, which is then reduced by relaxation of the compressed chain segments.