Internal antiplasticization in diglycidyl ether of bisphenol A diamino diphenyl methane non-stoichiometric epoxy networks

DGEBA‐DDM (diglycicyl ether of bisphenol‐A‐diamino diphenyl methane) networks of various epoxide/amine molar ratios ranging from 0.7 to 1.4, were studied by density, quasi static (10−4 s−1), and ultrasonic (5 106 s−1) modulus, and thermostimulated creep measurements. Any step aside stoichiometry lea...

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Bibliographic Details
Published in:Polymer engineering and science 1990-03, Vol.30 (6), p.321-325
Main Authors: Bellenger, V., Dhaoui, W., Verdu, J., Boye, J., Lacabanne, C.
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Miscellaneous
Physical properties
Polymer industry, paints, wood
Properties and testing
Technology of polymers
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Summary:DGEBA‐DDM (diglycicyl ether of bisphenol‐A‐diamino diphenyl methane) networks of various epoxide/amine molar ratios ranging from 0.7 to 1.4, were studied by density, quasi static (10−4 s−1), and ultrasonic (5 106 s−1) modulus, and thermostimulated creep measurements. Any step aside stoichiometry leads to an antiplasticization, e.g. an increase of the quasi static modulus, whereas Tg decreases. The previous interpretations (based on volumetric property considerations), of this phenomenon are questionable. The only common feature of all the antiplasticized systems is an unexplained decrease of the population of macro‐molecular segments involved in beta motions.
ISSN:0032-3888
1548-2634
DOI:10.1002/pen.760300602