Mechanical
properties and morphology of epoxy/poly(vinyl acetate)/poly(4-vinyl phenol)
brominated system |
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Authors: | Margarita G Prolongo C Arribas Catalina Salom Rosa M Masegosa |
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Institution: | (1) Departamento de Materiales y Producción Aeroespacial, E.T.S.I. Aeronáuticos Universidad Politécnica de Madrid, Madrid, Spain;(2) Departamento de Física y Química Aplicadas a la Técnica Aeronáutica, E.U.I.T. Aeronáutica Universidad Politécnica de Madrid, Madrid, Spain |
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Abstract: | Diglycidyl
ether of bisfenol-A (DGEBA)/poly(vinyl acetate) (PVAc)/poly(4-vinyl phenol)
brominated (PVPhBr) ternary blends cured with 4,4’-diaminodiphenylmethane
(DDM) were investigated by differential scanning calorimetry (DSC), dynamic
mechanical thermal analysis (DMTA) and scanning electron microscopy (SEM).
Homogeneous (DGEBA+DDM)/PVPhBr networks with a unique T
g
are generated. Ternary blends (DGEBA+DDM)/PVAc/PVPhBr are initially miscible
and phase separate upon curing arising two T
gs
that correspond to a PVAc-rich phase and to epoxy network phase. Increasing
the PVPhBr content the T
gof
the PVAc phase move to higher temperatures as a consequence of the PVAc-PVPhBr
interactions. Different morphologies are generated as a function of the blend
composition. |
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Keywords: | epoxy glass transition morphology poly(vinyl acetate) poly(4-vinyl phenol) brominated ternary blends |
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