Reaction-induced phase separation in an epoxy/low molecular weight solvent system
作者： E. Soulé , M. García de la Mata , J. Borrajo , P. A. Oyanguren , M. J. Galante
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摘要: Blends based on a stoichiometric mixture of diglycidyl ether bisphenol A (DGEBA) and 2,2′-bis(4-amino-cyclohexyl)methane (ACHM) cyclohexane as low molecular weight solvent were studied. The polymerization kinetics data experimentally obtained at different temperatures (30–60°C) accurate fitted using mechanistic model. effect the over rate was analyzed. No influence presence found up to 20 wt% in sample. thermodynamic analysis Flory-Huggins model allowed determination initial miscibility binary blends containing DGEBA/cyclohexane pseudo-binary mixtures DGEBA/ACHM/cyclohexane. ACHM increases solubility. reaction-induced phase separation described conversion-composition transformation diagram. It indicates that takes place by nucleation growth (NG) mechanism. appropriate selection composition blend conditions led final materials with desired closed cell porous morphology.
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