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The polymerization kinetics of a monoamine (p-toluidine), a diamine (4,4′-diaminodiphenylmethane) or a mixture of both amines reacted with an epoxy prepolymer, diglycidylether of bisphenol A (DGEBA), was analyzed using differential scanning calorimetry. A simple mechanistic model, consisting of an epoxy–hydroxyl complex formation out of equilibrium, including the possibility that amino hydrogens react...
The Flory-Huggins theory for the free energy of mixing in isotropic phases, in conjunction with the Maier-Saupe theory for phase transition of a nematic liquid crystal, was applied to a diepoxide-diamine-liquid crystal blend in pre- and post-gel stages. The analysis was performed taking the distribution of polymeric species into account at any conversion level. In the post-gel stage, the elastic energy...
Novolak and epoxy reaction was studied by means of differential scanning calorimetry. Two reactions can take place in the mixture: one between OH groups of the novolak and epoxy groups, and the other between secondary OH groups (coming from the opening of the epoxy ring by the first reaction) and epoxy groups. Since only one peak was detected in dynamic thermograms obtained at different heating...
Cloud-point curves were determined for blends of a rubber (butadiene-acrylonitrile random copolymer terminated in non-functional groups, NFBN) and a cyanate ester (4,4 -dicyanate-1,1 -diphenylethane, CE). Measurements were made in the initial blend and in partially polycondensed blends (thermal polycyclotrimerization of the CE monomer). Cloud-point conversions and temperatures were determined for...
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