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L. Moshinsky




Curing of epoxy-amine systems. The topological model of linear polyaddition


Polimery 1998, No 11-12, 696


DOI: dx.doi.org/10.14314/polimery.1998.696


Summary

Linear polyaddition of an abstract diepoxide compound to a primary diamine was simulated as an isolated stage by using a topological statistics method. The molecular weight distribution of oligomers (mol %) was established for a contemplated polymerizing system as a function of the degree of conversion (Z) in an impulse reaction (Table 4). The distribution of molecular weights of the molecular products was found to be related to two monomers and 12 homo- and hetero-functional oligomers (Table 5). The remaining possible oligomers are products of the reactions proceeding with yields lower than 1‰. The data obtained were used to evaluate the distribution of molecular weigths and the properties of a constructive (real) system composed of diglicydyl ether of bisphenol A and hexamethylenediamine (Table 6). The functional composition of the resulting oligomers and some physicochemical properties data (density, viscosity, refractive index; Table 7) were calculated. When averaged, these data allowed to calculate the properties of the polymerizing system in relation to a dynamic parameter, viz ., the degree of conversion of epoxide groups (a). Some properties of the reacting system calculated by the statistical topology method were found to be linearny related to a (Fig. 1); other properties were nonlinearly related (Fig. 2).


Keywords: curing of epoxy-amine systems, topological model of linear polyaddition


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