Abstract
In highly concentrated solutions (40 to 70 wt.-%) such as in chlorobenzene (CB) or 2-methoxyethanol (ME) the addition polymerization of 2.2-bis[4-(2,3-epoxypropoxy)phenyl]propan (DGEBA) and disecondary diamines leads to high molecular weight linear addition polymers. The broad molecular weight distribution (M w /M n = 4 to 17) is caused by the formation of cyclic oligomers. After precipitation in acetone, M w /M n values of 2.8 to 3.4 were obtained which indicate a regular linear step-growth polymerization. Differential scanning calorimetry (DSC) investigations show that CB retards the addition polymerization, whereas ME exhibits an acceleration of the polymerization. The suggested kinetic model describes the reaction behavior over the whole range of polymerization by one parameter set only. In order to find the optimum parameters, the set of differential equations was solved numerically by multivariate non-linear regression. An excellent agreement between calculated and experimental curves was found.
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