Abstract
The authors have studied the kinetics of thermal breakdown of PMMA cross-linked by diol dimethacrylates. It is shown that destruction occurs in two stages, the length of the hydrocarbon chain of dimethacrylate influencing only the second stage. Crosslinkage of PMMA lowers the maximum rate of the first stage of breakdown; in the second stage rise in the concentration of the crosslinkage agent in the copolymers has the reverse effect. The overall influence of the concentration of dimethacrylate on both stages also determines the maximum in the dependence of the total rate of breakdown on the degree of crosslinkage.
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