NMR study of the formation and degradation of network polyester methacrylates

Molecular mobility in the synthesis and degradation of the polymer of triethylene glycol dimethacrylate has been investigated. The results obtained coincide with thhe microheterogeneous model of formation of dense-network dimethacrylates via local microvolumes (grains) that are formed having a fully completed internal structure. The growth of grains in the course of polymerization results in the “infinite cluster” of grains that is formed in the polymer system at a degree of polymerization Δ amounting to 16–20%. It is proposed that kinetic features of the thermal degradation of a polymer are due to two competing chemical reactions: polymer samples with Δ 077% the degredation proceeds mainly as a decay of ester groups.