Abstract
The results of a study of the influence of 2,2′-methylene-bis-(4,6-di-tert, butylresorcinol), diphenylolcyclopentane and diphenylolcyclohexane on the thermal degradation of polymethylmethacrylate (PMMA) show that the three dimensionally substituted phenols specified above may be used as thermal stabilizers for PMMA when introduced either into the polymer or into the polymerizable system. The compounds under study do not inhibit the radical polymerization of MMA in bulk, and participate in the reaction as chain transfer agents, simultaneously reducing the overall rate of polymerization. The chain transfer constants have been evaluated, and the presence of stabilizer fragments in the composition of the polymer chains is shown in the light of UV spectroscopy investigations.
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