Abstract
This work examines some discrepancies between claimed effects in polymerization of certain metal acetylacetonates. Cupric acetylacetonate inhibits the thermal polymerization of styrene but acts only as a retarder in the sensitized polymerization of styrene and in the thermal polymerization of methyl methacrylate. Aluminium acetylacetonate initiates weakly the polymerization of styrene, but ferric acetylacetonate does not influence the rates of polymerization of the above mentioned monomers. Tetramethylthiuram disulphide (TMTD) acts as a free radical initiator for styrene polymerization with a rate very nearly proportional to [TMTD]∗. A low molecular weight phenolic condensate inhibits efficiently styrene polymerization. A mixture of TMTD and this phenolic condensate greatly decreases the induction period and increases the rate of subsequent polymerization, indicating a complex formation between the two substances.
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