Studies on MMA-TBB Resin I. Comparison of TBB and Other Initiators in the Polymerization of PMMA/MMA Resin

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Polymerization characteristics of poly (methyl methacrylate) (PMMA) /(methyl methacrylate) (MMA) resin initiated by tributylborane (TBB) were compared with those by benzoyl peroxide (BPO) / N,N-dimethyl-p-toluidine and camphorquinone (CQ) /N,N-dimethylaminoethyl methacrylate from the aspects of temporal changes of residual MMA and molecular weight up to 4 weeks at 37℃. Residual MMA 30 min after polymerization decreased from 8.15% for TBB resin, 8.39% for the BPO resin, and 9.19% for the CQ resin to 0.48%, 3.54%, and 6.79%, respectively, after 4 weeks. The molecular weights at 30 min and 4 weeks after polymerization were 409 × 10_3 and 247 × 10_3 for TBB resin, 297 × 10_3 and 282 × 10_3 for the BPO resin, and 267 × 10_3 and 231 × 10_3 for the CQ resin, respectively. The present results revealed that the TBB-initiated polymerization had unique and different characteristics compared with those initiated by the other common initiators: (1) The decrease in residual MMA was fast, sustained for a long time and resulted in very low value; (2) high molecular weight PMMA was formed first and then decreased with time.