title: Studies on MMA-tBB resin. I. Comparison of TBB and other initiators in the polymerization of PMMA/MMA resin.
abstract: 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 degrees C. 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 x 10(3) and 247 x 10(3) for TBB resin, 297 x 10(3) and 282 x 10(3) for the BPO resin, and 267 x 10(3) and 231 x 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.
authors.affiliation: Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University, 2-3-10, Kanda-Surugadai, Chiyoda-ku, Tokyo 101-0062, Japan.
authors.forename: Chiemi
authors.initials: C
authors.lastname: Hirabayashi
authors.forename: Yohji
authors.initials: Y
authors.lastname: Imai
mesh_terms: D000704:Analysis of Variance; D001585:Benzoyl Peroxide / Q000737:chemistry; D001896:Boron Compounds / Q000737:chemistry*; D002850:Chromatography, Gel; D002851:Chromatography, High Pressure Liquid; D003764:Dental Materials / Q000737:chemistry*; D006801:Humans; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry; D020366:Methylmethacrylate / Q000737:chemistry*; D008970:Molecular Weight; D016877:Oxidants / Q000737:chemistry; D011108:Polymers / Q000737:chemistry; D019904:Polymethyl Methacrylate / Q000737:chemistry*; D019163:Reducing Agents / Q000737:chemistry; D013223:Statistics as Topic; D013729:Terpenes / Q000737:chemistry; D013997:Time Factors; D014052:Toluidines / Q000737:chemistry
chemical_list: D001896:Boron Compounds; D003764:Dental Materials; D008689:Methacrylates; D016877:Oxidants; D011108:Polymers; D019163:Reducing Agents; D013729:Terpenes; D014052:Toluidines; C009523:tri-n-butylborane; D020366:Methylmethacrylate; C048339:camphoroquinone; D019904:Polymethyl Methacrylate; C049840:2-(dimethylamino)ethyl methacrylate; C015835:dimethyl-4-toluidine; D001585:Benzoyl Peroxide