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- W2256270003 abstract "Direct synthesis of polycarbonate by oxidative carbonylation of bisphenol A and CO was carried out using Pd-based redox catalyst systems. Under the following condition: PdC12 0.0l6mmol, the molar ratio of Pd Cu p-benzoquinone tetrabutylammoniun bromide =1:4:40:40, bisphenol A 22mmol, CH2Cl2 50mL, 4A molecular sieves 4g, CO 5.5MPa, O2 0.5MPa, reaction temperature 100℃, reaction time 12h and stirring speed 800rpm, a polycarbonate with M(subscript w)=2450 was obtained. The selected heteropolyacids and their tetrabutylammonium salts were explored as a promoter in the oxidative carbonylation of bisphenol A. The polymer with M(subscript w)=2225 was obtained over Pd-Mn-(TBA)8SiW12O42 catalyst system under the same reaction condition mentioned above for just 8h polymerization, which is better than that obtained in Pd-Cu-benzoquinone catalyst system (M(subscript w)=1720). The synthesized polycarbonate was analyzed in details using FT-IR, and a comparative IR analysis with commercial polycarbonate sample (M(subscript w)=22000) carried for the polymer identification confirmed the polycarbonate formation." @default.
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- W2256270003 date "2004-02-20" @default.
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- W2256270003 title "Direct Synthesis of Bisphenol A-based Polycarbonate by Oxidative Carbonylation" @default.
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