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使用Pd系氧化还原催化体系氧化羰化双酚A和CO直接合成了聚碳酸酯。在PdCl20 .0 1 6mmol,n(Pd)∶n(Cu)∶n(对苯醌 )∶n(四丁基溴化铵 ) =1∶4∶40∶40 ,双酚A 2 2mmol,CH2 Cl25 0mL ,4A分子筛 4g ,CO 5 .5MPa ,O2 0 .5MPa ,反应温度 1 0 0℃ ,搅拌速度 80 0rpm的条件下反应 1 2h ,得到的聚碳酸酯重均分子量Mw 为 2 4 5 0。探索了杂多酸和杂多酸的四丁基铵盐对氧化羰化双酚A直接合成聚碳酸酯的促进作用。使用Pd Mn (TBA) 8SiW1 2 O42 催化剂体系 ,在上述相同的实验条件下反应 8h ,得到的聚碳酸酯重均分子量Mw 为 2 2 2 5 ,好于Pd Cu 苯醌催化体系的结果 (Mw=1 72 0 )。对合成得到的聚碳酸酯进行了IR光谱分析 ,并通过与相同条件下得到的商品聚碳酸酯 (Mw=2 2 0 0 0 )的IR光谱对照 ,对实验结果进行了确认。
Polycarbonates were directly synthesized by oxidative carbonylation of bisphenol A and CO using a Pd-based redox catalytic system. In a solution of PdCl20.016mmol, n (Pd): n (Cu): n (p-benzoquinone): n (tetrabutylammonium bromide) = 1: 4:40:40, bisphenol A 2 2mmol, 0mL, 4A molecular sieves 4g, CO 5 .5MPa, O2 0 .5MPa, the reaction temperature is 100 ° C, the stirring speed 80 0rpm reaction conditions 12h, the resulting polycarbonate weight average molecular weight Mw of 2450. The tetrabutyl ammonium salts of heteropolyacids and heteropoly acids were explored to promote the direct synthesis of polycarbonates by oxidative bisphenol A oxidation. The Pd Mn (TBA) 8SiW1 2 O42 catalyst system was reacted under the same experimental conditions for 8h to obtain a polycarbonate with a weight average molecular weight Mw of 2 2 2 5, which is better than that of the Pd Cu benzoquinone catalyst system (Mw = 1 72 0). The synthesized polycarbonate was subjected to IR spectral analysis, and the experimental results were confirmed by comparison with the IR spectrum of the commercial polycarbonate obtained under the same conditions (Mw = 2200).