Question

化学论文部分内容翻译，求教

新型聚碳酸酯的合成
摘要:脂肪族聚碳酸酯具有可生物降解性，作为生物材料，其表面溶蚀降解机理和良好的生物相容性使其在医用等领域中受到越来越广泛的关注。本文通过2,2-二羟甲基-丙二酸二甲酯与氯甲酸乙酯的反应合成了环状碳酸酯单体5,5-二甲氧羰基-1,3-二氧六环-2-酮，再以异辛酸亚锡为催化剂，在不同温度下进行本体开环聚合，得到新型含酯基的聚碳酸酯。单体和聚合物结构经红外光谱、核磁共振氢谱及核磁共振碳谱表征。结果表明，开环聚合反应的产率和分子量随温度的升高而增加，但温度高于100℃时开环聚合会发生一定程度的脱羧反应。研究得出该聚合反应适合的反应条件为:反应温度90℃，反应时间12h，聚合过程中基本无脱羧反应发生。
关键词:六元环状碳酸酯；开环聚合；聚碳酸酯

Answer 1

the synthesis of novel polycarbonate
Abstract: aliphatic polycarbonate is biodegradable, it has attracted more and more attention in medical fields owing to its surface corrosible degradative mechanism and good biological compatibility as biological material. The cyclic carbonate monomer 5,5- di-methoxy carbonyl -1,3-dioxane -2- ketone is synthetised by the reaction of 2,2- dihydroxy methyl malonic acid dimethyl ester with chloroformate ethyl ester,catalysted by stannous octoate .The new polycarbonate is achieved though bulk ring-opening polymerization at different temperatures. The structure of monomer and polymer is characterizd by IR, 1H NMR and 13C NMR Spectra. The results show that the yield of ring opening polymerization reaction and molecular weight increase with temperature, but the ring-openingdecarboxylation reaction will certainly occur when temperature is higher than 100℃. It is concluded that the suitableconditions for the polymerization reaction are: reaction temperature 90 ℃, reaction time 12h, thus decarboxylation reaction hardly occurs in the the polymerizating process .
Keywords: hex-cyclic carbonate; ring-opening polymerization; polycarbonate