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中文摘要：
直接以乳酸、丙氨酸为原料，通过熔融聚合法合成生物降解材料聚（乳酸-丙氨酸）[P（LA-co-Ala）]，并用特性粘数、IR、^1H-NMR等手段对目标产物进行了表征。研究催化剂的种类和用量、聚合温度、聚合时间等对P（LA-co-Ala）合成的影响，得到最佳实验条件为：分步脱水后，以SnO为催化剂（质量分数为0．7％），170℃、70Pa下反应8h，P（LA-co-Ala）的特性粘数为0．7888dL／g。
英文摘要：
Directly using lactic acid （LA） and Maine （Ala） as starting monomer material ,biodegradable material poly（ lactic acid- co-alaine） [ P（LA-co-Ala） ] was synthesized via melt polycondensation. The copolymer was characterized with intrinsic viscosity, IR, and ^1H NMR. The influence of catalyst kinds and quantity, polymerization temperature and time on the synthesis of P （LA-co- Ala） was discussed. The optimum reaction condition of the direct melt polycondensation was that, after twice prepolymerization, using SnO （0.7wt%） as catalyst,the 8h＇ s polymerization under 170 ℃ and 70 Pa gave P（LA-co-Ala） with the maximum intrinsic viscosity 0. 7888 dL/g.
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