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本文主要进行了丙交酯的合成工艺研究及聚乳酸的开环聚合工艺研究。We use the method of decomposing PLA to synthesize lactide by means of orthodoxical experiment method.

制备聚乳酸常通过乳酸的直接聚合或丙交酯的开环聚合两种方法。PLA has been produced by ring-opening polymerization of lactide or direct polycondensation of lactic acid.

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本文研究了间接法合成聚乳酸，即丙交酯的合成和丙交酯的开环聚合。The synthesis process was chiefly divided into two steps---Preparing lactide and Ring-opening polymerization.

结果表明，所选择的各模型反应为吸热反应且近似可逆，水的控制对丙交酯的形成很重要。The results indicated that control of water in the reaction system was very important to the formation of lactide.

聚乳酸的制备多采用乳酸脱水生成丙交酯，然后开环聚合成聚乳酸。Lactide, which was synthesized through lactic acid condensation, was polymerized to form PLA by ring-opened of lactide.

丙交酯中残留乳酸含量的分析有助于对丙交酯的纯度及后期应用的质量进行控制。Determination of lactic acid residue in L- lactide is necessary in controlling its purity and the quality in applications.

本工艺不但可降低丙交酯的生产成本，而且解决了厨房垃圾的环境污染问题。This technology can not only reduce the cost of producing lactide , but also solve the pollution problems from kitchen garbage.

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研究了D，L-丙交酯在浓硫酸催化作用下，与乙醇进行酯交换反应合成乳酸乙酯。Ethyl lactate was synthesized by transesterification of D, L- lactide with ethanol utilizing concentrated sulfuric acid as catalyst.

通过优化丙交酯与乙交酯比例及加入特殊的聚合物末端基来获得特殊的药物-聚合物间相互作用。Specific drug–polymer interactions are engineered by optimizing the lactide to glycolide ratio and including specific polymer end groups.

最后对合成的丙交酯进行定性表征，并比较了乙酸乙酯和丙酮两种溶剂纯化丙交酯的重结晶效果。Finally, the structure of lactide was characterized and the solvent effects on the recrystallization were compared between ethyl acetate and acetone.

改进了提纯L-丙交酯的方法，采用熔点、红外光谱、紫外光谱、数字自动旋光仪及高效液相色谱对提纯后的L-丙交酯进行了表征。Improved the method of purification, the structure of lactide was characterized by the melting point, IR, UV, Digital Automatic Polarimeter and HPLC.

采用了FTIR、DSC、WAXD等方法对聚乳酸的结构进行了表征，结果表明聚乳酸是L-丙交酯开环聚合产物。The structure of polylactic acid is characterized with FTIR, DSC, WAXD methods. The results show that PLLA is the lactide ring-opening polymerization product.

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摸索色谱条件，自行建立了反相高效液相色谱法测定丙交酯和乳酸乙酯含量的方法。Some exploring experiments were carried out and a stable, accurate and highly sensitive HPLC method was constructed for quantitative analysis of lactide and ethyl lactate.

研究了乳酸熔融缩聚和溶剂回流脱水缩聚两种聚合方法及几种扩链剂对乳酸聚合物相对分子质量的影响。The influence of melt polycondensation and solvent refluxing methods of lactide polymerization and chain extension agents on relative molecular weight of polylactide was studied.

采用密度泛函方法研究了丙交酯的合成过程，优化了合成过程中可能出现的化合物的几何构型，分析了各化合物的振动频率和偶极矩。Theoretical studies on synthetic process of lactide were carried out with density functional theory and the geometries of compounds maybe to appear in reactive system were optimized.

丙交酯的产率低，同时聚乳酸的亲水性差，降解速度慢，限制了聚乳酸在生物医药领域的应用。However, the yield of lactide wasn't satisfical, and hydrophilicity of PLA was so bad that it leaded to low degradation rate, these shortcomings limited its use in some biomedical fields.

乳酸经减压蒸馏制得单体丙交酯，再以氧化锌为催化剂聚合得到聚乳酸。Lactide monomer was obtained by vacuum distillation of lactic acid. After purification by recrystallization, the lactide was polymerized to polylactic acid with zinc oxide as the catalyst.

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丙交酯开环聚合制备聚乳酸是目前研究得较多的聚乳酸聚合方法，能够获得高分子量聚乳酸，这种方法对丙交酯的质量和成本提出了较高的要求。The Lactide ring-opening polymerization is the most important way to produce PLA, which obtain high molecular weight product. The quality and the price of Lactide influence the final result.