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经低分子聚乳酸热解得到的丙交酯中,含有少量乳酸、水及降解产物,这种粗单体必须经过精制除去杂质,才适合于开环聚合并能够获得较高分子量的聚丙交酯,本文研究了乙酸乙酯—苯混合溶剂体系用于丙交酯的重结晶纯化,通过实验确定了最佳的丙交酯重结晶溶剂体系和条件。
The low molecular weight polylactic acid obtained by lactide lactide, containing a small amount of lactic acid, water and degradation products, this crude monomer must be refined to remove impurities before they are suitable for ring-opening polymerization and to obtain higher molecular weight polylactide In this paper, the ethyl acetate-benzene mixed solvent system was studied for the purification of lactide. The optimal solvent system and conditions for lactide recrystallization were determined by experiments.