Universität Hamburg, Institut für Anorganische und Angewandte Chemie, Martin-Luther-King-Platz 6, D-20146, Hamburg, Germany.
ChemistryOpen. 2020 Nov 2;9(12):1224-1228. doi: 10.1002/open.202000243. eCollection 2020 Dec.
The chemical recycling of poly(lactide) was investigated based on depolymerization and polymerization processes. Using methanol as depolymerization reagent and zinc salts as catalyst, poly(lactide) was depolymerized to methyl lactate applying microwave heating. An excellent performance was observed for zinc(II) acetate with turnover frequencies of up to 45000 h. In a second step the monomer methyl lactate was converted to (pre)poly(lactide) in the presence of catalytic amounts of zinc salts. Here zinc(II) triflate revealed excellent performance for the polymerization process (yield: 91 %, M ∼8970 g/mol). Moreover, the (pre)poly(lactide) was depolymerized to lactide, the industrial relevant molecule for accessing high molecular weight poly(lactide), using zinc(II) acetate as catalyst.
基于解聚和聚合过程，研究了聚（丙交酯）的化学回收。以甲醇为解聚试剂，锌盐为催化剂，采用微波加热，将聚（丙交酯）解聚为乳酸甲酯。醋酸锌的转化率频率高达 45000 h，表现出优异的性能。在第二步中，在催化量的锌盐存在下，将单体乳酸甲酯转化为（预）聚乳酸甲酯。在这里，三氟甲磺酸锌对聚合过程表现出优异的性能（产率：91%，M∼8970 g/mol）。此外，（预）聚乳酸甲酯在醋酸锌的催化下解聚为丙交酯，丙交酯是获得高分子量聚乳酸的工业相关分子。
