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Influence of lactic acid on the catalytic performance of MDABCO for ring-opening polymerization of l-lactide
Applied Catalysis A: General ( IF 5.5 ) Pub Date : 2017-08-05 , DOI: 10.1016/j.apcata.2017.08.007
Zhixiong Luo , Somboon Chaemchuen , Kui Zhou , Andres Alvarado Gonzalez , Francis Verpoort

A series of metal organic frameworks (MOFs) MDABCO (M = Co, Ni, Cu, Zn; DABCO = 1,4-diazabicyclo[2.2.2]octane) are utilized as catalysts for the bulk ring-opening polymerization of l-lactide. The catalytic activity varies in the order CuDABCO, NiDABCO < ZnDABCO, CoDABCO. By adding lactic acid, we unexpectedly observed enhanced catalytic activity. The combined use of lactic acid and ZnDABCO during polymerization results in a highly active polymerization system, along with the gradual change of MOFs structure caused by an increased acid concentration. Compared to related homogeneous fragments, such as zinc nitrate and 1,4-diazabicyclo[2.2.2]octane, ZnDABCO is found to afford highly isotactic polylactide, which would be ascribed to the unique structural properties of MOFs.



中文翻译:

乳酸对MDABCO催化1-丙交酯开环聚合反应的影响

一系列金属有机骨架(MOFs)MDABCO(M = Co,Ni,Cu,Zn; DABCO = 1,4-二氮杂双环[2.2.2]辛烷)被用作1-丙交酯的本体开环聚合的催化剂。催化活性按CuDABCO,NiDABCO <ZnDABCO,CoDABCO的顺序变化。通过添加乳酸,我们出乎意料地观察到了催化活性的增强。聚合过程中乳酸和ZnDABCO的组合使用可产生高活性的聚合体系,以及由于酸浓度增加而引起的MOF结构的逐渐变化。与相关的均相片段(例如硝酸锌和1,4-二氮杂双环[2.2.2]辛烷)相比,发现ZnDABCO提供了高度等规的聚丙交酯,这归因于MOF的独特结构性质。

更新日期:2017-08-05
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