Thermal catalytic depolymerization of poly(L-lactic acid) oligomer into LL-lactide : Effects of Al, Ti, Zn and Zr compounds as catalysts
Thermal catalytic depolymerization of poly(L-lactic acid) oligomer into LL-lactide : Effects of Al, Ti, Zn and Zr compounds as catalysts
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聚（L-乳酸）低聚物热催化解聚为 LL-丙交酯：Al、Ti、Zn 和 Zr 化合物作为催化剂的作用
DOI：
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发表时间：
1999
期刊：
影响因子：
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通讯作者：
H. Okuyama
中科院分区：
文献类型：
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作者：
M. Noda;H. Okuyama
使用β-环糊精手性固定相毛细管柱，通过气相色谱法评估了一系列Al、Ti、Zn和Zr化合物，即它们的金属醇盐、有机酸和烯醇盐、卤化物和氧化物，作为聚(L-乳酸)低聚物热解聚反应生成LL-丙交酯、内消旋-丙交酯和DD-丙交酯的分子内酯交换催化剂。与2-乙基己酸亚锡相比，分子内酯交换反应活性依次为：Sn>Zn>Zr>Ti>Al。
A series of Al, Ti, Zn and Zr compounds, ie., their metal alkoxides, organic acid and enolate salts, halid and oxide, were evaluated as intramolecular transesterification catalysts for the thermal depolymerization reaction of poly(L-lactic acid) oligomer resulting in LL-lactide, meso-lactide and DD-lactide by gas chromatography using a β-cyclodexstrin chiral stationary phase capillary column. The activity of the intramolecular transesterification compared with that of stannous 2-ethylhexanoate was in the following order: Sn>Zn>Zr>Ti>Al.