Improving the Ring-opening Polymerization of l-Lactide Using n-Butyl Lithium with Various Bidentate Ligands

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• 作者：Hsuan-Ying Chen ; Yen-Tzu Huang ; Jaya Kishore Vandavasi ; Yu-Hsieh Chen and Chia-Hao Kuei
• 刊名：Journal of the Chinese Chemical Society
• 出版年：2016
• 出版时间：October 2016
• 年：2016
• 卷：63
• 期：10
• 页码：859-863
• 全文大小：558K
• ISSN：2192-6549

文摘

A series of bidentate ligands were examined to improve the catalytic activity of l -lactide (LA) polymerization by using n-butyl lithium and BnOH. For LA polymerization, n-butyl lithium with tetraisopropyl methylenebis(phosphonate) (L⁸ ) showed the greatest catalytic activity but with poor controllability of the polymer molecular weight. The polydispersity indices (PDIs) could be improved without BnOH addition, but Mn _GPC was much different from the Mn _Cal . ¹H NMR spectra confirmed that the cyclized PLA was obtained, thus implying that active chain-end mechanisms were operative in LA polymerization.