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Vol. 26 No. 13 (2014): Vol 26 Issue 13

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Investigation of Silyl-Amide Complexes as Catalysts for the Ring-Opening Polymerization of L-Lactide

https://doi.org/10.14233/ajchem.2014.17724
Chanwoo Lee
Department of Innovative Industrial Technology, Hoseo University, Asan, Chungnam 336-851, Republic of Korea

Corresponding Author(s) : Chanwoo Lee

cwlee@hoseo.edu

Asian Journal of Chemistry, Vol. 26 No. 13 (2014): Vol 26 Issue 13

Abstract

A series of silyl-amide complexes (= M{N(SiMe3)2}2) were examined as the catalysts for the ring-opening polymerization of L-lactide. The poly(L-lactic acid) (PLLA) synthesized with the Zn complex showed a Mn near the theoretical value with narrow dispersity. The Zn complex without 1-dodecanol added also gave a poly(L-lactic acid) with Mn near 10,000 Da, although its molecular weight distribution was wide. The poly(L-lactic acid) obtained with the Sn complex in the absence of 1-dodecanol had a Mn higher than 40,000 Da, suggesting that the Sn catalyst involved in the insertion reaction with lactide should have higher activity for the polymerization. This steric space makes the coordination of L-lactide easier and causes faster rate of conversion in the early stage of the polymerization despite its small polarization.

Keywords

Silyl-amide complex Dispersity Molecular weight distribution Polymerization Catalyst.
Lee, C. (2014). Investigation of Silyl-Amide Complexes as Catalysts for the Ring-Opening Polymerization of L-Lactide. Asian Journal of Chemistry, 26(13), 4092–4096. https://doi.org/10.14233/ajchem.2014.17724
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