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Copolymer of lactide and ε-caprolactone catalyzed by bimetallic Schiff base aluminum complexes

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Abstract

A series of copolymers of lactide (LA) and ε-caprolactone (ε-CL) with different monomer feed ratios were achieved using three kinds of bimetallic Schiff aluminum complexes as catalysts. The ratios of LA and ε-CL units in different copolymers and the average segments length were determined by NMR analysis. The comparative kinetic study of L-LA/ε-CL and rac-LA/ε-CL copolymerization systems showed that the polymerization rate of LA was faster than ε-CL, and L-LA showed polymerization rate slightly faster than rac-LA. It was inferred that the copolymers achieved by these complexes were gradient copolymers with gradual change in distribution of LA and ε-CL units. The thermal properties of these copolymers were characterized by DSC analysis, which showed that the glass transition temperature (Tg) of these copolymers changed regularly according to the pro-portion change of two structural units.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Jilin University, Changchun, 130025, China

    Jingwei Yang & Lili Li

  2. Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, China

    Zhiqiang Sun, Ranlong Duan, Xuan Pang & Xuesi Chen

Authors
  1. Jingwei Yang
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  2. Zhiqiang Sun
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  3. Ranlong Duan
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  4. Lili Li
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  5. Xuan Pang
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  6. Xuesi Chen
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Corresponding authors

Correspondence to Lili Li or Xuan Pang.

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Yang, J., Sun, Z., Duan, R. et al. Copolymer of lactide and ε-caprolactone catalyzed by bimetallic Schiff base aluminum complexes. Sci. China Chem. 59, 1384–1389 (2016). https://doi.org/10.1007/s11426-016-0118-9

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  • DOI: https://doi.org/10.1007/s11426-016-0118-9

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