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Synthesis, Structures and Characterization of Triarm PPO-PDLAPLLA Block Copolymers and Its Stereocomplex Crystallization Behavior

  • Zhao Chenyang ,
  • Shi Wenpeng ,
  • Ma Yan ,
  • Li Suming ,
  • Fan Zhongyong
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  • Department of Materials Science, Fudan University, Shanghai 200433

Received date: 2011-10-15

  Revised date: 2011-12-18

  Online published: 2012-02-06

Supported by

Project was supported by the National Natural Science Foundation of China (No. 51073041).

Abstract

The triarm poly(propylene oxide)-poly(D-lactide) (PPO-PDLA) copolymer was prepared by ring-opening polymerization (ROP) of D-lactide (DLA) with low unsaturated poly(propylene oxide) triols (PPO) as an initiator. The terminal hydroxyls of the prepolymer were activated by stannous octanoate [Sn(Oct)2]. Then a series of novel triarm poly(propylene oxide)-poly(D-lactide)-poly(L-lactide) (PPO-PDLA-PLLA) block copolymers were synthesized by ROP of L-lactide (LLA) with functioned PPO-PDLA prepolymer as a macroinitiator. Fourier transform infrared (FTIR), nuclear magnetic resonance spectroscopy (NMR) and gel permeation chromatography (GPC) results confirmed the configuration of triarm PPO-PDLA-PLLA block copolymers with high isotacticity, and the number average molecular weight of the samples could be greater than 100 kDa . The block structure of copolymer chain could be readily adjusted in terms of LLA units and molecular weight of PPO-PDLA prepolymer. Differential scanning calorimetry (DSC) and wide-angle X-ray diffraction (WAXD) demonstrated that the stereocomplex PLAs (sc-PLAs) were formed between intermolecular PLLA and PDLA blocks without PLLA crystallization process. The melting temperature (Tm) of sc-PLA crystal was about 200 ℃, which was much higher than that of pure PLLA. These results show that the triarm PPO-PDLA-PLLA block copolymers could be promising as a heat-resistant poly(lactic acid) (PLA) material.

Cite this article

Zhao Chenyang , Shi Wenpeng , Ma Yan , Li Suming , Fan Zhongyong . Synthesis, Structures and Characterization of Triarm PPO-PDLAPLLA Block Copolymers and Its Stereocomplex Crystallization Behavior[J]. Acta Chimica Sinica, 2012 , 70(07) : 881 -888 . DOI: 10.6023/A1110151

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