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

doi:10.6023/A1110151

Acta Chimica Sinica ›› 2012, Vol. 70 ›› Issue (07): 881-888 .DOI: 10.6023/A1110151 Previous Articles Next Articles

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三臂PPO-PDLA-PLLA 嵌段共聚物的制备与结构及其立构复合体的结晶行为

赵辰阳, 石文鹏, 马艳, 李速明, 范仲勇

复旦大学材料科学系上海 200433

投稿日期:2011-10-15 修回日期:2011-12-18 发布日期:2012-02-06
通讯作者: 范仲勇
基金资助:
国家自然科学基金(No. 51073041)资助项目.

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

Department of Materials Science, Fudan University, Shanghai 200433

Received:2011-10-15 Revised:2011-12-18 Published:2012-02-06
Supported by:
Project was supported by the National Natural Science Foundation of China (No. 51073041).

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 (T_m) 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.

Key words: poly(propylene oxide), polylactide, stereocomplex, block copolymer

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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 .

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三臂PPO-PDLA-PLLA 嵌段共聚物的制备与结构及其立构复合体的结晶行为

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

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