Acta Chimica Sinica ›› 2011, Vol. 69 ›› Issue (06): 719-724. Previous Articles     Next Articles

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  1. (1 复旦大学材料科学系 上海 200433)
    (2中国石油化工股份有限公司上海石油化工研究院 上海 201208)
  • 投稿日期:2010-09-15 修回日期:2017-01-31 发布日期:2010-11-15
  • 通讯作者: 范仲勇
  • 基金资助:


Synthesis, Structure, and Properties of Polylactide-Based Degradable Shape Memory Polymers

Ma Yan1 Shi Wenpeng1 Zhao Chenyang1 Yang Dongmei1 Lu Qi1 Li Suming1 Tu Jianjun2 Wang Wei2 Fan Zhongyong*,1   

  1. (1 Department of Materials Science, Fudan University, Shanghai 200433)
    (2 Shanghai Research Institute of Petrochemical Technology, China Petroleum and Chemical Corporation, Shanghai 201208)
  • Received:2010-09-15 Revised:2017-01-31 Published:2010-11-15

A series of degradable poly(propylene oxide)-poly(L-lactide)-polyurethane (POLA-PU) shape memory polymers were synthesized by crosslinking triarm POLA diblock copolymers with tolylene diisocyanate (TDI). The mechanical properties of POLA-PU could be conveniently adjusted through variation of composition to prepare materials from high modulus and low elongation at break to low modulus and high elongation at break. The transition temperatures of POLA-PU were between 96 and 153 ℃ by thermomechanical analysis (TMA) and the restoration time was less than 20 s in 140 ℃. When the deformations from the permanent to the temporary shape were up to 200%, POLA-PU samples had a shape fixity rate between 65% and 100% and a shape recovery rate of 100%. Shape memory behavior relies on the cross-linking densities, and this effect can be achieved with changing conformational entropy of soft chains in different temperatures. The degradation of POLA-PU was investigated in 10% NaOH at 80 ℃. The results showed that the PLLA segments were introduced to novel shape memory materials with the degradable property, and the rate of degradation was decreased with decreasing the PLLA segments content.

Key words: polyether, polylactide, polyurethane, shape memory, degradation