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Citation: PING Peng, WANG Wen-Shou, CHEN Xue-Si, JING Xia-Bin. Segmented Polyurethanes Based on Poly (L-lactide): A Phase Separation Study[J]. Chinese Journal of Applied Chemistry, ;2007, 24(2): 124-127. shu

Segmented Polyurethanes Based on Poly (L-lactide): A Phase Separation Study

PING Peng ^a,b ,
WANG Wen-Shou ^a,b ,
CHEN Xue-Si ^a ,
JING Xia-Bin ^a,,

1.
a State Key laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese academy of Science, Changchun 130022;
2.
b Graduate School of Chinese academy of Science, Beijing

Corresponding author: JING Xia-Bin,
Received Date: 2 June 2006
Available Online: 15 August 2006
Fund Project: 国家自然科学基金(20274048,50373043) (20274048,50373043)中国科学院知识创新方向性项目(KJCX2-SW-H07) (KJCX2-SW-H07)

A series of segmented poly(L-lactide)-polyurethanes(PLA-PU) were synthesized via a two-step method,with oligo-poly(L-lactide)(PLA) as the soft segments and the reaction product of 2,4-toluene diiso-cyanate(TDI) and ethylene glycol(EG) as the hard segments.The molecular mass(M_n) of the PLA was 1500~9500,and the molar ratio of PLA/TDI/EG was from 1:2:1 to 1:7:6.The degree of phase separation in the PLA-PUs was examined as a function of their composition and thermal history with differential scanning calorimetry and wide-angle X-ray diffraction(WAXD).The results show that the thermal history has an impor-tant impact on the degree of phase separation in PLA-PUs,and the molecular mass of the PLA segments and the length of the TDI-EG segments have evident influence on the rate and perfection of the phase separation.
- shape memory,
- polyurethane,
- poly(L-lactide) ,
- phase separation,
- biodegradable polymer
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