Citation: Lei Shi, Ruo-Yu Zhang, Wu-Bin Ying, Han Hu, Yu-Bin Wang, Ya-Qian Guo, Wen-Qin Wang, Zhao-Bin Tang, Jin Zhu. Polyether-polyester and HMDI Based Polyurethanes: Effect of PLLA Content on Structure and Property[J]. Chinese Journal of Polymer Science, ;2019, 37(11): 1152-1161. doi: 10.1007/s10118-019-2283-3 shu

Polyether-polyester and HMDI Based Polyurethanes: Effect of PLLA Content on Structure and Property

Lei Shi ^a,b ,
Ruo-Yu Zhang ^a,, ,
Wu-Bin Ying ^a ,
Han Hu ^a ,
Yu-Bin Wang ^a ,
Ya-Qian Guo ^a ,
Wen-Qin Wang ^b ,
Zhao-Bin Tang ^a,, ,
Jin Zhu ^a,,

a.
Key Laboratory of Bio-based Polymeric Materials Technology and Application of Zhejiang Province, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China
b.
School of Material Science and Chemical Engineering, Ningbo University, Ningbo 315211, China

Corresponding author: Ruo-Yu Zhang, zhangruoy@nimte.ac.cn Zhao-Bin Tang, tangzhb04@nimte.ac.cn Jin Zhu, jzhu@nimte.ac.cn
Received Date: 31 March 2019
Revised Date: 1 January 2019
Available Online: 10 June 2019

Thermoplastic poly(ether-ester-urethane)s were synthesized from poly(L-lactide) diols (PLLA diols), polytetrahydrofuran diol (PTMG diols), 4,4′-dicyclohexylmethane diisocyanate (HMDI), and 1,4-butanediol (BDO) by a two-step reaction, and the morphology and property of the resultant TPU could be adjusted by varying the PLLA contents. The soft segment was composed of PLLA and PTMG diols. By controlling the percentage of PLLA in the soft segment, the glass transition temperature and mechanical properties of the polyurethanes could be regulated. Based on the FTIR spectrum, we found that two kinds of hydrogen bonding existed individually in soft matrix and hard domain. The hydrogen bonding in soft matrix was unstable, which could be destroyed during elongation. With in situ stretching WAXS and SAXS experiments, we found that the PLLA crystal was destroyed and the PLLA domain oriented along the stretch direction. Finally, we proposed a schematic model to illustrate the microstructures of these elastomers before and after stretch.
- Poly(L-lactide) diol,
- Polyurethane,
- Mechanical property,
- Hydrogen bonding
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