Citation: TIAN Yumeng, LI Xuemin, LI Xiaoxiao, HUAN Yan, YE Feng, YANG Xiaoniu. Effect of Molecular Cross-linking Degrees on the Morphology and Tribological Properties of 1, 4-Phenylene Diisocyanate-Based Polyurethane Elastomers[J]. Chinese Journal of Applied Chemistry, ;2018, 35(9): 1148-1154. doi: 10.11944/j.issn.1000-0518.2018.09.180217 shu

Effect of Molecular Cross-linking Degrees on the Morphology and Tribological Properties of 1, 4-Phenylene Diisocyanate-Based Polyurethane Elastomers

TIAN Yumeng ^a,b ,
LI Xuemin ^a,b ,
LI Xiaoxiao ^a,d ,
HUAN Yan ^a ,
YE Feng ^c,, ,
YANG Xiaoniu ^a,c

a.
Polymer Composites Engineering Laboratory, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
b.
University of Science and Technology of China, Hefei 230026, China
c.
State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
d.
University of Chinese Academy of Sciences, Beijing 100049, China

Corresponding author: YE Feng, yefeng@ciac.ac.cn
Received Date: 20 June 2018
Revised Date: 26 June 2018
Accepted Date: 26 June 2018

Fund Project: the High-tech Industrialization Special Fund Project for Science and Technology Cooperation of Jilin Province and Chinese Academy of Sciences 2017SYHZ0019Supported by the Key Deployment Project of Scientific and Technological Innovation of the Chinese Academy of Sciences(No.KGFZD-135-18-011-02), the High-tech Industrialization Special Fund Project for Science and Technology Cooperation of Jilin Province and Chinese Academy of Sciences(No.2017SYHZ0019), the Changchun Science and Technology Project(No.16ss17), the Jilin Province Science and Technology Development Project(No. 20160204031G X)the Key Deployment Project of Scientific and Technological Innovation of the Chinese Academy of Sciences No.KGFZD-135-18-011-02the Jilin Province Science and Technology Development Project 20160204031G Xthe Changchun Science and Technology Project 16ss17

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The friction properties of polyurethane elastomers are of great significance in areas such as marine, automotive, and biomedical applications. However, the fine design of friction properties of such materials through chemical modification strategies still has urgent needs in research and application prospects. In this work, p-phenylene diisocyanate (PPDI) and polytetramethylene ether glycol (PTMG) were used, and the PPDI-based polyurethane elastomers with different degrees of cross-linking were synthesized through varing the molar ratio of two chain extenders of 1, 4-butanediol and trimethylolpropane. Results of the Fourier transform attenuated total reflection spectra (FTIR-ATR), wide-angle X-ray diffraction (WAXD) and differential scanning calorimetry (DSC) indicate that the crystallinity of both hard segment and soft segment in polyurethane elastomer is inhibited with the increase of cross-linking degree. Meanwhile, the results of mechanical test show that the elastic modulus of the material decreases, while the friction coefficient of PPDI-based polyurethane elastomer increases. In addition, the hysteresis loop curve shows that the change in the degree of cross-linking also affects the damping properties of the PPDI-based polyurethane elastomer, and the difference in the damping of the polyurethane elastomer is also reflected in the dependence of the friction performance on the rate. This work therefore proposes that by using different degrees of crossl-inking, the crystallinity of hard and soft segments in PPDI-based polyurethane can be changed, which leads to the difference in the elastic and the loss modulus of the material, and the friction properties can thus be controlled, which provides a simple-to-achieve and effective way for the regulation of frictional properties of PPDI-based polyurethane elastomers.
- polyurethane elastomers,
- degree of cross-linking,
- tribology,
- micro-phase separation,
- elastic modulus
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