Study on thermodynamic properties of polyurethane fibers under small strain

6th Annual International Conference on Material Science and Engineering

You, Gexin^1 ; Liu, Xinsen^1 ; Wang, Wenchao^1 ; Chen, Jinkai^1 ; Zhou, Xiuwen^2

School of Mechanical and Automotive Engineering, South China University of Technology, 381 WuShan Road, TianHe Strict, Guang Zhou

510640, China^1

China Academy of Engineering Physics, 64 MianShan Road, MianYang

621000, China^2

关键词: Enthalpy change;    Entropy changes;    Polyurethane fiber;    Small strains;    Stress temperature;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/397/1/012014/pdf
DOI  :  10.1088/1757-899X/397/1/012014

来源: IOP

【 摘 要 】

In thiswork, dynamic thermodynamic analyzer (DMA) was used to determine the stress-temperature relationship of polyurethane fibers to research the thermodynamic properties under small strains. The results show that the stress of polyurethane fibers increases with the increase of temperature. The study of the energy conversion during the heating processof polyurethane fibers demonstrates that the entropy change decreases with the increase of the strain while the enthalpy change has the contrary tendency. The entropy change is the key reason for the stress of polyurethane fibers.