| POLYMERS AND POLYMER MATRIX COMPOSITES |
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| Effect of Hard Segment Content on Properties of Polyester Thermosensitive Polyurethane Elastomer |
| LI Tingting, LIU Jinchun
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| Key Laboratory of Rubber-plastics, Ministry of Education, School of Polymer Science and Engineering, Qingdao University of Science & Technology, Qingdao 266042, China |
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Abstract Diphenylmethane diisocyanate (MDI) system was used to synthesize temperature-sensitive polyurethane elastomers (CPU) with different hard segment contents by using the prepolymer method.The hard segment content was studied for normal temperature and temperature-varying mechanical properties of polyurethane elastomers. The effects of properties, dynamic properties, and temperature-sensitive properties of deformation. The results show that when the hard segment content is 62%, the tensile strength and tear strength of the material are the highest, and the elongation at break is the lowest; when the hard segment content is 63.5%, the hardness and glass transition temperature are the hig-hest; the tensile strength decreases with increasing temperature, and the elongation at break first increases and then decreases with increasing temperature, and reaches the maximum near the glass transition temperature. When the hard segment content is 62%, the overall performance of the CPU is excellent, and it has the typical deformation temperature sensitivity performance. With the change of external force, the change of the deformation and fixation rate of the polyurethane elastomer is not particularly obvious, which indicates that the cross-linking network of the CPU has a stable deformation and fixation rate. As the external force increases, the degree of damage to the cross-linking point becomes greater. Therefore, the deformation recovery rate decreases accordingly.
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Published: 28 January 2021
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| Fund:The Key R & D Projects of Shandong Province (2019GGX102044), Major Science and Technology Innovation Projects in Shandong Province (2019JZZY020204). |
About author:: Tingting Li, graduate student of Qingdao University of Science and Technology, mainly engaged in polyurethane synthesis and application research.
Jinchun Liu, associate professor, Qingdao University of Science and Technology. He has long been engaged in the synthesis, processing and application of polyurethane elastomers and foam materials, and research and development of new technologies in rubber processing. As a main member of the project team, he has participated in the research of the key scientific and technological projects of the Eighth Five-Year Plan period and the National Natural Science Foundation of China.
As the person in charge of the project, he presided over the completion of a research project of the Education Department and a number of corporate coo-peration topics, published more than 30 papers, and applied for more than 10 invention patents. |
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2021, Vol. 35 
