摘要
选用二苯基甲烷二异氰酸酯(MDI)体系,采用预聚体法合成不同硬段含量的温敏聚氨酯弹性体(CPU)。研究了硬段含量对聚氨酯弹性体常温及变温力学性能、热性能、动态性能以及形变温敏性能的影响。结果表明:当硬段含量为62%时,材料的拉伸强度、撕裂强度最高,扯断伸长率最低;当硬段含量为63.5%时,硬度、玻璃化转变温度最高;拉伸强度随温度的升高而降低,扯断伸长率随温度的升高先增加后减小,且在玻璃化转变温度附近达到最大。硬段含量为62%时,CPU的综合性能较为优异,且具有典型的形变温敏性能,随着外界力的变化,聚氨酯弹性体的形变固定率变化并不是特别明显,而形变回复率因此下降。
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.
作者
李廷廷
刘锦春
LI Tingting;LIU Jinchun(Key Laboratory of Rubber-plastics,Ministry of Education,School of Polymer Science and Engineering,Qingdao University of Science&Technology,Qingdao 266042,China)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2021年第2期2161-2165,共5页
Materials Reports
基金
山东省重点研发计划项目(2019GGX102044)
山东省重大科技创新工程项目(2019JZZY020204)。
关键词
聚酯型
聚氨酯弹性体
硬段含量
形变温敏
polyester type
polyurethane elastomer
hard segment content
deformation temperature sensitivity
