硬段含量对MDI型热塑性聚氨酯性能的影响  

Effects of Hard Segment Content on Properties of MDI Type Thermoplastic Polyurethane

作　　者：高允琪 王海瑞 韩立静 赵文[1] 崔勇胤 宗成中[1] GAO Yunqi;WANG Hairui;HAN Lijing;ZHAO Wen;CUI Yongyin;ZONG Chengzhong(School of Polymer Science and Engineering,Qingdao University of Science and Technology,Qingdao 266042,Shandong,China)

机构地区：[1]青岛科技大学高分子科学与工程学院,山东青岛266042

出　　处：《聚氨酯工业》2021年第2期17-20,共4页Polyurethane Industry

基　　金：山东省重点研发计划(2018JMRH0205)。

摘　　要：以4,4'-二苯基甲烷二异氰酸酯(MDI)、聚四亚甲基醚二醇(PTMG)和1,3-丙二醇(PDO)为原料,采用预聚体法合成热塑性聚氨酯(TPU),利用FTIR、DSC及力学性能测试等手段探究了硬段含量对TPU性能的影响。结果表明,硬段含量增加,TPU的氢键化程度、玻璃化转变温度、硬段熔融温度、拉伸强度、撕裂强度、硬度和模量均随之增大,软段结晶熔融温度及断裂伸长率随之减小;在硬段质量分数33%~45%范围内,TPU呈现"海-岛"结构,且随硬段含量增加,微相分离程度逐渐增加。Thermoplastic polyurethane(TPU)was synthesized with prepolymerization method used 4,4′⁃diphe⁃nylmethane diisocyanate(MDI),polytetramethylene ether glycol(PTMG)and 1,3⁃propanediol(PDO)as raw ma⁃terials.The effect of hard segment content on TPU properties were explored using FTIR,DSC,mechanical perform⁃ance testing and other means.The results showed that,when hard segment content increased,the degree of hydro⁃gen bonding of TPU,glass transition temperature,hard segment melting temperature,tensile strength,tear strength,hardness and the modulus all increased,while the crystalline melting temperature of the soft segment and the elongation at break decreased.In the range of hard segment content 33%~45%,TPU presented a sea⁃island structure,and the degree of microphase separation gradually increased with the increase of the hard segment con⁃tent.

关 键 词：热塑性聚氨酯 硬段含量 氢键化程度 热性能 力学性能 

分 类 号：TQ323.8[化学工程—合成树脂塑料工业] TQ.334