R值对聚氨酯微孔弹性体性能的影响  

Effect of R Value on Properties of Polyurethane Microporous Elastomers

作　　者：汤叶欢 鞠明杰[1] 林珩[1] 郑柏存[1] TANG Yehuan;JU Mingjie;LIN Heng;ZHENG Baicun(East China University of Science and Technology,Shanghai 200237,China)

机构地区：[1]华东理工大学,上海200237

出　　处：《聚氨酯工业》2021年第6期24-27,共4页Polyurethane Industry

摘　　要：以聚四氢呋喃二醇(PTMEG)、4,4′-二苯基甲烷二异氰酸酯(MDI)、1,4-丁二醇(BDO)和水为原料,采用半预聚物法合成了不同异氰酸酯指数(R值)的聚氨酯微孔弹性体(MPUE)。通过红外光谱、X射线衍射、力学性能、热失重等对样品进行表征和测试。结果表明,随着R值升高,MPUE的硬段结晶度先增大后减小,氢键化程度提高,微相分离程度增大,力学性能增强,耐热性降低。Polyurethane microporous elastomers(MPUE)with different isocyanate index(R value)were synthesized by semi prepolymer method using polytetramethylene ether glycol(PTMEG),4,4′-diphenylmenthane diisocyanante(MDI),1,4-butanediol(BDO)and water as raw materials.The samples were characterized by FT-IR,XRD,TG and mechanical properties test.The results showed that,when R value increased,the degree of hydrogen bonding,the degree of micro phase separation and the mechanical properties all increased,while the crystallinity of hard segment of MPUE increased first and then decreased,the heat resistance decreased.

关 键 词：异氰酸酯指数 聚氨酯微孔弹性体 微相分离 氢键 

分 类 号：TQ333.95[化学工程—橡胶工业]