端炔基聚乙二醇制备的聚三唑弹性体  

Polytriazole Elastomers Based on Akyne-Terminated Polyethylene Glycol

作　　者：王琳晓 别如烨 方建维 张雨 万里强[1] 黄发荣[1] WANG Linxiao;BIE Ruye;FANG Jianwei;ZHANG Yu;WAN Liqiang;HUANG Farong(Key Laboratory of Specially Functional Polymeric Materials and Related Technology(Ministry of Education),School of Materials Science and Engineering,East China University of Science and Technology,Shanghai 200237,China)

机构地区：[1]华东理工大学材料科学与工程学院,特种功能高分子材料及相关技术教育部重点实验室,上海200237

出　　处：《功能高分子学报》2021年第6期529-536,共8页Journal of Functional Polymers

基　　金：中央高校基本科研业务费专项资金(JKD01211701)资助项目。

摘　　要：首先,以聚乙二醇(PEG)和溴丙炔为原料合成了端炔基聚乙二醇(DPPEG);然后以DPPEG、4,4-联苯二苄叠氮(BPDBA)和间二乙炔基苯(m-DEB)为原料,以热聚合的方式合成了聚三唑弹性体(PTAE)。采用核磁共振氢谱(^(1)H-NMR)和傅里叶变换红外光谱(FT-IR)对其结构进行了表征,并通过差示扫描量热(DSC)分析、热重分析(TGA)和万能拉伸试验机测定其热性能和力学性能。结果表明:PTAE具有较好的力学性能和热稳定性,其拉伸强度可达22.5 MPa,质量损失5%的热分解温度高于335℃。Elastomers have a wide range of applications and a large market capacity,while general-purpose elastomers have the disadvantages of poor heat resistance and complex synthesis processes.Compared with traditional elastomer,polytriazole elastomer(PTAE)has the advantages of good heat resistance and simple synthesis,while the existed PTAE has poor mechanical properties(tensile strength<10 MPa).In order to obtain PTAE with excellent mechanical properties,a series of novel PTAEs with soft segments and hard segments alternately distributed along the main chain were synthesized via a metal-free 1,3-dipolar cycloaddition reaction.Based on the structural characteristics,alkynyl-terminated polyethylene glycol(DPPEG)with various amounts of polyether segments,biphenyl dibenzyl azide(BPDBA)with rigid aromatic rings and diethynylbenzene(m-DEB)were employed as soft segments,hard segments,and chain extender,respectively.The PTAEs possess good mechanical properties and thermal stability.With the increase of the DPPEG molar content,the tensile strength decreases from 16.27 MPa to 1.70 MPa,the elongation at break first increases and then decreases,ranging from 249%to 990%.And with the increase of DPPEG molecular weight,the tensile strength first increases and then decreases,ranging from 0.80 MPa to 22.5 MPa,and the elongation at break first decreases and then increases,ranging from 196%to 325%.Although the thermal stability of PTAE decreases with the increase of molar content and molecular weight of DPPEG,the decomposition temperature of 5%mass loss still exceeds 335℃,which proves that the structure has good thermal stability.The glass transition temperature of PTAE is less than 10℃,which can maintain elasticity at room temperature.

关 键 词：端炔基聚乙二醇 聚三唑弹性体 1 3-偶极环加成反应 

分 类 号：O633.5[理学—高分子化学]