文献类型：期刊文献

英文题名：Synthesis, Morphology, and Properties of Polyurethane-triazoles by Click Chemistry

作者：Wang, Guiyou[1];Guo, Shiqing[1];Ding, Yun[1]

机构：[1]E China Univ Sci & Technol, Sch Mat Sci & Engn, Shanghai Key Lab Adv Polymer Mat, Shanghai 200237, Peoples R China

年份：2015

卷号：216

期号：18

起止页码：1894

外文期刊名：MACROMOLECULAR CHEMISTRY AND PHYSICS

收录：;EI(收录号：20153501212581);WOS:【SCI-EXPANDED(收录号:WOS:000362557000007)】；

基金：The authors thank the financial support from the project of Shanghai Automobile Industry Science and Technology Development Foundation (Grant No. 0711).

语种：英文

外文关键词：1,4-disubstituted triazole; click chemistry; hydrogen bonds; polyurethane; structure and morphology

摘要：To explore the applications of click chemistry in polyurethane materials, a series of novel linear polyurethane-triazoles (PUTs) are prepared using the in situ click reaction of propargylterminated polyurethanes with 1,4-dibromobutane in the presence of sodium azide. The PUT structures are confirmed by H-1 NMR, Fourier transform infrared (FTIR) spectroscopy, and elemental analysis, and the number-average molecular weights of PUTs range from (3.74-11.16) x 10(4) g mol(-1), determined by gel permeation chromatography. The triazole ring content is characterized and the effects of incorporating the triazole rings on the properties and morphologies of PUTs are examined. Because of the extra dipole-dipole interaction and hydrogen bonds of 1,4-disubstituted triazole in the hard segments, microphase separation of the PUTs is enhanced compared with conventional polyurethane extended with 1,4-butanediol. The tensile strengths of PUTs, from 21.8 to 39.0 MPa, are higher than conventional polytriazole elastomers, owing to the physical crosslinks formed by the hydrogen bonds in the PUTs. However, the thermal stability of the PUTs decreases as the hard segment content increases.