Synthesis, Morphology, and Properties of Polyurethane‐triazoles by Click Chemistry. Issue 18 (20th August 2015)

• Record Type: Journal Article
• Authors: Wang, Guiyou; Guo, Shiqing; Ding, Yun
• Is Part Of: Macromolecular chemistry and physics. Volume 216:Issue 18(2015:Sep.)
• Page Start: 1894
• Page End: 1904
• Publication Date: 2015-08-20
• Subjects: Polymers -- Periodicals; Polymerization -- Periodicals; Synthetic products -- Periodicals; Macromolecules -- Periodicals; 547.7
• DOI: 10.1002/macp.201500209
• Languages: English
• ISSNs: 1022-1352

Abstract

<abstract abstract-type="main" xml:lang="en"> <title> <x xml:space="preserve">Abstract</x> </title> <p>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 propargyl‐terminated polyurethanes with 1, 4‐dibromobutane in the presence of sodium azide. The PUT structures are confirmed by <sup>1</sup>H NMR, Fourier transform infrared (FTIR) spectroscopy, and elemental analysis, and the number‐average molecular weights of PUTs range from (3.74–11.16) × 10<sup>4</sup> g mol<sup>−1</sup>, 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. <graphic position="anchor" mimetype="image" xlink:href="ark:/27927/pgj2n1gbfw3" orientation="portrait" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink" /></p> </abstract>