Frontiers of Chemical Science and Engineering >

2008 , Vol. 2 >Issue 1: 123 - 126

DOI: https://doi.org/10.1007/s11705-007-0078-5

Hyperbranched azo polyurethane synthesized through A + B scheme

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  • Department of Chemical Engineering, Laboratory for Advanced Materials, Tsinghua University

Published date: 05 Mar 2008

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Abstract

A hyperbranched azo polyurethane was synthesized by one-step polymerization of an A2 type monomer diphenylmethane-4,4′-diisocyanate and a B3 type monomer 4-(N,N′-bis(2-hydroxyethyl))amino-2′-hydroxyethoxyl-4′-nitro-azobenzene. The azo polymer was characterized by 1H nuclear magnetic resonance (NMR), ultraviolet-visible (UV-Vis) spectrum and thermal analysis. The ?max of the polymer in dimethylformamide (DMF) solution is 488 nm. The number average molecular weight (Mn) determined by GPC is 9,300 with a polydispersion index 1.9. The glass transition temperature (Tg) of the polymer is 131°C observed from DSC thermogram. The results show that the azo polyurethane has been successfully synthesized through this scheme. Surface-relief-gratings (SRGs) were fabricated on the polymer film after being irradiated by interference pattern of Ar+ laser beams for 1,000 s. The surface modulation depth and the grating space period measured by AMF are 67 and 770 nm, respectively.

Cite this article

CHE Pengchao, HE Yaning, WANG Xiaogong . Hyperbranched azo polyurethane synthesized through A + B scheme[J]. Frontiers of Chemical Science and Engineering, 2008 , 2(1) : 123 -126 . DOI: 10.1007/s11705-007-0078-5

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