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Hyperbranched azo polyurethane synthesized through A2+B3 scheme

A hyperbranched azo polyurethane was synthesized by one-step polymerization of an A 2 type monomer diphenylmethane-4,4′-diisocyanate and a B 3 type monomer 4-(N,N′-bis(2-hydroxyethyl))amino-2′-hydroxyethoxyl-4′-nitro-azobenzene. The azo polymer was characterized by 1 H nuclear magnetic resonance (NM...

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Bibliographic Details
Published in:Frontiers of chemical engineering in China 2008-03, Vol.2 (1), p.123-126
Main Authors: Che, Pengchao, He, Yaning, Wang, Xiaogong
Format: Article
Language:English
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Summary:A hyperbranched azo polyurethane was synthesized by one-step polymerization of an A 2 type monomer diphenylmethane-4,4′-diisocyanate and a B 3 type monomer 4-(N,N′-bis(2-hydroxyethyl))amino-2′-hydroxyethoxyl-4′-nitro-azobenzene. The azo polymer was characterized by 1 H nuclear magnetic resonance (NMR), ultraviolet-visible (UV-Vis) spectrum and thermal analysis. The λ max of the polymer in dimethylformamide (DMF) solution is 488 nm. The number average molecular weight (M n ) determined by GPC is 9,300 with a polydispersion index 1.9. The glass transition temperature ( T g ) 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.
ISSN:1673-7369
1673-7474
DOI:10.1007/s11705-007-0078-5