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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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Published in: | Frontiers of chemical engineering in China 2008-03, Vol.2 (1), p.123-126 |
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Main Authors: | , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites |
Online Access: | Get full text |
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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. |
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ISSN: | 1673-7369 1673-7474 |
DOI: | 10.1007/s11705-007-0078-5 |