SURFACE-RELIEF-GRATING FORMATION BEHAVIOR OF TWO HYPERBRANCHED AZO POLYMERS

Peng-chao Che; Ya-ning He; Xiao-gong Wang

doi:10.1007/s10118-012-1142-2

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SURFACE-RELIEF-GRATING FORMATION BEHAVIOR OF TWO HYPERBRANCHED AZO POLYMERS

PAPER | Updated：2023-01-03

- SURFACE-RELIEF-GRATING FORMATION BEHAVIOR OF TWO HYPERBRANCHED AZO POLYMERS
- Chinese Journal of Polymer Science Vol. 30, Issue 3, Pages: 478-486(2012)
- Affiliations：
  
  Laboratory for Advanced Materials, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
- Author bio：
  
  *Xiao-gong Wang (王晓工), E-mail: wxg-dce@mail.tsinghua.edu.cn
- Funds：
- DOI：10.1007/s10118-012-1142-2
  CLC：
- Received：07 November 2011，
  
  Revised：2011-12-20，
  
  Accepted：23 December 2011，
  
  Published：2012-05
- Accepted：
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Peng-chao Che, Ya-ning He, Xiao-gong Wang. SURFACE-RELIEF-GRATING FORMATION BEHAVIOR OF TWO HYPERBRANCHED AZO POLYMERS[J]. Chinese Journal of Polymer Science, 2012, 30(3): 478-486.
DOI：

Peng-chao Che, Ya-ning He, Xiao-gong Wang. SURFACE-RELIEF-GRATING FORMATION BEHAVIOR OF TWO HYPERBRANCHED AZO POLYMERS[J]. Chinese Journal of Polymer Science, 2012, 30(3): 478-486. DOI： 10.1007/s10118-012-1142-2.

摘要

Abstract

In this work

surface-relief-grating formation behavior was studied by using two hyperbranched azo polymers. The hyperbranched polymers containing pseudo-stilbene type azo chromophores throughout the hyperbranched structure were synthesized by step-growth polycondensation of AB

type monomers. The AB

monomer

4-(4′-(bis(2-chloroethyl)amino)-phenylazo)benzoic acid (BAA)

was prepared through azo-coupling reaction between

′-bis(2-chloroethyl)aniline and 4- aminobenzenic acid. The another AB

monomer

4-(4′-(bis(2-chloroethyl)amino)phenylazo)-3-nitro-benzoic acid (BANA)

was prepared through azo-coupling reaction between

-bis(2-chloroethyl)aniline and 3-nitro-4-aminobenzenic acid. The hyperbranched polymers (PBAA and PBANA) were prepared through nucleophilic substitution reaction of BAA and BANA

respectively. The polymers synthesized were characterized by using spectroscopic methods and thermal analysis. The photoinduced dichroism and photo-induced surface-relief-grating (SRG) formation of the hyperbranched polymers were investigated upon irradiation with Ar

laser at 488 nm. PBAA shows typical photoinduced dichroism SRG formation behavior. On the contrary

PBANA does not show the photoresponsive properties. The results indicate that the nitro at the ortho position of azo group of PBANA shows the effect of inhibiting the photoinduced variations. The effect can be attributed to the blockage of the

trans-cis

isomerization of the azobenzene moieties by the steric hindrance.

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