A TEMPERATURE AND pH DOUBLE SENSITIVE CHOLESTERIC POLYMER FILM FROM A PHOTOPOLYMERIZABLE CHIRAL HYDROGEN-BONDED ASSEMBLY

Feng-jin Chen; Jin-bao Guo; Ou-yu Jin; Jie Wei

doi:10.1007/s10118-013-1244-5

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A TEMPERATURE AND pH DOUBLE SENSITIVE CHOLESTERIC POLYMER FILM FROM A PHOTOPOLYMERIZABLE CHIRAL HYDROGEN-BONDED ASSEMBLY

PAPER | Updated：2023-01-03

- A TEMPERATURE AND pH DOUBLE SENSITIVE CHOLESTERIC POLYMER FILM FROM A PHOTOPOLYMERIZABLE CHIRAL HYDROGEN-BONDED ASSEMBLY
- Chinese Journal of Polymer Science Vol. 31, Issue 4, Pages: 630-640(2013)
- Affiliations：
  
  College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China
- Author bio：
  
  **Jin-bao Guo (郭金宝), E-mail: guojb@mail.buct.edu.cn
  Jie Wei (魏杰), E-mail: weij@mail.buct.edu.cn
- Funds：
- DOI：10.1007/s10118-013-1244-5
  CLC：
- Received：05 June 2012，
  
  Revised：2012-08-16，
  
  Accepted：29 August 2012，
  
  Published：2013-04
- Accepted：
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Feng-jin Chen, Jin-bao Guo, Ou-yu Jin, et al. A TEMPERATURE AND pH DOUBLE SENSITIVE CHOLESTERIC POLYMER FILM FROM A PHOTOPOLYMERIZABLE CHIRAL HYDROGEN-BONDED ASSEMBLY[J]. Chinese Journal of Polymer Science, 2013, 31(4): 630-640.
DOI：

Feng-jin Chen, Jin-bao Guo, Ou-yu Jin, et al. A TEMPERATURE AND pH DOUBLE SENSITIVE CHOLESTERIC POLYMER FILM FROM A PHOTOPOLYMERIZABLE CHIRAL HYDROGEN-BONDED ASSEMBLY[J]. Chinese Journal of Polymer Science, 2013, 31(4): 630-640. DOI： 10.1007/s10118-013-1244-5.

摘要

Abstract

In this study

a novel H-bonded cholesteric polymer film responding to temperature and pH by changing the reflection color was fabricated. The H-bonded cholesteric polymer film was achieved by UV-photopolymerizing a cholesteric liquid crystal (Ch-LC) monomers mixture containing a photopolymerizable chiral H-bonded assembly (PCHA). The cholesteric polymer film based on PCHA can be thermally switched to reflect red color from the initial green/yellow color as temperature is increased

which is due to a change in helical pitch induced by the weakening of H-bonded interaction in the polymer film. Additionally

the selective reflection band (SRB) of the cholesteric polymer film in solution with pH

7 showed an obvious red shift with increasing pH values. While the SRB of the cholesteric polymer film in solutions with pH = 7 and pH

7 hardly changed. This pH sensitivity in solutions with pH

7 could be explained by the breakage of H-bonds in the cholesteric polymer film and the structure changes induced by —OH

−

and —K

ions in the alkaline solution. In contrast

it couldn't happen in the neutral and acidic solutions. The cholesteric polymer film in this study can be used as optical/photonic papers

optical sensors and LCs displays

etc

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