Citation: Feng-jin Chen, Jin-bao Guo, Ou-yu Jin, Jie Wei. 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 shu

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

Received Date: 5 June 2012
Revised Date: 29 August 2012

Fund Project: The work was financially supported by the National Natural Science Foundation of China (No. 50903004).

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.
- Cholesteric polymer film
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