Bandwidth-controllable reflective cholesteric gels from photo- and thermally-induced processes

Renwei Guo Department of Materials Physics and Chemistry, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083, P.R. China

Hui Cao Department of Materials Physics and Chemistry, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083, P.R. China

Chaoyong Yang Shaanxi Applied Physical Chemistry Institute, Shaanxi, Xian, 710061, P.R. China

Xiaojuan Wu Department of Materials Physics and Chemistry, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083, P.R. China

Qingyong Meng Department of Materials Physics and Chemistry, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083, P.R. China

Tao Liu Department of Materials Physics and Chemistry, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083, P.R. China

Wanli He Department of Materials Physics and Chemistry, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083, P.R. China

Zihui Cheng Department of Materials Physics and Chemistry, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083, P.R. China

Huai Yang Department of Materials Physics and Chemistry, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083, P.R. ChinaCorrespondence[email protected]

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Abstract

A bandwidth-controllable reflective gel has been investigated from photo- and thermally-induced processes. Due to the pitch of cholesteric liquid crystal (CLC) composite increasing as the temperature rises, the CLC with short pitch is frozen by UV-curing the polymer network at low temperature and the CLC with long pitch is fixed by heat curing the polymer network at high temperature. A non-uniform pitch distribution of CLCs forms in the gel when temperature becomes low. It is demonstrated that the memory effect of the polymer network is an important mechanism for the resulting gel.

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Acknowledgements

This work was supported by Flat-Panel Display Special Project of China 863 Plan (Grant No. 2008AA03A318), National Natural Science Foundation (Grant No. 50973010), National Natural Science Foundation (Grant No. 20674005) and Projects of Chinese National Science Tackling Key Problems (Grant No. 2007BAE31B02).

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Bandwidth-controllable reflective cholesteric gels from photo- and thermally-induced processes

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Bandwidth-controllable reflective cholesteric gels from photo- and thermally-induced processes

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