Broadband reflection in polymer stabilized cholesteric liquid crystal films with stepwise photo-polymerization
| Autor: | Li Erli, Dong Wang, Huihui Wang, Hui Cao, Zhou Yang, Wanli He, Wu Yong, Duan Manyu, Huai Yang |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
chemistry.chemical_classification
Materials science Dopant Polymer network Cholesteric liquid crystal business.industry Scanning electron microscope General Physics and Astronomy 02 engineering and technology Polymer 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Optics chemistry Polymerization Broadband Ultraviolet light Optoelectronics Physical and Theoretical Chemistry 0210 nano-technology business |
| Zdroj: | Physical chemistry chemical physics : PCCP. 19(3) |
| ISSN: | 1463-9084 |
| Popis: | In this study, we demonstrate a novel method for fabricating polymer stabilized cholesteric liquid crystal (PSCLC) films with non-uniform pitch distribution by utilizing two kinds of photo-induced processes. Based on the large HTP temperature dependence of a chiral dopant, polymer networks were formed at two distant temperature points in sequence. The influence of the polymerization conditions on the reflectance properties of PSCLCs before and after polymerization was investigated. The results strongly suggest that the location and bandwidth of the reflection band can be controlled preferably by adjusting the ultraviolet light intensity and irradiation time of UV-light. In addition, the morphology of the polymer network in the composites was studied using scanning electron microscopy (SEM). A general correlation between polymerization conditions, the network morphology, and the reflective region will be outlined. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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