✦ LIBER ✦
Preparation of Holographic Gratings of Liquid Crystals Dispersed in Polyurethane Acrylates under Controlled Reaction Conditions
✍ Scribed by Eun Hee Kim; Byung Kyu Kim
- Publisher
- John Wiley and Sons
- Year
- 2006
- Tongue
- English
- Weight
- 360 KB
- Volume
- 7
- Category
- Article
- ISSN
- 1439-4235
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✦ Synopsis
Abstract
Transmission gratings of holographic polymer‐dispersed liquid crystals (HPDLC) are prepared under controlled reaction conditions by adding various amounts of chain‐transfer agent (CTA). The resulting films have a higher gel content with lower cross‐link density, less dark reaction, less grating shrinkage with much smoother LC/polymer interfaces, smaller induction period, and fast saturation of diffraction efficiency, which shows a maximum of 95 % with 1 % CTA. An optimum LC content of 35 % is verified on the basis of morphology and reaction kinetics.