Preparation of Holographic Gratings of Liquid Crystals Dispersed in Polyurethane Acrylates under Controlled Reaction Conditions | Zendy

Kim Eun Hee | Zendy; Kim Byung Kyu | Zendy

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Preparation of Holographic Gratings of Liquid Crystals Dispersed in Polyurethane Acrylates under Controlled Reaction Conditions

Author(s) -

Kim Eun Hee,

Kim Byung Kyu

Publication year - 2006

Publication title -

chemphyschem

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.016

H-Index - 140

eISSN - 1439-7641

pISSN - 1439-4235

DOI - 10.1002/cphc.200600272

Subject(s) - polyurethane , diffraction efficiency , materials science , polymer , holography , holographic grating , grating , liquid crystal , chemical engineering , kinetics , doping , diffraction , shrinkage , saturation (graph theory) , diffraction grating , optics , composite material , optoelectronics , physics , mathematics , engineering , quantum mechanics , combinatorics

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.

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