| 학회 | 한국고분자학회 |
| 학술대회 | 2004년 가을 (10/08 ~ 10/09, 경북대학교) |
| 권호 | 29권 2호, p.712 |
| 발표분야 | 분자전자 부문위원회 |
| 제목 | A Novel Organic-Inorganic Hybrid Photopolymer with Enhanced Optical Properties |
| 초록 | Photopolymerizable materials are of considerable interest for the development of holographic data storage devices. A representative photopolymerizable material, photopolymer, usually consists of polymer matrix, photopolymerizable monomer, initiator, and photosensitizer. Exposure of these materials to light initiates a photoreaction that occurs preferentially in regions of constructive interference. After exposure, photopolymer contains a record of the fringe pattern as a spatial variation of its chemical composition accompanied by change of refractive index. Photopolymers are attractive as a promising recording material for the holographic optical data storage due to their relatively large refractive index modulation (Δn=10-2), high sensitivity, and low cost. However, their application to the holographic data storage device is severely limited due to high volume shrinkage during holographic recording. The volume shrinkage is closely associated with entanglement of polymer chains formed during the photopolymerization. Several photopolymer systems include a hybrid organic-inorganic host based on porous glass, organic-inorganic nanocomposites, and the use of monomers capable of cationic ring-opening polymerization. However, these approaches accompany critical demerits including complex synthesis procedures in the cationic ring-opening polymerization-based photopolymer and severe light scattering in the nanoparticle-dispersed nanocomposite-based photopolymer systems. Light scattering seems to be an inevitable phenomenon in these photopolymers because the amount of incorporated nanoparticles reaches 40wt% for obtaining high performance. In this work, we present a novel organic-inorganic hybrid photopolymer in which surface-photoreactive, organically modified silica nanoparticle is incorporated as a comonomer for the photopolymerization. By incorporating the surface-photoreactive nanoparticles as a comonomer, volume shrinkage can be reduced without sacrificing the sensitivity and optical quality of the photopolymer. Optical properties including diffraction efficiency, angular response, and energetic sensitivity will be discussed. This work was supported by a grant (code# : 04K1501-03010) from 'Center for Nanostructured Materials Technology' under '21st Century Frontier R&D Programs' of the Ministry of Sicence and Technology, Korea. |
| 저자 | 김원선1, 정용철2, 박정기2 |
| 소속 | 1한국과학기술원, 2한국과학기술원 생명화학공학과 |
| 키워드 | holographic data storage; photopolymer; organic-inorganic hybrid; volume shrinkage |
