偶氮苯
聚苯乙烯
材料科学
全息术
发色团
聚合物
玻璃化转变
光致变色
全息数据存储
衍射效率
化学工程
高分子化学
光化学
光学
复合材料
光电子学
化学
纳米技术
栅栏
物理
工程类
作者
Hubert Audorff,Roland Walker,Lothar Kador,Hans‐Werner Schmidt
标识
DOI:10.1002/chem.201100941
摘要
This paper reports on the synthesis and the thermal and optical properties of photochromic low-molecular-weight compounds, especially with respect to the formation of holographic volume gratings in the pure materials and in binary blends with polystyrene. Its aim is to provide a basic understanding of the holographic response with regard to the molecular structure, and thus to show a way to obtain suitable rewritable materials with high sensitivity for holographic data storage. The photoactive low-molecular-weight compounds consist of a central core with three or four azobenzene-based arms attached through esterification. Four different cores were investigated that influence the glass transition temperature and the glass-forming properties. Additional structural variations were introduced by the polar terminal substituent at the azobenzene chromophore to fine-tune the optical properties and the holographic response. Films of the neat compounds were investigated in holographic experiments, especially with regard to the material sensitivity. In binary blends of the low-molecular-weight compounds with polystyrene, the influence of a polymer matrix on the behavior in holographic experiments was studied. The most promising material combination was also investigated at elevated temperatures, at which the holographic recording sensitivity is even higher.
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