The Azobenzene Optical Storage Puzzle – Demands on the Polymer Scaffold?
The Azobenzene Optical Storage Puzzle – Demands on the Polymer Scaffold?
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偶氮苯光存储难题——对聚合物支架的需求？
DOI：
10.1007/s007060170143
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发表时间：
2001
期刊：
影响因子：
--
通讯作者：
P. Ramanujam
中科院分区：
文献类型：
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作者：
S. Hvilsted;P. Ramanujam
简要介绍了利用偶氮苯光寻址部分进行光信息存储的基本机理。在规则间隔的侧链中共价结合氰基偶氮苯的合成柔性聚酯基质特别适合于全息存储。液晶聚酯薄膜材料的显着优点是：对激光的响应时间为ns量级，存储容量为5000线/mm，永久（八年以上）衍射效率为50%或更高量级，以及可擦除性。主链的性质对聚酯形态和永久性的诱导各向异性的影响进行了讨论。阐明了支持氰基偶氮苯的其他非常不同的聚合物支架的设计和制备方法的论点。尽管寡肽总是形成无定形材料，但共聚甲基丙烯酸酯和树枝状或超支化聚酯都提供了一些表现出液晶性的材料。然而，这些其他支架都没有提供允许激光诱导的持久各向异性的材料。
The basic mechanism of optical information storage utilizing the azobenzene photoaddressable moiety will briefly be introduced. A synthetically flexible polyester matrix covalently integrating cyanoazobenzene in regularly spaced side chains is particularly well suited for holographic storage. Notable figures of merits of thin film materials of liquid crystalline polyesters are: response time to laser light in the order of ns, storage capacity of 5000 lines/mm, high permanent (more than eight years) diffraction efficiency in the order of 50% or higher, and erasability. The implications of the nature of the main chain on polyester morphology and on the permanency of the induced anisotropy are discussed. Arguments for the design and methods of preparation of other very different polymer scaffolds supporting the cyanoazobenzene are elucidated. Whereas oligopeptides invariably form amorphous materials, both copolymethacrylates and dendritic or hyperbranched polyesters provide some materials that exhibit liquid crystallinity. However, none of these other scaffolds offer materials that allow long-lasting anisotropy to be laser light induced.