Development of Optical Memory Recording Films using Conjugated Polymers of Polydiacetylenes

本项目的目的是探索利用共轭聚合物的光致异构化，以薄膜的形式，作为一个快速和高密度的光学信息记录的可能性。为此，我们选择了一类特殊的共轭聚合物，聚二乙炔，它是由二乙炔单体通过固相聚合得到的，RC = C-C = CR，其中R代表合适的取代侧基。这些聚合物的一个显著特点是它们的化学和物理性能可以通过改变R的结构而在很大程度上改变。利用这一优点，我们可以通过常规的真空沉积方法制备出较好的聚二乙炔薄膜。与以往的薄膜制备技术相比，本方法具有工艺简单、薄膜质量好、聚合物在薄膜中择优取向的可行性等优点，更适合于在光记录器件中的应用。这些真空沉积膜的各种光学性能的特点。一个重要的发现是光敏化的光致电子注入的有机染料层，如酞菁薄膜，在近红外区域的光致变色薄膜的可能性。研究表明，聚丁二炔薄膜是一种对传统半导体激光器的近红外光具有高速（响应时间为几纳秒）和高分辨率的光记录材料。

The aim of present project is to explore possibility of utilizing the photo-induced isomerization of the conjugated polymers, in the form of thin films, as a fast and high density optical information recording. For this purpose, we have chosen specific class of conjugated polymers, polydiacetylenes, which are obtained by the solid state polymerization from diacetylene monomers, RC=C-C=CR, wher R stands for the suitable sudstitutional side group. A remarkable feature of these polymers is that their chemical and physical properties can be varied to a large extent by modifying the structure of R. Making use of this advantage, we were able to prepare fairly good thin films of polydiacetylenes by means of conventional vacuum deposition method. As compared with previous film fabrication technigues, the present method is more suitable for the application to optical recording devices, for the simplicity, the film guality , as well as the feasibility of preferential alignment of polymers in the film. Various optical properties of these vacuum deposited films have been characterized. An important finding is the possibility of sensitization of photochromism in the near infrared region by the photo-induced electron injection from an organic dye layer, such as phthalocyanine film, to the polydiacetylene films. It has been proved by this study that polydiacetylene films are useful for high speed ( with the response time of a few nsecond) and high resolution optical recording material for the near infrared light obtained from a conventional semiconductor laser.