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The Study on Nonlinear Optical Properties in Superstructure Controlled Polymer-Dye (Guest-Host) Systems

超结构控制聚合物染料（客体-主体）体系非线性光学性质的研究

基本信息

批准号：
02452073
负责人：
MIYATA Seizo
金额：
$ 3.71万
依托单位：
Tokyo University of Agriculture and Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1990
资助国家：
日本
起止时间：
1990 至 1991
项目状态：
已结题

项目摘要

Nonlinear optical(NLO)properties of poled polymers are currently in the focus of intense scientific and technological interest. It is well known that introduction of a preferred chromophore orientation in a medium can create a useful second-order NLO materials. Since most of the NLO molecules have appreciable static electric dipole moments, these molecules can be aligned by an electric field above glass transition temperature of host polymers. Then, oriented molecules is cooled down and freezing in the preferred alignment. A general problem of poled polymers is the decay of their nonlinear optical coefficients due to local relaxation process of polymer side chains. In order to improve this problem, novel preparation method of SHG active P-nitroaniline(PNA)was proposed. Although Poly(epsilon -caprolactone)(PCL)and PNA do not individually exhibit any second harmonic generation(SHG)because their centrosymigetric crystal structure, but a mixture of both shows highly efficient SHG activity. … More This system spontaneously forms an acentric molecular orientation even without the application of an electric field. A strong SHG could be observed from the sample which contained huge spherulites. The pNA/PCL system shows a typical eutectic phase diagram : having only one phase in the liquid and two phases in the solid state. The pNA and PCL are miscible in a molten state due to the hyderogen bondings between amino and ester groups. If there is no interaction between guest and host, such as pNA and poly (ethylene) the phase is separated in the molten state and exhibit no SHG activity after crystallization. In order to get highly alligned PNA crystals, it is necessary to control the formation of nucleus. When the film was scratched before crystallization, the formation of nucleus start from the each scratched point and grows perpendicular to the scratched line. This kind of crystal growth is well known as transcrystal. The obtained value of d, 33 is almost as high as dll of 2-methyl-4-nitroaniline. Furthermore, the long term stability of this system doesn't decay for more than 1 year. Thus pNA/PCL systems offer a number of potential advantages to future technology. Less

极化聚合物的非线性光学性质是当前科学技术研究的热点。众所周知，在介质中引入优选的发色团取向可以产生有用的二阶非线性光学材料。由于大多数非线性光学分子具有可观的静电偶极矩，这些分子可以通过高于主体聚合物的玻璃化转变温度的电场进行取向。然后，定向的分子被冷却并冻结在优选的排列中。极化聚合物的一个普遍问题是由于聚合物侧链的局部弛豫过程导致其非线性光学系数的衰减。为了解决这一问题，提出了一种制备二次谐波活性对硝基苯胺（PNA）的新方法。虽然聚（ε-己内酯）（PCL）和PNA由于它们的中心对称晶体结构而不单独表现出任何二次谐波产生（SHG），但两者的混合物显示出高效的SHG活性。 ...更多信息该系统自发地形成一个偏心分子取向，即使没有施加电场。在含有大球晶的样品中可以观察到较强的二次谐波。pNA/PCL系统显示出典型的共晶相图：在液体中只有一个相，在固态中有两个相。pNA和PCL由于氨基和酯基之间的氢化物键合而在熔融状态下是可混溶的。如果客体和主体之间没有相互作用，例如pNA和聚（乙烯），则相在熔融状态下分离，并且在结晶后不表现出SHG活性。为了获得高配位比的PNA晶体，必须控制成核。在晶化前对薄膜进行划痕处理，晶核的形成从划痕处开始，并垂直于划痕线生长。这种晶体生长被称为横晶。得到的d，33值几乎与2-甲基-4-硝基苯胺的dll一样高。此外，该系统的长期稳定性不衰减超过1年。因此，pNA/PCL系统为未来技术提供了许多潜在的优势。少