Mechanism of Self-organized micro structures during Photoreaction

光反应过程中自组织微结构的机制

• 批准号: 16360391
• 负责人: YAMAGUCHI Yukio
• 金额: $ 9.66万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2004
• 资助国家: 日本
• 起止时间: 2004 至 2005
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-16360391/
• 关键词: self-organization; photoreaction; stripped pattern; positive feedback; initiator of polymerization; light intensity distribution; micro-gel; light transparency; フィードバック; 光重合; 構造形成; 架橋反応; ラマンスペクトル; 顕微ラマン; 光学顕微鏡; CCDカメラ

We have succeeded to fabricate the thin films having micro stripped patterns of 10 micron which show eye-angle dependency on light transparency with keeping 90 % light transparency as average. This micron order structure is not due to micro phase separation but due to self-organization during photoreaction. The applications are widely expected as following ; eye-angle regulated films, diffusion films of liquid crystal displays, and light guiding films. In order to improve the performance of light transparency and thinner films, the mechanism of self-organization during photoreaction has been studied. The followings are clearly found.(1)The structure formation takes place under moderate light intensity.(2)The structure formation takes place under a certain concentration of radical reaction initiator.(3)The ordered stripped patterns with modulation of photoreaction conversion are observed by the analysis of micro Raman.(4)The structures are fixed at maximum of photoreactions after becoming gel.Our understanding of the mechanism is discussed below by thinking the photoreaction. The most realistic mechanism proposed here was that micro gels produced by photoreaction enhance the inhomogeneous light intensity because of light scattering. The kinetic constant of photoreaction in terms of light intensity shows a sigmoid function having an inflection point which is responsible for splitting the light intensity distribution into strong and weak fields.

我们成功地制造了具有 10 微米微条纹图案的薄膜，该薄膜表现出对光透明度的眼角依赖性，并保持平均 90% 的光透明度。这种微米级结构不是由于微相分离，而是由于光反应过程中的自组织。广泛期待的应用如下：眼角调节膜、液晶显示器扩散膜、导光膜。为了提高光透明度和更薄的薄膜的性能，人们对光反应过程中的自组织机制进行了研究。清楚地发现：(1)在中等光强下发生结构形成。(2)在一定浓度的自由基反应引发剂下发生结构形成。(3)观察到光反应转化率调制的有序条纹图案(4)凝胶化后，在光反应最大时结构被固定。下面通过思考光反应来讨论我们对其机理的理解。这里提出的最现实的机制是光反应产生的微凝胶由于光散射而增强了不均匀的光强度。就光强度而言，光反应的动力学常数显示出具有拐点的 S 型函数，该拐点负责将光强度分布分为强场和弱场。

项目成果

光制御性を有する重合体の製造方法および該製造法により得られる重合体を用いた光制御フィルムまたはシート

具有光控制性的聚合物的制造方法以及使用由该制造方法得到的聚合物的光控制膜或片材

• 发表时间: 2004

Self-organization of striped pattern of refractive indices in photo polymer film

光聚合物薄膜中折射率条纹图案的自组织

• 发表时间: 2004
• 期刊: Journal of Polymer Science Part B-Polymer Physics 42(18)
• 作者: Takafumi Uematsu;Akira Watanabe;Yukio Yamaguchi
• 通讯作者: Yukio Yamaguchi

Self-Organization of Striped Pattern of Refractive Indices in Photopolymer Film

光聚合物薄膜中折射率条纹图案的自组织

• 发表时间: 2004
• 期刊: Journal of Polymer Science Vol.42
• 作者: Takafumi Uematsu;Akira Watanabe;Yukio Yamaguchi
• 通讯作者: Yukio Yamaguchi

Effects of Particle Size on the Monolayer Structure of Nanoparticles Formed via a Wet-Coating Process

粒径对湿法涂覆工艺形成的纳米粒子单层结构的影响

• 发表时间: 2005
• 期刊: Journal of Chemical Engineering of Japan Vol.38 No,8
• 作者: Hiroyuki Nishikawa;Kazumasa Morozumi;Minghui Hu;Toru Okubo;Masahiro Fujita;Yukio Yamaguchi;Tatsuya Okubo
• 通讯作者: Tatsuya Okubo

Angular Dependence in the Transmittance from Self-Organized Striped Pattern of Refractive Indices in Photopolymer

光聚合物中折射率自组织条纹图案的透射率的角度依赖性

• 发表时间: 2002
• 期刊: Journal of Polymer Science Vol.40
• 作者: Takafumi Uematu;Shinya Maenosono;Yukio Yamaguchi
• 通讯作者: Yukio Yamaguchi