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.

我们成功地制备了具有10微米微条纹图案的薄膜，该薄膜的透光率平均保持在90%，并表现出眼睛角度对透光率的依赖。这种微米级的有序结构不是由于微相分离，而是由于光反应过程中的自组织。广泛预期的应用如下：角度调节膜、液晶显示器扩散膜、导光膜。为了提高光透明性能和薄膜厚度，研究了光反应过程中的自组织机理。下面是清晰的发现。(1)中等光照强度下结构形成。(2)在一定浓度的自由基反应引发剂下形成结构。(3)通过微拉曼分析，观察到光化学转化的有序条纹。(4)凝胶化后，光反应最大时结构固定。下面我们通过思考光反应来讨论我们对机理的理解。本文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光的不均匀性。光反应的动力学常数和光强的关系表现为具有拐点的s型函数，该拐点负责将光强分布划分为强场和弱场。

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

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

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

Development of Three-Dimensional Structure Formation Simulator of Colloidal Nan particles during Drying

胶体纳米颗粒干燥过程三维结构形成模拟器的研制

• 发表时间: 2006
• 期刊: Journal of Chemical Engineering of Japan Vol.39, No.1
• 作者: Masahiro Fujita;Yukio Yamaguchi
• 通讯作者: Yukio Yamaguchi