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研究生: 吳書慧
Shu-Hui Wu
論文名稱: 聚乙烯醇掺混量對高分子分散型微膠囊化液晶物性之影響
The physical property studies of Polymer Dispersed Micro-encapsulated Liquid Crystal based on Polyvinyl Alcohol content
指導教授: 李俊毅
Jiunn-Yih Lee
口試委員: 邱顯堂
Hsien-Tang Chiu
邱士軒
shin-hsuan chiu
王英靖
none
學位類別: 碩士
Master
系所名稱: 應用科技學院 - 醫學工程研究所
Graduate Institute of Biomedical Engineering
論文出版年: 2010
畢業學年度: 98
語文別: 中文
論文頁數: 75
中文關鍵詞: 高分子分散型微膠囊化液晶
外文關鍵詞: Micro-encapsulated Liquid Crystal
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  • 高分子分散液晶(Polymer Dispersed Liquid Crystal;PDLC)中之高分
    子含量高則成本低,含量高則遮蔽性不足,在技術上要控制液晶顆粒(Liquid
    Crystal droplet)之形成是非常困難的,然而本文所用之高分子分散微膠囊化
    液晶(Polymer Dispersed Micro-encapsulation Liquid Crystal;PDMLC)因為型
    態固定,所以可以任意改變高分子含量,而不影響液晶顆粒之圓球形狀及其
    大小,微膠囊化液晶/PVA 之比例由1.0/1.5~9.0 由低往高含量增加配置塗佈
    出的試片中,發現比例超過6.0 以上即試片對光的遮蔽效果變差,比例在
    5.0~6.0 之間測出之光電性,其驅動電壓可在25V,改善一般PDLC 的高驅
    動電壓的問題,且有效降低高成本液晶之使用量。


    In general, the higher polymer content in the polymer dispersed liquid
    crystal lead to cost competitively, but the opacity of PDLC film will be relatively lower with field-off. It is difficult to control the droplet size and shape of LC in the polymer matrix by phase separation condition. In this article we use the micro-encapsulation technology to form the polymer dispersion microencapsulated LC (PDMLC) formulations which have similar droplet size and shape of LC. This approach is easy to adjust the polymer content, and no influence on the droplet size and shape of LC. We adjust the ratio of polymer (PVA) content (form 1.5 to 9.0) to find the optimal optical property. Finally, the results indicate that the ratio of polymer content between 5.0 and 6.0, the driving voltage can drop down to 25V. If the ratio of polymer content is larger than 6.0,the opacity of PDLC film will become lower.

    摘要...........................................................I ABSTRACT.......................................................II 目錄...........................................................III 圖索引.........................................................VI 第1章 諸論.....................................................1 1-1 可調光液晶玻璃之構造及原理 ................................2 1-1-1 可調光液晶玻璃之構造.....................................2 1-1-2 可調光液晶玻璃之原理.....................................3 1-2 液晶的發現.................................................6 1-3 液晶的分類.................................................8 1-3-1 棒狀液晶相(Rod-like mesophases).........................10 1-3-2 盤狀液晶相(discotic mesophases).........................14 1-4 液晶的物理性質.............................................15 1-4-1 分子排列的秩序參數.......................................15 1-4-2 液晶的彈性連續體理論.....................................16 1-4-3 液晶的光電特性...........................................18 1-5 聚乙烯醇(Polyvinyl Alcohol)..............................24 1-5-1 聚乙烯醇的簡介...........................................24 1-5-2 聚乙烯醇的特性...........................................26 1-5-3 聚乙烯醇主要產品與規格...................................29 1-5-4 聚乙烯醇的分子量與平均聚合度.............................31 1-5-5 聚乙烯醇的溶解和使用方法.................................33 1-6 研究動機與目的.............................................35 第2 章 實驗方法................................................37 2-1 實驗材料與設備.............................................37 2-1-1 實驗材料.................................................37 2-1-2 實驗設備.................................................38 2-2 試片製作流程...............................................39 2-3 微膠囊化液晶/PVA 摻混比例..................................40 2-4 實驗製作流程圖.............................................41 2-5 乳液混合攪拌之前置作業.....................................42 2-5-1 PDMLC 母液...............................................42 2-5-2 PVA 純化系統.............................................43 2-6 接著強度之量測.............................................45 2-7 光學之量測.................................................46 2-7-1 透光度之測量.............................................46 2-7-2 霧度之測量...............................................48 第3 章 結果與討論..............................................50 3-1 PDMLC 粒徑分析.............................................50 3-2 PDMLC 膜之接著強度.........................................53 3-3 PDMLC 膜之光電性及霧度.....................................59 第4 章 結論....................................................72 第5 章 未來展望................................................73 參考文獻.......................................................74

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    台灣科技大學纖維及高分子工程所

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