新穎聚醯亞胺與壓克力高分子/二氧化鈦 混成光學膜

Abstract

有機無機混成材料具有結合其組成物質的特性而產生新功能性材料之潛力。在混成材料中，二氧化鈦扮演著重要的奈米微粒且其擁有許多特別的光學性質，如高折射率，然而製備感光性高分子二氧化鈦混成光學膜尚待研究。在此論文中，主要在設計及合成新感光性聚醯亞胺混成二氧化鈦材料與熱交聯的壓克力高分子混成二氧化鈦材料，並探討其光學及其他物理特性。 論文首先研究探討高折射率又有光敏感性的聚醯亞胺混成二氧化鈦材料。此材料由有壓克力官能基修飾的聚醯亞胺和二氧化鈦前趨物利用酯化反應所合成出來，由羧酸和二氧化鈦的比例，酸的含量，水的多寡，混合的溶劑，等等因素控制可得均勻成一相的混成材料。且所得薄膜具有可寬廣調變的折射率範圍（n = 1.58∼2.03），良好的熱性質，且在可見光區具有很高的穿透度。而且此材料可以沖洗出Y字形的圖案，其線與線的間距大約50微米。 其次探討熱交聯的壓克力高分子二氧化鈦混成材料，此材料乃由有壓克力官能基修飾的二氧化鈦前趨溶液和壓克力單體混成，再經由多步驟的熱交聯所製備。而所製備的混成薄膜具有的折射率範圍大約在n = 1.50∼1.73。且其也具有平滑的表面和在可見光區有良好的穿透度。所研究之高分子二氧化鈦混成材料具有優良的光學特性，可在光電元件，如抗反射膜，光波導等方面具應用潛力。

Organic-inorganic hybrid materials could combine the unique properties of organic and inorganic components to form new functional materials. Among hybrid materials, titania presents the important nanobuilding block and possess several unique optical properties, such as high refractive index. In this thesis, new hybrid optical films of polyimide or polyacrylate–titania hybrid materials were studied for optical applications. New high refractive index polyimide–titania hybrid materials were synthesized and characterized. A soluble polyimide grafted photosensitive methacrylate was first synthesized from 4,4’-(hexafluoroisopropylidene) diphthalic anhydride (6FDA), 3,5-diaminobenzoic acid (DABA), 4-aminobenzoic acid (4ABA), and 2-hydroxyethyl methacrylate. Then, the remaining COOH could undergo an esterification reaction with titanium butoxide and provide organic–inorganic bonding to obtain a homogeneous hybrid solution. Then, it was spin-cast into thin films and cured to obtain the hybrid films. These hybrid films possess a wide range of tunable refractive index (n=1.58-2.03), excellent thermal properties, and good transparency in visible range. Besides, they could be also developed to a Y-shape channel patterns with 50 line width. In the second topic of this thesis, thermal curable polyacrylate–titania hybrid materials were synthesized and characterized. First, precursor solution was prepared from methacrylate modified titania precursors and methacryalte monomer mixture. Then, the precursor solution was spin-cast to thin films and followed by multi-step theraml curing process to obtain the hybrid films. The prepared hybrid films poseess tunable and high refractive index (n=1.50-1.73), good surface uniformity and optical transparency in the visible range.