含環氧乙烷及側取代三苯液晶基側鏈之聚-(2,3-雙苯基-1,4-仲苯基乙烯)之合成及光電性量測

Abstract

本研究主要目的在於探討新穎發光高分子材料之合成及其在光電性質方面的應用。第一部份為聚-(2,3-雙苯基-1,4-仲苯基乙烯) (DP-PPV) 側鏈接上聚環氧乙烷之合成、光電性質研究及透過溶膠-凝膠製程研究其自組裝之奈米複合材料。第二部份為合成DP-PPV側鏈接上三苯基液晶基高分子並探討其高分子偏極化上之應用。 第一部份共合成出三種含聚環氧乙烷基側取代之DP-PPV衍生物。首先合成具有雙苯環聚環氧乙烷基之單體，再利用Gilch聚合法來聚合高分子。其中P1聚合分子量可達到19萬，在電激發光元件方面亮度為677cd/m2，在溶膠-凝膠製程研究方面，透過高分子與矽源(TEOS)反應形成奈米複合材料，我們選用了兩種方法製備在不同溶劑極性以及不同酸鹼性下，本研究製備出兩種不同的奈米複合結構分別為微胞狀以及六角柱狀，結果顯示可以利用溶劑以及酸鹼性質不同來操控奈米複合材料之結構以及形態。第二部份共合成出三種含三苯基液晶側取代之DP-PPV衍生物作為偏極化用，使用Gilch聚合法來聚合高分子。偏極化光學性質方面，從實驗結果我們可以的得知平行方向的強度大於垂直方向的強度，表示發光基團的排列方向皆與定向摩擦方向相同。

The goal of this research is to study the synthesis and application of new light-emitting polymers. The first part of this study is focused on the synthesis and electro-optical properties and of poly(2,3-diphenyl-1,4-phenylene vinylene) (DP-PPV) containing polyethylene oxide side chains. The formation meso-structure nanocomposites by sol-gel process with tetraethyl ortho-silicate(TEOS) was demonstrated .The second part is to study the synthesis of poly(2,3-diphenyl-1,4-phenylene vinylene)s (DP-PPVs) containing triphenylene liquid crystal side groups and their application in polarized emission. In the first part, three kinds of DP-PPV derivatives containing polyethylene oxide side chains were synthesized. The monomers which contain polyethylene oxide were polymerized via Gilch-route to yield DP-PPV conjugated polymers. Among three polymers P1 showed a high EL brightness 677cd/m2. The formation meso-structure nanocomposites by sol-gel process with tetraethyl ortho-silicate was demonstrated .We fabricated two different nano structures by changing solvent polarity and pH value. Two different nano structures such as micelle and hexagonal phase was obtained.In the second part, three kinds of DP-PPV containing triphenyl liquid crystal side groups were synthesized. The monomers which contain a triphenyl side group were polymerized via Gilch-route to yield DP-PPV conjugate polymers. The results indicate that the absorbance parallel to the rubbing direction is much higher than that perpendicular to the rubbing direction, which means that the mesogens are aligned parallel to the rubbing direction.