奈米複合材料及光電高分子之合成與性質研究

Synthesis and Characterization of nanocomposites and electro-optic polymers

張家倫(Chia-Lun Chang)

指導教授 ： 廖義田

國立臺北科技大學/工程學院/有機高分子研究所/碩士(2009年)

摘要

導電高分子具有獨特的光電性質與半導體特性，成為目前熱門的高分子光電材料，其應用廣泛如：有機發光二極體、有機場效電晶體、電致變色材料、太陽能電池等。
第一部份 將噻吩接上矽氧烷之側鏈基，由於噻吩本身是溫變色分子，且矽氧烷具有較低的玻璃轉移溫度，因此本實驗利用化學氧化法及電化學聚合法合成一系列矽氧烷噻吩及噻吩矽氧烷之共聚物，如：Poly(siloxanylthiophene-co-3,4-ethylenedioxythiophene),Poly(siloxanylthiophene),
Poly(3,4-ethylenedioxythiophene)；再探討矽氧烷噻吩及其共聚物之熱性質、光學性質、氧化還原電位及其電致變色性質等。
本實驗室另將合成之矽氧烷噻吩Poly(siloxanyl thiophene)與高分子太陽能電池之重要材料Poly(3-hexylthiophene) (P3HT)共聚合成為矽氧烷噻吩衍生物 {poly(3-Siloxanylthiophene-co- 3-hexyl-thiophene)}，加熱至150度回溫後使用 UV-VIS光譜儀觀察其吸收強度，以了解材料之熱穩定性，使其增加材料之壽命。
第二部份 合成4-(N,N-Diethyldithiocarbamylmethyl)benzyltrimethyl ammonium Bromide 作為蒙脫土(Clay)之改質劑，使之改質成為親油性的有機黏土再以 Isoprene-RAFT自由基不終止聚合反應在clay上做高分子聚合，得到剝離clay含量18wt%的奈米複合材料，利用RAFT聚合可得到一極為狹小之分子量分布再添加至聚異戊二烯(polyisoprene)、聚丙烯(PP)後，同時做為Masterbatch的可行性。再加以量測其機械、熱性質，並量測在不同clay含量下之水氣阻隔性。

關鍵字

矽氧烷 ； 導電高分子 ； 循環伏安法 ； 蒙脫土 ； 可逆加成斷鍵鏈轉移反應

並列摘要

Poly(3,4-ethylenedioxythiophene)(PEDOT) and poly(3-hexylthiophene) (P3HT) have been demonstrated to be particularly useful in many applications, such as light-emitting diodes, organic field effect transistors, electroluminescent, solar cell and supercapacitors.
In the first part of this work ,we have successfully synthesized a series of polythiophene derivatives, containing siloxane groups attached to the C-3 position of thiophene units, such as Poly(siloxanyl-thiophene) ,Poly(siloxanylthiophene-co-3,4-
ethylenedioxythiophene),poly(3,4-ethylenedioxythiophene) and poly(3,4-Ethylenedio -xythiophene-co-3-hexyl-thiophene) .
Physical and chemical properities were measured and analyzed by H-NMR FT-IR、TGA、DSC、UV/vis、CV…etc.
In the second part of this study,we prepare a series of organic-inorganic nano
-composites consisting of polyisoprene、PP and organically modified Clay.
Living free radical polymerization of a variety of monomers using dithiocarbarmate photoiniferter modified clay gave dispersed polymer/clay nanocomposite, even for nanocomposites with very high clay contents (18wt%).
Here We report the preparation of isoprene/clay nanocomposites by RAFT in the presence of the dithiocarbonate transfer agent 4-(N,N-Diethyldithiocarbamylmethyl) -benzyltrimethylammonium as the radical initiator. Dispersion and random orientation of the clay layers in the polymer matrix were confirmed by wide-angle X-ray diffraction .The mechanical properties of the nanocomposites were investigated by Instron. Physical and chemical properities were also measured and analyzed by FT-IR、DSC、TEM、Gas permeability…etc.

並列關鍵字

conjugate polymer ； cyclic voltammetry ； reversible addition fragmentation chain transfer (RAFT) ； Montmorillonite

參考文獻

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