聚3，4-乙烯二氧噻吩/聚胺酯複合薄膜之合成及其酸鹼緩衝與抗靜電性質研究

Synthesis and Characterization of PEDOT/PU composite film with pH-tuning and anti-electrostatic Properties

黃雅君(Ya-Chun Huang)

指導教授 ： 邱文英

國立臺灣大學/工學院/高分子科學與工程學研究所/碩士(2010年)

https://doi.org/10.6342/NTU.2010.10141

摘要

此實驗主要可分為兩個部份，第一部份是利用乳化聚合法合成PEDOT奈米乳膠顆粒，第二部份是將第一部份得到的PEDOT奈米乳膠顆粒，與PU薄膜作結合，以得到具pH緩衝功能之PEDOT/PU奈米抗靜電複合薄膜。
在第一部份我們利用乳化聚合法，使用Fe(OTs)3以及雙氧水當作雙氧化劑系統，氧化EDOT (3,4-ethylenedioxythiophene)單體，合成出導電高分子PEDOT奈米乳膠顆粒。合成好之PEDOT乳膠顆粒利用TEM及動態光散射法( DLS )觀察其型態與粒徑分佈，發現PEDOT乳膠顆粒粒徑約為60-150nm，並以UV-Visible光譜觀察PEDOT乳液透析純化前後摻雜( doping )程度的影響。第二部份則是將PEDOT乳膠顆粒與PU作結合。在PEDOT/PU方面，分別以未純化之PEDOT以及經過透析純化之PEDOT與PU作結合，製備成PEDOT/PU複合薄膜。接著我們將PEDOT/PU複合薄膜以熱重損失分析儀( TGA )、微差掃描卡計( DSC )與萬能拉力機探討分析其機械性質、熱性質、相容性與結構間作用力等問題。
在導電度方面，以未純化之PEDOT進行與PU的混摻，我們發現此複合薄膜，其導電度隨著PEDOT的含量上升而上升。結果顯示，在添加2wt% PEDOT時，導電度由純PU的10-8S/cm提高到 10-6 S/cm，成功達到抗靜電範圍。另一方面，我們以掃描式電子顯微鏡( Scanning Electron Microscopy, SEM )觀察PEDOT/PU複合薄膜表面型態，從SEM圖發現，未純化之PEDOT/PU複合薄膜，PEDOT分散地較為均勻，彼此相容性佳。而藉由PU本身的材料特性，可以有效改善PEDOT本身硬脆，不易加工的缺點。
在酸鹼緩衝部分， PEDOT/PU複合薄膜可讓pH=5-9之水溶液調控到pH=7附近。因此本實驗成功地製備了同時具有酸鹼緩衝與抗靜電特性之多功能PEDOT複合薄膜。

關鍵字

聚3，4-乙烯二氧噻吩 ； 聚氨酯 ； 乳化聚合法 ； pH緩衝

並列摘要

This study was divided into two main parts. First, by using emulsion polymerization, PEDOT latex nanoparticles were synthesized. Second, the PEDOT latex obtained in first part was combined with Polyurethane ( PU ) to prepare the PEDOT/PU composite films with pH-tuning and anti-electrostatic properties.
In the first part, PEDOT latex nanoparticles were synthesized by emulsion polymerization, which both Fe(OTs)3 and H2O2 were used as mixed initiators during the polymerization. The morphology of PEDOT latex nanoparticles was observed by TEM and DLS. Results showed that the sizes of PEDOT nanoparticles were from 60 to 150 nm. The doping level of PEDOT latex was also observed via UV-visible spectrometer. In the second part, PEDOT latex nanoparticles were mixed with PU to prepare the PEDOT/PU composite films. We used unpurified PEDOT or purified PEDOT to fabricate PEDOT/PU composite films. The properties of PEDOT/PU composite films were measured by thermogravimetric analysis ( TGA ), differential scanning calorimetry ( DSC ) and tensilon to discuss the mechanical and thermal properties. The interaction and compatibility of the PEDOT/PU blends were also studied.
The conductivity of the unpurified PEDOT/PU composite films increased with the weight ratio of the PEDOT. When the weight of PEDOT reached to 2 wt%, the conductivity of PEDOT/PU composite film raised from 10-8 S/cm to 10-6 S/cm which located in the range of anti-electrostaticity. From the results of scanning electron microscopy ( SEM ), the unpurified PEDOT nanoparticles in PU films showed better dispersity and compatibility than the purified one.
The pH-tuning capacity of PEDOT latex and PEDOT/PU composite films were both tested in aqueous solution with different pH value.
The pH regulation capacities of PEDOT latex nanoparticles and PEDOT/PU composite films showed good ability in the region of pH=5-9 and weak basic region, respectively.

並列關鍵字

PEDOT ； PU ； Emulsion polymerization ； pH-tuning

參考文獻

[1] E. J. L. H. Shirakawa, A. G. MacDiarmid, C. K. Chiang, and A. J. Heeger, Journal of the Chemical Society-Chemical Communications, p. 578, 1977.

[2] D. C. Trivedi, Handbook of Organic Conductive Molecules and Polymers, vol. 2, p. 548, 1997.

[3] M. Aldissi, Inherently Conducting Polymers, 1989.

[6] M. G. Kanatzidis, Chemical and Engineering News, vol. 36, p. 68, 1990.

[9] S. K. U.Tracht, 5th International Symposium on Functional pi-Electron Systems, 2002.