聚苯胺與聚苯乙烯殼核複合材料之研究; Chraracterization of polyaniline and polystyrene core-shell composite

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題名:	聚苯胺與聚苯乙烯殼核複合材料之研究;Chraracterization of polyaniline and polystyrene core-shell composite
作者:	嚴榆翔;Yu-Hsiang Yen
貢獻者:	化學工程與材料工程研究所
關鍵詞:	乳膠;殼核材料;複合材料;導電高分子;聚苯胺;聚苯乙烯;core-shell;latex;polystyrene;conductive polymer;polyaniline;composite
日期:	2002-06-21
上傳時間:	2009-09-21 12:20:27 (UTC+8)
出版者:	國立中央大學圖書館
摘要:	在本研究中，我們製備單分散聚苯胺/聚苯乙烯核殼乳膠。以苯乙烯為單體，2-2-azobis-isobutyronitrile，polyvinyl- pyrrolidone為起始劑及穩定劑以分散聚合的方法，合成單分散的非離子型聚苯乙烯與苯乙烯-苯乙烯磺酸鈉共聚物乳膠。並以聚苯乙烯為單體，potassium peroxodisulfate為起始劑，以無乳化劑乳化聚合的方法，合成單分散的陰離子型聚苯乙烯乳膠。以聚苯乙烯乳膠為核心，合成聚苯胺為外殼的殼核乳膠複合材料，並以SEM、TEM、IR、界面電位儀、元素分析、XPS及導電度測量鑑定所合成的材料。藉由苯乙烯-苯乙烯磺酸鈉共聚物（聚苯乙烯共聚物）乳膠的SO3基及陰離子型聚苯乙烯乳膠的負電荷可以親水又可以吸引苯胺單體，使苯胺單體吸附在苯乙烯表面上，再聚合可得均勻分佈的殼核結構，我們可以控制苯胺單體與聚苯乙烯的重量比，來控制聚苯胺包覆在聚苯乙烯表面上的量，進而改進導電度。本研究所合成的乳膠，粒徑分佈不均一，可能會造成所包覆的聚苯胺無法明確的比較其厚薄，但由其顏色、元素分析、XPS分析結果顯示，聚苯胺確實包覆上去。苯乙烯-苯乙烯磺酸鈉共聚物乳膠及陰離子型聚苯乙烯乳膠，因為表面帶負電值較高的情況下，對於苯胺的吸附，有較大的幫助，聚合後的聚苯胺在表面分佈較均勻，形成平滑的表面。在含相同含量的苯胺單體母液下聚合，導電度也比較高。使用分散聚合所得的非離子型聚苯乙烯乳膠與苯乙烯-苯乙烯磺酸鈉共聚物乳膠，其乳膠粒子的穩定性較高。所合成出的殼核乳膠結構中，聚苯胺/聚苯乙烯共聚物殼核乳膠由SEM與TEM相片觀察，其粒徑分佈較不均一，但懸浮液穩定，導電度較高。均一粒徑的改善，是未來研究的方向。 In this study, a feasible route for preparing polyaniline/polystyrene core shell latex was developed. The monodisperse nonionic polystyrene latex and poly(styrene co sodium styrene sulfonate) latex were synthesized by dispersion polymerization method, using styrene as monomer, polyvinylpyrrolidone as stabilizer, 2-2-azobis-isobutyronitrile as initiator. The monodisperse anionic polystyrene latex was also synthesized by emulsifier-free emulsion polymerization method, using styrene as monomer, potassium peroxodisulfate as initiator. Then aniline was polymerized on the surface of polystyrene latex. The core-shell composites were formed and studied by SEM, TEM, IR, Zeta potential, elemental analysis, XPS and conductivity measurements. Anilinium ions are adsorbed on the surface of polystyrene latex by columbic interaction between the sulfonate groups of poly(styrene co sodium styrene sulfonate) and negative charges on anionic polystyrene latex. After polymerization, more uniform polyaniline shell structures were obtained. We can control the amounts of polyaniline by adjusting the weight ratio of aniline monomer and polystyrene latex in mother liquids. The conductivity of the core-shell composites can be improved. Although the particle sizes of the core and core-shell composites are not very uniform, the thickness of polyaniline shell in the core-shell composites cannot be determined, but the color, elemental analyses, and XPS results show that polyaniline is formed on polystyrene latex. Polymerization of aniline in mother liquid containing the same quantity of aniline monomers on more negatively charged polystyrene latex results in more conductive composites. The suspensions of nonionic polystyrene latex and poly(styrene co sodium styrene sulfonate) latex are more stable than that of the anionic polystyrene latex. SEM and TEM photographs indicate the distribution of the particle sizes is wider for polystyrene copolymer latex, but the stability of the suspension and conductivity are higher for the composites. Improvement of the uniformity of the latex particles will be the objective of future study.
顯示於類別:	[化學工程與材料工程研究所] 博碩士論文

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