【作者】 李玉峰；

【导师】 王云普；

【作者基本信息】 西北师范大学 ， 高分子化学与物理， 2005， 博士

【摘要】 聚苯胺(PANI)除具有抗氧化性和热稳定性之外,还兼有独特的掺杂行为和良好的电化学可逆性,具有电导率高、掺杂态和未掺杂的环境稳定性好、易于合成、单体的成本低等优点,被认为是最有实际应用前景的导电聚合物之一。聚苯胺通过与其它物质的复合,不但克服了其加工性能差的缺点,还可以获得具有多种功能性的复合材料,广泛应用于导电材料、电池、电显示、静电屏蔽、微波吸收、金属防腐等领域。特别是聚苯胺复合防腐涂料,对金属具有常规涂料不可比拟的阳极保护和屏蔽作用,以及抗划伤能力等独特的防腐蚀性能,有可能成为聚苯胺最有希望的应用领域之一。 本文首先制备了聚苯胺/蒙脱土复合材料,并首次以水性环氧树脂乳液、水性氟碳乳液、水性叔氟乳液为成膜物质,制备系列聚苯胺/蒙脱土水分散体复合防腐蚀涂层材料,考察了复合涂层对A3钢及不锈钢的防腐蚀性能。全文包括五部分。 第一章 聚苯胺复合材料研究进展 综述了导电高分子、聚苯胺、聚苯胺复合材料和聚苯胺复合防腐涂料的研究进展,特别对聚苯胺复合防腐涂料的种类、制备、特性、防腐机理及应用等进行了较为详细地阐述。引用参考文献185篇。 第二章 聚苯胺/蒙脱土复合材料的制备及性能研究 以盐酸(HCl)、对甲基苯磺酸(PTSA)、樟脑磺酸(CSA)、十二烷基苯磺酸(DBSA)、聚苯乙烯磺酸(PSSA)等为掺杂剂,制备了系列聚苯胺/蒙脱土复合材料。并对首次合成的聚苯乙烯磺酸掺杂水溶性聚苯胺/蒙脱土复合材料(PSSA-PANI/MMT)进行了较全面的结构和性能表征。复合材料为蒙脱土以剥离为主的混合纳米形态,热稳定性很好,具有比PSSA-PANI更为稳定的变温电导率。 第三章 聚苯胺/蒙脱土╱水性环氧树脂乳液复合防腐蚀涂层的制备及性能研究 以水性环氧树脂乳液为成膜物质,与制备的水溶性聚苯胺/蒙脱土复合材料共混,再加入水性环氧树脂固化剂乳液,制得水分散体聚苯胺/蒙脱土/水性环氧树脂复合涂层材料。电化学交流阻抗谱(EIS)和Tafel曲线测试结果表明环氧树脂中添加更多还原

【Abstract】 Among conducting polymers, polyaniline (PANI) is a promising material for commercial applications, because of its environmental stability, good processability, and relatively low cost. It can be applied to electronic devices and products such as light-emitting diodes, organic FETs, EMI shielding, secondary batteries, etc. Blends or composites of PANI with other polymers or inorganic materials can provide new synergistic properties that cannot be attained from individual materials. The use of PANI blends(composites) as anticorrosion coatings had been explored as the potential candidates to replace the chromium-containing materials, which have adverse health and environmental concerns. Moreover, the corrosion resistance of PANI coatings seems to extend to scratched areas where bare steel surface is exposed to aggressive environment.1. The progress of conducting polymers, polyaniline, blends or composites of polyaniline and PANI blends(composites) as anticorrosion coatings were reviewed in this part. 185 references were quoted.2. Polystyrene sulfonic acid (PSSA) doped water-soluble polyaniline (PANI)/ montmorillonite (MMT) clay composites were firstly synthesized by intercalation polymerisation in aqueous medium. The results show the composites has a mixed nanomorphology and exfoliated silicate nanolayeis of MMT clay dispersed in the polyaniline matrix. This composites is more thermal stable than that of without clay samples and results in good stable temperature-dependent dc conductivity[ σ dc(T)] as temperature changed.3. The composite anticorrosion coatings of PANI/MMT and waterborne epoxy resin emulsion(EP) were prepared by mixture in aqueous medium, and used for anticorrosion to A3 steel and stainless steel. Electrochemical impedance spectroscopy(EIS) and Tafel plot demonstrated that the PANI/MMT/EP compositecoatings has better anticorrosion properties than PANI/EP, MMT/EP and PAWMMT/EP mixture. It’s impedance and corrosion potential is higher and the corrosion current density is lower.4. We firstly prepared composite anticorrosion coatings of PANI/MMT and waterborne fluorocarben emulsion(FC). The results of electrochemical impedance spectroscopy(EIS) and Tafel plot shows PANI/MMT/FC composite coatings has good anticorrosion properties to A3 steel and stainless steel.5. PANtyMMT and vinyl ester of versatic acid(VedVa)-flu?wocarben copolymeric emulsion(PANI/MMT/VF) composite coatings were prepared for the first time to improve the anticorrosion properties of PANI/MMT/FC composite coatings. The results of electrochemical impedance spectroscopy(EIS) and Tafel plot shows PANI/MMT/VF composite coatings has the best anticorrosion properties to A3 steel and stainless steel in this series because of the special structure of VeoVa.更多还原