共查询到16条相似文献,搜索用时 203 毫秒
1.
将十二烷基苯磺酸掺杂的聚苯胺(PAn DBSA)与乙烯丙烯酸共聚物(EAA)或聚烯烃弹性体(POE)进行溶液共混制得了PAn DBSA/EAA或PAn DBSA/POE导电复合物。研究了绝缘聚合物的化学结构对聚苯胺导电复合物形态结构及电性能影响。结果表明,极性聚合物EAA中的羧基能与PAn形成氢键并发生掺杂作用,复合物中卷曲的PAn主链能充分展开,导致PAn/EAA复合物具有非常低的逾渗域值(1.5%),PAn含量为20.0%时,电导率高达7.1S/cm。POE为非极性共聚物,与极性较强的PAn相容性较差,导致PAn/POE复合物具有较高逾渗域值(5.0%),PAn含量为20.0%时,电导率仅为3.0×10-5S/cm。 相似文献
2.
磁场及反应条件对十二烷基苯磺酸掺杂聚苯胺聚合成膜速率的影响 总被引:3,自引:0,他引:3
在恒定磁场(0.6 T)条件下, 采用过硫酸铵(APS)为引发剂, 在乳液体系中合成了十二烷基苯磺酸(DBSA)掺杂的聚苯胺(PAn). 借助石英晶体微天平(QCM)实时监测苯胺(An)在金电极表面聚合成膜过程, 探讨了磁场、APS浓度、DBSA浓度及反应温度对DBSA掺杂聚苯胺聚合成膜速率的影响. 实验结果表明, PAn在金电极表面的成膜速率随磁场强度的增加而增大; 由反应物浓度与PAn成膜速率的关系, 得出相应的动力学反应级数; 由PAn膜的增长速率与温度的关系, 得到成膜过程的活化能为41.08 kJ/mol. 考察了PAn聚合过程的UV-Vis光谱, 并与QCM所得的结果进行了比较. 结果显示, 在相同时间内, 磁场环境下合成的PAn的吸收强度大于无磁环境下合成的PAn. 相似文献
3.
沉淀聚合制备磺酸掺杂的聚苯胺 总被引:14,自引:0,他引:14
以二丁基萘磺酸(DBNSA)或十二烷基苯磺酸(DBSA)为有机酸,水为主要反应介质的条件下进行沉淀聚合直接制备有机酸掺杂的聚苯胺(PAn).讨论了酸度、温度和氧化剂用量等反应条件对产物的影响。2L规模扩大实验的产率约为75%~80%,所得PAn具有高电导率(3.0S·cm-1),并易溶于普通有机溶剂。其中PAn-DBNSA在各方面较具优势。 相似文献
4.
5.
6.
以苯胺为单体,L-天冬氨酸(L-Asp)为模板分子,采用化学氧化法合成了掺杂L-Asp的导电聚苯胺(PAn).将PAn作为固定相填充到多孔陶瓷管中制备导电PAn电极柱,并以此电极柱作为工作电极.循环伏安图表明PAn电极柱具有良好的电化学活性.在电极柱上施加-0.6 V的还原电位,PAn中掺杂的L-Asp发生脱掺杂,从而在PAn膜上留下了与L-Asp完全匹配的空穴.由于PAn具有掺杂/脱掺杂完全可逆的独特性能,因此对带有分子印迹的PAn电极柱施加0.5 V的正电位后,由于存在强烈的分子印迹作用,L-Asp在电极柱上被富集,而D-天冬氨酸(D-Asp)的富集效果远低于L-Asp,从而实现对Asp对映体的识别. 相似文献
7.
在有、无外加恒定磁场(0.4T)条件下,采用乳液聚合法合成了十二烷基苯磺酸掺杂聚苯胺(PAn),通过傅立叶红外光谱(FT-IR)、在有/无外电场作用下产物/m-cresol溶液的电导率、pH及其颜色随温度变化的分析表征,系统研究了温度对PAn/m-cresol溶液中PAn氧化-还原(掺杂-脱掺杂)行为的影响.溶液电导率和pH的测试结果显示,溶液电导率与溶液中游离掺杂酸的浓度成正比,PAn的掺杂度随温度的升高而降低,随温度的降低而增大,且在相同温度下,有、无外电场作用时PAn/m-cresol溶液的电导率存在突跃.与无磁场条件下合成的PAn所制备的m-cresol溶液相比,磁场条件下合成的PAn所制备的m-cresol溶液电导率的突跃更加显著.经脱掺杂处理后的PAn/m-cresol溶液的电导率均较低,对温度变化的响应极其微弱,且在有、无外电场作用时不发生突跃.分析认为,这是由于外电场作用下m-cresol溶液中掺杂态的PAn分子发生了取向重排,而脱掺杂的PAn则无此变化.PAn在外电场作用下的取向重排及氧化-还原性均与其掺杂程度相关,掺杂程度越高,氧化-还原及取向重排越显著. 相似文献
8.
乙醇对双核酞菁钴掺杂聚苯胺膜修饰电极特性的影响 总被引:2,自引:1,他引:1
研究了乙醇对双核酞菁钴(b i-CoPc)掺杂聚苯胺(PAn)膜修饰电极特性的影响。用循环伏安法(CV)考察了乙醇浓度不同时,玻碳电极(GC)上双核酞菁钴掺杂聚苯胺的电聚合过程,用紫外-可见吸收光谱(UV-V is)、红外光谱(FTIR)和扫描电子显微镜(SEM)表征了在氧化铟锡玻璃(ITO)电极上b i-CoPc掺杂的PAn膜,研究了乙醇对膜以及该膜修饰电极对溶液中分子氧电催化性能的影响。结果表明,乙醇对苯胺的电聚合有促进作用,有助于增加b i-CoPc掺杂量,膜的光谱特性发生变化,表面形貌更加均匀。乙醇存在下制备的修饰电极对溶液中分子氧的电催化活性明显提高。当乙醇含量为10%时,制备的电极催化能力最强。 相似文献
9.
聚吡咯的合成与新型双离子电池性能研究 总被引:10,自引:0,他引:10
用反相微乳聚合法制备了十二苯磺酸(DBSA)掺杂的导电聚吡咯纳米材料, DBSA既作为表面活性剂又作为掺杂剂, 能够提高聚吡咯的导电性. 用制备出的DBSA-PPy 为正极材料, 石墨为负极材料组装双离子电池, 测试结果表明, C/DBSA-PPy 电池的电化学性能已达到传统锂离子电池的水平, 这是因其具有较高的导电性和特殊掺杂结构的聚吡咯使其电化学性能得到优化. 相似文献
10.
11.
Zhou Zhou Deliang He Xueling Li Shiqing Wang Guoxi Li 《Polymer Science Series B》2008,50(7-8):209-214
Three nanosized polyaniline (PAn) powders doped with ionic liquid and dodecyl benzene sulfonic acid (DBSA) or hydrochloric acid have been prepared for the first time in an ionic liquid-water emulsion system. The oil-phase ionic liquid is used as both a monomer solvent and doped counterion. The effects of different counterions on the properties (molecular weight, electrical conductivity, glass transition temperature, electrochemical activity) of PAn are investigated. PAn codoped with 1-butyl-3-methylimidazolium hexafluorophosphate ionic liquid and DBSA shows the highest molecular weight (81 104 g mol?1), the highest electrical conductivity (1.85 S cm?1), the lowest glass transition temperature (181°C) and the highest redox reaction current density; PAn doped with an ionic liquid only exhibits the lowest conductivity (0.0018 S cm?1) and a lower redox reaction current density. PAn codoped with ionic liquid and HCl shows higher conductivity. They also exhibit good electrochemical stability and charge-discharge performance. These indicate that codoping of different counterions under acidic conditions could improve the degree of oxidation and doping ratio of PAn and could result in high electrical conductivity and good electrochemical properties. 相似文献
12.
导电聚苯胺与Fe3O4磁性纳米颗粒复合物的合成与表征 总被引:28,自引:0,他引:28
对十二烷基苯磺酸(DBSA)掺杂的导电聚苯胺(PAn-DBSA)的氯仿溶液,在pH为中性的条件下,采用“修饰-再掺杂(Modification-re-doped)法”合成了含有Fe3O4磁性纳米颗粒的导电聚苯胺复合物的有机溶液.用FTIR,XRD,TEM,UV-Vis和SQUID等对所得复合物进行了表征,结果表明,该复合物呈现超顺磁性和半导体的导电性,并具有较好的透明性. 相似文献
13.
The paper describes steady and dynamic rheological characterization of a system in which polyaniline (PAn) is dispersed in aqueous medium by the effect of a surfactant sodium dodecyl sulphate (SDS). During polymerization of aniline in SDS medium, large and agglomerated micelle–polymer structures are formed (supported by TEM and DLS) resulting in high viscosity of the medium. On application of steady shear micellar entanglements are ruptured and the system exhibits yield properties followed by shear thinning. From the frequency dependence of storage and loss modulii (G′ and G″) it seems that the system behaves more like a viscous fluid rather than an elastic liquid. Carrying out the same experiments on another dispersion in which PAn is stabilized by dodecyl benzenesulphonic acid (DBSA), very different viscoelastic response was received. DBSA molecules become counter-ions to PAn chains and this way large and interconnected PAn–DBSA structures are formed by mutual sharing of DBSA anions and PAn chains. This system therefore, exhibits gel like properties and encounters a gel to sol transition at larger deformation. Detailed studies have established that PAn–SDS is a stabilized dispersion that resembles entangled polymeric solutions to some extent while PAn–DBSA is a partially flocculated system. Therefore, rheological response of the system is mainly governed by the mutual orientation of PAn with respect to the micelles rather than the individual properties of the components. None of these systems, however, follow the established Maxwell’s model and a single relaxation time is not obtained. Rather, Rouse model of multiple relaxation times is partially applicable to PAn–SDS dispersion. 相似文献
14.
乳液法制备掺杂聚苯胺的微观结构研究 总被引:8,自引:0,他引:8
在众多的导电聚合物中,聚苯胺(PAn)被认为是最具应用前景的导电聚合物[1].本征态PAn的电导率约10-13S/cm数量级,呈电绝缘性.当用质子酸对PAn掺杂后,电导率达到5~10S/cm,可实现从绝缘体到导体的转变. 相似文献
15.
采用石英晶体微天平(QCM)技术,探讨了以三氯化铁(FeCl3)和过硫酸铵(APS)为复合氧化剂,十二烷基苯磺酸(DBSA)为乳化剂和掺杂剂时,苯胺(An)的乳液聚合动力学行为;并通过对产物的循环伏安分析,初步优化了聚合反应条件.结果表明,An的乳液聚合反应对复合氧化剂、An以及DBSA分别为1,0.5和0.5级.各种条件下的循环伏安(CV)图都显示出PAn的三对氧化还原特征峰.当FeCl3与APS物质的量比为2∶1;氧化剂总量与苯胺的物质的量比为3∶1;DBSA浓度为0.05mol/L时,CV测试的峰电流和电导率最大. 相似文献