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首页> 外文学位 >High performance disulfonated poly(arylene sulfone) co- and terpolymers for proton exchange membranes for fuel cell and transducer applications: Synthesis, characterization and fabrication of ion conducting membranes.
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High performance disulfonated poly(arylene sulfone) co- and terpolymers for proton exchange membranes for fuel cell and transducer applications: Synthesis, characterization and fabrication of ion conducting membranes.

机译：用于燃料电池和换能器应用的质子交换膜的高性能二磺化聚（亚芳基砜）共聚物和三元共聚物：离子传导膜的合成，表征和制造。

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摘要

The results described in this dissertation have demonstrated several alternative proton exchange membranes (PEM) for hydrogen-air and direct methanol fuel cells (DMFC) that perform as well or better than the state of the art Nafion perfluorosulfonic acid membrane. Direct aromatic nucleophilic substitution polycondensations of disodium 3,3'-disulfonate-4,4 '-difluorodiphenylsulfone (SDFDPS), 4,4'-difluorodiphenylsulfone (DFDPS) (or their chlorinated analogs, SDCDPS, DCDPS) and 4,4' -thiobisbenzenethiol (TBBT) in the presence of potassium carbonate were investigated. Electrophilic aromatic substitution was employed to synthesize the SDFDPS or SDCDPS comonomers in high yields and purity. High molecular weight disulfonated poly(arylene thioether sulfone) (PATS) copolymers were easily obtained using the SDFDPS monomers, but in general, slower rates and a lower molecular weight copolymer was obtained using the analogous chlorinated monomers. Tough and ductile membranes were solution cast from N,N-dimethylacetamide for both series of copolymers. The degrees of disulfonation (20--50%, PATS 20--50) were controlled by varying the ratio of disulfonated to unsulfonated comonomers. Composite membranes were prepared by homogeneous solution blending the copolymers with phosphotungstic acid (PTA) in dimethylacetamide (DMAc). The composite PATS membranes exhibited moderate PTA molecule water extraction after acidification treatments performed at either room or boiling temperatures. The membranes containing HPA showed improved conductivity at high temperatures (120°C) and low relative humidities when compared to the pure copolymers.;Molecular weight of the copolymers plays a critical role in the overall copolymer physical behavior. It is well known that molecular weight has an enormous impact on practically all of the physical properties of polymeric systems. This dissertation discusses the influence of molecular weight on the characteristics of a specific family of PEM PATS copolymers. This study elucidated that the lower molecular weight materials did indeed behave differently than the higher molecular weight copolymers. Specifically, the water uptake and permeability to methanol decreased with increasing molecular weight. Furthermore, the fully hydrated mechanical properties also improved with molecular weight. (Abstract shortened by UMI.)
机译：这篇论文描述的结果已经证明了几种替代性的质子交换膜（PEM），用于氢-空气和直接甲醇燃料电池（DMFC），其性能比现有的Nafion全氟磺酸膜好或更好。 3,3'-二磺酸钠4,4'-二氟二苯砜（SDFDPS），4,4'-二氟二苯砜（DFDPS）（或其氯化类似物，SDCDPS，DCDPS）和4,4'-硫代双苯硫醇的直接芳族亲核取代缩聚研究了在碳酸钾存在下的三丁基锡（TBBT）。亲电子取代被用来以高产率和高纯度合成SDFDPS或SDCDPS共聚单体。使用SDFDPS单体可轻松获得高分子量的二磺化聚（亚芳基硫醚砜）（PATS）共聚物，但通常，使用类似的氯化单体可得到速率较慢且分子量较低的共聚物。对于两个系列的共聚物，由N，N-二甲基乙酰胺溶液流延形成坚韧且易延展的膜。通过改变二磺化与未磺化共聚单体的比例来控制二磺化度（20--50％，PATS 20--50）。通过将共聚物与磷钨酸（PTA）在二甲基乙酰胺（DMAc）中的溶液均匀混合来制备复合膜。在室温或沸腾温度下进行酸化处理后，复合PATS膜均表现出适度的PTA分子水萃取。与纯共聚物相比，含HPA的膜在高温（120°C）和较低的相对湿度下显示出改善的电导率。共聚物的分子量在整个共聚物的物理行为中起着至关重要的作用。众所周知，分子量实际上对聚合物体系的所有物理性能都有很大的影响。本文讨论了分子量对PEM PATS共聚物特定家族特性的影响。这项研究表明，低分子量材料的确确实与高分子量共聚物的性能有所不同。具体而言，吸水率和对甲醇的渗透性随分子量增加而降低。此外，完全水合的机械性能也随分子量而提高。 （摘要由UMI缩短。）

著录项

  • 作者

    Wiles, Kenton Broyhill.;

  • 作者单位

    Virginia Polytechnic Institute and State University.;

  • 授予单位 Virginia Polytechnic Institute and State University.;
  • 学科 Chemistry Organic.;Energy.;Chemistry Polymer.;Chemistry Physical.
  • 学位 Ph.D.
  • 年度 2005
  • 页码 360 p.
  • 总页数 360
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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