吡啶及其衍生物制备阴离子交换膜以及传质特性的研究
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摘要
离子交换膜是一种膜状的离子交换树脂。其用途非常广泛,其中比较重要的有海水淡化、苦咸水脱盐等。然而分离同电荷同价态的离子仍存在较大的困难。
     离子交换膜的种类不同,相应的制备方法也不尽相同。其中均相阴离子交换膜的制备比较困难,原因之一是氯甲基化时需要使用剧毒物质—氯甲醚,因此探索不使用氯甲醚而制备阴离子交换膜的路线非常必要。同时随着工业生产对离子交换膜要求的提高,对具有高热稳定性、化学稳定性、机械稳定性以及较低膜电阻的高选择性膜的需求也日益增多。
     用吡啶或其衍生物(4—乙烯基吡啶)对甲基溴化的聚2,6—二甲基—1,4苯撑氧(BPPO)基膜进行胺化,可以得到系列阴离子交换膜。所制备的阴膜对各种具有不同水合自由能的一价阴离子有着较好的分离效果。
     本论文共包括六章。第一章是绪论,对离子交换膜作简要介绍,包括离子交换膜的分类和制备以及应用与发展。最后提出本论文的设计思想和论文的主要工作。
     第二章介绍了吡啶对BPPO基膜进行改性制备阴离子交换膜以及制备方法的优化。选择吡啶作为胺化试剂是由于吡啶的亲水亲油平衡值较三甲胺的小,所制备的阴膜也比由三甲胺制备的阴膜具有较强的憎水性。还讨论了所得阴离子交换膜的基本性质。
     第三章介绍了4—乙烯基吡啶对BPPO基膜进行改性制备阴离子膜。选择4—乙烯基吡啶作为胺化试剂可以在引入吡啶基团的同时避免吡啶对BPPO基膜的腐蚀。该方法制备的阴膜具有较强的憎水性。讨论了所制备阴膜的基本性质,还比较了吡啶及4—乙烯基吡啶改性所制备膜的热稳定性和化学稳定性。
     第四章通过实验进一步探讨了吡啶及其衍生物(4—乙烯基吡啶)所制备阴离子交换膜对单价阴离子的选择渗透性。并讨论了阴膜憎水性、阴离子的水合半径及其水合能对离子在膜内选择渗透性的影响。
     第五章提出了一种通过测定电导率推测离子交换膜性质的简单方法。该方法基于离子交换膜的某些性能间的密切联系,以一组商业离子膜和一些本实验室制备的膜为例进行讨论。其正确性通过方程的线性,计算所得参数与所报道参数间的比较,以及所推测的结构参数的合理性进行验证。
     第六章是对全文的总结。通过前面的实验和理论分析,得出一些对离子交换膜制备有意义的结论。
Ion exchange membrane is a type of ion exchange resin in the shape of membrane.They are used in many fields,such as desalination of seawater and saline water;however,there is still a great challenge in exploring high-permselectivity membranes so as to separate ions of a sigh and/or charge.
     The preparing methods of ion exchange membranes vary with the species of membranes.Among these methods,the preparation of homogeneous anion exchange membranes is one of the most difficult since chloromethyl ether,a extremely toxic chemical,is often employed for chloromethylization.So it is necessary to find a route of preparing anion exchange membrane without using chloromethyl ether.Meanwhile,there are growing demands for the ion exchange membranes with high thermal,chemical,and mechanical stability,low membrane resistance,and high permselectivity.
     When pyridine or its derivative(4-vinylpyridine)is used to aminate bromomethylated poly(2,6-dimethyl-1,4-phenylene oxide)(BPPO),a series of anion exchange membranes can be obtained.The prepared anion exchange membranes can effectively separate some monovalent anions with different hydration free energy.
     The dissertation comprises six chapters.ChapterⅠgives an overview on the research background-ion exchange membrane:classification,preparation, application,and development.Then the research ideas and outlines are purposed.
     In chapterⅡ,a series of anion exchange membranes are successfully obtained by amination of pyridine on BPPO base membranes.Since pyridine is lower in hydrophilic-lipophilic balance(HLB)value than trimethylamine(TMA), the membranes prepared from pyridine will be higher in hydrophobicity than those prepared from TMA.The properties of the prepared anion exchange membranes are systematically investigated.
     In chapterⅢ,a series of anion exchange membranes are successfully obtained by amination of 4-vinylpyridine on BPPO base membranes.The use of 4-vinylpyridine can introduce pyridinium groups into the base membrane and avoid the degradation of pyridine in the base membrane.The hydrophobicity of the obtained membrane is relatively high.The properties of the prepared anion exchange membranes are systematically studied.The thermal and chemical stability of the membranes prepared from pyridine and 4-vinylpyridine respectively are compared.
     In chapterⅣ,the permselectivities of monovalent anions in the membranes prepared from pyridine or 4-vinylpyridine are further studied by experiments. And the factors impacting on membrane permselectivity to anions are fully discussed:the hydrophobicity of anion exchange membranes,and the Stokes radii and hydration free energies of the anions.
     A simple evaluation of microstructure and transport parameters through membrane conductivity is presented in chapterⅤ.The method is based on the relation between these properties.The method is exemplified through a series of commercial membranes and some lab-made membranes.It is also validated on the basis of the linearity of equations,the comparison between calculated and reported parameters,and the reasonability of the predicted structural parameters.
     ChapterⅥis a summary of the dissertation.Some important conclusions for preparation of the anion exchange membranes are underlined.
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