Microdomain Control by Means of Epitaxial Growth and Its Application for Functional Materials

本项目的目的是通过在支撑膜表面外延生长微异相结构域图案来研究嵌段和接枝共聚物或聚合物共混物的微区控制。有可能将这些复合膜转化为电荷镶嵌膜或生物医学装置。主要研究结果如下：1.以可降解链转移剂为引发剂，通过官能化偶氮引发剂进行封端反应，合成了聚苯乙烯(PS)/或聚乙酸乙烯酯大单体。这种大单体是制备定义明确的接枝共聚物的最佳单体之一。我尝试通过外延生长的方法来控制PS/聚(4-乙烯基吡啶)(P4VP)共混物的磁区结构。透射电子显微镜和扫描电子显微镜观察发现，支撑膜表面的微相结构由一种定义良好的聚S-b-4VP组成，并向上层的微区传递。类似的结果也得到了…研究了以聚(HEMA-g-S)、聚乙烯醇(PVA)/P4VP、PS/P4VP、聚丙烯酸(PAA)/P4VP为原料的PS/PHEMA共混膜体系。这些具有垂直取向微域的薄膜在上层的一个组分域固定后进行湿法刻蚀，得到固定组分在支撑膜上的垂直取向微域图案。微区结构(片状和圆柱状)通过以交联PS为支撑膜的表面外延生长，使其界面平行于支撑膜表面。将PAA/P4VP共混物-聚(VA-g-4VP)体系构建在多孔PVA或聚氯乙烯膜滤膜上，制备了电荷镶嵌复合膜。在正负电荷区的结构域固定和P4VP结构域的季节化处理后，用这些电荷镶嵌复合膜对KCl2和蔗糖进行了透析分离。较少

The aim of this project is to study the microdomain control of block and graft copolymers or polymer blends by means of an epitaxial growth of the microheterophase domain pattern on the support membrane surface. It is possible to convert these composite membranes into charge mosaic membrane or biomedical devices. The obtained results are as follows:1. Polystyrene(PS) /or polyvinyl acetate macromonomers were synthesized by a functional azo-initiator in the presence of degradative chain transfer agent, followed by an end-capping reaction. This macromonomer is one of the best for the preparation of well-defined graft copolymers.2. I have attempted to control the domain structure of PS/poly(4-vinylpyridine)(P4VP) blend by means of epitaxial growth. It was found from TEM and SEM observations that the microheterophase structure of the support membrane surface composed of a well-defined poly(S-b-4VP) was transmittd to the microdomains of the upper layer. Similar results have been also obtaine … More d for the composite membrane systems of PS/PHEMA blend using poly(HEMA-g-S), poly(vinyl alcohol)(PVA)/P4VP, PS/P4VP, and poly(acrylic acid)(PAA)/P4VP using poly(VA-g-4VP).3. These membranes having vertically-oriented microdomains were being wet-etched after domain fixing of one component of the upper layer, the vertically-oriented microdomain patterns of the fixed component were obtained on the support membrane.4. The microdomain structures (lamellae and cylinders) were oriented their interfaces parallel to the support membrane surface by means of an epitaxial growth from the surface of crosslinked PS as a support membrane.5. The Charge mosaic composite membranes were prepared by constructing PAA/P4VP blend - poly(VA-g-4VP) systems on the porous PVA or poly(vinyl chloride) membrane filters. After the treatment of domain fixing of positive/negative charge regions and quaternization of P4VP domains, the dialytic separation of KCl from saccharose was tested with these charge mosaic composite membranes. Less