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Synthesis and Surface Formation of Three-Component Graft Copolymers

三元接枝共聚物的合成与表面形成

基本信息

批准号：
08455436
负责人：
TEZUKA Yasuyuki
金额：
$ 0.77万
依托单位：
Tokyo Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1997
项目状态：
已结题

项目摘要

The present study has aimed to obtain new insights for the environmental response behavior, unique to flexible polymer materials surfaces. The precise design with respects to the segment topology of multicomponent polymer molecule is a prerequisite for unprecedented functions required in advanced application fields from bioengineering to tribology.We have first examined on the surface formation and environmental response behavior on three-component copolymer systems. Thus we have synthesized PVA (polyvinyl alcohol) and PU (polyurethane) -based three-component systems, i.e.PVA or PU as the main chain segment and PS (polystirene) -block-PDMS (polydimethylsiloxane) as a graft segment, in which the geometrical arrangement of the three segments is inverse to the order of their surface energies, i.e.PVA (orPU) >PS>PDMS.The surface formed under the influence of the two conflicting driving forces exhibited unique environmental response by the change of the contacting medium from air to water.We have also designed a new polymer reaction process by making use of self-assembly principle in order to pre-organize macromolecular components, and subsequently converting them into permanent polymer arcitectures. Thus a unique feature, i.e.electrostatic self-assembly and subsequent covalent fixation capability, of the pyrrolidinium salt end groups has been applied for the preparation of topologically-unique, branched polymers, ring polymers and network polymers. The simple coprecipitation of the monofunctional telechelics having a cyclic onium salt group with plurifunctional carboxylates of appropriate nucleophilic reactivities has been carried out to produce the corresponding star- and comb-shaped polymers, and that of bifunctional telechelics with bifunctional carboxylate leading to the ring polymers in a diluted solution as well as the chain-extended "segmented" polymers and "model-network" polymers in a condensed phase, respectively.

本研究的目的是获得新的见解的环境响应行为，独特的柔性聚合物材料表面。多组分聚合物分子链段拓扑结构的精确设计是实现从生物工程到摩擦学等先进应用领域所需要的前所未有的功能的前提。因此我们合成了PVA（聚乙烯醇）和PU（聚氨酯）基三组分体系，即PVA或PU作为主链段，PS聚苯乙烯嵌段-PDMS（聚二甲基硅氧烷）作为接枝链段，其中三个链段的几何排列与它们的表面能的顺序相反，即PVA（或PU）>PS>在两种相互冲突的驱动力作用下形成的表面，通过改变接触介质从空气到水，表现出独特的环境响应。我们还设计了一种新的聚合物反应过程，利用自组装原理，以便预组织大分子组分，随后将它们转化为永久性聚合物结构。因此，吡咯烷鎓盐端基的独特特征，即静电自组装和随后的共价固定能力，已被应用于制备拓扑独特的支化聚合物、环状聚合物和网络聚合物。已经进行了具有环状鎓盐基团的单官能遥爪与具有适当亲核反应性的多官能羧酸酯的简单共沉淀，以制备相应的星星形和梳形聚合物，双官能遥爪与双官能羧酸酯的反应导致在稀溶液中的环状聚合物以及扩链的“嵌段”聚合物和“模型网络”聚合物在凝聚相分别。