Preparation of capsule particles by self-assembling phase separated polymer method and its application

自组装相分离聚合物法制备胶囊颗粒及其应用

基本信息

批准号：
17201025
负责人：
OKUBO Masayoshi
金额：
$ 30.7万
依托单位：
Kobe University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2007
项目状态：
已结题

项目摘要

We have proposed the preparation method for micron-sized, cross-linked polystyrene/polydivinylbenzene (PS/PDVB) particles having a single hollow. The mechanism for the hollow polymer particles was based on the Self-assembling of Phase Separated Polymer at an interface with aqueous media, which was named the SaPSeP method. Recently, when the SaPSeP method was applied in the presence of sodium dodecyl sulfate (SDS), it was found that a single hole was formed in the shell of the hollow PS/PDVB composite particles.In this research, in order to clarify such a strange phenomenon, preparations of capsule particles were examined in detail. It was clarified that the phase separation in the droplets in the early stage of the polymerization was one of key factors for the formation of the single hole. Hole was most likely formed as a result of reduced microgel adsorption at oil-water interface domains of high SDS content. Moreover, we succeeded in preparing submicrometer-sized hollow PS particles, microcapsules containing curing agent for epoxy resin, and PDVB particles with encapsulated titanium oxide or n-hexadecane (HD)by micro-suspension polymerization utilizing the SaPSeP method. HD is useful for heat storage materials. The encapsulation of HD has many advantages that provide large heat transfer area and control the volume change of the heat storage materials. However, there were some problems in encapsulated HD such as decrease of the heat of solidification and supercooling. In this research, the problem in the application of the polymer particles with encapsulated HD as heat storage material was improved by the copolymerization of hydrophilic acrylic monomer. This seems to be based on that the copolymerizations of hydrophilic monomer enhance the phase separation of copolymer chains and HD, eventually resulting in the complete isolation of the HD core from the polymer shell.

我们提出了具有单空心的微米级交联聚苯乙烯/聚二乙烯基苯（PS/PDVB）颗粒的制备方法。空心聚合物颗粒的机理是基于相分离聚合物在与水介质界面处的自组装，被命名为SaPSeP方法。最近，当SaPSeP方法在十二烷基硫酸钠（SDS）存在下应用时，发现中空PS/PDVB复合粒子的壳中形成了单孔。在本研究中，为了澄清这样的现象奇怪的现象，对胶囊颗粒制剂进行了详细检查。阐明了聚合初期液滴内的相分离是单孔形成的关键因素之一。孔的形成很可能是由于高 SDS 含量的油水界面区域微凝胶吸附减少的结果。此外，我们利用SaPSeP方法通过微悬浮聚合成功制备了亚微米尺寸的空心PS颗粒、含有环氧树脂固化剂的微胶囊以及封装有氧化钛或正十六烷（HD）的PDVB颗粒。 HD 对于储热材料很有用。 HD封装具有许多优点，可以提供较大的传热面积并控制蓄热材料的体积变化。然而，封装HD存在一些问题，例如凝固热降低和过冷。本研究通过亲水性丙烯酸单体的共聚，改善了包覆HD的聚合物颗粒作为蓄热材料应用中的问题。这似乎是基于亲水单体的共聚增强了共聚物链和HD的相分离，最终导致HD核与聚合物壳完全隔离。