Preparation of hollow polymer particles encapsulating functional substance and its application

包覆功能物质的中空聚合物颗粒的制备及其应用

基本信息

批准号：
14205098
负责人：
OKUBO Masayoshi
金额：
$ 26.87万
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：
2002
资助国家：
日本
起止时间：
2002 至 2004
项目状态：
已结题

项目摘要

Polymer particles with hollow structures have gotten a lot of attention in many industrial fields. Such particles are used as microcapsules, weight-saving or thermal insulation agents, and are applied to hiding or opacifying agents in coating and molding compositions because of their high light-scattering ability. We had succeeded in preparing micron-sized, monodisperse, crosslinking polymer particles having a single hollow at the center by seeded polymerization. Similar hollow polymer particles were produced by suspension polymerization for divinylbenzene (DVB)/toluene droplets dissolving polystyrene though they were polydisperse. The formation of the hollow structure is based on the self- assembling of phase separated polymer at the interface of the droplet. The method is named the Self-assembling of Phase Separated Polymer (SaPSeP) method.In this research, in order to clarify the formation mechanism of hollow particles by the SaPSeP method in more detail, the effects of phase separation of PDVB in the droplets, viscosity within the droplet and its size on the formation of the hollow structure were discussed. The phase separation in the early stage was required point for the formation of the hollow structure. Since the viscosity in the droplet is low at the low conversion, the PDVB can move and adsorb at the interface of the droplet. The mobility of PDVB microgels after the phase separation in polymerizing droplet was important factor for the formation of the hollow structure. The SaPSeP method was developed to produce composite particles encapsulating hinokitiol or magnetite. Moreover, the method was applied to the polyaddition reaction in a suspension system. The polyaddition reaction system satisfied the required conditions for the preparation of hollow particle by the SaPSeP method. In actual, cured epoxy resin particles having one hollow at the center were successfully prepared after evaporation of toluene.

在许多工业领域，具有空心结构的聚合物颗粒引起了很多关注。此类颗粒被用作微胶囊，节省重量或热绝缘剂，并且由于其高光散射能力而被应用于涂层和成型组合物中的隐藏或不粘合剂。我们成功地制备了微米大小的单分散，交联的聚合物颗粒，通过种子聚合在中心有一个空心的聚合物颗粒。通过悬浮的聚合物化的二烷基苯（DVB）/甲苯液滴溶解聚苯乙烯，但它们是通过悬浮聚合物化的。空心结构的形成是基于液滴界面处的相分离聚合物的自组装。该方法被命名为相分离聚合物（SAPSEP）方法的自组装。在这项研究中，为了通过SAPSEP方法阐明空心颗粒的形成机理，更详细地，在讨论了液滴中PDVB相位分离的效果，液滴内的粘度以及液滴内的粘度以及其大小对Hollow结构的大小的效果。在早期阶段的相位分离是空心结构形成的点。由于液滴中的粘度在低转化率时很低，因此PDVB可以在液滴的界面移动并吸附。聚合液滴中相分离后PDVB微凝胶的迁移率是形成空心结构的重要因素。开发了Sapsep方法来产生包裹hinokitiol或磁铁矿的复合颗粒。此外，该方法被应用于悬浮系统中的多辐射反应。多辅助反应系统满足了通过SAPSEP方法制备空心粒子的所需条件。在实际的，固化的环氧树脂颗粒中，在甲苯蒸发后，在中心有一个空心的颗粒。