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Study on magneto-processing of polymers

聚合物磁加工研究

基本信息

批准号：
16550171
负责人：
YONETAKE Koichiro
金额：
$ 2.3万
依托单位：
Yamagata University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2005
项目状态：
已结题

项目摘要

The purpose of this study is to develop new methods for structure control of polymers using "magneto-processing" and to produce novel polymer products having excellent properties. Moreover, we have prepared novel functional polymers well-adapted to the magneto-processing, and investigated the fine structures and properties of the polymers.We have synthesized side-chain liquid crystalline polymers, liquid crystalline dendrimers, and ultra-violet(UV)-curable liquid crystal monomers which have high diamagnetic susceptibility. In addition, carbon fibers and multi-wall carbon nanotubes in polymer matrices have been oriented under magnetic field to improve their electrical conductivity.The mesogenic groups of side-chain liquid crystalline polymers, polyguanamines, have been oriented under magnetic field on slow cooling process from the melts. The liquid crystalline dendrimers could be oriented in any direction in the smectic phase using magnetic fields. It is comparatively easy to align the … More liquid crystalline dendrimers under magnetic field, because of their high diamagnetic susceptibility, low viscosity, and no entanglement.Introducing photo-curable chalconic groups to the polymer fixed the magneto-orientated structure using photo-crosslinkage. The polymer can be aligned parallel to the plane of polarization by applying polarized UV. Moreover, higher orientation has been achieved by double application of polarized UV and magnetic field. Three-dimensional oriented structures could be successfully formed and fixed in the polymer films using the UV-curable monomers by magnetic-field application and photo-polymerization : hybrid orientation and periodically changed orientation. These films exhibit excellent optical properties to be applicable as various optical filters.The carbon fiber and multi-wall carbon nanotube have been highly oriented perpendicular to the polymer film and formed network structures in the matrices. The films exhibited high electric conductivity and optically transparent. Thus, novel procedure of electroconductive plastic film have been developed by using the magneto-processing. Less

本研究的目的是开发利用“磁处理”技术控制聚合物结构的新方法，并生产出性能优良的新型聚合物产品。此外，我们还制备了适合于磁加工的新型功能聚合物，并对聚合物的精细结构和性能进行了研究。我们合成了具有高抗磁性的侧链液晶聚合物、液晶树枝状大分子和紫外光(UV)固化液晶单体。此外，碳纤维和多壁碳纳米管在聚合物基质中被磁场取向以提高其导电性，侧链液晶聚合物聚鸟胺在磁场作用下从熔体缓慢冷却过程中被取向。在磁场作用下，液晶树枝状大分子可以在近晶相中沿任意方向取向。将…对齐相对容易在磁场作用下，液晶树枝状大分子由于具有高抗磁化率、低粘度、无缠结等优点，在聚合物中引入光固化的查尔酮基团，通过光交联法固定了磁取向结构。通过施加偏振紫外光，聚合物可以平行于偏振面排列。此外，通过极化紫外光和磁场的双重作用，获得了更高的取向。紫外光固化单体通过磁场作用和光聚合可以成功地在聚合物薄膜中形成并固定三维取向结构：混合取向和周期性改变取向。碳纤维和多壁碳纳米管垂直于聚合物膜高度取向，并在基质中形成网络结构。该薄膜具有高导电性和光学透明性。因此，利用磁处理技术开发了导电塑料薄膜的新工艺。较少