Alignment control of liquid crystal molecules on the surface of inorganic particles for the development of high thermal conductive epoxy resin

2022 Fiscal Year Final Research Report

• Project/Area Number: 20K04301
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 19020:Thermal engineering-related
• Research Institution: Yamagata University
• Principal Investigator: Haba Osamu 山形大学, 大学院有機材料システム研究科, 教授 (70261328)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: 垂直配向 / 高分子配向剤 / ネマチック液晶

Outline of Final Research Achievements

First, we designed and synthesized an alignment agent without amino groups for a homeotropic orientation of nematic liquid crystal. As a result, copolyethers prepared from the copolymerization of an epoxide having a mesogenic group and an epoxide having an ethyleneoxy chain were found to have good properties. The next step was to synthesize a diepoxide with liquid crystalline groups for use in the preparation of epoxy resins. Diepoxides are required to exhibit a nematic phase over a wide temperature range from lower than the curing temperature to the temperature required for curing, but a single compound could not satisfy such a property. However, it was found that by mixing two different compounds, it was possible to tailor a diepoxide that exhibited a nematic phase over a relatively wide range.

Free Research Field

高分子合成化学

Academic Significance and Societal Importance of the Research Achievements

ネマチック液晶の垂直配向剤として、アミノ基を持たないポリマーが機能することを見いだした。垂直配向剤は液晶を必要とする用途において、均一な配向が必要な際に表面の面積の大小にかかわらず利用可能である。本課題で取り上げた電子材料の封止材の他に、液晶ディスプレイなどの用途にとって、アミノ基は電流のリークを誘起するため使用に制限があった。本課題で開発した配向剤を用いることで、このような用途への利用が広がる可能性がある。