Tanaka Shingo, Takezawa Yoshitaka, Kanie Kiyoshi, Muramatsu Atsushi
Research & Development Group, Hitachi, Ltd., 7-1-1 Omika, Hitachi 319-1292, Ibaraki, Japan.
Institute of Multidisciplinary Research for Advanced Material, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Miyagi, Japan.
ACS Omega. 2023 Aug 31;8(36):32365-32371. doi: 10.1021/acsomega.3c01498. eCollection 2023 Sep 12.
The molecular orientation of a liquid crystalline (LC) epoxy resin (LCER) on silane coupling surfaces of amorphous soda-lime-silica glass substrates was investigated. The LC epoxy monomer on the silane coupling surfaces of the substrates was revealed to form a smectic A (SmA) phase with planar alignments because of the relatively low surface free energy. An LCER with a curing agent, however, formed a homeotropically aligned SmA structure by curing on a substrate surface modified using a silane coupling agent with amino groups. This formation of homeotropic alignment was considered due to the attribution of the reaction between the amino group on the surface of the substrate and the epoxy group of the LCER. The homeotropic alignment had a relatively high orientation parameter of 0.95. Therefore, it is expected to possess high thermal conductivity and be applied as high-thermal-conductivity adhesives or packaging materials for electrical and electronic devices.
研究了液晶环氧树脂（LCER）在非晶态钠钙硅玻璃基板的硅烷偶联表面上的分子取向。由于表面自由能相对较低，基板硅烷偶联表面上的液晶环氧单体形成了具有平面排列的近晶A（SmA）相。然而，含有固化剂的LCER在使用含氨基硅烷偶联剂改性的基板表面上固化时，形成了垂直排列的SmA结构。这种垂直排列的形成被认为是由于基板表面的氨基与LCER的环氧基之间的反应。垂直排列具有相对较高的取向参数0.95。因此，预计其具有高导热性，并可作为高导热粘合剂或用于电气和电子设备的包装材料。
