2020 Volume 41 Issue 3 Pages 122-128
High performance epoxy resins are required by advancement of functional material fields. As a measure for this purpose, there are liquid crystalline epoxy resins having a mesogen unit, but they have a problem in solvent solubility due to their high melting points. As a result of studying epoxy resin having a diphenylene ether structure, it was found to give a crystalline cured product with a high melting point (185.6℃). The crystallinity of the cured product was estimated to be 52% from XRD measurement. Corresponding to this high crystallinity, CTE decreased in addition to the improvement in thermal conductivity. The moisture permeability was 0.48g/m2･day, which was an order of magnitude lower than that of the amorphous cured product. Furthermore, as a result of evaluation as a molding material, the heat distortion temperature increased significantly to 183℃.
