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Multifunctional Thin Films from Programmed Reactive Liquid Crystal Monomers
정광운 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
Anisotropic liquid crystal (LC) networks prepared from reactive mesogens (RM) have numerous advantages in optoelectronic devices especially because of the excellent processability. To fabricate the robust LC thin films with excellent thermal, chemical and mechanical stabilities, the photo-polymerization of anisotropically pre-oriented RMs should be conducted on the optimized conditions. Since the final physical properties of anisotropic LC networks depend on chemical functions and physical intermolecular interactions, the hierarchical superstructures of the programmed RMs with specific chemical functions should be controlled on the different length and time scales before polymerization. The presentation describes the fundamental characteristics and recent research interests of anisotropic LC networks, elastomers and gels fabricated using various programmed RMs.
정광운,Yousuke Kawahito,Seiji Katayama 한국정밀공학회 2014 International Journal of Precision Engineering and Vol.1 No.1
This study was performed to investigate the joining possibility and characteristics of the dissimilar joint between carbon fiber reinforced plastics (CFRP) and amorphous polyethylene terephthalate (PET) plastic using a continuous wave (cw) diode laser with a line-shaped beam. Tensile shear test results demonstrated that strong lap joints with a maximum load of 3200 N could be produced under some proper conditions, and base amorphous PET plastic sheet was elongated without fracture. It was confirmed from SEM observation that the dissimilar lap joint was tightly bonded near the joint interface between two materials, and simultaneously integrated by the interdiffusion and mixing process at the joint interface of two materials through rapid melting, solidification and cooling during laser joining. Through high speed video camera observation, the joining phenomena generating in the laser irradiated part during laser joining of CFRP to PET was obviously identified. Consequently, it was revealed that strong dissimilar lap joint of CFRP to engineering plastic could be possible by a direct laser irradiation without adhesive bonds or mechanical fasteners.