새로운 치환기 도입 통한 시아노아크릴레이트계 자외선 흡수제의 흡수변화 및 합성

Abstract

There are ultraviolet rays that affect plastic, rubber etc. from the sun. ultraviolet absorber (UVA) is used to protect products form these ultraviolet rays. There are various kinds of things, such as benzophenone, benzotriazole, triazine, oxanilide and cyanoacrylate. This thesis focuses on improving the UVA of cyanoacrylate units. Because Existing process uses imine, which includes nitrogen, the environmental problem is encountered. The new process can solve environmental problems because it uses benzophenone as raw material. we establish conditions of reaction such as temperature, time, catalyst, and solvents. During the absorption mechanism, the protons become excited and energy dissipated through thermal energy releases. To influence this mechanism, we have introduced electron withdrawing group and electron donating group as substituent. We conducted various analyses such as thermogravimetric analysis (TGA) and optical properties change etc. TGA graph showed that every compound have good thermal resistance. Electron donating group subsisted compound of max absorption wavelength move to a long wavelength. Also their absorption intensity was increased.