| 초록 |
Ultraviolet (UV) absorber is one of the effective ways to prevent polymer photodegradation. However, commercial UV absorbers have low thermal stability and are difficult to apply to polymers that require a high-temperature process. To improve this drawback, we synthesized highly durable UV absorbers based on hydroxyphenyl benzotriazole.The synthesized UV absorbers (PBT, DSBT, DPBT) are dimers using a linker moiety (disulfide, phenyl, biphenyl). The dimers increased the thermal stability by increasing the molecular weight, but the solubility decreased. The transmittance of the UV absorber + Polyimide(PI) films baked at 250℃ was measured to verify the thermal and light stability of UV absorber in the films. As a result, the dimeric UV absorbers + PI film had higher thermal and light stability than monomeric UV absorber + PI film. In this study, we synthesized and characterized dimeric UV absorbers and showed that the UV absorbers could apply to PI films in a high-temperature process. |
