감마선이 알칼리 리그닌의 분자구조에 미치는 영향 = Effect of Gamma Ray on Molecular Structures of Alkali-Lignin

다국어 초록 (Multilingual Abstract)

Lignin is one of the natural macromolecules. Every year large amount of lignin arisesfrom the cellulose production as a by-product worldwide. The use of lignin as a precursor tocarbonaceous materials has gained interest due to its low cost and high availability. Therefore, weimproved the properties of alkali-lignin by exposing to gamma ray in this study. The alkali-ligninis irradiated by Gamma ray irradiation with varying doses. The char yields of alkali-lignin wereinvestigated by increasing up to 50 kGy. The cross-linking and bond scission of alkali-lignin occursimultaneously during gamma ray irradiation. The crosslinking was predominantly acceleratedby gamma ray irradiation up to 50 kGy. Bond scission predominantly occurs between 50 and 500kGy. ESCA analysis indicated that the alcoholic carbon increase up to 50 kGy. Solution viscositywas increased as absorbed dose increased up to 20 kGy. In addition, the aromatic ring was notinfluenced by irradiation at doses ranging from 20 to 500 kGy as shown in FT-IR results.