세척 방법에 따른 유기용매 미세화 시료의 용해 및 재생 특성

Micronized-residues (R) was prepared by an organosolv pulping method and its residual lignin content was controlled via washing processes with water, acetone, and alkali solutions to elucidate their dissolution behavior in sodium hydroxide (NaOH)/urea along with their regeneration properties in a coagulation bath. It was found that the dissolution yield of R washed by water (Water-R) was 98.9% in the NaOH/urea solution and other samples treated by alkali and acetone solutions were dissolved more than 90%. All of the dissolved samples, except for Water-R, was coagulated in the 5% sulfuric water bath and successfully regenerated into cellulose films, suggesting that the ratio of lignin to carbohydrate in the dissolved sample plays a crucial role in the dissolution/regeneration process. Additionally, the tensile index of the cellulose film regenerated by the acetone-washed sample (Acetone-R) was higher than other films due to a 20% reduction in lignin content and no changes of sugar compositions compared to its original micronized-residues.