LbL 다층흡착에 의한 나노피브릴화 셀룰로오스의 표면 개질과 현탁액의 탈수성에 미치는 영향 (Surface Modification of Nanofibrillated Cellulose by LbL (Layer-by-Layer) Multilayering and its Effect on the Dewatering Ability of Suspension)

서지정보

· 발행기관 : 한국펄프·종이공학회
· 수록지 정보 : 펄프종이기술 / 46권 / 1호 / 46 ~ 55페이지
· 저자명 : 심규정, 윤혜정, 안정언, 이제곤, 이혜윤, 조연희

초록

In this study, we modified the surface of nanofibrillated cellulose (NFC) through LbL (Layer-by-Layer)multilayering process with polyelectrolytes and investigated the effects of the NFC modification on thecharge of NFC surface and the dewatering ability of NFC suspension. The multilayering process wasdone onto NFC fibers using polydiallyldimethylammonium chloride (PDADMAC) and poly-sodium4-styrene sulfonate (PSS) under different dosage and washing conditions. When the washing was carriedout in every adsorption stage, the modified NFC had strong cationic or anionic charge depending on thetype of polyelectrolyte in the outermost layer and the dewatering ability was not affected. In the case ofno washing treatment or washing in the final adsorption stage, however, the zeta potential of NFC wasclose to an isoelectric point so that the dewatering ability increased remarkably. Low addition level ofpolyelectrolytes also showed the similar results. The mixing of NFC suspensions with opposite chargeresulted in higher network strength and improved dewatering ability due to the flocculation.

영어초록

In this study, we modified the surface of nanofibrillated cellulose (NFC) through LbL (Layer-by-Layer)multilayering process with polyelectrolytes and investigated the effects of the NFC modification on thecharge of NFC surface and the dewatering ability of NFC suspension. The multilayering process wasdone onto NFC fibers using polydiallyldimethylammonium chloride (PDADMAC) and poly-sodium4-styrene sulfonate (PSS) under different dosage and washing conditions. When the washing was carriedout in every adsorption stage, the modified NFC had strong cationic or anionic charge depending on thetype of polyelectrolyte in the outermost layer and the dewatering ability was not affected. In the case ofno washing treatment or washing in the final adsorption stage, however, the zeta potential of NFC wasclose to an isoelectric point so that the dewatering ability increased remarkably. Low addition level ofpolyelectrolytes also showed the similar results. The mixing of NFC suspensions with opposite chargeresulted in higher network strength and improved dewatering ability due to the flocculation.

참고자료

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