Journal of the Korean Wood Science and Technology

The Korean Society of Wood Science & Technology (한국목재공학회)
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Preparation of Lignocellulose Nanofiber by Mechanical Defibrillation After Pretreatment Using Cosolvent of Ionic Liquid and DMF

이온성 액체/DMF 혼합용매 전처리 후 기계적 해섬을 통한 리그노셀룰로오스 나노섬유의 제조

  • Han, Song-Yi (Department of Forest Biomaterials Engineering, Kangwon National University) ;
  • Park, Chan-Woo (Department of Forest Biomaterials Engineering, Kangwon National University) ;
  • Lee, Seung-Hwan (Department of Forest Biomaterials Engineering, Kangwon National University)
  • 한송이 (강원대학교 산림바이오소재공학과) ;
  • 박찬우 (강원대학교 산림바이오소재공학과) ;
  • 이승환 (강원대학교 산림바이오소재공학과)
  • Received : 2017.01.25
  • Accepted : 2017.04.18
  • Published : 2017.05.25
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Abstract

In this study, lignocellulose nanofibrils (LCNFs) were prepared from Pussy willow wood powder by disk-milling after pretreatment using the cosolvent of 1-ethyl-3-methylimidazolium acetate ([EMIM]Ac) and N,N-dimethylformamide (DMF) with different mixing ratios for different time. All pretreated samples showed native cellulose I polymorph and cellulose crystallinity was lowest when cosolvent of DMF with 30% [EMIM]Ac was used. Average crystallite size of raw material and the pretreated product by MDF and its cosolvent with 10% [EMIM]Ac was found to be about 3.2 nm and decreased with increasing pretreatment time at the DMF cosolvent with 30% [EMIM]Ac. Defibrillation efficiency was improved by loosening wood cell wall structure by the pretreatment using co-solvent system of [EMIM]Ac and DMF.

본 연구는 리그노셀룰로오스의 주성분 용해에 우수하다고 알려진 이온성 액체인 1-ethyl-3-methylimidazolium acetate ([EMIM]Ac)와 셀룰로오스와 친화성이 있는 유기용매인 dimethylformamide (DMF)의 혼합용매를 이용하여 갯버들 목분을 처리한 후, 디스크밀 해섬에 의한 리그노셀룰로오스 나노섬유를 제조하고 그 특성을 평가하였다. 무처리샘플과 DMF 및 [EMIM]Ac가 10과 30% 포함된 혼합용매로 목분의 고형분량을 15%로 선정하였다. 전처리물의 X선 회절도로부터 모든 샘플이 셀룰로오스 I의 패턴을 나타냈으며, 상대결정화도는 [EMIM]Ac가 30% 포함된 혼합용매로 2시간 처리한 전처리물이 가장 낮았다. 무처리 및 DMF와 [EMIM]Ac가 10% 포함된 혼합용매로 처리한 전처리물의 평균결정크기는 약 3.2 nm였으며, [EMIM]Ac가 30%까지 포함되고 처리 시간이 경과할수록 다소 감소하는 경향을 나타내었다. 혼합용매의 사용을 통한 전처리물의 목재세포벽 구조의 완화로 해섬 효율이 향상되었으며, 전처리 시간 및 해섬 시간이 경과할수록 비표면적이 증가하는 경향을 나타내었다.

Keywords

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