Journal of the Korean Wood Science and Technology

The Korean Society of Wood Science & Technology (한국목재공학회)
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Preparation of Cellulose Nanofibrils and Their Applications: High Strength Nanopapers and Polymer Composite Films

셀룰로오스 나노섬유의 제조 및 응용: 고강도 나노종이와 고분자복합필름

  • Lee, Sun-Young (Division of Wood Processing, Department of Forest Resources Utilization, Korea Forest Research Institute) ;
  • Chun, Sang-Jin (Division of Wood Processing, Department of Forest Resources Utilization, Korea Forest Research Institute) ;
  • Doh, Geum-Hyun (Division of Wood Processing, Department of Forest Resources Utilization, Korea Forest Research Institute) ;
  • Lee, Soo (Dept. of Chemical Engineering, Changwon National University) ;
  • Kim, Byung-Hoon (Seoul Science High School) ;
  • Min, Kyung-Seon (Seoul Science High School) ;
  • Kim, Seung-Chan (Seoul Science High School) ;
  • Huh, Yoon-Seok (Seoul Science High School)
  • 이선영 (국립산림과학원 녹색자원이용부 환경소재공학과) ;
  • 전상진 (국립산림과학원 녹색자원이용부 환경소재공학과) ;
  • 도금현 (국립산림과학원 녹색자원이용부 환경소재공학과) ;
  • 이수 (창원대학교 화공시스템공학과) ;
  • 김병훈 (서울과학고등학교) ;
  • 민경선 (서울과학고등학교) ;
  • 김승찬 (서울과학고등학교) ;
  • 허윤석 (서울과학고등학교)
  • Received : 2011.01.04
  • Accepted : 2011.03.09
  • Published : 2011.05.25
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Abstract

Cellulose nanofibrils (CNF) with 50~100 nm diameter were manufactured from micro-size cellulose by an application of a high-pressure homogenizer at 1,400 bar. High strength nanopapers were prepared over a filter paper by a vacuum filtration from CNF suspension. After reinforcing and dispersing CNF suspension, hydroxypropyl cellulose (HPC) and polyvinyl alcohol (PVA)-based composites were tailored by solvent- and film-casting methods, respectively. After 2, 4, 6 and 8 passes through high-pressure homogenizer, the tensile strength of the nanopapers were extremely high and increased linearly depending upon the pass number. Chemical modification of 1H, 1H, 2H, 2H-perfluorodecyl-triethoxysilane (PFDTES) on the nanopapers significantly increased the mechanical strength and water repellency. The reinforcement of 1, 3, and 5 wt% CNF to HPC and PVA resins also improved the mechanical properties of the both composites.

본 연구에서는 마이크로 입자의 셀룰로오스를 1,400 bar의 압력에서 고압 호모지나이저(high-pressure homogenizer)를 이용하여 직경이 약 50~100 nm의 셀룰로오스 나노섬유를 제조하였다. 나노섬유 현탁액을 감압 여과하여 고강도 나노종이를 제조하였다. 용매 및 필름캐스팅법을 이용하여 나노섬유를 hydroxypropyl cellulose (HPC)와 polyvinyl alcohol (PVA) 수지에 보강 및 분산시켜 복합필름을 제조하였다. 고압 호모지나이저 통과 횟수를 2, 4, 6, 8까지 점점 증가시켰을 때, 나노종이의 인장강도가 매우 높았으며 통과횟수가 증가할수록 직선적으로 크게 향상되었다. 1H, 1H, 2H, 2H-perfluorodecyl-triethoxysilane (PFDTES)로 나노종이를 화학 적 개질한 결과, 나노종이의 기계적 강도와 내수성이 크게 향상되었다. 셀룰로오스 나노섬유를 HPC와 PVA 수지에 중량대비 1, 3 및 5%로 보강시켰을 때, HPC와 PVA 복합필름의 기계적 강도가 크게 향상되었다.

Keywords

References

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