Journal of the Korean Wood Science and Technology

The Korean Society of Wood Science & Technology (한국목재공학회)
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Preparation and Characteristics of Cellulose Acetate Based Nanocomposites Reinforced with Cellulose Nanocrystals (CNCs)

셀룰로오스 나노크리스탈 강화 셀룰로오스 아세테이트 나노복합소재 제조 및 특성

  • Gwon, Jae-Gyoung (National Forestry Research Institute, Forest Products Department, National Institute of Forest Science) ;
  • Lee, Dan-Bee (National Forestry Research Institute, Forest Products Department, National Institute of Forest Science) ;
  • Cho, Hye-Jung (National Forestry Research Institute, Forest Products Department, National Institute of Forest Science) ;
  • Lee, Sun-Young (National Forestry Research Institute, Forest Products Department, National Institute of Forest Science)
  • Received : 2018.08.17
  • Accepted : 2018.09.08
  • Published : 2018.09.25
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Abstract

Cellulose acetate (CA) has been widely utilized for composite materials due to its high transparency and thermal resistance. In this study, CNCs (cellulose nanocrystals) were reinforced in CA nanocomposites for fortifying mechanical properties of the composites. In addition, CA nanocomposites reinforced with CNCs were manufactured by extrusion/injection processes applied with CNC-predispersion method for achieving a high dispersion level of CNCs in the CA matrix. According to the analysis of mechanical properties, the CA nanocomposite with 3 wt% CNCs has the highest tensile and flexural strengths due to the reinforcing effect of CNC nanoparticles. Thermogravimetric analysis (TGA) showed that the addition of acid hydrolyzed CNCs slightly lowered the initial pyrolysis temperature of CA nanocomposite.

셀룰로오스 아세테이트(cellulose acetate, CA)는 높은 투명도와 열 저항성을 갖고 있어 복합소재 개발에 많이 응용되고 있다. 본 연구에서는 CA 복합재의 기계적 강도 개선을 위해 셀룰로오스 나노크리스탈 (cellulose nanocrystals, CNCs)을 강화제로 첨가하였다. CA 수지 내부에 CNCs의 고른 분산을 위해 선 분산(predispersion)법 적용 후, 압출 및 사출하는 제조 방식으로 CA 복합재를 제조하였다. 기계적 특성 분석 결과, CNCs를 3 wt% 첨가하였을 때 강화효과(reinforcing effect)로 인해 최대 인장강도와 굴곡강도 값을 보임을 확인하였다. 열중량 분석법을 이용한 열분해 거동 분석을 통해 황산 처리된 CNCs의 첨가는 CA 복합소재의 열안정성을 약간 감소시키는 결과를 얻었다.

Keywords

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