셀룰로오스 나노크리스탈 강화 셀룰로오스 아세테이트 나노복합소재 제조 및 특성 Preparation and Characteristics of Cellulose Acetate Based Nanocomposites Reinforced with Cellulose Nanocrystals (CNCs)원문보기
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)
셀룰로오스아세테이트(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.
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.
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 reinfo...
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.
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.
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문제 정의
On the other hand, there are relatively few studies on the CA production using molten extrusion and injection methods which are advantageous for mass production for industrialization. Therefore, the aims of this study are to introduce the development of CA polymer composite materials using CNCs as a reinforcing agent by applying an extrusion and injection method and to investigate the mechanical and thermal properties of CA composite materials made according to the CNCs content.
가설 설정
2. a) Tensile properties and b) Flexural properties of CA/CNC nanocomposites as a function of CNCscontents.
3. TGA results of CA/CNCs nanocomposites: a) weight loss, and b) derivative weight as a function of temperature.
제안 방법
This study analyzed how the addition of CNCs using the predispersion and the extrusion and injection methods affects the fabrication and properties of CA nanocomposites. In fabricating CA composites, the predispersion method has improved the dispersibility of CNCs in the material, which leads to the reinforcing effect that improves the strength of the composite material.
To investigate the properties of CA nanocomposites based on the CNC's content, we divided the CNCs content into 0, 1, 3, 5, and 10 wt.
대상 데이터
). The five specimens were tested according to the ASTM D638 and D790methods and the test speed was 10 mm/min. The thermal properties of composites were obtained using TGA(Thermogravimetric Analyzer, Perkin-Elmer TGA8000)at a 10 ℃/min in the 40 ℃ to 600 ℃ temperature range under helium.
성능/효과
%, flocculation associated with the percolation effect of CNCs occurred, resulting in a decrease in strength. It was confirmed that the addition of CNCs did not improve the thermal stability while reducing the pyrolysis temperature of CA nanocomposites slightly. However, it can be overcome by surface modification of CNCs and injection of flammable materials.
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