화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Polymer(Korea), Vol.44, No.4, 512-518, July, 2020
DOI10.7317/pk.2020.44.4.512  Export Citation
점착성 설탕시럽을 이용하여 탄소나노튜브의 얽힘을 푸는 새로운 접근방법
A Novel Approach to Disentangle Carbon Nanotubes Using Viscous Sugar Syrup
채동욱†, Stephen C. Hawkins1, , 엄영호2, 한유경3, 신봉섭, 전종영
  • 경북대학교 섬유공학과
  • 1School of Mechanical and Aerospace Engineering Queen’s University Belfast, BT9 5AH, UK
  • 2부경대학교 고분자공학과
  • 3경북대학교 융복합시스템공학부
Dong Wook Chae†, Stephen C. Hawkins1, Chi P. Huynh2, Youngho Eom3, Youkyung Han4, Bong-Seob Shin, and Jong-Young Jeon
  • Department of Textile Engineering, Kyungpook National University, Sangju 37224, Korea
  • 1School of Mechanical and Aerospace Engineering, Queen’s University Belfast, BT9 5AH, UK
  • 2Lintec of America, INC. Inc. R&D Division Nano-Science and Technology Center, Richardson, Texas 75081, USA
  • 3Department of Polymer Engineering, Pukyong National University, Busan 48513, Korea
  • 4School of Convergence & Fusion System Engineering, Kyungpook National University, Sangju 37224, Korea
E-mail:
초록
끈적끈적한 설탕시럽을 사용한 다중벽 탄소나노튜브(MWNT) 번들의 풀림이 연구되었다. 시럽은 수크로스, 글루코스, 프럭토스와 증류수를 1:1:1:0.8의 무게 비율로 혼합하여 제조되었다. 고점도의 물질을 위한 디스크형태의 믹서가 시럽과 MWNTs를 혼합하기 위하여 제작되었다. MWNT의 효과적인 풀림을 위한 최적의 혼합조건을 알기 위하여 MWNT/설탕시럽 함량 비율을 각 제조단계에서 다양하게 하였다. 설탕시럽에서 나노튜브의 분산상태를 정량적으로 평가하기 위해 디지털영상처리기술이 광학현미경 이미지에 사용되었다. 이것은 MWNT의 균일한 분산이 시럽을 한 번에 첨가하기보다는 각 단계에서 점차적으로 첨가함으로써 얻어진다는 것을 보여주었다. 혼합물의 동적점도가 MWNT의 전체적인 분산상태를 평가하기 위해서 측정되었다. MWNT 첨가가 시럽의 동적점도를 증가시켰고 분산정도가 증가하면서 동적점도가 감소함을 보였다. 이 새로운 분산방법을 고분자 복합체에 적용가능한지 입증하기 위해서 분산된 MWNT가 폴리비닐알콜과 폴리아크릴로니트릴에 옮겨졌고 각 매트릭스에서 재뭉침없이 균일하게 분산됨을 보였다.
The disentanglement of multi-walled carbon nanotube (MWNT) bundles by using a sticky sugar syrup was explored for the first time. The syrup was prepared by mixing sucrose, glucose, fructose, and distilled water in a 1:1:1:0.8 weight ratio. A disk-type mixer suitable for high-viscosity materials was built to mix this syrup with MWNTs. To find out the optimum mixing conditions for effective disentanglement of MWNTs, the content ratio of MWNTs to sugar syrup was varied at each mixing step. Digital image processing technique was used with optical micrographs to quantitatively estimate the dispersion of nanotubes in sugar syrups. This revealed that the most homogeneous dispersion of MWNTs in the sugar syrup was achieved by gradually adding the syrup at each mixing step rather than all at once at the initial mixing step. The dynamic viscosity (η') of the mixtures was measured to evaluate the overall dispersion state of MWNTs. The incorporation of MWNTs increased the η' of sugar syrup, exhibiting a decreased η' with an increase in the degree of dispersion. To validate this novel dispersion method for polymer composites, disentangled MWNTs were transferred into poly(vinyl alcohol) (PVA) and polyacrylonitrile (PAN); they exhibited uniform dispersion in each polymer matrix, without reagglomeration occurred.
Keywords:sugar syrup;disentanglement;multi-walled carbon nanotube;dynamic viscosity;composite
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