기능화된 탄소나노튜브의 카르복실산이 전기방사된 폴리아크릴로니트릴 섬유의 물성에 미치는 영향

박옥경; 김주형; 이성호; 이중희; 정용식; 김준경; 구본철; Ok-Kyung Park; Ju-Hyung Kim; Sungho Lee; Joong Hee Lee; Yongsik Chung; Junkyung Kim; Bon-Cheol Ku

Polymer(Korea), Vol.35, No.5, 472-477, September, 2011

Effect of Carboxylic Acid Group of Functionalized Carbon Nanotubes on Properties of Electrospun Polyacrylonitrile (PAN) Fibers

박옥경^{1, 2}, 김주형^{3, 2}, 이성호², 이중희 ¹, 정용식 ³, 김준경 ², 구본철^{2, †}

¹전북대학교 BIN융합공학과
²한국과학기술연구원 복합소재기술연구소
³전북대학교 유기소재파이버공학과

Ok-Kyung Park^{1, 2}, Ju-Hyung Kim^{3, 2}, Sungho Lee², Joong Hee Lee¹, Yongsik Chung³, Junkyung Kim², and Bon-Cheol Ku^{2, †}

¹Department of BIN fusion Technology, Chonbuk National University, Duckjin-dong 1Ga, 664-14, Jeonju, Jeollabuk-do 561-756, Korea
²Institute of Advanced Composites Materials, Korea Institute of Science and Technology, 864-9 Dunsan-ri, Bongdong-eup, Wanju-gun, Jeollabuk-do 565-902, Korea
³Department of Organic Materials and Fiber Engineering, Chonbuk National University, Duckjin-dong 1Ga, 664-14, Jeonju, Jeollabuk-do 561-756, Korea

E-mail:

초록

다중벽 탄소나노튜브(MWNT)의 표면이 산성기로 처리된 MWNT가 polyacrylonitrile(PAN) 섬유의 열적, 기계적 물성에 미치는 영향을 알아 보고자 질산, 황산으로 처리한 MWNT(O-MWNT)를 디아조늄염 반응을 이용하여 MWNT 표면에 이소프탈산(isophthalic acid)을 추가로 도입하였다. O-MWNT와 비교하여 볼 때 이소프탈산으로 처리된 MWNT(IPA-MWNT)가 극성용매 내에서 더 우수한 분산 안정성을 나타내었으며 이를 호모 PAN과 혼합하여 필름을 제조한 후 공기 중에서 열안정화 반응을 모사하였을 때 호모 PAN과 비교시 발열량이 감소하였다. PAN 공중합체와 IPA-MWNT를 혼합한 용액을 전도성 수조 콜렉터를 이용하여 전기방사를 한 결과 연속상의 배향된 섬유제조가 가능하였다. 1 wt%의 IPA-MWNT를 포함한 연속상의 전기방사된 PAN 섬유는 순수한 PAN 섬유와 비교하여 볼 때 인장강도가 100% 증가하였으며, 탄성률은 160% 증가되었다.

To study the effects of the acid group of functionalized MWNT (multiwalled carbon nanotube) on the thermal and mechanical properties of polyacrylonitrile(PAN) nanofibers, acid (H2SO4 /HNO3) treated MWNT (O-MWNT) were further functionalized by diazonium salt reaction with 5- aminoisophthalic acid (IPA). Compared to O-MWNT, IPA-MWNT with isophthalic acid group showed a better dispersion stability in polar solvents and IPA-MWNT/PAN composite film displayed lower heat of reaction (ΔH ) than that of homo PAN when stabilized under air atmosphere. The continuous electrospun fibers were prepared using a conductive water bath. PAN fibers containing 1 wt% of IPA-MWNT showed an increase of tensile strength by 100% and tensile modulus by 240% compared to the PAN fibers without IPA-MWNT.

Keywords:polyacrylonitrile;carbon nanotubes;carbon fibers;electrospinning;mechanical properties.

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