Article
  • Electrical and Physical Properties of Magnetite-Filled NBR
  • Choi KC, Lee EK, Choi SY, Park SJ
  • 마그네타이트가 충전된 NBR의 전기적 특성 및 물성 연구
  • 최교창, 이은경, 최세영, 박수진
Abstract
In this work, the effect of different contents of Fe3O4 and temperature variation on the electrical conductivity (σ) in the polar acrylonitrile butadiene rubber (NBR)/Fe3O4 (magnetite) mixture system was investigated. It was found that the percolation threshold concept holds true for the conductive particle-filled composites where σ indicates a nearly sharp increase when the concentration of magnetite in the mixture exceeds 22%. The temperature dependence of σ was thermally activated below and at the percolation threshold (Pc). Magnetite acted as reinforcing and conductive filler for NBR. At room temperature and higher voltages, the electrical current was proportional to the square of voltage (I∝V(2)) for the composites which contain 30 phr of magnetite. Moreover, it was shown that the composites with magnetite of 50 phr showed the highest tensile strength and elongation at break, which was due to the formation of optimal physical interlock and crosslinking. The results of 100%, 200%, and 300% Young moduli said that the moduli are largely correlated with reinforcement effect of magnetite and viscosity of the blends from torque curve.

본 연구에서는 Fe3O4 (magnetite)의 함량 변화와 온도 변화가 NBR/Fe3O4 혼합물의 전기전도도 (σ)에 미치는 영향을 조사하였다. 최소 최적 혼합비 (percolation threshold, Pc) 개념이 본 연구에서 제조한 전도성 입자가 충전된 복합체에 적용되며, 혼합물내 Fe3O4의 농도가 22%를 초과할 때 σ가 급격히 증가함을 확인하였다. σ의 온도 의존성은 Pc 또는 그 이하에서 열적으로 활성화되며, 마그네이트가 NBR 고무의 강화 및 전도성 충전제로서의 역할을 할 수 있음을 조사하였으며, 충전제 함량이 30 phr인 복합체는 실온에서 고전압을 걸어줄 경우 전류는 전압제곱에 비례한 것으로 나타났다. 또한, 50 phr의 마그네이트가 충전된 복합체가 최적의 물리적 가교점으로 인하여 가장 우수한 인장강도와 파단시 신장율을 보였으며 모듈러스가 마그네이트의 강화효과 및 혼합물의 토오크 곡선으로부터 얻은 점도와 관련이 있음을 확인하였다.

Keywords: electrical conductivity; percolation threshold; physical interlock; reinforcement effect

References
  • 1. Skotheim TAHandbook of Conducting Polymers, T.A. Skotheim, Editor, Marcel Dekker, New York (1986)
  •  
  • 2. Salamone JCENcyclopedia of Polymeric Materials, J.C. Salamone, Editor, CRC Press, New York (1996)
  •  
  • 3. Pron A, Rannou P, Prog. Polym. Sci., 27, 135 (2002)
  •  
  • 4. Faez R, Gazotti WA, De Paoli MA, Polymer, 40(20), 5497 (1999)
  •  
  • 5. Sau KP, Chaki TK, Khastgir D, Polymer, 39(25), 6461 (1998)
  •  
  • 6. Wan MX, Li M, Li JC, Liu ZX, Thin Solid Films, 259(2), 188 (1995)
  •  
  • 7. Leyva ME, Barra GMO, Soares BG, Synth. Met., 123, 443 (1998)
  •  
  • 8. Park SJ, Kim JS, J. Colloid Interface Sci., 232(2), 311 (2000)
  •  
  • 9. Kumar D, Sharma RC, Eur. Polym. J., 34, 1053 (2001)
  •  
  • 10. Bauer GHandbook of Preparative Inorganic Chemistry, G. Bauer, Editor, Academic Press, New York, Vol. 2 (1969)
  •  
  • 11. Gillot B, Rousset A, Paris J, Barret PInternational Symposium on the Reactivity of Solids, 8th Ed., B. Gillot, A. Rousset, J. Paris, and P. Barret, Editors, Plenum Press, New York (1977)
  •  
  • 12. Faez R, Paoli MA, Eur. Polym. J., 37, 1139 (2001)
  •  
  • 13. El-Mansy MK, Shash NM, Maklad MH, Diefallah EM, Mater. Chem. Phys., 52, 71 (1998)
  •  
  • 14. Ali MH, Hashem AA, J. Mater. Process. Technol., 68, 168 (1997)
  •  
  • 15. Malcolm DRadiation Chemistry of Macromolecules, D. Malcolm, Editor, Academic Press, New York (1972)
  •  
  • 16. Faez R, Paoli MA, Eur. Polym. J., 37, 1139 (2001)
  •  
  • 17. Ventras JS, Duda JL, Ling HC, Macromolecules, 21, 1470 (1988)
  •  
  • 18. Park SJ, Seo MK, Carbon, 39, 1229 (2001)
  •  
  • 19. Park SJ, Cho MS, Lee JR, J. Colloid Interface Sci., 226(1), 60 (2000)
  •  
  • 20. Carmona F, Ravier J, Carbon, 40, 151 (2002)
  •  
  • Polymer(Korea) 폴리머
  • Frequency : Bimonthly(odd)
    ISSN 0379-153X(Print)
    ISSN 2234-8077(Online)
    Abbr. Polym. Korea
  • 2023 Impact Factor : 0.4
  • Indexed in SCIE

This Article

  • 2003; 27(1): 40-45

    Published online Jan 25, 2003

  • Received on Jul 16, 2002
  • Accepted on Dec 4, 2002