Elastomers and Composites

The Rubber Society of Korea (한국고무학회)
권호 표지

Influences of Liquid Rubber on the Surfacial and Mechanical Properties of Epoxy Composites

에폭시 복합체의 표면 및 기계적 특성에 미치는 액상고무의 효과

  • 최세영 (청주대학교 응용화학과) ;
  • 추정민 (청주대학교 응용화학과) ;
  • 이은경 (청주대학교 응용화학과)
  • Published : 2008.06.30
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Abstract

Epoxy resins are thermoset polymers that exhibit good adhesion, creep resistance, heat resistance, and chemical resistance. These polymers, however, give poor resistance to crack propagation and low impact strength. In this study, epoxy/carboxyl-terminated butadiene acrylonitrile (CTBN) and epoxy/amine-terminated butadiene acrylonitrile (ATBN) composites were prepared with different ratio of CTBN and ATBN to improve low impact strength of epoxy resin. The impact strength of epoxy/elastomeric composites shows high values with increasting nonpolar surface free energy while the tensile strength and the glass transition are decreased. The highest surface free energy, impact strength observed when 15 phr CTBN and 15 phr ATBN added, respectively. It can be concluded that as liquid rubber to improve impact strength of epoxy resin, ATBN is more preferable to CTBN.

에폭시 수지는 우수한 접착력, 높은 강도, 내크리프성, 내열성, 내화학성을 나타내는 열경화성 고분자이지만, 매우 깨지기 쉬우며 균열성장에 대한 낮은 저항성을 보여 낮은 충격강도를 보인다. 그러므로 본 연구에서는 에폭시 수지에 carboxyl-terminated butadiene acrylonitrile (CTBN) 및 amine-terminated butadiene acrylonitrile(ATBN)을 변량 첨가하여 에폭시 수지의 낮은 충격강도를 향상시키고자 한다. 에폭시/CTBN, 에폭시/ATBN복합체의 충격강도(impact strength)가 큰 값을 나타낼 때 표면자유에너지(surface free energy)의 비극성 값 또한 가장 큰 값을 보였으며, 반면에 인장강도와 유리전이온도는 감소함을 보였다. CTBN 및 ATBN을 각각 15 phr 첨가한 에폭시 복합체가 높은 표면자유에너지와 충격강도를 보였다. 결론적으로 액상고무의 첨가로 에폭시 수지의 취성을 향상시켰으며, 에폭시/CTBN보다는 에폭시/ATBN복합체의 물성이 더 우수하다고 사료된다.

Keywords

References

  1. C. K. An, "에폭시 수지의 화학, 합성과 응용", Elastomer, 31, 130 (1996)
  2. Olabisi, Robeson, and Shaw, "Polymer-Polymer Miscibility", Academic Press, New York, 1982
  3. Paul and Bucknall, "Polymer-Blends", John Wiley ＆ Sons, New York, 2000
  4. C. A. May, "Epoxy Resins: Chemistry and Technology", 2nd Ed., Marcel Dekker, New York, 1998
  5. S. V. Rosato, D. P. Dimattia, and D. V. Rosato, "Disigning with Plastics and Composites", Nostrand Reinhold, New York, 1991
  6. Kunz SC, Sayre JA, and Assink RA. "Morphology and toughness characterization of epoxy resin modified with amine and carboxyl-terminated rubbers", Polymer, 23, 906 (1982)
  7. J. H. Lee, "고분자 재료화학", 삼광출판사, 2002
  8. H. S. Jung, J. S, Jang, and J. S. Shim, "Toughness Improvement of High performance Epoxy Resin: II. Morphology Study of Modified Epoxy Resin", Polymer, 17, 513 (1993)
  9. L. T. Manzione, J. K. Gillham, and C. A. "McPherson, Rubber-modified epoxies. I. Transitions and morphology", J. Appl. Polym. Sci., 26, 889 (1981) https://doi.org/10.1002/app.1981.070260313
  10. L. T. Manzione, J. K. Gillham, and C. A. "McPherson, Rubber-modified epoxies. II. Morphology and mechanical properties", J. Appl. Polym. Sci., 26, 907 (1981) https://doi.org/10.1002/app.1981.070260314
  11. A. J. Kinloch, S. J. Shaw, D. A. Tod, and D. L. Hunston. "Deformation and fracture behaviour of rubber-toughened epoxy: 1. Microstructure and fracture studies", Polymer, 24, 1341 (1983) https://doi.org/10.1016/0032-3861(83)90070-8
  12. A. J. Kinloch, S. J. Shaw, D. A. Tod, and D. L. Hunston. "Deformation and fracture behaviour of rubber-toughened epoxy: 2. Failure criteria", Polymer, 24, 1355 (1983) https://doi.org/10.1016/0032-3861(83)90071-X
  13. S. J. Park, "Interfacial Forces and Fields: Theory and Applications", ed. by J. p. Hsu, P. 385, Marcel Dekker, New York, 1999
  14. P. Bartlet, J. P. Pascault, and H. Sautereau, "Relationships between structure and mechanical properties of rubber modified epoxy networks cure with dicyanodiamide hardner". J. Appl. Polym. Sci., 30, 2955 (1985) https://doi.org/10.1002/app.1985.070300719
  15. Alan C. Meeks, "Fracture and mechanical properties of epoxy resins and rubber-modified epoxy resins", Polymer, 15, 675 (1974) https://doi.org/10.1016/0032-3861(74)90060-3
  16. A W. Adamson, "Physical Chemistry of Surfaces", 5edited by A.W.Adamson, John wiley, New York, 1990
  17. C. W. Wise, W. D. Cook, and A. A. Goodwin. "CTBN rubber phase precipitation in model epoxy resins" Polymer, 41. 4625 (2000) https://doi.org/10.1016/S0032-3861(99)00686-2
  18. Raja Thomas, Sebastien Durix, Christophe Sinturel, Tolib Omonov, sara Goossens, Gabriel Groeninckx, paula Moldenears, Sabu Thomas, Polymer, 48, 1965 (2007)
  19. K. Dinakaran, M. Alagar, R and Suresh Kumar, "Preparation and characterization of bismaleimide/ 1,3-dicyanatobenzene modified epoxy intercrosslinked matrices", J. Euro. Polym., 39, 2225 (2003) https://doi.org/10.1016/S0014-3057(03)00151-4
  20. S. J. Park, in "Interfacial Forces and Field Theory and Applications", edited by J. P. Hsu, Marcel Dekker, New York, 1999
  21. J. N. Israelachvili, "Intermolecular and Surface Forces", Academic Press, edited by J. N. Israelachvili, San Diego, 1962
  22. F. M. Fowkes, D. C. McCarthy, and M. A. Mostafa, "Contact angles and the equilibrium spreading pressures of liquids on hydrophobic solids", J. Colloid Interf. Sci., 78, 200 (1980) https://doi.org/10.1016/0021-9797(80)90508-1
  23. D. K. Owens and R. C. Wendnt, "Estimation of the surface free energy of polymers", J. Appl. Polym. Sci., 13, 741 (1969)
  24. S. Wu, "Polymer Interface and adhesion", edited by S. Wu, Marcel Dekker, New York, 1982
  25. S. J. Park, M. K. Seo, and H. B. Shim, "Effect of fiber shapes on physical characteristics of non-circular carbon fibers-reinforced composites", Mater. Sci. Eng. A, 352, 34 (2003) https://doi.org/10.1016/S0921-5093(02)00463-X
  26. E. K. Lee, S. Y. Choi, and S. J. Park. "Stablization of chlorosulfonated polyethylene (CSM) Rubber Emulsion with surfactant mixture", Elastomer, 36, 246 (2001)
  27. Shyue-Tzoo Lin, Steve K. Huang, "Synthesis and impact properties of siloxane-DGEBA epoxy copolymers", J. Polym. Sci.: Polym. Chem., 34, 1907 (1996) https://doi.org/10.1002/(SICI)1099-0518(19960730)34:10<1907::AID-POLA8>3.0.CO;2-L
  28. Rolf E. Humel, "Understanding materials science", edited by C.G. Joe, O. Lee, D. S. Seo, springer, 2001
  29. R. Bagheri, R.A. Pearson, "Role of particle cavitation in rubber-toughened epoxies: II. Inter-particle distance", Polymer, 41, 269 (2000) https://doi.org/10.1016/S0032-3861(99)00126-3
  30. N. Chiki, S. Fellahi, M. Baker, "Modification of epoxy resin using reactive liquid (ATBN) rubber", Eur. Polym. J., 38, 251 (2002) https://doi.org/10.1016/S0014-3057(01)00194-X
  31. Ochi M, Bell JP, "Rubber-modified epoxy resins coating high funtionality acrylic elastomers", J. Appl. Polym. Sci., 29, 1381 (1984) https://doi.org/10.1002/app.1984.070290431
  32. D. Ratna, "Phase separation in liquid rubber modified epoxy mixture. Relationship between curing conditions, morphology and ultimate behavior", Polymer, 42, 4209 (2001) https://doi.org/10.1016/S0032-3861(00)00798-9