Cure Characteristics of Foaming EVA Compounds: Influence of EVA Types and Cure Systems

  • Received : 2016.06.18
  • Accepted : 2016.09.12
  • Published : 2016.09.30


Influence of poly(ethylene-co-vinyl acetate) (EVA) types and cure systems on cure characteristics of foaming EVA compounds were investigated. Three kind EVAs with different VA contents were employed. Influence of triallyl cyanurate (TAC) and dicumylperoxide (DCP) content on the cure characteristics were examined. The minimum torque ($T_{min}$) and delta torque (${\Delta}T$) decreased as the VA content increased. The ${\Delta}T$ was increased by adding TAC and by increasing the DCP content. For the foaming EVA compounds without TAC, the cure times such as the minimum cure time ($t_{min}$), scorch time ($t_2$), and optimal cure time ($t_{90}$) did not show a specific trend according to the DCP contents. For the foaming EVA compounds containing TAC, the cure times decreased as the DCP content increased. From the experimental results, it was found that efficienct DCP/TAC ratio for improvement of the crosslink density was 1.1~2.0.


  1. G. Meszlenyi and G. Kortvelyessy, "Direct Determination of Vinyl Acetate Content of Ethylene Vinyl Acetate Copolymers in Thick Films by Infrared Spectroscopy", Polym. Test., 18, 551 (1999).
  2. I. Poljansek, E. Fadjan, K. Burja, and D. Kukanja, "Emulsion Copolymerization of Vinyl Acetate-ethylene in High Pressure Reactor-characterization by Inline FTIR Spectroscopy", Prog. Org. Coat., 76, 1798 (2013).
  3. D. Klempner and K. C. Frisch, "Handbook of Polymeric Foams and Foam Technology", Hanser, NewYork (1991).
  4. J.-T. Kim, W.-J. Son, W. Kim, and B. H. Ahn, "Foaming Characteristics and Physical Properties of Ethylene Vinyl Acetate Copolymer Foams", Elastomer, 36, 52 (2001).
  5. R. Verdejo and N. J. Mills, "Heel-shoe Interactions and the Durability of EVA Foam Running-shoe Midsoles", J. Biomech., 37, 1379 (2004).
  6. R. Verdejo and N. J. Mills, "Simulating the Effects of Long Distance Running on Shoe Midsole Foam", Polym. Test., 23, 567 (2004).
  7. K.-W. Park and G.-H. Kim, "Ethylene Vinyl Acetate Copolymer (EVA)/Multiwalled Carbon Nanotube (MWCNT) nAnocomposite Foams", J. Appl. Polym. Sci., 112, 1845 (2009).
  8. M. Maiti, R. V. Jasra, S. K. Kusum, and T. K. Chaki, "Microcellular Foam from Ethylene Vinyl Acetate/polybutadiene Rubber (EVA/BR) Based Thermoplastic Elastomers for Footwear Applications", Ind. Eng. Chem. Res., 51, 10607 (2012).
  9. M.-S. Kim, C.-C. Park, S. R. Chowdhury, and G.-H. Kim, "Physical Properties of Ethylene Vinyl Acetate Copolymer (EVA)/Natural Rubber (NR) Blend Based Foam", J. Appl. Polym. Sci., 94, 2212 (2004).
  10. O. Bianchi, R. V. B. Oliveira, R. Fiorio, J. De N. Martins, A. J. Zattera, and L. B. Canto, "Assessment of Avrami, Ozawa and Avrami-Ozawa Equations for Determination of EVA Crosslinking Kinetics from DSC Measurements", Polym. Test., 27, 722 (2008).
  11. O. Bianchi, J. De N. Martins, R. Fiorio, R. V. B. Oliveira, and L. B. Canto, "Changes in Activation Energy and Kinetic Mechanism During EVA Crosslinking", Polym. Test., 30, 616 (2011).
  12. S. K. Dutta, A. K. Bhowmick, and T. K. Chaki, "Structure Property Relationship of Ethylene Vinyl Acetate Copolymer Grafted with Triallyl Cyanurate by Electron Beam Radiation", Radiat. Phys. Chem., 47, 913 (1996).
  13. S. K. Datta, T. K. Chaki, and A. K. Bhowmick, "Electron Beam Initiated Grafting and Crosslinking of Ethylene Vinyl Acetate Copolymer. Part-I: Structural Characterization", Rubber Chem. Technol., 69, 120 (1996).