Analysis of Poly(Ethylene-co-Vinyl Acetate) Using Off-line Pyrolysis

  • Received : 2016.01.05
  • Accepted : 2016.01.13
  • Published : 2016.03.31


Poly(ethylene-co-vinyl acetate) (EVA) was pyrolyzed to eliminate acetic acid of VA unit using off-line pyrolysis, and the deacetylated EVA was analyzed infrared spectroscopy (IR) and pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS). EVA film for deacetylation was prepared by solution casting on aluminum foil and it was pyrolyzed at low temperature of $300^{\circ}C$ in the off-line pyrolysis apparatus. After deacetylation, carbon-carbon double bond (C=C) was formed by 1,2-elimination of the VA unit in the EVA backbone. Most of C=C bonds were trans-1,4-unit and 1,2-unit was also observed. Presence of the 1,2-unit in deacetylated EVA indicates that terminal or branch VA units exist in the raw EVA. Py-GC/MS chromatogram of deacetylated EVA displayed much smaller acetic acid and much more abundant other pyrolysis products than that of raw EVA, which means that the pyrolysis efficiency and separation condition were improved.


  1. "Standard test method for determination of the vinyl acetate content of ethylene-vinyl acetate (EVA) copolymers by Fourier transform infrared spectroscopy (FT-IR)", ASTM D5594-98 (2012).
  2. E. Kim and S.-S. Choi, "Comparison of vinyl acetate contents of poly(ethylene-co-vinyl acetate) analyzed by IR, NMR, and TGA", Elast. Compos., 50, 18 (2015).
  3. R. J. Koopmans, R. van der Linden, and E. F. Vansnat, "The characterisation of newly developed and promising hydrolyzed ethylene vinyl acetate copolymers", J. Adhes., 11, 191 (1980).
  4. 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).
  5. 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).
  6. Z. Wenwei, Z. Xiaoguang, Y. Li, Z. Yuefang, and S. Jiazhen, "Determination of the vinyl acetate content in ethylene-vinyl acetate copolymers by thermogravimetric analysis", Polymer, 35, 3348 (1994).
  7. B. J. McGrattan, "Examining the decomposition of ethylene-vinyl acetate copolymers using TG/GC/IR", Appl. Spectrosc., 48, 1472 (1994).
  8. A. Marcilla, A. Gomez, and S. Menargues, "TG/FTIR study of the thermal pyrolysis of EVA copolymers", J. Anal. Appl. Pyrolysis, 74, 224 (2005).
  9. N. S. Allen, M. Edge, M. Rodriguez, C. M. Liauw, and E. Fontan, "Aspects of the thermal oxidation of ethylene vinyl acetate copolymer", Polym. Degrad. Stab., 68, 363 (2000).
  10. ISO 21561:2005, "Styrene-butadiene rubber (SBR) -- Determination of the microstructure of solution-polymerized SBR".
  11. S.-S. Choi, Y. Kim, and H.-M. Kwon, "Microstructural analysis and cis-trans isomerization of BR and SBR vulcanizates reinforced with silica and carbon black using NMR and IR", RSC Adv., 4, 31113 (2014).
  12. E. Kim and S.-S. Choi, "Photooxidation of BR vulcanizate using high pressure mercury lamp", Elast. Compos., 50, 1 (2015).