Effect of Ethylene Vinyl Axetate (EVA) on the Mechanical Properties of Low-Density Polyethylene/EVA Blends

Abstract:

The extensive range of fillers used nowadays indicated the major significance of filler in the plastic industry. Although their original purpose was to lower the cost of the molding compounds; prime importance is now attached to selective modification of the properties of a specific plastic. In this study, the examples of LDPE/EVA blends, were put into 0, 3, 6, 9, 12 and 15 wt.% of EVA. The tensile strength, bending strength and impact strength of samples were determined according to ASTM D638, ISO 178 and ISO 179. Results showed that when increasing ratio of EVA in LDPE/ EVA blends, tensile strength decreased from 10.9 MPa to 8.6 MPa. Bending strength decreased linearly from 9.63 MPa to 5.46 MPa. Charpy impact strength decreased from 47.5 kJ/m² to 6.3 kJ/m². On the contrary, elongation in 100% LDPE is 78.3%; with the appearance of EVA, elongation of the LDPE/ EVA blends increased upto 109.1%. In addition, SEM micrographs indicated that, it was more crystal-clear when the EVA content is less; in the highest EVA content with 15%, it can be seen that the specimen after pressing is slightly opaque and darker than the orthers. From that showed the addition of EVA to the polymer leads the tensile strength, bending strength were not affect much, impact strength decreased but elongation experienced an increase.

• Periodical: Applied Mechanics and Materials (Volume 889)
• Pages: 223-230
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.889.223
• Online since: March 2019
• Authors: Thi Hong Nga Pham, Thi My Hoa Le, Xiao Wei Zhang
• Keywords: Blend, Elongation, Ethylene Vinyl Acetate, LDPE/ EVA, Tensile Strength

References

[1] Yang Chen, Investigations of Environmental Stress Cracking Resistance of HDPE/EVA and LDPE/EVA Blends, Wiley Periodicals, Inc. J. Appl. Polym. Sci., 131 (2014) 3988.

DOI: 10.1002/app.39880

[2] G. Takidis, D. N. Bikiaris, G. Z. Papageorgiou, at al. Compatibility of Low-Density Polyethylene/Poly (ethyleneco-vinyl acetate) Binary Blends Prepared by Melt Mixing, Journal of Applied Polymer Science, 90 (2003) 841-852.

DOI: 10.1002/app.12663

[3] A. Noori, F. Ziaie, The Infuence of morphology on the electrical properties of 10MeV electron beam irradiated polyethylene/ethylene-vinyl-acetate blend (PE/EVA), Journal of Applied Chemical Research, 14 (2010) 37-44.

[4] I. Ray, D. Khastgir, Correlation between morphology with dynamic mechanical, thermal, physic, mechanical properties and electrical conductivity for EVA-LDPE blends, Polymer, 34 (10), (1993) 2030-2037.

DOI: 10.1016/0032-3861(93)90727-r

[5] H. Azizi, J. Barzin, J. Morshedian, Silane crosslinking of polyethylene: the effects of EVA, ATH and Sb2O3 on properties of the production in continuous grafting of LDPE, EXPRESS Polymer Letters, 1, No.6 (2007) 378-384.

DOI: 10.3144/expresspolymlett.2007.53

[6] Bistra Borisova, Jo¨rg Kressler, Environmental Stress-Cracking Resistance of LDPE/EVA Blends, Macromol. Mater. Eng. 288 (2003) 509-515.

DOI: 10.1002/mame.200390048

[7] S. M. A. Salehi, G. Mirjalili, J. Amrollahi, Effects of High-Energy Electron Beam on Low-Density Polyethylene Materials Containing EVA, Journal of Applied Polymer Science, 92 (2004) 1049-1052.

DOI: 10.1002/app.20079

[8] M. A. Rodri´guez-pe´rez, A. Duijsens, j. A. De Saja, Effect of Addition of EVA on the Technical Properties of Extruded Foam Profiles of Low-Density Polyethylene/EVA Blends, Journal of Applied Polymer Science, 68 (1998) 1237-1244.

DOI: 10.1002/(sici)1097-4628(19980523)68:8<1237::aid-app5>3.0.co;2-e

[9] Siqin Dalai, Chen Wenxju, An Investigation on Radiation Crosslinked Foam of LDPE/EVA Blends, JAERI-Conf, 03 (1995).