Thermal and Mechanical Properties of Ethyl Vinyl Acetate (EVA) / Nano-Clays or Slaked Lime Composites

Öz

Ethyl vinyl acetate (EVA) is a widely used copolymer in various industrial applications. One concern about its utilization is its flammability as other polymeric materials. The inorganic fillers like clays, metal hydroxides (e.g. of Al, Mg), metal oxides (e.g. alumina) are evaluated as environmentally benign additives to enhance the flammability characteristics of the polymers. The composites prepared via these inorganic fillers should also be characterized by considering their required mechanical properties for specific applications. The possible utilization of different nano-clays (organically surface modified montmorillonite (MMT)) and “slaked lime” (Ca(OH)2 without surface modification) was investigated in the current study. The nano-clay with exfoliated morphology in the EVA matrix was found to be more effective on both mechanical and flammability characteristics of EVA composites. Ca(OH)2 was also moderately effective on mechanical and thermal characteristics of the EVA composite. The inorganic filler content of EVA composites may be increased for better flame-retardancy, but the mechanical properties should be investigated simultaneously.

Anahtar Kelimeler

• EVA
• Flame-retardancy
• Nano-clay
• Slaked lime
• Mechanical properties

Kaynakça

1. Aghjeh MR, Nazari M, Khonakdar HA, Jafari SH, Wagenknecht U, Heinrich G. 2015. In depth analysis of micro-mechanism of mechanical property alternations in PLA/EVA/clay nanocomposites: A combined theoretical and experimental approach. Mater Des, 88: 1277-1289.
2. Akpomie KG, Dawodu FA. 2016. Acid-modified montmorillonite for sorption of heavy metals from automobile effluent. Beni-Suef Uni J Basic App Sci, 5: 1-12.
3. Bartolomei SS, Santana JG, Valenzuela Díaz FR, Kavaklı PA, Guven O, Moura EAB. 2020. Investigation of the effect of titanium dioxide and clay grafted with glycidyl methacrylate by gamma radiation on the properties of EVA flexible films. Radiat Phys Chem, 169: 107973.
4. Beyer G. 2009. Nanocomposites - a new class of flame retardants. Plastics Addit Compounding, 11(2): 16-21.
5. Chaudhary DS, Prasad R, Gupta RK, Bhattacharya SN. 2005. Clay intercalation and influence on crystallinity of EVA-based clay nanocomposites. Thermochim Acta, 433(1-2): 187-195.
6. Chuayjuljit S, Worawas C. 2011. Nanocomposites of EVA/polystyrene nanoparticles/montmorillonite. J Compos Mater, 45(6): 631-638.
7. Das P, Manna S, Behera AK, Shee M, Basak P, Sharma AK. 2022. Current synthesis and characterization techniques for clay-based polymer nano-composites and its biomedical applications: A review. Environ Res, 212: 113534.
8. Díez E, Rodríguez A, Gómez JM, Galán J. 2021. TG and DSC as tools to analyse the thermal behaviour of EVA copolymers. J Elastomers Plast, 53(7): 792-805.

9. Dinçer Fil S, Alp FB, Gönen M. 2025. Techno-economic analysis of zinc borate production from zinc oxide and boric acid. J Black Sea Eng Sci, 8(1): 119-127.
10. Dogan M, Dogan SD, Savas LA, Ozcelik G, Tayfun U. 2021. Flame retardant effect of boron compounds in polymeric materials. Compos B Eng, 222: 109088.
11. Feng Y, Li X, Wu H, Li C, Zhang M, Yang H. 2023. Critical review of Ca(OH)2/CaO thermochemical energy storage materials. Energies Basel, 16(7): 3019.
12. Guo F, Aryana S, Han Y, Jiao Y. 2018. A review of the synthesis and applications of polymer-nanoclay composites. Appl Sci Basel, 8(9): 1696.
13. Gupta A, Armatis PD, Sabharwall P, Fronk BM, Utgikar V. 2021. Thermodynamics of Ca(OH)2/CaO reversible reaction: Refinement of reaction equilibrium and implications for operation of chemical heat pump. Chem Eng Sci, 230: 116227.
14. Harish Kumar P, Soni A, Chakinala AG, Singhal R, Joshi RP, Mukhopadhyay AK. 2022. Effect of molarity on methylene blue dye removal efficacy of nano Ca(OH)2. ChemistrySelect, 7: e202200393.
15. He W, Song P, Yu B, Fang Z, Wang H. 2020. Flame retardant polymeric nanocomposites through the combination of nanomaterials and conventional flame retardants. Prog Mater Sci, 114: 100687.
16. Jeong SH, Park CH, Song H, Heo JH, Lee JH. 2022. Biomolecules as green flame retardants: Recent progress, challenges, and opportunities. J Clean Prod, 368: 133241.
17. Luna CBB, da Silva Barbosa Ferreira E, Siqueira DD, dos Santos Filho EA, Araújo EM. 2022. Additivation of the ethylene-vinyl acetate copolymer (EVA) with maleic anhydride (MA) and dicumyl peroxide (DCP): the impact of styrene monomer on cross-linking and functionalization. Polym Bull, 79(9): 7323-7346.
18. Mirghiasi Z, Bakhtiari F, Darezereshki E, Esmaeilzadeh E. 2014. Preparation and characterization of CaO nanoparticles from Ca(OH)2 by direct thermal decomposition method. J Ind Eng Chem, 20(1): 113-117.
19. Nyambo C, Kandare E, Wilkie CA. 2009. Thermal stability and flammability characteristics of ethylene vinyl acetate (EVA) composites blended with a phenyl phosphonate-intercalated layered double hydroxide (LDH), melamine polyphosphate and/or boric acid. Polym Degrad Stab, 94(4): 513-520.
20. Oualha MA, Amdouni N, Laoutid F. 2017. Synergistic flame-retardant effect between calcium hydroxide and zinc borate in ethylene-vinyl acetate copolymer (EVA). Polym Degrad Stab, 144: 315-324.
21. Rafiee R, Shahzadi R. 2019. Mechanical properties of nanoclay and nanoclay reinforced polymers: A review. Polym Compos, 40(2): 431-445.
22. Rajczak E, Arrigo R, Malucelli G. 2020. Thermal stability and flame retardance of EVA containing DNA-modified clays. Thermochim Acta, 686: 178546.
23. Ryu HJ, Hang NT, Lee JH, Choi JY, Choi G, Choy JH. 2020. Effect of organo-smectite clays on the mechanical properties and thermal stability of EVA nanocomposites. Appl Clay Sci, 196: 105750.
24. Shinde SG, Shrivastava VS. 2020. Ni and Zn modified acid activated montmorillonite clay for effective removal of carbol fuchsin dye from aqueous solution. SN Appl Sci, 2: 519.
25. Tambe SP, Naik RS, Singh SK, Patri M, Kumar D. 2009. Studies on effect of nanoclay on the properties of thermally sprayable EVA and EVAI coatings. Prog Org Coat, 65(4): 484-489.
26. Xu YJ, Qu LY, Liu Y, Zhu P. 2021. An overview of alginates as flame-retardant materials: Pyrolysis behaviors, flame retardancy, and applications. Carbohydr Polym, 260: 117827.
27. Ye L, Miao Y, Yan H, Li Z, Zhou Y, Liu J, Liu H. 2013. The synergistic effects of boroxo siloxanes with magnesium hydroxide in halogen-free flame retardant EVA/MH blends. Polym Degrad Stab, 98(4): 868-874.
28. Zhang H, Wang W, Li L, Liu J. 2018. Starch-assisted synthesis and characterization of layered calcium hydroxide particles. J Inorg Organometal Poly Mat, 28: 2399-2406.
29. Zhang X, Yi H, Bai H, Zhao Y, Min F, Song S. 2017. Correlation of montmorillonite exfoliation with interlayer cations in the preparation of two-dimensional nanosheets. RSC Adv, 7(66): 41471-41478.
30. Zheng M, Sun SM, Hu J, Zhao Y, Yu LJ. 2015. Preparation of nano-composite Ca2-αZnα(OH)4 with high thermal storage capacity and improved recovery of stored heat energy. Open Eng, 5(1): 42-47.