Effect of Cell Morphology on Energy Absorption of Nitrile Rubber Foam

Document Type : Research Paper

Authors

1 Faculty of Materials and Manufacturing Technologies, Malek Ashtar University of Technology, P.O.Box 15875-1774,Tehran, Iran

2 Faculty of Materials and Manufacturing Technologies, Malek Ashtar University of Technology, P.O.Box 15875-1774, Iran

Abstract

Hypothesis: High energy absorption capacity of rubber foam, during the large compression deformations of cell structure, is an important variable that is considered by engineers as a design criterion. In this respect, the energy absorption behavior of acrylonitrile butadiene rubber (NBR) foam with different densities was studied by efficiency and acutest parameters.
Methods: The closed cell NBR foams with densities of 0.51, 0.63, 0.72 and 0.79 g/cm3 were prepared by changing the amount of compound in the equal volume of the mold. The cell morphology and compressive properties of the foams were analyzed by scanning electron microscopy (SEM) and compression tests, respectively.
Findings: The cell morphology analysis has indicated that by decreasing the foam density, the average cell diameter becomes larger, the number of cells per unit volume decreases and the cell size distribution becomes heterogeneous. In the compression test, by decreasing density from 0.79 to 0.51 g/cm3, the plateau stress decreases from 750 to 246 kPa and the corresponding stress with the maximum efficiency decreases from 1.13 to 0.27 MPa. In the low stress range, 0.3 MPa, by decreasing density from 0.79 to 0.51 g/cm3, the energy absorption of foam changes from 0.39 to 0.009 MJ/m3. As a result, in the low stress range, lower density foams show more energy absorption. While in the high stress range, higher density foams absorb more energy. For example, in the 1.3 MPa stress, the energy absorption of foams with the density 0.51 g/cm3 and 0.79 g/cm3 is about 0.88 MJ/m3 and 0.1 MJ/m3, respectively. Therefore, the energy absorption capacity of the foam depends on the density and stress range, which determines the maximum allowable stress of the foam based on its density.

Keywords

References

  1. Ameli A., Nofar M., Park C.B., Pötschke P., and Rizvi G., Polypropylene/Carbon Nanotube Nano/Microcellular Structures with High Dielectric Permittivity, Low Dielectric Loss, and Low Percolation Threshold, Carbon N.Y., 71, 206-217, 2014.
  2. Ameli A., Nofar M., Wang S., and Park C.B., Lightweight Polypropylene/Stainless-Steel Fiber Composite Foams with Low Percolation for Efficient Electromagnetic Interference Shielding, ACS Appl. Mater. Interfaces, 6, 11091-11100, 2014.
  3. Albooyeh A. and Ghasemi I., Effect of Mesoporous Silica and Hydroxyapatite Nanoparticles on the Tensile and Dynamic Mechanical Thermal Properties of Polypropylene and Polypropylene Foam, Iran. J. Polym. Sci. Technol. (Persian), 27, 423-439, 2014.
  4. Nofar M., Ameli A., and Park C.B., A Novel Technology to Manufacture Biodegradable Polylactide Bead Foam Products, Mater. Des., 83, 413-421, 2015.
  5. Zhang J. and Ashby M.F., Mechanical Selection of Foams and Honeycombs Used for Packaging and Energy Absorption, J. Mater. Sci., 29, 157-163, 1994.
  6. Kim D.Y., Kim G.H., Nam G.M., Kang D.G., and Seo K.H., Oil Resistance and Low-Temperature Characteristics of Plasticized Nitrile Butadiene Rubber Compounds, J. Appl. Polym. Sci., 136, 47851, 2019.
  7. Drane P., De Jesus-Vega M., Inalpolat M., Sherwood J., and Orbey N., Inductive quantification of Energy Absorption of High-Density Polyethylene Foam for Repeated Blunt Impact, Proc. Inst. Mech. Eng. Part L: J. Mater. Des. Appl., 234, 531–545, 2020.
  8. Mahapatra S.P. and Tripathy D.K., Dynamic Mechanical Properties of Conductive Carbon Black-Reinforced Closed Cell Microcellular Oil-Extended EPDM Rubber Vulcanizates: Effect of Blowing Agent, Temperature, Frequency, and Strain, J. Appl. Polym. Sci., 102, 1600–1608, 2006.
  9. Najib N.N., Ariff Z.M., Bakar A.A., and Sipaut C.S., Correlation between the Acoustic and dynamic Mechanical Properties of Natural Rubber Foam: Effect of Foaming Temperature, Mater. Des., 32, 505–511, 2011.
  10. Saha M.C., Mahfuz H., Chakravarty U.K., Uddin M., Kabir M.E., and Jeelani S., Effect of Density, Microstructure, and Strain Rate on Compression Behavior of Polymeric Foams, Mater. Sci. Eng. A, 406, 328–336, 2005.
  11. Esmizadeh E., Vahidifar A., Rostami E., Nouri Khorasani S., Ghayoumi M., and Khonakdar H.A., Effect of Carbon Black on Morphological and Mechanical Properties of Rubber Foams Produced by a Single-step Method, J. Appl. Res. Chem. Eng., 1, 49–60, 2017.
  12. Najib N.N., Ariff Z.M., Manan N.A., Bakar A.A., and Sipaut C.S., Effect of Blowing Agent Concentration on Cell Morphology and Impact Properties of Natural Rubber Foam, J. Phys. Sci., 20, 13-25, 2009.
  13. Wang B., Peng Z., Zhang Y., and Zhang Y., Compressive Response and Energy Absorption of Foam EPDM, J. Appl. Polym. Sci., 105, 3462-3469, 2007.
  14. Samsudin M.S.F., Ariff Z.M., and Ariffin A., Deformation Behavior of Open-Cell dry Natural Rubber Foam: Effect of Different Concentration of Blowing Agent and Compression Strain Rate, AIP Conference Proceedings, 2017.
  15. El Eraki M.H., El Lawindy A.M.Y., Hassan H.H., and Mahmoud W.E., The Physical Properties of Pressure Sensitive Rubber Composites, Polym. Degrad. Stab., 91, 1417-1423, 2006.
  16. Mahmoud W.E., El-Eraki M.H.I., El-Lawindy A.M.Y., and Hassan H.H., A Novel Application of ADC/K-Foaming Agent-loaded NBR Rubber Composites as Pressure Sensor, J. Phys. D: Appl. Phys., 39, 541-546, 2006.
  17. Wang B., Peng Z., Zhang Y., and Zhang Y., Rheological Properties and Foam Processibility of Precured EPDM, J. Appl. Polym. Sci., 101, 3387-3394, 2006.
  18. Sombatsompop N. and Lertkamolsin P., Effects of Chemical Blowing Agents on Swelling Properties of Expanded Elastomers, J. Elast. Plast., 32, 311-328, 2000.
  19. Brennan-Craddock J.P.J., Bingham G.A., Hague R.J.M., and Wildman R.D., Impact Absorbent Rapid Manufactured Structures (IARMS), International Solid Freeform Fabrication Symposium, 2008.
  20. Gibson L.J. and Ashby M.F., Cellular Solids: Structure and Properties, Cambridge University, 1999.
  21. Li Q.M., Magkiriadis I., and Harrigan J.J., Compressive Strain at the Onset of Densification of Cellular Solids, J. Cell. Plast., 42, 371-392, 2006.
  22. San Ha N., Lu G., Shu D., and Yu T.X., Mechanical Properties and Energy Absorption Characteristics of Tropical Fruit Durian (Durio Zibethinus), J. Mech. Behav. Biomed. Mater., 104, 103603, 2020.
  23. Teh P.L., Ishak Z.A.M., Hashim A.S., Karger-Kocsis J., and Ishiaku U.S., Effects of Epoxidized Natural Rubber as a Compatibilizer in Melt Compounded Natural Rubber-Organoclay Nanocomposites, Eur. Polym. J., 40, 2513-2521, 2004.
  24. Guriya K.C. and Tripathy D.K., Morphology and Physical Properties of Closed-Cell Microcellular Ethylene-Propylene-Diene Terpolymer (EPDM) Rubber Vulcanizates: Effect of Blowing Agent and Carbon Black Loading, J. Appl. Polym. Sci., 62, 117-127, 1996.
  25. Vahidifar A., Esmizadeh E., Rodrigue D., Khonakdar H.A., and Wagenknecht U., Towards Novel Super-Elastic Foams Based on Isoperene Rubber: Preparation and Characterization, Polym. Adv. Technol., 31, 1508-1518, 2020.
  26. Zakaria Z., Ariff Z.M., Tay L.H., and Sipaut C.S., Effect of Foaming Temperature on Morphology and Compressive Properties of Ethylene Propylene Diena Monomer Rubber (EPDM) Foam, Malaysian Polym. J., 2, 22-30, 2007.
  27. Zhang Y., Rodrigue D., and Ait-Kadi A., Polyethylene-Kevlar Composite Foams I: Morphology, Cell. Polym., 22, 279-294, 2003.
  28. Miltz J. and Ramon O., Energy Absorption Characteristics of Polymeric Foams Used as Cushioning Materials, Polym. Eng. Sci., 30, 129-133, 1990.
  29. Maiti S.K., Gibson L.J., and Ashby M.F., Deformation and Energy Absorption Diagrams for Cellular Solids, Acta Metall., 32, 1963-1975, 1984.
  30. Guriya K.C. and Tripathy D.K., Deformation and Energy-absorption Characteristics of Microcellular EPDM Rubber, J. Appl. Polym. Sci., 68, 263-269, 1998.
  31. Avalle M., Belingardi G., and Montanini R., Characterization of Polymeric Structural Foams under Compressive Impact Loading by Means of Energy-Absorption Diagram, Int. J. Impact Eng., 25, 455-472, 2001.

 

Iranian Journal of Polymer Science and Technology
Volume 33, Issue 6 - Serial Number 170
March and April 2021
Pages 497-507

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