Elastomers and Composites

The Rubber Society of Korea (한국고무학회)
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Effects of Inorganic Fillers on Mechanical Properties of Silicone Rubber

  • Kim, Gyu Tae (Department of Chemical Engineering, Keimyung University) ;
  • Lee, Young Seok (Jinyang Oilseal Co., Ltd.) ;
  • Ha, KiRyong (Department of Chemical Engineering, Keimyung University)
  • Received : 2019.05.21
  • Accepted : 2019.06.04
  • Published : 2019.06.30
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Abstract

In this study, the effects of filler particle size and shape on the physical properties of silicone rubber composites were investigated using inorganic fillers (Minusil 5, Celite 219, and Nyad 400) except silica, which was already present as a reinforcing filler of silicone rubber. Fillers with small particle sizes are known to facilitate the formation of the bound rubber by increasing the contact area with the polymer. However, in this experiment, the bound rubber content of Celite 219-added silicone composite was higher than that of Minusil 5-added silicone composite. This was attributed to the porous structure of Celite 219, which led to an increase in the internal surface area of the filler. When the inorganic fillers were added, both thermal decomposition temperature and thermal stability were improved. The bound rubber formed between the silicone rubber and inorganic filler affected the degree of crosslinking of the silicone composite. It is well-known that as the size of the reinforcing filler decreases, the reinforcing effect increases. However, in this experiment, the hardness of the composite material filled with Celite 219 was the highest compared to the other three composites. Furthermore, the highest value of 2.19 MPa was observed for 100% modulus, and the fracture elongation was the lowest at 469%. This was a result of excellent interaction between Celite 219 filler and silicone rubber.

Keywords

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Figure 1. Chemical structure of silicone rubber used in this study.(n + m = 5,000, m = 0~400).

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Figure 2. Contents of bound rubber for the silicone compound with different inorganic fillers.

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Figure 3. FTIR-ATR spectra of the silicone compound with different inorganic fillers.

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Figure 4. Rheo-curves for the silicone compound with different inorganic fillers.

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Figure 5. Mechanical properties of silicone compound (a) Shore A hardness, (b) 100% modulus, (c) elongation at break, and (d) tensile strength.

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Figure 6. TGA thermograms of the silicone compounds with different inorganic fillers.

Table 1. Formulation of Silicone Compounds

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Table 2. Curing Characteristics of Silicone Compounds

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References

  1. S. H. Jin, J. H. Hong, I. Kim, J. H. Yon, and S. E. Shin, "Effect of Vinyltriethoxysilane Content on Mechanical and Physical Properties of Precipitated Silica Reinforced Silicone Rubber", Polymer(Korea), 35, 342 (2011).
  2. S. Lee and J. S. Song, "Silicone Rubbers in Medical Engineering for Rehabilitation", Elast. Compos., 44, 2 (2009).
  3. J. W. Hwang, "실리콘 고무의 특성과 응용", Rubber Technology, 8, 108 (2007).
  4. J. K. Kim, "Elastomeric High Barrier Materials for Vehicle", Elast. Compos., 46, 2 (2011).
  5. L. S. Ill, "A Study on the Dielectronic Properties of Silicone Rubber Filled with Silica", J. KIEEME, 26, 810 (2013).
  6. H. K. Choi and T. S. Yoon, "Trends and Prospective of Silicon Industry", Prospective of Industrial Chemistry, 2, 41 (1999).
  7. S. I. Lee, "A Study on Electrostatic Degradation Properties of Silicone Rubber due to Reinforcing Agent", J. KIEEME, 28, 120 (2015).
  8. S. K. Kang and K. H. Chung, "Effect of Filler on the Physical Properties of Silicone Rubber Impression Material", Elastomer, 41, 157 (2006).
  9. D. W. Kang, K. S. Lee, and H. G. Yeo, "Preparation and Characteristics of Liquid Silicone Rubber Nanocomposite", J. Korean Ind. Eng. Chem., 14, 569 (2003).
  10. J. K. Kim, "Silicone Elastomer", Rubber Technology, 19, 94 (2018).
  11. C. H. Lim, M. K. Kim, Y. C. Kim, N. C. Park, H. J. Song, and Y. J. Park, "Effects of Silicone Polymer Blends on Physical Properties of Dental Polyvinylsiloxane Impression Materials", Elast. Compos., 44, 76 (2009).
  12. L. S. Ill, "Estimation of Electric Properties of Insulation Silicon Rubbers Added Reinforcing Fillers", Journal of the Korea Institute of Rubber Industry, 32, 309 (1997).
  13. H. J. Ryu, S. Hwang, Y. Kim, S. H. Jin, S. H. Back, and S. E. Shim, "Comparison of Properties of Silicon Rubber Containing Particulate and Fibrous Fire-Proofing Fillers", Polymer(Korea), 41, 935 (2017). https://doi.org/10.7317/pk.2017.41.6.935
  14. E. S. Kim, E. J. Kim, T. H. Lee, and J. S. Yoon, "Physical Properties of Silicone Rubber/clay Composites According to the Clay Type and Modification", Elast. Compos., 44, 260 (2009).
  15. S. Hwang, H. J. Ryu, Y. Kim, J. I. So, S. H. Jin, S. H. Back, and S. E. Shim, "Thermal Stability and Mechanical Properties of Silicone Rubber Composites Filled With Inorganic Fireproof Fillers and Expandable Materials", Polymer(Korea), 42, 354 (2018). https://doi.org/10.7317/pk.2018.42.3.354
  16. J. Kim and D. F. Lawler, "Characteristics of Zeta Potential Distribution in Silica Particles", Bull. Korean Chem. Soc., 26, 1083 (2005). https://doi.org/10.5012/bkcs.2005.26.7.1083
  17. Y. C. Chung, B. C. Chun, S. D. Lee, and J. S. Park, "CeliteMediated Linking of Polyurethane Black Copolymers and the Impact on the Shape Memory Effect", Journal of Applied Polymer Science, 115, 3568 (2010). https://doi.org/10.1002/app.30884
  18. K. H. Seo, K. S. Cho, I. S. Yun, W. H. Choi, B. K. Hur, and D. G. Kang, "The Effect of Fillers on Rubber Characteristics for Gasket to Lithium Ion Battery", Polymer(Korea), 34, 430 (2010).
  19. G. Seo, D. I. Kim, S. J. Kim, C. Ryu, J. K. Yang, and Y. G. Kang, "Reinforcement of Rubber Properties by Carbon Black and Silica Fillers: A Review", Elast. Compos., 52, 114 (2017). https://doi.org/10.7473/EC.2017.52.2.114
  20. S. Music, N. Filipovic-Vincekovic, and L. Sekovanic, "Precipitation of Amorphous $SiO_2$ Particles and Their Properties", Brazilian Journal of Chemical Engineering, 28, 89 (2011). https://doi.org/10.1590/S0104-66322011000100011
  21. https://www.brenntag.com/media/documents/bsi/product_-data_sheets/material_science/us_silica/ground_silica_pds.pdf.
  22. https://imerys-filtration.com/north-america/wp-content/uploads/site/10/2019/04/FF622_Celite-Functional-Filler-Grades_Apr2016.pdf.
  23. http://www.imerys-additivesformetallurgy.com/wp-content/uploads/Wollastonite-NYAD-400-technical-data-sheet.pdf.
  24. Y. B. Hwang, W. K. Lee, and C. Y. Park, "Mechanical Property, Thermal Conductivity, Resilience and Thermal Property of Chloro Isobutylene Isoprene Rubber/Ethylene Propylene Diene Monomer Blend", Elast. Compos., 53, 80 (2018). https://doi.org/10.7473/EC.2018.53.2.80
  25. B. Lee, J. Lee, D. Bang, J. Won, I. Jang, W. Park, and K. H. Jhee, "A Study on Improvement of Fire-resistant and Flame-retardant Properties of Silicone Rubber Composites Containing Perlite", Elast. Compos., 46, 164 (2011).