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Int. J. Electroactive Mater. 4 (2016) 39-43

Mechanical and Electrical Properties of TiO2 Loaded Vulcanized Natural Rubber

M.A. Sulaiman1*, W. Panwiriyarat2, B.L.C. Jie3, M.N. Masri4, M. Yusoff4

1Advanced Materials Research Cluster,Faculty Earth Science, Universiti Malaysia Kelantan, Jeli, Kelantan, Malaysia
2Faculty of Science and Industrial Technology, Price Songkla University, Surat Thani Campus, Surat Thani, 84000, Thailand
3Advanced Materials Research Cluster, Faculty of Eartch Science, Universiti Malaysia Kelantan, Jeli, Kelantan, Malaysia
4Advanced Materials Research Cluster, Faculty of Earth Science, Universiti Malaysia Kelantan, Jeli, Kelantan, Malaysia

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Abstract : High dielectric constant material is very important to miniaturize many electronic devices. TiO based ceramics are well-known materials due to the very high dielectric constant at room temperature and nearly independence within wide frequency range. However, forming process for the ceramic into the desired shape requires pressing and sintering and these will limit the control for the complex shapes. To overcome this problem, it is very useful to produce composite from TiO2 powder with polymer. Among the polymer class material, elastomer type such as Vulcanized Natural Rubber (VNR) indicates very high flexibility and robust. Processing of TiO2/VNR composite involved vulcanization of rubber and followed by compounding with TiO2 (0, 5, 10, 20, 30 and 50 phr) in an internal mixer. Small blocks of composites were produced after compression using moulding machines and characterized for mechanical, microstructural and electrical properties. Mechanical testing of the composites indicates that high TiO2 content causes tensile strength starts to increase. Impedance spectroscopy measurement also shows that the increasing of TiO2 content can improve dielectric constant from 3.1513 to 3.4935 at 175 kHz and dielectric loss is decreasing from 0.0323 to 0.0252 at 1.2775 MHz. Microstructure of the composite was observed, and crystal of TiO2 immersed in the VNR with good surface contact.vulcanization of rubber and followed by compounding with TiO2 (0, 5, 10, 20, 30 and 50 phr) in internal mixer. Small blocks of composites were produced after compression using moulding machines and characterized for mechanical, microstructural and electrical properties. Tensile results of the composites indicate that high TiO2 content causes tensile strength starts to increase. Impedance spectroscopy measurements also shows that the increasing of TiO2 content can improve dielectric constant from 3.1513 to 3.4935 at 175 kHz and dielectric loss is decreasing from 0.0323 to 0.0252 at 1.2775 MHz. Microstructure of the composite was observed and crystal of TiO2 immersed in the VNR with good surface contact.

Keywords : dielectric material,rubber/ceramic composite,vulcanized natural rubber