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Dielectric and Mechanical Properties of Silicone Rubber Composites Reinforced by Conductive Carbon Black and Neopentyl Glycol Diglycidyl Ether

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Abstract

In the present investigation, dielectric, tensile strength, fracture toughness, and stress-strain properties of silicone rubber (SR) dispersed with carbon black (CB), and neopentyl glycol diglycidyl ether (NPGDE) (5 wt%, 10 wt%, and 12 wt%) were studied. Flake-like agglomerated morphology was confirmed from SEM (scanning electron microscope) studies as the CB@NPDGE filler concentration increases in the SR matrix. Surface area (354–358/cm3/g/A), pore size, and pore diameter (2.89 nm) remarkably increased for SR: CB@NPDGE polymer composites when compared with virgin SR. TGA spectra showed an increase in the decomposition temperature (600 °C) for SR: CB/NPDGE polymer composite when compared with virgin SR. A slight shift in the wavenumber of the functional groups resulted as the CB@NPDGE concentration increases in the SR polymer matrix. Optical absorbance shift towards the right side of the spectrum (redshift), broadened as CB@NPDGE concentration increased in SR polymer and optical band gap (Eg) decreases from 3.50 eV to 2.64 eV. SR:CB@NPDGE (10 wt% and 12 wt%) displayed improved dielectric properties having dielectric constant (1.68 × 103, 4.87 × 103), dielectric permittivity (101-103/104), and dielectric loss (< 1.1/0.05) when compared with virgin SR. Significant improvements in the stress-strain and tensile strength properties resulted for SR:CB@NPDGE (10 wt% and 12 wt%) polymer composites. Compressive strength and tensile strength were found to be ~ 12.909 MPa and ~ 136.2 MPa. The peak load is between 0.254 kN to 1.907kN. The elongation at break for SR:CB@NPDGE (12 wt%) polymer composite was found to be 97.14% with 14.07 kN/mm of stiffness. An increase in temperature leads to an increase in dielectric permittivity and ac conductivity for different wt% of CB@NPDGE in SR polymer composites. Further, tensile strength, and tensile strain to failure decreases monotonically with an increase in temperature (100 °C). The present research gives a pathway for the development of organic hybrid polymer-reinforced composite structures for piezoelectric, dielectric, and structural applications.

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Data Availability

The data that supports the findings of this study are enclosed in the manuscript and more data is available from the corresponding author upon reasonable request.

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Acknowledgements

All the authors are thankful to the centre for Advanced Materials Technology (CAMT), MSRIT, Karnataka, Bangalore, centre for nano and material science (CNMS), Jain University, Bangalore, India for the basic characterization of the polymer composites. Department of mechanical engineering Reva University for stress-strain, tensile strength and fracture toughness measurements.

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Authors and Affiliations

  1. Department of Chemistry, Angadi Institute of Technology and Management (AITM), Savagaon Road, 590009, Belagavi, Karnataka, India

    Vinayak Adimule

  2. Department of Metallurgical and Materials Engineering, Bartin University, Bartin, Turkey

    Shashanka Rajendrachari

  3. Department of Mechanical Engineering, Jain College of Engineering and Research, Belagavi, Karnataka, India

    Rayappa Mahale

  4. School of Mechanical Engineering, REVA University, Bengaluru, Karnataka, India

    Rayappa Mahale

  5. Department of Chemistry, MS Ramaiah University of Applied Sciences, MSR Nagar, New BEL Road, Bangalore, Karnataka, India

    Sheetal Batakurki

  6. Department of Chemistry, M S Ramaiah Institute of Technology, 560054, Bangalore, Karnataka, India

    Basappa C Yallur

  7. Chemistry Section, Department of Engineering Science and Humanities, KLE Technological University Dr. M. S. Sheshgiri College of Engineering and Technology, Belagavi, Karnataka, India

    Santosh Nandi

  8. Department of Chemistry, KLE Institute of Technology, Airport Road, Hubli, Karnataka, India

    Gangadhar Bagihalli

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Contributions

Dr. Vinayak Adimule and Dr. Gangadhar B conceived the ideas, and interpretation of the spectral data, and drafted the manuscript and Dr. Basappa C Yallur and Dr. Sheetal Batakurki were involved in dielectric and stress-strain measurements. Prof. Rayappa Mahale and Dr. Santosh Nandi were involved in the synthesis of carbon black from waste tyre powders. Dr. Vinayak Adimule and Dr. Shashanka Rajendrachari took the revision of the manuscript.

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Correspondence to Vinayak Adimule or Shashanka Rajendrachari.

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Adimule, V., Rajendrachari, S., Mahale, R. et al. Dielectric and Mechanical Properties of Silicone Rubber Composites Reinforced by Conductive Carbon Black and Neopentyl Glycol Diglycidyl Ether. Silicon 15, 2811–2828 (2023). https://doi.org/10.1007/s12633-022-02210-8

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