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<p>This research aims to make a polymer composite of polydimethylsiloxane (PDMS)/Novolac base reinforced by B<sub>4</sub>C particles. The hot press method was used to produce a polymer composite with an optimum ratio of 85/15 PDMS/Novolac and 7, 12, 15, 20, and 30% B<sub>4</sub>C. The impact of variation in the set values of B<sub>4</sub>C concentration on the physical, mechanical, and shielding properties of polymer composite was examined through a variety of analytical techniques, including thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), hardness testing, tensile bending strength testing, Fourier transform infrared spectroscopy (FTIR), neutron radiography, and scanning electron microscopy (SEM). The mechanical properties findings revealed that the B15 sample with a concentration of 15% wt. B<sub>4</sub>C had the highest hardness, tensile and bending strength, which were 109 shore A, 203&#xa0;MPa, and 74&#xa0;MPa, respectively. Additionally, the SEM images exposed the equilibrium between porous structure and agglomeration of B<sub>4</sub>C particles in B15 sample. Besides, adding 15–20% B<sub>4</sub>C increased shielding properties by 9–10%. Moreover, the results of TGA demonstrated better thermal stability of polymer composites, with weight loss of less than 30% at 500&#xa0;°C after adding up to 30% B<sub>4</sub>C.</p>

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The effect of B4C addition on the shielding properties of polydimethylsiloxane-novolac composite

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年10月9日

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  • Morteza Sarvari,
  • Hamzeh Foratirad

摘要

This research aims to make a polymer composite of polydimethylsiloxane (PDMS)/Novolac base reinforced by B4C particles. The hot press method was used to produce a polymer composite with an optimum ratio of 85/15 PDMS/Novolac and 7, 12, 15, 20, and 30% B4C. The impact of variation in the set values of B4C concentration on the physical, mechanical, and shielding properties of polymer composite was examined through a variety of analytical techniques, including thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), hardness testing, tensile bending strength testing, Fourier transform infrared spectroscopy (FTIR), neutron radiography, and scanning electron microscopy (SEM). The mechanical properties findings revealed that the B15 sample with a concentration of 15% wt. B4C had the highest hardness, tensile and bending strength, which were 109 shore A, 203 MPa, and 74 MPa, respectively. Additionally, the SEM images exposed the equilibrium between porous structure and agglomeration of B4C particles in B15 sample. Besides, adding 15–20% B4C increased shielding properties by 9–10%. Moreover, the results of TGA demonstrated better thermal stability of polymer composites, with weight loss of less than 30% at 500 °C after adding up to 30% B4C.