THE EFFECT OF RICE HUSK SILICA VARIATION ON THE SURFACE STRUCTURE AND HYDROPHOBIC PROPERTIES OF PDMS SHEETS

Emiliah; Ratnawulan Ratnawulan; Yenni Darvina; Riri Jonuarti

doi:10.24036/ptxv6t83

Authors

Emiliah Universitas Negeri Padang Author
Ratnawulan Department of Physics, Universitas Negeri Padang, Jl. Prof. Dr. Hamka Air Tawar Padang 25131, Indonesia Author
Yenni Darvina Department of Physics, Universitas Negeri Padang, Jl. Prof. Dr. Hamka Air Tawar Padang 25131, Indonesia Author
Riri Jonuarti Department of Physics, Universitas Negeri Padang, Jl. Prof. Dr. Hamka Air Tawar Padang 25131, Indonesia Author

DOI:

https://doi.org/10.24036/ptxv6t83

Keywords:

PDMS, silica, hydrophobic, dielectric strength, electrical insulator

Abstract

Polydimethylsiloxane (PDMS) is a polymer with high hydrophobic properties and good thermal stability, making it widely used in various functional material applications. However, the stability of its hydrophobic properties can be improved by adding filler particles such as silica. This study aims to analyze the effect of varying concentrations of silica from rice husks on the surface structure and hydrophobic properties of PDMS sheets. PDMS-silica sheets were fabricated using the spin coating method with varying silica concentrations of 1 wt%, 2 wt%, 3 wt%, 4 wt%, and 5 wt%. Characterization was performed using a Scanning Electron Microscope (SEM) to observe the surface morphology and water contact angle measurement to determine the degree of hydrophobicity. The results showed that the addition of rice husk silica affected the surface morphology of PDMS, where an increase in silica concentration caused the surface to become rougher and less homogeneous. The optimum condition was obtained at a variation of 4 wt% with a maximum contact angle value of 141.3°, which indicates an increase in hydrophobic properties due to changes in the surface structure. Thus, the addition of rice husk silica proved to be effective in increasing the hydrophobic properties of PDMS through modification of its surface morphology.

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