Pengaruh Variasi Temperatur Terhadap Sifat Hidrofobik Komposit PDMS-Silika Sekam Padi-Graphene Oxide
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Abstract
Polydimethylsiloxane (PDMS)-based electrical insulators are widely used in outdoor power systems due to their inherent hydrophobic properties. However, the hydrophobicity of pure PDMS tends to diminish upon prolonged exposure to heat. This study aims to investigate the effect of varying heat treatment temperatures on the hydrophobicity of PDMS composites reinforced with silica derived from rice husk ash and graphene oxide, using contact angle measurements. The composites were fabricated via spin coating onto glass substrates and subsequently heated at five different temperatures—25 °C, 50 °C, 75 °C, 100 °C, and 125 °C—for one hour. Contact angles were measured using the sessile drop method and ImageJ software. The results indicate that the contact angle increased progressively with temperature, rising from 101.9° at 25 °C to a peak of 107.7° at 100 °C, before decreasing to 100.2° at 125 °C due to thermal degradation. All samples across the tested temperature range remained hydrophobic (θ > 90°), with 100 °C identified as the optimum temperature.
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