Experimental Investigations of Thermal, Chemical and Water Absorption Analysis of Filler and Fiber Based Composites for Marine Applications
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Abstract
The thermal stability, chemical makeup, and extent of hydrophilicity of natural fiber-based composites are critical factors to be studied, especially in the scope of marine applications. Therefore, this study investigates the thermal, chemical, and water absorption characteristics of epoxy-based composite novel samples fabricated using the hand lay-up fabrication method. The primary reinforcements used for the samples were orange peel and rose petal fabrics, and betel nut and tamarind seed powders were used as bio-fillers in the epoxy matrix (Epoxy resin as Araldite LY 556 and HY 951 as hardener). The ratios used during the fabrication were 10:1 for the resin and hardener and 30:70 for the fiber-to-matrix weight ratio. The TGA results show that all the configurations of the sample have their thermal degradation initiated at similar temperature ranges, that is, onset at 310–320°C and DTG peaks at 370–380°C. The results demonstrated that epoxy/tamarind/betel nut (ETB) exhibited the highest thermal stability based on the residue mass. FTIR spectra confirmed the presence of epoxy-lignocellulosic functional groups in all samples. Spectral similarities were observed in the bio fillerbased hybrid composites compared to the only fiber-based samples. The water absorption data were saturated in the range from approximately 0.7% for EOB (Epoxy/Orange/Betel Nut) composite and ER (Epoxy/Rose) composite to 2.35% for ETB (Epoxy/Tamarind/Betel Nut) composite. The thermal conductivity test also showed a range of 0.198–0.254 W/m·K across all composite samples.