Water Absorption Behaviour of Vegetable Oil-Modified Bio-Epoxy Composites for Interior Trim Components in Heavy Machinery Applications
10TH ISPEC INTERNATIONAL CONGRESS ON MODERN SCIENTIFIC RESEARCH, Madrid, İspanya, 18 - 25 Nisan 2026, ss.704-713, (Tam Metin Bildiri)
- Yayın Türü: Bildiri / Tam Metin Bildiri
- Basıldığı Şehir: Madrid
- Basıldığı Ülke: İspanya
- Sayfa Sayıları: ss.704-713
- Çukurova Üniversitesi Adresli: Evet
Özet
Hemp oil and coconut oil were blended into epoxy resin at weight ratios of 5, 15, 25, 35, and 45 wt% without chemical pre-treatment. The resulting bioresins were used to produce fiber-reinforced laminates with jute-flax, hemp, and basalt fabrics. All laminates were manufactured by vacuum-assisted resin transfer molding, cured at room temperature for 24 hours, and post-cured at 60 °C for 1 hour. Thirty-three specimen combinations were immersed in tap water at room temperature for 336 hours, and moisture uptake was recorded at regular weighing intervals. Fiber type was the controlling variable. Basalt composites remained below 8.5% weight gain at all oil contents.Jute-flax laminates modified with coconut oil at 15 wt% reached 17.24%, while hemp oil at 35 wt% produced 15.34% in the same system. In the natural fiber groups, absorption increased with oil content up to 25–35 wt% and decreased slightly at 45 wt%. A bio-oil content of 5–15 wt% produced the smallest deviation from the unfilled epoxy baseline in all three fiber systems. Unmodified vegetable oils reduce crosslink density in the epoxy network and open pathways for moistureİ ngress. Natural fibers amplify this effect, while basalt fiber suppresses it. For interior trim components in heavy machinery, where long-term moisture resistance is a service requirement, a bio-oil content of 5–15 wt% provides a balance between sustainability and durability.