Iranian Polymer Journal (English Edition), 2026 (SCI-Expanded, Scopus)
Hemp seed oil and epoxy resin were made into a novel bio-based epoxy system without chemical treatment with this study. Vegetable oil is added to the resin at five different rates (10%-50%), samples were produced with cotton, jute/flax, and hemp fabric as reinforcement for this bio resin. The vacuum-assisted resin transfer molding process was used. The samples were tested for tensile strength, impact strength, microhardness, and ignition loss. Moreover, fiber matrix bonding was observed using morphological analysis. Tensile test outcomes indicated 10% oil added cotton and jute/flax fabric samples had better tensile strength than the pure epoxy sample by 3.94% and 14.42%, respectively. In the impact test, adding 40% oil to jute/flax and hemp fabric enabled the samples to absorb an average of 1.73–4.19 times more energy. The ignition lost results reflect the addition of oil to epoxy resin reduces the ignition resistance by 1.04–1.11 times. The incorporation of 10% oil enhances tensile strength, while the addition of 40% oil results in the attainment of maximum impact resistance values. In the hardness test, an increase of approximately 13%–29% was observed in all fabric types with a 10% oil addition; however, an increase in friction loss was recorded as the oil content increased. These biocomposites can be regarded as a sustainable alternative in areas requiring energy absorption and flexibility and with their significant elastic behavior, they have the possibility of being used in areas such as automotive interior trim parts, building materials and aerospace.