Mechanical behaviour of unsaturated polyester resin used for the composite materials has been studied to determine various important parameters, such as tensile and compressive, single edge-notch tensile fracture toughness, flexural properties and fracture energy. Fracture toughness, KIC, and fracture energy, GIC, obtained for the polyester resin lie between the typical values for epoxy resins ...

Epoxy is the most prevalent thermosetting resin in field of polymer composite materials. There has been a growing interest development bio-based epoxy resins as sustainable alternative to conventional petrochemical resins. Advances this recent years have included use various renewable resources, such vegetable oils, lignin, and sugars, direct precursors produce In meantime, bio-oils produced vi...