“…Unsaturated polyester resins exhibit many desirable properties, such as high strength and modulus, excellent chemical, solvent, and salt water resistance, good thermal and electrical properties, outstanding adhesion to various substrates, and easy processability under various conditions. Liquid rubbers have been used with unsaturated polyester resin to increase the impact properties of unsaturated polyester, [4][5][6][7][8] fracture toughness and strain to failure of the neat resin have also been improved with block copolymers of carboxyl terminated acrylonitrile butadiene copolymer (CTBN), and hydroxyl-terminated acrylonitrile butadiene copolymer (HTBN) 9 , low profile additives such as poly (methylmethacrylate), poly (vinyl acetate), polypropylene glycol, [10][11][12] and polyurethanes. 13 Modification with these polymeric materials have enhanced toughness behaviour, but failed to enhance thermomechanical properties.…”