Abstract
Bisphenol-F-based benzoxazine was copolymerized with epoxy to improve matrix's mechanical properties. Polymer composites reinforced with hybrid GNTs (carbon nanotube, CNT, and graphene nanoplates, GNPs) were fabricated by hot pressing to enhance the mechanical properties and fatigue life. This research includes: (1) The effect of varied benzoxazine content on mechanical properties of the composites. (2) The effect of varied CNT content on mechanical properties of the composites. (3) The synergetic effect of varied GNP and CNT content on mechanical properties of the composites. (4) The enhancement of hybrid GNTs on mechanical properties and fatigue life of laminate composites. (5) The improvement on nano materials for film and bulk composites. The results show that correct mixture of benzoxazine and epoxy can improve tensile and flexural properties, but decrease impact strength. CNT and hybrid GNTs also improve the mechanical properties of composites. However, when the amount of reinforcement exceeds certain amount, the aggregation will occur because of their geometric characteristic and then decrease the mechanical properties. The carbon fiber reinforced polymer(CFRP) results show that all mechanical properties(tensile, flexural, impact, ILSS, torsion and torsion fatigue) are increase due to hybrid GNTs improve the interfacial strengths between fiber and matrix. From bulk and film strength increasing rate, all the experimental results show that film is better than bulk. Controlling the thickness of the material decreases the degree of aggregation and then improve the dispersion.