Abstract
Simultaneous implementation of two polymer hybridisation routes, namely, interpenetrating polymer network (IPN) formation and nanofiller (nano Al2O3) addition, resulted in considerable increments in the mechanical performance of GFRP composites. Improvements of ∼18%, ∼8%, ∼14%, ∼19 %, and ∼29% in flexural strength, tensile strength, interlaminar shear strength (ILSS), critical strain energy release rate (GIC) during mode-I interlaminar fracture toughness (ILFT), and GIIC during mode-II ILFT values of nano-Al2O3 modified composites, respectively, were observed over composite without nano Al2O3. Composite with 0.1 wt.% of nano Al2O3 showed the highest mechanical properties in all the modes of testing except for mode-II ILFT testing, where composite with 0.4 wt.% of nano Al2O3 showed the highest toughness value. The synergy between the constituents and the thermal stability of the composites were analyzed via Fourier transform infrared spectroscopy and differential scanning calorimetry, respectively. Fractography was performed to understand the composites' failure criteria and toughening mechanisms.
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