Treated graphene nanoplatelets reinforced shape memory polyurethane
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Date
2019-05
Authors
Muhamad Izzat Bin Mat Saleh
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Abstract
Shape memory polymers (SMP) are smart materials which has a stimuli-responsive properties and able to change a constituent shape to its original shape by triggering an appropriate stimulus. The objective of functionalization of GNP is to study the modification of surface F-GNP nanoparticles in order to enhance the dispersion stability without affect the properties of GNP. In this study, the shape memory polyurethane (SMPU) has been synthesized by two stage bulk polymerization method by adding up the functionalized graphene nanoplatelets (F-GNP) with various amount of filler. The graphene nanoplatelet (GNP) undergoes the acid treatment process to produce F-GNP at various working temperature and the effect was analyzed by several characterization method. The F-GNP 60 sample was selected to be used as filler in fabrication of SMPU by considering the attachment of functional group, ratio of defect, degree of crystallinity, surface morphology and colloidal stability. The shape memory and mechanical properties were analyzed when F-GNP 60 was added to SMPU system. The tensile strength and modulus of elasticity of shape memory polyurethane incorporated functionalized graphene nanoplatelets (F-GNP/SMPU) increased with addition of F-GNP 60 content up to 2 wt%. However, the elongation at break increased with F-GNP 60 content up to 1 wt% and decreasing with additional F-GNP 60 content due to less crystalline on soft segement structure. In conclusion, the functionalization of GNP by acid treatment at 60°C has influenced the properties of SMPU with different amount of content.