The influence of graphene nanoplatelets on mechanical and shape memory properties of thermoplastic polyurethane/ acrylonitrile butadiene styrene nanocomposites Farzaneh Memarian1*, Abdolhossein Fereidoon1, Hossein Ali Khonakdar2 1Faculty of Mechanical engineering, Semnan University, Semnan, Iran 2Leibniz Institute of Polymer Research, D-01067 Dresden, Germany Corresponding author: Farzaneh Memarian (Email: farzane.memarian@gmail.com) Abstract shape memory and mechanical properties of a new polymer blend nanocomposites based on crystalline thermoplastic polyurethane (TPU) and acrylonitrile butadiene styrene (ABS) reinforced with graphene nanoplatelets were investigated. The TPU/ABS polymer blend which was prepared by melt blending technique is a thermo-responsive material which benefits the glass transition of TPU as a driving force to be recovered. Two types of graphene nanoplatelets were used, single or few-layered graphene (SLGS) and multi-layered graphene sheet (MLGS). Loading only 0.5 wt% MLGS in to the blend improved tensile strength about 55%. Also, Young's modulus of the blend was increased 28% by loading 1.5 wt% MLGS. In comparison, TPU/ABS/SLGS nanocomposites showed greater Young's modulus but lower tensile strength. The presence of 0.5 wt% SLGS caused up to 42% and 66% increment in tensile strength and Young's modulus, respectively. Moreover, a significant increase of 180% in Young's modulus is observed, by adding 1.5 wt% SLGS. Shape recovery of nanocomposites reinforced with SLGS was higher than nanocomposites reinforced with MLGS. By the presence of only 1 wt% SLGS, shape recovery reaches to more than 99%. Furthermore, shape fixity of both types of nanocomposites was comparable and in the most cases it was larger than 97%, even after three cycles. Keywords: Thermoplastic polyurethane; Acrylonitrile butadiene styrene; shape memory property; mechanical property; Single layered graphene, Multi layered graphene