Development of shape memory polymers based on TPU/ABS blends containing MWCNT 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 In this work, shape memory polymers based on the TPU/ABS blends containing pristine and organo-modified multi-walled carbon nanotubes (MWCNTs) were prepared by melt blending technique. Mechanical, Izod impact and shape memory properties of the samples were investigated. Microstructures of hybrid nanocomposites were studied by means of scanning electron microscopy (SEM). The morphology results showed that the pristine MWCNTs were dispersed homogenously throughout the TPU matrix. Unexpectedly, the ABS droplets in nanocomposites with organo-modified MWCNTs were greater than ABS droplets in TPU/ABS/CNT nanocomposites. These differences were attributed to different degrees in interfacial interactions between the modified MWCNT and TPU matrix. The presence of modified MWCNT in TPU matrix could have increased the differences in surface energy and polarity of TPU and ABS phases and it has disturbed the compatibility of the blend considerably. Loading 2 wt.% MWCNTs resulted in a significant improvement in mechanical properties such as tensile strength and Young's modulus. Also, addition of this amount of MWCNT results in 32% increment in impact strength of the nanocomposites at -50 ˚C. In addition it was revealed that, the mechanical properties of nanocomposites with functional MWCNTs are feeble than those containing pristine MWCNTs. The shape memory results showed that the shape recovery and fixity of TPU/ABS blend improved significantly upon increasing MWCNTs loading. Keywords: Thermoplastic Polyurethane (TPU); Acrylonitrile butadiene styrene (ABS); Shape memory; MWCNT; organo-modified MWCNT.