Ramanathan et al. (2008) reported an unprecedented shift in the glass transition temperature (GO ) of a polymer nanocomposite with functionalized graphene sheets. They observed that, by the addition of functionalized graphene sheets (1 wt%) to the polyacrylonitrile (PAN), the of the composite material increased by 40°C, whereas, when only 0.5 wt% was added to polymethyl methacrylate (PMMA), they observed a 30°C rise in [111]. Also, they observed that by addition of 1 wt% graphene to PMMA, an 80% increase resulted in the elastic modulus and a 20% increase resulted in the ultimate tensile strength. Their comparative research concluded that monolayered functionalized graphene serves as the best nanofiller among all examined nanofillers [111].