A main chain thermotropic liquid crystalline polyester named poly (4

4'-bis (6-hydroxyhexyloxy) binphenyl phenylsuccinate (PBDPS) reinforced by the combination of carbon nanotube (CNT

1-dimensional carbon nanofiller) and graphene (G

2-dimensional carbon nanofiller) was prepared in solution.Transmission electron microscopy was used to study the dispersion of the carbon nanofillers and morphology of the resulting nanocomposites.Interaction between two carbon nanofillers was observed

particularly for the nanocomposite with 2 wt% of CNT and G (PCNT1G1 (2%)).Raman and fluorescence spectrometry were used to investigate the π-π interaction between the carbon nanofillers and PBDPS chains.The phenomenon of fluorescence quenching and the dramatically decreased intensity of Raman absorption peaks confirmed the formation of π-π interaction between the nanofillers and PBDPS.Electronic universal testing machine was utilized to evaluate the tensile strength of the materials.The results suggested that due to the interaction between CNT and G

the mechanical properties of all composites were reinforced considerably.The addition of only 0.5 wt% CNT and G enhanced the tensile strength of the composites by 27.6% compared to pure PBDPS.With increasing the content of the carbon nanofillers

the tensile strength of the composites decreased gradually.Shape memory behavior and recovery stress were recorded by dynamic mechanical analysis

and it was found that the addition of CNT and G together considerably enhanced the shape recovery stress and maintained the shape fixing ratio effectively.The recovery stress of the composites was improved by 150% compared to pure PBDPS at the addition of 2 wt% of the nanofillers.On the other hand

both CNT and G exhibited negative effect on the chain mobility of PBDPS

especially with high content of the carbon nanofillers

thus decreasing the shape recovery ratios.