Punetha, Vinay Deep Ha, Yu-Mi Kim, Young-O Jung, Yong Chae Cho, Jae Whan 2024-01-19T16:31:19Z 2024-01-19T16:31:19Z 2021-09-02 2020-10-15 0925-4005 https://pubs.kist.re.kr/handle/201004/117992 We report near-infrared (NIR) laser-driven rapid shape recovery in hyperbranched polyurethane/epoxy (HBPU/ EP) composites based on cross-linked graphene photothermal networks. Graphene-based photothermal reinforcements were synthesized by functionalizing graphene oxide (GO) with the epoxy bisphenol A diglycidil ether (DGEBA) to form DGEBA-f-GO, and by subsequent reduction of DGEBA-f-GO to DGEBA-f-reduced graphene oxide (DGEBA-f-rGO). Upon irradiation with an 808 nm NIR laser, the composites with 1 wt% cross-linked DGEBA-f-rGO exhibited a remarkable shape recovery time of 6.5 s (one-fourth that of the composites with 1 wt% GO). The rapid actuation in these composites results from excellent photothermal conversion by the cross-linked DGEBA-f-rGO owing to enhanced pi conjugation in rGO and homogeneous dispersion of graphene networks in the polymer matrix due to covalent interactions. An increase in the epoxy groups on the GO surface also enhanced the mechanical properties of the composites by forming denser cross-linked networks. Graphene-based photothermal networks may be suitable for fabricating robust and remote-controllable rapid shape recovery composites. English ELSEVIER SCIENCE SA NANOCOMPOSITES FUNCTIONALIZATION PERFORMANCE DENDRIMERS POLYMERS Rapid remote actuation in shape memory hyperbranched polyurethane composites using cross-linked photothermal reduced graphene oxide networks Article 10.1016/j.snb.2020.128468 1 SENSORS AND ACTUATORS B-CHEMICAL, v.321 SENSORS AND ACTUATORS B-CHEMICAL 321 scie scopus 000562369400015 2-s2.0-85086772375 Chemistry, Analytical Electrochemistry Instruments & Instrumentation Chemistry Electrochemistry Instruments & Instrumentation Article NANOCOMPOSITES FUNCTIONALIZATION PERFORMANCE DENDRIMERS POLYMERS Polyurethane Functionalized graphene oxide Photothermal Actuation