Liquid crystalline polymer nanocomposites reinforced with in-situ reduced graphene oxide

Abstract

Abstract. In this work liquid-crystalline polymer (LCP) nanocomposites reinforced with in-situ reduced graphene oxide are investigated. Graphene oxide (GO) was first synthesized by the Hummers method, and the kinetics of its thermal reduction was assessed. GO layers were then homogeneously dispersed in a thermotropic liquid crystalline polymer matrix (Vectran ® ), and an in-situ thermal reduction of GO into reduced graphene oxide (rGO) was performed. Even at low rGO amount, the resulting nanocomposites exhibited an enhancement of both the mechanical properties and the thermal stability. Improvements of the creep stability and of the thermo-mechanical behavior were also observed upon nanofiller incorporation. Furthermore, in-situ thermal reduction of the insulating GO into the more electrically conductive rGO led to an important surface resistivity decrease in the nanofilled samples.

Novel electroactive polyamide 12 based nanocomposites filled with reduced graphene oxide

“…Thermal reduction of GO seemed to be an easy and effective route to develop graphene based nanocomposites, but elevated temperatures (from 300°C to 1,000°C) are generally required to achieve a satisfactory GO reduction . This is the reason why this process generally requires polymers with elevated thermal stability , like liquid‐crystalline polymers (LCP) .…”

Thermal sensitivity of carbon nanotube and graphene oxide containing responsive hydrogels

“…The outstanding mechanical and conductive properties of carbon nanoparticles (CNPs), together with their unique structure and low density, place them among the most common fillers. Carbon nanofiber and carbon nanotubes (CNT) [14][15][16][17][18][19][20] 1,2 , N. Miklósi 1 and its derivatives [21][22][23][24], mainly graphene oxide (GO), have attracted marked interest in the last few years. In biomedical applications, however, the uncertainty surrounding the toxicity of CNTs [14] could affect choices of nanocarbon filler.…”

Thermal transitions and molecular dynamics in main‐chain liquid crystalline polyester/fullerene nanocomposites

“…Moreover, mechanical and electrical property enhancement was found in graphene nanoplatelet/LCP nanocomposites . Finally, regarding effects on molecular dynamics, Pedrazzoli et al reported in a recent publication that in situ reduced graphene oxide had no effects on the secondary γ and β relaxations studied by dynamic mechanical analysis (DMA) in a thermotropic MCLCP, Vectran ® , whereas the segmental α relaxation became slightly slower ( T g shifting by 4°C to higher temperatures on addition of 3 wt% graphene oxide).…”