Localization of Poly(glycidyl methacrylate) Grafted on Reduced Graphene Oxide in Poly(lactic acid)/Poly(trimethylene terephthalate) Blends for Composites with Enhanced Electrical and Thermal Conductivities

Abstract

Interfacial localization of conductive fillers in a cocontinuous immiscible polymer blend is an efficient way of improving the electrical and thermal conductivities of the composite. Conductive path formation at the interface of a cocontinuous structure is expected to provide high conductivity by a smaller amount of the filler, which can be used for applications as conductive materials. In this study, biobased poly­(lactic acid) (PLA) was blended with poly­(trimethylene terephthalate) (PTT) to make the cocontinuous immiscible polymer blend. Poly­(glycidyl methacrylate) (PGMA) was grafted on reduced graphene oxide (rGO) to make a PGMA-grafted rGO (rGO-PGMA). The epoxy group of GMA on rGO-PGMA reacted with the end groups of both PLA and PTT and localized at the interface between PLA and PTT by a two-step blending procedure to form the conductive path between PLA and PTT. From transmission electron microscopy observation, it was found that rGO-PGMA localized between the interface of PLA and PTT. Both electrical and thermal conductivities of the composite were improved, which was confirmed by the electrical volume resistivity and thermal diffusivity measurements, compared with neat polymers and other blends.

Superior electrical conductivity and mechanical properties of phase‐separated polymer blend composites by tuning the localization of nanoparticles for electromagnetic interference shielding applications

“…As a result, a high thermal diffusivity and lower percolation threshold were achieved in the composite. 45 In addition to covalent interactions, applying shear and annealing can also affect the location of the nanoparticles and hence the dielectric and electrical conductivity. 70/30 wt% PLA/PVDF blends filled with various concentrations of CNTs (0.25, 0.75, and 1 wt%) were prepared via melt mixing and annealing.…”

“…The reaction between the end groups of both PLA and PTT with the epoxy group of GMA in the rGO‐PGMA promoted the location of the rGO at the interface. As a result, a high thermal diffusivity and lower percolation threshold were achieved in the composite 45 . In addition to covalent interactions, applying shear and annealing can also affect the location of the nanoparticles and hence the dielectric and electrical conductivity.…”

Gold-Aptamer-Modified Metal–Organic Framework Drug Delivery Nanosystems for Combined Photothermal/Chemotherapy of Cancer

“…This treatment strategy is safe, noninvasive, and operable, and NIR irradiation can activate photosensitizers to generate heat, which directly kills cancer cells or increases their sensitivity to chemotherapy, thereby reducing the drug dose or overcoming multidrug resistance. , NIR irradiation offers the advantages of low tissue absorption, negligible scattering, and deep penetration, which can control local PTT-induced hyperthermia when combined with chemotherapeutic drugs and reduce the drug side effects . The commonly used organic and inorganic nanoparticles with NIR absorption include gold nanorods (Au NRs), indocyanine green, graphene oxide, and hollow copper sulfide nanoparticles. − Gold nanoparticles of different forms have been extensively used in PTT and have been found to exert significant antitumor effects. , Hao synthesized tetrahedral DNA nanostructured modified Au NRs nanocomposites (GNR@TDN-DOX). The nanocomposite exhibited high photothermal conversion performance under 808 nm NIR irradiation, thereby achieving effective antitumor effects.…”

Effect of Nano-Sized Poly(Butyl Acrylate) Layer Grafted from Graphene Oxide Sheets on the Compatibility and Beta-Phase Development of Poly(Vinylidene Fluoride) and Their Vibration Sensing Performance

“…In agreement with the listed literature sources above, the compatibility of the particles and PVDF matrix seems to be crucial. In this respect the modification of the GO particles with various polymers was already developed by our group, when enhanced compatibility was obtained by grafting of poly(methyl methacrylate), poly(butyl methacrylate), poly(styrene), poly(glycidyl methacrylate) and finally, poly(trimethylsilyloxyethyl methacrylate) [ 50 , 51 , 52 ], and thus their stimuli-responsive capabilities were significantly improved. Moreover, such approach provides a considerably softer and more flexible composite than observed for composites consisting of neat particles [ 53 ].…”