A novel method to prepare homogeneous biocompatible graphene‐based PDMS composites with enhanced mechanical, thermal and antibacterial properties

Abstract

A negative pressure assisted mixing method was applied to prepare homogeneous graphene‐based polydimethylsiloxane (PDMS) composite. The problem of graphene agglomeration in polymer matrix was well overcome by using the graphene microsphere aerogels. They possess unique porous structure and excellent adsorption capacity, enabling the PDMS solution can uniformly fill into the reduced graphene oxide aerogel microspheres (rGOAMs) or GO aerogel microspheres (GOAMs) under reduced pressure. Raw reduced graphene oxide (rGO) and graphene oxide (GO) were added into PDMS by a simple ultrasonic assisted mixing method as a comparison. rGOAMs‐PDMS and GOAMs‐PDMS composites displayed higher tensile strength, Young's modulus and storage modulus than rGO–PDMS and GO–PDMS composites. In addition, the thermal stability of graphene‐based PDMS composites was also significantly improved. Finally, rGOAMs‐PDMS and GOAMs‐PDMS composites performed much better antibacterial activity than that of rGO‐PDMS and GO‐PDMS composites, which demonstrated that this kind of graphene‐based PDMS composites could display a great potential application in biomedical field. POLYM. COMPOS., 40:E1397–E1406, 2019. © 2018 Society of Plastics Engineers

Significant enhancement of dielectric properties of graphene oxide filled polyvinyl alcohol nanocomposites: Effect of ionic liquid and temperature

“…The first stage of degradation around 349°C is mostly due to the elimination of residual acetate groups present in PVA skeletal structure because of incomplete hydrolysis to form polyenes. [ 36 ] The second degradation peak around 474°C is mostly due to the loss of by‐products formed during the first stage degradation. The shifting of first stage degradation peak to 451°C in case of PVA/3GO explains about the improved thermal stability of the GO based PVA nanocomposites in comparison with the virgin PVA.…”

Highly Conductive PDMS Composite Mechanically Enhanced with 3D-Graphene Network for High-Performance EMI Shielding Application

“…This result can be further confirmed by the measured conductivity of the composite (5900 S/m), which shows slight degradation after 100 stretching and release cycles. tensile strength and the degradation of the elongation at break could be attributed to the following aspects: (1) the 3D structure of GN restricts the motion of PDMS molecule chains [36]; (2) graphene tubes have excellent tensile modulus and lower elongation at break. Lots of energy can be absorbed by GN when the strain occurred, leading to the improvement of Young's modulus and tensile strength [34]; (3) graphene tube has smaller elongation at break compared with PDMS.…”

“…The EMI SE is an evaluation criterion of material's ability to attenuate the power of electromagnetic waves during the electromagnetic waves transmitted through. The EMI SE of PDMS/GN composites and pristine PDMS in X-band (8-12 GHz) can be extracted from the measured the S-parameter of the composite according the following equation [32][33][34][35][36][37][38][39]:…”

Vinyl‐functionalized polyborosiloxane for improving mechanical and flame‐retardancy performances of silicone rubber foam composites

“…Such outstanding physicochemical properties of SRF materials have led to their wide use in building construction, transportation and electrical applications. [4][5][6][7][8] However, the pendent organic groups of the linear polydimethylsiloxane (PDMS) chains are easily ignited upon exposure to a high temperature environment or flame attack, which seriously limits their application. [9][10][11] Therefore, it is necessary to explore an efficient methodology to overcome this problem.…”