Thermal and mechanical properties of liquid silicone rubber composites filled with functionalized graphene oxide

Abstract

To improve the thermal and mechanical properties of liquid silicone rubber (LSR) for application, the graphene oxide (GO) was proposed to reinforce the LSR. The GO was functionalized with triethoxyvinylsilane (TEVS) by dehydration reaction to improve the dispersion and compatibility in the matrix. The structure of the functionalized graphene oxide (TEVS-GO) was evaluated by Thermogravimetric analysis (TGA), Fourier transform infrared (FTIR) spectra, X-ray diffraction (XRD), and energy dispersive Xray spectroscopy (EDX). It was found that the TEVS was successfully grafted on the surface of GO. The TEVS-GO/LSR composites were prepared via in situ polymerization. The structure of the composites was verified by FTIR, XRD, and scanning electron microscopy (SEM). The thermal properties of the composites were characterized by TGA and thermal conductivity. The results showed that the 10% weight loss temperature (T 10 ) increased 16.08C with only 0.3 wt % addition of TEVS-GO and the thermal conductivity possessed a two-fold increase, compared to the pure LSR. Furthermore, the mechanical properties were studied and results revealed that the TEVS-GO/LSR composites with 0.3 wt % TEVS-GO displayed a 2.3-fold increase in tensile strength, a 2.79-fold enhancement in tear strength, and a 1.97-fold reinforcement in shear strength compared with the neat LSR.

Thermal conductivity of epoxy adhesive enhanced by hybrid graphene oxide/AlN particles

“…1(b) is the magnified pattern of GO. A narrow and sharp diffraction of graphite can be observed at 2h = 26.5°, corresponding to the characteristic peak of the C (0 0 2) plane with a D-spacing of 3.36 Å [25]. After oxidation treatment, the diffraction peak of GO shifts to 2h = 10.4°, indicating that the interlayer space increase to 8.50 Å.…”

“…Zhang et al [32] added 1 wt% GO into the PVDF/CNT composite, the enhancement in thermal conductivity is very obvious compared with the PVDF/CNT composite at the same CNT content. Zhao et al [25] fabricated liquid silicone rubber (LSR) composite filled with 0.3 wt% functionalized GO, the research result revealed a double increase in thermal conductivity compared with pure LSR.…”

“…Graphene is a perfect two-dimensional (2-D) structure with the lattice of sp 2 -bonded carbon atoms [21], which possesses ultrahigh thermal conductivity ($5000 W/m K), high Young's modulus (1 TPa) and fracture strength (125 GPa) [22]. However, it is different to achieve uniform dispersion for graphene in the epoxy matrix due to the intrinsic van der Waals attraction and high surface energy [23][24][25]. On the other hand, GO is similar to the graphene in the physical structure and properties which can be easily synthesized [26][27][28][29].…”

Ionic liquid functionalized graphene oxide for enhancement of styrene‐butadiene rubber nanocomposites

“…Covalent and non‐covalent surface functionalizations of GO are two effective methods to improve interfacial interaction between GO and non‐polar rubbers. Covalent functionalization approach includes the reaction of coupling agents and in situ polymerization . However, this process could cause undesired permanent structure changes of GO, and it may usually be conducted in organic solvents, which would not be environmental friendly .…”

Expanded graphite/polydimethylsiloxane composites with high thermal conductivity

“…Secondly, EG can be compacted into porous graphite foams under mechanical pressure without external binder because of its self‐aggregation . Finally, the compatibility between graphite and polymer is good which can be considered as the precondition for preparing EG/polymer composites . Consequently, interpenetrating networks structured composites with high thermal conductivity and high flexibility may be obtained by composing EG with PDMS.…”