Synthesis, characterization, and properties of silicone grafted epoxy/acrylonitrile butadiene styrene/graphene oxide nanocomposite with high adhesion strength and thermal stability

Abstract

To improve thermal, mechanical and adhesion properties, epoxy resin was modified with methyl phenyl silicone (MPS), acrylonitrile butadiene styrene (ABS) and graphene oxide (GO). In order to increase compatibility and stability, MPS intermediate was grafted on epoxy resin through condensation reaction. Transmission electron microscopy images showed well dispersion of GO particles in the system proving successfully preparation of the MPS grafted epoxy/ABS/GO nanocomposite. Single lap shear strength for steel‐epoxy/carbon fiber composite joint in sample containing 15% MPS and 2% ABS improved up to 108% compared to neat epoxy. Such an improvement occurred when only 5% MPS, 2% ABS and 0.1% GO were used showing GO could decrease required content of modifiers in this case. Tensile strength of sample containing 5% MPS and 2% ABS was 49.89 MPa and it reached 55.23 MPa by adding 0.1% GO while it was 37.12 MPa in pure epoxy. Nanocomposite modified sample had a residual char of 20 wt%. at 600°C and increment of 30°C in initial degradation temperature and 7°C in maximum degradation temperature compared to pure epoxy. These finding beside 23% increasing in calculated activation energy using Kessinger's and FWO method's proved significantly improved thermal stability of modified epoxy resin. Scanning electron microscope images of fractured surface of specimens showed micro size domains obtained by phase separation cause toughness improvement and crack energy absorption.

Enhance the mechanical properties of epoxy resin reinforced with functionalized graphene oxide nanocomposites prepared by atom transfer radical polymerization

“…It is reported that some rigid nanoparticles such as nanoclays, [26] nanosilica, [27] graphene oxide, [28][29][30][31] and nanotubes [32] can reinforce epoxy resin. Zhang et al improved the tensile properties of aliphatic epoxy resins by adding multi-walled carbon nanotubes treated with mixed acid.…”

Non‐isothermal DSC curing kinetics study of silicone‐modified epoxy/ABS/GO nanocomposite

“…TEM images of nanocomposite samples containing 0.1 wt.% GO that is published in our previous work showed well dispersion of GO in the epoxy matrix. GO nano sheets tend to agglomerate when the amount of GO increased to 0.2 wt.% 16 . High strength of GO sheets, good compatibility as well as well dispersion of them in epoxy matrix are responsible for improving of the impact strength in specimen containing 0.1 phr GO.…”

“…GO nano sheets tend to agglomerate when the amount of GO increased to 0.2 wt.%. 16 High strength of GO sheets, good compatibility as well as well dispersion of them in epoxy matrix are responsible for improving of the impact strength in specimen containing 0.1 phr GO.…”

“…Despite the presence of the nitrile group peak at 2235 cm À1 in the uncured ABS-containing samples, this peak disappeared in the cured specimens which could be due to its reaction with hydroxyl groups of the epoxy in the mixture. 16 Regarding the existence of hydroxyl, F I G U R E 1 FTIR spectra of uncured epoxy and cured samples epoxy, amine, and hydrogen groups in the mixture, the elimination or fading of peak at nitrile group in the cured samples could be assigned to any of these reactions but it maybe not possible to determine the exact share of each reaction in this article.…”

“…15 The effect of methyl phenyl silicone resin (MPS), acrylonitrile butadiene styrene (ABS) and graphene oxide (GO) on the mechanical strength, thermal stability and adhesion strength of epoxy resins has been investigated in our previous work. 16 Incorporation of these modifiers significantly improved the mechanical and thermal properties of epoxy resin. In addition to changing the physical properties, the curing reaction of epoxy resin can also be affected in the presence of MPS, ABS, and GO.…”