Thermal stability and mechanical properties of ethylenediamine‐modified GO/co‐polyamide nanocomposites

Abstract

We describe ethylenediamine‐modified graphene oxide (GO)/co‐polyamide (GO‐EDA/CO‐PA) nanocomposites prepared via solution blending with EDA‐modified GO (GO‐NH2/EDA). GO was prepared via the improved Hummers method, and EDA was used to modify the GO to add amine groups to graphene. X‐ray diffraction, Fourier‐transform infrared spectroscopy and atomic force microscope analysis showed that the thickness of GO‐NH2/EDA was 1.2 nm. Amino functional groups were introduced onto the GO sheets. Due to the steric hindrance effect of the amino on modified graphene as well as the strong, specific interactions between aminos and carboxyls on CO‐PA, the GO‐NH2/EDA filler was homogeneously dispersed in the matrix, and the interface reaction was effectively improved. The GO‐NH2/EDA could change the crystal structure of pure nylon and the glass transition temperature (Tg). The mechanical properties of the nanocomposites increased dramatically when the GO‐NH2/EDA content is 0.6 wt%. The tensile strength and yield strength of the nanocomposites increased by 50.3 and 134.8%, respectively. The effects of interfacial interaction, increased crystallization, and prevention of agglomeration of GO‐NH2/EDA improved the thermal properties of the GO‐EDA/CO‐PA nanocomposites. This is because the 50% thermal degradation temperature (T‐50%) and the thermal degradation temperature (Td,max) of the nanocomposites increased by 16 and 15°C when the GO‐NH2/EDA content is 0.8 wt%. The nano‐filler improves the thermal diffusivity of the nylon matrix at low temperature. POLYM. COMPOS., 40:3315–3324, 2019. © 2018 Society of Plastics Engineers

Synergism of non‐covalent interaction and ZIF‐8@GO to improve tribological and mechanical properties of carbon fiber reinforced recyclable indole‐based poly(hexahydrotriazine) composites

“…The variation in wear scar width with load increasing is shown in Figure S5D, the wear scar width of IPZGC still narrower than IPGC, and the friction coefficients of the IPZGC is lower than IPGC in the initial stage of friction (Figure S5). These results further indicate that the functionalized GO with ZIF‐8 can provide a better mechanical reinforcement in polymer composites than graphene 40,41 . In addition, due to the introduction of lubricating phase PEW, the friction coefficient and the wear scar width decrease to 0.21 ± 0.004 and 0.16 ± 0.038 mm at high loads, respectively.…”

“…These results further indicate that the functionalized GO with ZIF-8 can provide a better mechanical reinforcement in polymer composites than graphene. 40,41 In addition, due to the introduction of lubricating phase PEW, the friction coefficient and the wear scar width decrease to 0.21 ± 0.004 and 0.16 ± 0.038 mm at high loads, respectively. The elemental mappings of IPEZG worn surface are shown in Figure S4, the F element slight accumulates on the worn scar (Figure S4C), and the Zn element distributed uniformly after tribological test (Figure S4D).…”

Bio‐based PA56/GO nanocomposite fiber with 1.2 GPa strength via in situ precipitation and solvent‐free polymerization

“…Nano‐fillers such as graphene, 14–16 carbon nanotubes, 17 nano‐clay, 18 and cellulose nanocrystal 19,20 have been widely used as reinforcing fillers to improve the properties of polymers. Song et al prepared lightweight and flexible cellulose‐derived carbon aerogel@reduced GO/PDMS composites with outstanding EMI shielding performances and excellent thermal conductivities 21 .…”