Preparation and characterization of hexamethylenediamine-modified graphene oxide/Co-polyamide nanocomposites

Abstract

<jats:p> The hexamethylenediamine-modified graphite oxide/Co-polyamide (GO-HMD/CO-PA) nanocomposites were successfully produced by solution blending method. X-ray diffraction, Fourier-transform infrared spectroscopy, scanning electron microscopy, and atomic force microscopy analyses revealed that GO with a large number of oxygen-containing functional groups was successfully obtained by a modified Hummer’s method. For GO-HMD, the amino and amide bonds were introduced into the GO sheets, making the sheets more incompact, fluffy, and irregular. GO-HMD with a content of less than 1 wt% could be uniformly dispersed in the CO-PA matrix. A series of analysis indicated that the tensile strength, yield strength, and elongation at break of 0.4 wt% GO-HMD/CO-PA increased by 73.4%, 185.9%, and 42.3%, respectively. Thermogravimetric analysis showed that GO-HMD played the role of the heterogeneous nucleation in the matrix and could change the crystal type of the polyamide. The T <jats:sub>50%</jats:sub> and T<jats:sub>d</jats:sub> <jats:sub>, max</jats:sub> of nanocomposites were 14.3°C and 11.8°C higher than pure polyamide, respectively. The nanofiller GO-HMD contributes to the increase of the thermal diffusivity at low temperature. </jats:p>

Tuning the bandgap and absorption behaviour of the newly-fabricated Ultrahigh Molecular weight Polyethylene Oxide- Polyvinyl Alcohol/ Graphene Oxide hybrid nanocomposites

“…Radiation attenuation was calculated using formula (11). 45 N ¼ N o exp ðÀµxÞ (11) ðN o Þ indicates the number of particles of radiation passing without any sample, (N) is the number of radiation particles passing through the thickness (x) of the absorber to be counted during a specified period, and (μ) the irradiation attenuation coefficient of the source. 45 The shape of lateral scattering reduces the absorption according to Lambert's law.…”

Cross-linked graphene oxide framework to enhance pervaporation separate property of waterborne polyurethane in food packaging materials

“…Comparing to the modify agent of -HS (Yang et al, 2018), hydrazine (Burshtein et al, 2022), NaBH 4 (Shen et al, 2021), hydroquinone (Sabry et al, 2022), concentrated H 2 SO 4 (Kong et al, 2018), alumina powder (Wu et al, 2021), etc. Diamine has better dispersibility and gas sensitivity (Wang et al, 2020), and be expected to increase GO surface active sites, reduce polymer lattice defects and nanopores.…”

The effect of BN/Al2O3 in-situ self-assembling on thermal conductivity of polypropylene composites

“…Thermally conducting, electrically insulating polymer composites are widely used in LED lighting, automotive electronics, microelectronics, heat exchange equipment, etc. [1][2][3] Usually, polymers have excellent insulating ability but low thermal conductivity. Al 2 O 3 , AlN, BN, SiO 2 , etc.…”