Superhydrophobic hybrid membranes by grafting arc-like macromolecular bridges on graphene sheets: Synthesis, characterization and properties

Functionalized graphene oxide (named GO-Si) was synthesized with graphene oxide and triethoxyvinylsilane (TEVS) using tetrahydrofuran solution by γ-ray irradiation. TEVS was successfully covered onto GO sheets, and the polysilane content on GO-Si was increased upon increasing the absorbed dose. The structures of GO-Si were verified by atomic force microscopy, Fourier transform infrared spectroscopy, and X-ray photoelectron spectroscopy. The resultant GO-Si was dispersed into α,ω-dihydroxypolydimethylsiloxane to prepare room temperature vulcanized silicone rubber composites (named SR/GO-Si) by solution casting. The dispersion of GO-Si was more uniform than that of GO. Compared to that of pure SR, the thermal conductivity of SR/GO-Si-1.95 composites was increased 1.5-fold, and its tensile strength and elongation at break increased 78.6 and 71.4%, respectively. It was expected that SR/GO-Si would have potential application as the thermal interface material.

Section: Resultsmentioning

confidence: 99%

Radiation synthesis of polysilane‐modified graphene oxide for improving thermal conductivity and mechanical properties of silicone rubber

Dai

Jiao

et al. 2019

“…Mo et al . successfully grafted the two amino groups as terminal polydimethylsiloxane (NH 2 ‐PDMS‐NH 2 ) onto the surface of GO.…”

Section: Graphene‐based Polymer Composite Membranesmentioning

confidence: 99%

“…SEM images and WCA photos (insert of SEM image) for (a) GO membrane and (b) GO‐ g ‐Arc PDMS‐0.80 hybrid membrane; the cross‐sectional SEM images of (c) GO and (d) GO‐ g ‐Arc PDMS‐0.80 hybrid membrane . [Color figure can be viewed at wileyonlinelibrary.com]…”

Section: Graphene‐based Polymer Composite Membranesmentioning

confidence: 99%

“…The photos captured during separation of pump oil dyed with oil red from the surface of water by 2‐GO‐ g ‐Arc PDMS‐0.80 membrane. (a) The membrane floats on water with dry surface; (b) the membrane close to oil; (c) taken the membrane out of water with adsorbing oil; and (d) no water on surface of the membrane after separation test . [Color figure can be viewed at wileyonlinelibrary.com]…”

Section: Graphene‐based Polymer Composite Membranesmentioning

confidence: 99%

“…The photos captured from self‐cleaning action of superhydrophobic GO‐ g ‐Arc PDMS‐0.80 hybrid membrane, performing on a glass at an angle of approximately 10° with white chalk microparticles. (a) White chalk powder (<100 μm) was spread over the membrane surface; (b–g) water droplet slowly dropped and rolled away with chalk powders from on the surface; and (h) a cleaned surface domain . [Color figure can be viewed at wileyonlinelibrary.com]…”

Section: Graphene‐based Polymer Composite Membranesmentioning

confidence: 99%

See 2 more Smart Citations

Recent developments in graphene‐based polymer composite membranes: Preparation, mass transfer mechanism, and applications

Huang

Wang

et al. 2019

The shortage of water resources is a problem concerned by all countries in the world. In order to solve this problem of human survival, membrane separation technology promotes the development of water treatment field by virtue of its own advantages of high efficiency and low consumption. Membrane separation technology combined with nanomaterials has brought surprises to researchers. Graphene has unique structure and properties, making graphene and its derivatives have very good potential in water treatment and selective separation. Graphene-based materials combined with traditional polymer materials have great potential in the field of membrane separation technology. In this article, we first introduce the preparation methods and transport mechanism of graphenebased membranes, and then summarize the recent applications of graphene oxide/polymer composite membranes in water purification, gas separation, self-cleaning, and oil-water separation. It is expected to become the next generation of functional composite membranes.

Effect of ultraviolet‐A radiation on surface structure, thermal, and mechanical and electrical properties of liquid silicone rubber

Lin

Yin

Wang

et al. 2019

Liquid silicone rubber (LSR) products outdoors are often subjected to high intensity of ultraviolet (UV)-A radiation. However, the influence of UV-A radiation on LSR is rarely studied. To study the influence of UV-A radiation on LSR, the surface of LSR with UV-A aging time was characterized by tests at different detection depths [X-ray photoelectron spectroscopy (XPS), energy dispersive X-ray spectroscopy (EDS), and Fourier transform infrared spectroscopy (FTIR)]. The operation properties (thermal stability and mechanical and electrical properties) for outdoor insulators were also analyzed. It was found that the porous surface and the loose layer of LSR increased, but the growth rate of them decreased as UV-A aging time increased. SiO 2 fillers were lost in the surface. C H bonds in CH 3 and CH 3 in Si CH 3 increased with aging time. The increased crosslinking density increased the thermal stability, hardness, dielectric loss tangent, relative dielectric constant, and volume resistivity and decreased elongation-at-break. The mechanical strength initially increased and then decreased. Based on the proposed aging mechanism, the UV-A resistance of LSR can be improved by reducing the amount of hydrogencontaining silicone oil and by increasing the molecular weight of raw rubber.