Synthesis and corrosion Resistance of silane coupling agent modified graphene oxide/waterborne polyurethane

In this work, the effect of modified graphene oxide and polytetrafluoroethylene (PTFE) on the tribological and anticorrosion properties of waterborne polyurethane (WPU) was studied. The modified graphene oxide (MGO) was obtained by the surface functionalization modification of graphene oxide (GO) with isophorone diisocyanate (IPDI), and MGO/WPU composite coating and MGO-PTFE/WPU composite coating with different mass fractions of MGO were prepared. The tribological and electrochemical experiment results demonstrated that the tribological properties of the coating and the corrosion resistance of the worn coating were effectively enhanced under the synergistic effect of MGO and PTFE. Finally, a mechanism was proposed to explain the improvement in anticorrosion performance of the worn coating.

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Controllable synthesis and enhanced microwave absorption properties of silane-modified Ni0.4Zn0.4Co0.2Fe2O4 nanocomposites covered with reduced graphene oxide

RSC Advances ◽

10.1039/c5ra18668d ◽

2015 ◽

Vol 5 (114) ◽

pp. 93739-93748 ◽

Cited By ~ 39

Author(s):

Peijiang Liu ◽

Zhengjun Yao ◽

Jintang Zhou

Keyword(s):

Graphene Oxide ◽

Reduced Graphene Oxide ◽

Coupling Agent ◽

Silane Coupling Agent ◽

Adsorption Properties ◽

Controllable Synthesis ◽

Absorption Properties ◽

Microwave Absorption Properties ◽

Reduced Graphene ◽

Silane Coupling

Silane coupling agent modified Ni0.4Zn0.4Co0.2Fe2O4 ferrite decorated reduced graphene oxide nanocomposites were firstly synthesized, and their extraordinary microwave adsorption properties were investigated.

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Study on UV-protection and hydrophobic properties of cotton fabric functionalized by graphene oxide and silane coupling agent

Pigment & Resin Technology ◽

10.1108/prt-09-2018-0098 ◽

2019 ◽

Vol 48 (3) ◽

pp. 237-242 ◽

Cited By ~ 1

Author(s):

Feilong Shi ◽

Jia Xu ◽

Zhanzhu Zhang

Keyword(s):

Contact Angle ◽

Graphene Oxide ◽

Cotton Fabric ◽

Coupling Agent ◽

Silane Coupling Agent ◽

Uv Protection ◽

Curing Temperature ◽

Hydrophobic Properties ◽

Content Type ◽

Silane Coupling

Purpose This study aims to prepare UV protection and hydrophobic fabric through modifying cotton fabric by graphene oxide and silane coupling agent. The graphene oxide and silane coupling agent (KH570) are anchored on the cotton fabric by a stable chemical bond. Design/methodology/approach Graphene oxide was prepared by modified Hummers method. The fabric sample was treated with graphene oxide and silane coupling agent KH570 using simple dipping-padding-drying method. The effects of the dosage of graphene oxide, silane coupling agent KH570 and curing temperature were determined by single variable experiment and orthogonal experiment, The UVA and UVB transmittances in ultraviolet light of the sample fabric were characterized, and the contact angle test method with water was used to indicate the hydrophobicity of the sample fabric. The structure and surface of the fabric were analyzed using Fourier-transform infrared spectroscopy and scanning electron microscopy. Findings The cotton fabric was successfully modified by graphene oxide and silane coupling agent KH570. Compared with the untreated fabric, the surface of the fabric was smooth, and there was no gap on the fiber. The graphene oxide, silane coupling agent KH570 and cotton fabric combined tightly. The UPF value of the modified fabric was 50+, and the contact angle reached 138.1°. It had excellent UV protection and hydrophobic properties. Research limitations/implications Although graphene oxide and silane coupling agents KH570 had successfully endowed the cotton fabric with good UV protection and hydrophobic properties, graphene oxide and silane coupling agent KH570 are expensive and used in large quantities. There are certain limitations in the actual life and production process. Practical implications After treating with silane coupling agent, the hydrophilic fabric treated with graphene oxide is being translated into hydrophobic, and graphene oxide bonded with cotton. The modified fabrics also have excellent UV protection. This fabric can be used for outdoor sports such as clothes and tents. Originality/value Cotton fabric treated with graphene oxide generally by simple dip-dry-cure method is hydrophilic and graphene oxide is easy to drop. The usage of silane coupling agent KH570 as a crosslinking agent to link graphene oxide and cotton fibers has not been reported yet. The modified fabrics have both UV protection and hydrophobic properties.

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Modified geopolymer-based wood adhesive using waterborne polyurethane

BioResources ◽

10.15376/biores.15.4.7573-7585 ◽

2020 ◽

Vol 15 (4) ◽

pp. 7573-7585

Author(s):

Dawei Pan ◽

Hanzhou Ye ◽

Xiaoqian Wang ◽

Yang Zhang

Keyword(s):

Shear Strength ◽

Coupling Agent ◽

Silane Coupling Agent ◽

Waterborne Polyurethane ◽

Wood Adhesive ◽

Geopolymer Matrix ◽

Silane Coupling ◽

The Matrix ◽

Alkaline Conditions ◽

Wood Strength

Geopolymer binders show great potential in the application of eco-friendly wood composite adhesives. The applicability of organic-inorganic hybrid-reinforced geopolymer composites as plywood binder was investigated. In this study, a geopolymer-based wood adhesive was fabricated by mixing a matrix-geopolymeric slurry; a toughening agent, waterborne polyurethane; and a silane coupling agent, that served as the covalent “bridge” between the waterborne polyurethane with a geopolymer matrix. The results showed that the waterborne polyurethane exhibited excellent compatibility with the geopolymer and served as a flexibilizer, which transformed the matrix from a microfractured structure to a denser morphology. Moreover, the shear strength of bonded plywood and the morphology of the fracture surface after the tensile measurement were measured. The resulting geopolymer/wood interface was well bonded, and the interfacial bonding strength was higher than the wood strength matrix after modification. The introduction of waterborne polyurethane and silane coupling agent improved the water resistance of the composites and increased the wet shear strength of plywood from 0 MPa to 0.35 MPa. Notably, a weak wood/alkali interface was formed under alkaline conditions due to the strong diffusion of alkali metal ions between the interfaces.

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