scholarly journals UV-Curable Hydrophobic Coatings of Functionalized Carbon Microspheres with Good Mechanical Properties and Corrosion Resistance

Coatings ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 439 ◽  
Author(s):  
Jiajia Wen ◽  
Chengchen Feng ◽  
Huijie Li ◽  
Xinghai Liu ◽  
Fuyuan Ding ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Corrosion Resistance ◽  
Thermogravimetric Analysis ◽  
Photoelectron Spectroscopy ◽  
Carbon Microspheres ◽  
Sem Images ◽  
Water Contact ◽  
Pencil Hardness ◽  
Uv Curable ◽  
Functional Product

Polyurethane acrylates (PUAs) are a kind of UV curable prepolymer with excellent comprehensive performance. However, PUAs are highly hydrophilic and when applied outdoors, presenting serious problems caused by rain such as discoloring, losing luster and blistering. Thus, it’s important to improve their hydrophobicity and resistance against corrosion. In this paper, carbon microspheres (CMSs) were modified through chemical grafting method. Active double bonds were introduced onto the surface of organic carbon microspheres (OCMSs) and the functional product was referred to as FCMS. The results of Transmission Electron Microscope (TEM), X-ray Photoelectron Spectroscopy (XPS) and Thermogravimetric analysis (TGA) showed that organic chain segments were successfully connected to the surface of OCMSs and the grafting efficiency was as high as 16%. FCMSs were successfully added into UV-curable polyurethane acrylate prepolymer to achieve a hydrophobic coating layer with good mechanical properties, thermal stability and corrosion resistance. When the addition of FCMSs were 1%, thermogravimetric analysis (TGA) results showed that 5% of the initial mass was lost at 297 °C. The water absorption decreased from 52% to 38% and the water contact angle of the PUA composite increased from 72° to 106°. The pencil hardness increased to 4H and obvious crack termination phenomenon was observed in SEM images. Moreover, the corrosion rate was decreased from 0.124 to 0.076 mm/a.

scholarly journals Superhydrophobic Film on Hot-Dip Galvanized Steel with Corrosion Resistance and Self-Cleaning Properties

Metals ◽  
2018 ◽  
Vol 8 (9) ◽  
pp. 687 ◽  
Author(s):  
Chongchong Li ◽  
Ruina Ma ◽  
An Du ◽  
Yongzhe Fan ◽  
Xue Zhao ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Photoelectron Spectroscopy ◽  
Copper Nitrate ◽  
Galvanized Steel ◽  
Electrochemical Technique ◽  
Etching Time ◽  
Galvanic Replacement ◽  
Water Contact ◽  
X Ray ◽  
Self Cleaning

Super-hydrophobic film with hierarchical micro/nano structures was prepared by galvanic replacement reaction process on the surface of galvanized steel. The effects of the etching time and copper nitrate concentration on the wetting property of the as-prepared surfaces were studied. Scanning electron microscopy/energy dispersive spectroscopy (SEM/EDS), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), and electrochemical technique were employed to characterize the surface morphology, chemical composition, and corrosion resistance. The stability and self-cleaning property of the as-fabricated super-hydrophobic film were also evaluated. The super-hydrophobic film can be obtained within 3 min and possesses a water contact angle of 164.3° ± 2°. Potentiodynamic polarization measurements indicated that the super-hydrophobic film greatly improved the corrosion resistance of the galvanized steel in 3.5 wt % NaCl aqueous solution. The highest inhibition efficiency was estimated to be 96.6%. The obtained super-hydrophobic film showed good stability and self-cleaning property.

MAX Phases: Understanding of Erosion, Corrosion and Oxidation Resistance Properties in TiAlSiCN and TiCrSiCN Compositions

2016 ◽  
Vol 1812 ◽  
pp. 9-15
Author(s):  
Alexander Manulyk
Keyword(s):  
Mechanical Properties ◽  
Corrosion Resistance ◽  
High Temperature ◽  
Thermogravimetric Analysis ◽  
Oxidation Resistance ◽  
Max Phases ◽  
Erosion Corrosion ◽  
C And N ◽  
High Temperature Erosion ◽  
Corrosion And Oxidation

ABSTRACTNewly discovered MAX phases are attractive due to their unique combined properties: mechanical, high temperature, erosion and corrosion resistance. These materials are considered metallic and ceramic at the same time, and they could be the perfect solution for a variety of industrial and scientific applications. In this study, detailed attention has been paid to complex compositions of several transition metals, such as Ti and Cr in TiCrSiCN, whereas Al and Si are recommended for TiAlSiCN. These materials require a combination of both C and N to form the MAX phases (in the “X” position in the formula M(n+1)AXn). The purpose of this study was to investigate the effect of these elements located at the “M”, “A” and “X” positions on the mechanical properties of the materials. The results of the thermogravimetric analysis of TiCrSiCN showed that this phase is stable at temperatures as high as 1400 °C, while the Ti3SiC2 phase is stable up to 1300 °C.

Fabrication of Superhydrophobic Surfaces on Copper Foil with Stearic Acid

2011 ◽  
Vol 295-297 ◽  
pp. 921-924 ◽  
Author(s):  
Li Bo Wang ◽  
Yang Lu ◽  
Xin Xin Cao
Keyword(s):  
Stearic Acid ◽  
Photoelectron Spectroscopy ◽  
Pure Copper ◽  
Copper Substrate ◽  
High Water ◽  
Random Pattern ◽  
Mixed Solution ◽  
Sem Images ◽  
Water Contact ◽  
Porous Architecture

Superhydrophobic surface was prepared by hydrothermal method on copper substrate via immersing the clean pure copper substrate into the mixed solution of H2O2and C2H5OH, and then the substrate was heated at 100°C for 1.5 h, followed by modifying with stearic acid. The product was characterized by scanning electron microscopy and X-ray photoelectron spectroscopy. The wettability of the products was also investigated. It was found that the as-prepared surface had a high water contact angle of about 153°. SEM images of the film showed that many irregular micro-nano sheets distributed on the surface in a random pattern. The special porous architecture, with the low surface energy leads to the surface superhydrophobicity.

scholarly journals Preparation and Performance of a Waterborne UV/Al Low Infrared Emissivity Coating

2020 ◽  
Vol 10 (18) ◽  
pp. 6423 ◽  
Author(s):  
Xiaoxing Yan ◽  
Lin Wang
Keyword(s):  
Mechanical Properties ◽  
Corrosion Resistance ◽  
Orthogonal Experiment ◽  
Uv Curing ◽  
Infrared Emissivity ◽  
Nano Silica ◽  
Uv Curable ◽  
Powder Concentration ◽  
Al Powder ◽  
Silica Slurry

An Al powder filler, nano silica slurry and KH560 were mixed with a prepared waterborne UV-curable coating, and the coating was optimized by an orthogonal experiment. Influences of the Al powder concentration on the gloss, infrared emissivity, brightness, mechanical properties, corrosion resistance and other related properties of the coating were further discussed. The results show that the influence of the Al powder concentration on the gloss was more significant, followed by the UV curing time and nano silica slurry concentration. After studying the key role of the concentration of the Al powder, we found that as the concentration of the Al powder is augmented from 10.0% to 25.0%, the gloss lessened from 19.1% to 8.5%. As the concentration of the Al powder was augmented from 10.0% to 40.0%, the infrared emissivity lessened from 0.649 to 0.083 and the brightness L’ value of the coating was step-by-step augmented and inclined to be stable; in addition, the coating’s mechanical properties reached an excellent level. The coating containing 25.0% Al powder had the best corrosion resistance, surface morphology and comprehensive properties, which can potentially be used for infrared stealth technology.

Facile fabrication of superhydrophobic coatings on concrete substrate

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Pingping Hou ◽  
Zhaohui Zhan ◽  
Shuai Qi ◽  
Yingjie Ma ◽  
Bo Li ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Photoelectron Spectroscopy ◽  
Protective Layer ◽  
Chloride Ion ◽  
Concrete Surface ◽  
Superhydrophobic Coating ◽  
Water Contact ◽  
Protective Properties ◽  
Content Type ◽  
X Ray

Purpose The purpose of this study is to prepare a chemically stable superhydrophobic coating with remarkable mechanical properties and concrete protective properties. Design/methodology/approach One synthetic step was adopted to prepare superhydrophobic coating. The process and product were analyzed and confirmed by fourier transform-infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), water contact angle (WCA), transmission electron microscopy (TEM), scanning electron microscope (SEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). The mechanical properties were confirmed by tensile test. The concrete protective properties were confirmed by solution immersion test and rapid chloride migration coefficient test. Findings MSiO2 nanoparticles (NPs) were chosen to enhance the hydrophobicity of fluorosilicone coatings. With a 4:1 mass ratio of fluorosilicone resin and MSiO2 NPs, the coatings show superhydrophobicity with a WCA of 156° and a SA of 3.1°. In addition, the tensile mechanical property was improved, and the chloride ion diffusion coefficient was decreased significantly after the addition of MSiO2 NPs. Practical implications This new fluorosilicone coating hybrid by MSiO2 NPs could be applied as a concrete protective layer with properties of self-cleaning, antifouling, etc. Originality/value Introduction of MSiO2 NPs hybrid to prepare fluorosilicone coating with superhydrophobicity on concrete surface has not been systematically studied previously.

Surface Structure and Anti-Corrosion Properties of Copper Treated by a Dopamine-Assisted 11-Mercaptoundecanoic Acid Film

CORROSION ◽  
10.5006/0462 ◽  
2012 ◽  
Vol 68 (8) ◽  
pp. 747-753 ◽  
Author(s):  
Y. Chen ◽  
S. Chen ◽  
Y. Lei
Keyword(s):  
Corrosion Resistance ◽  
Surface Structure ◽  
Photoelectron Spectroscopy ◽  
Electrochemical Impedance ◽  
Copper Substrate ◽  
Adhesive Force ◽  
Angle Measurement ◽  
Corrosion Properties ◽  
Water Contact ◽  
Complex Film

An 11-mercaptoundecanoic acid (MUA) film was successfully prepared on the dopamine-modified copper substrates with good adhesive force and corrosion resistance. The formation and surface structure of the film were characterized by water contact angle measurement, scanning electron microscopy (SEM), and x-ray photoelectron spectroscopy (XPS). The inhibition behavior of the complex film was investigated using Tafel polarization curves and electrochemical impedance spectroscopy (EIS) in 3.5 wt% sodium chloride (NaCl) solution. The electrochemical results show that the poly(dopamine)/MUA complex film improves greatly the corrosion resistance and interfacial adhesive force on copper substrate. The inhibition efficiency of the poly(dopamine)/MUA complex film increases to 97.7%.

scholarly journals A Mild Method for Surface-Grafting PEG Onto Segmented Poly(Ester-Urethane) Film with High Grafting Density for Biomedical Purpose

Polymers ◽  
2018 ◽  
Vol 10 (10) ◽  
pp. 1125 ◽  
Author(s):  
Lulu Liu ◽  
Yuanyuan Gao ◽  
Juan Zhao ◽  
Litong Yuan ◽  
Chenglin Li ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Molecular Weight ◽  
Photoelectron Spectroscopy ◽  
Platelet Adhesion ◽  
Film Surface ◽  
Contact Angles ◽  
Marginal Effect ◽  
Water Contact ◽  
Surface Hydrophilicity ◽  
Grafting Density

In the paper, poly(ethylene glycol) (PEG) was grafted on the surface of poly(ester-urethane) (SPEU) film with high grafting density for biomedical purposes. The PEG-surface-grafted SPEU (SPEU-PEG) was prepared by a three-step chemical treatment under mild-reaction conditions. Firstly, the SPEU film surface was treated with 1,6-hexanediisocyanate to introduce -NCO groups on the surface with high density (5.28 × 10−7 mol/cm2) by allophanate reaction; subsequently, the -NCO groups attached to SPEU surface were coupled with one of -NH2 groups of tris(2-aminoethyl)amine via condensation reaction to immobilize -NH2 on the surface; finally, PEG with different molecular weight was grafted on the SPEU surface through Michael addition between terminal C = C bond of monoallyloxy PEG and -NH2 group on the film surface. The chemical structure and modified surface were characterized by FT-IR, 1H NMR, X-ray photoelectron spectroscopy (XPS), and water contact angle. The SPEU-PEGs displaying much lower water contact angles (23.9–21.8°) than SPEU (80.5°) indicated that the hydrophilic PEG chains improved the surface hydrophilicity significantly. The SPEU-PEG films possessed outstanding mechanical properties with strain at break of 866–884% and ultimate stress of 35.5–36.4 MPa, which were slightly lower than those of parent film, verifying that the chemical treatments had minimum deterioration on the mechanical properties of the substrate. The bovine serum albumin adsorption and platelet adhesion tests revealed that SPEU-PEGs had improved resistance to protein adsorption (3.02–2.78 μg/cm2) and possessed good resistance to platelet adhesion (781–697 per mm2), indicating good surface hemocompatibility. In addition, due to the high grafting density, the molecular weight of surface-grafted PEG had marginal effect on the surface hydrophilicity and hemocompatibility.

scholarly journals Preparation and Characteristics of Biocomposites Based on Steam Exploded Sisal Fiber Modified with Amphipathic Epoxidized Soybean Oil Resin

Materials ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 1731 ◽  
Author(s):  
Bo Lei ◽  
Yong Liang ◽  
Yanhong Feng ◽  
Hezhi He ◽  
Zhitao Yang
Keyword(s):  
Mechanical Properties ◽  
Soybean Oil ◽  
Decomposition Temperature ◽  
Resin Content ◽  
Epoxidized Soybean Oil ◽  
Sisal Fiber ◽  
Fracture Mechanisms ◽  
Scanning Calorimetry ◽  
Sem Images ◽  
Water Contact

Sisal fiber was pretreated by continuous screw extrusion steam explosion to prepare steam exploded sisal fiber (SESF) preforms. An amphipathic bio-based thermosetting resin with poor mechanical properties was cured by epoxidized soybean oil (ESO) and citric acid (CA). The obtained resin was used to modify SESF preforms and prepare eco-friendly biocomposites. The molar ratios (R) of carboxylic groups to epoxy groups and resin contents in biocomposites were adjusted. The biocomposites were characterized by thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), Fourier-transfer infrared spectroscopy (FT-IR), tensile testing, scanning electron microscopy (SEM), water absorption and water contact angle measurements. The maximum thermal decomposition temperature of the biocomposites was 373.1 °C. The curing efficiency of the resin in the biocomposites improved with the increase of resin content, and reached a maximum at R = 1.2. The tensile strength of the biocomposites reached a maximum of 30.4 MPa at R = 1.2 and 40% resin content. SEM images showed excellent interfacial bonding and fracture mechanisms within the biocomposites. The biocomposites exhibited satisfactory water resistance. ESO resin cured with polybasic carboxylic acid is therefore a good bio-based modifier for lignocellulose, that prepare biocomposites with good mechanical properties, hydrophobicity, and thermostability, and which has a potential application in packaging.

scholarly journals Hema-Functionalized Graphene Oxide: a Versatile Nanofiller for Poly(Propylene Fumarate)-Based Hybrid Materials

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Eugeniu Vasile ◽  
Andreea M. Pandele ◽  
Corina Andronescu ◽  
Aida Selaru ◽  
Sorina Dinescu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Graphene Oxide ◽  
Hybrid Materials ◽  
Photoelectron Spectroscopy ◽  
Unsaturated Polyester ◽  
Crosslinking Density ◽  
Covalent Modification ◽  
Sem Images ◽  
Functionalized Graphene Oxide ◽  
Poly Propylene

AbstractPoly(propylene fumarate) (PPF) is a linear unsaturated polyester which has been widely investigated for tissue engineering due to its good biocompatibility and biodegradability. In order to extend the range of possible applications and enhance its mechanical properties, current approaches consist in the incorporation of various fillers or obtaining blends with other polymers. In the current study we designed a reinforcing agent based on carboxylated graphene oxide (GO-COOH) grafted with 2-hydroxyethyl methacrylate (GO@HEMA) for poly(propylene fumarate)/poly(ethylene glycol) dimethacrylate (PPF/PEGDMA), in order to enhance the nanofiller adhesion and compatibility with the polymer matrix, and in the same time to increase the crosslinking density. The covalent modification of GO-COOH was proved by Fourier-transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), thermogravimetric analysis (TGA) and Raman spectroscopy. The mechanical properties, water uptake capacity, morphology, biodegradability, mineralization and in vitro cytotoxicity of PPF/PEGDMA hybrid materials containing GO@HEMA were investigated. A 14-fold increase of the compressive modulus and a 2-fold improvement in compressive strength were observed after introduction of the nanofiller. Moreover, the decrease in sol fraction and solvent swelling in case of the hybrid materials containing GO@HEMA suggests an increase of the crosslinking density. SEM images illustrate an exfoliated structure at lower nanofiller content and a tendency for agglomeration at higher concentrations. Finally, the synthesized hybrid materials proved non-cytotoxic to murine pre-osteoblast cells and induced the formation of hydroxyapatite crystals under mineralization conditions.

Effect of chemical modification on slip resistance and mechanical properties of rubber

2015 ◽  
Vol 35 (2) ◽  
pp. 119-125
Author(s):  
Ranganathan Mohan ◽  
Raja Sundaresan ◽  
Bhabendra Nath Das
Keyword(s):  
Mechanical Properties ◽  
Surface Modification ◽  
Photoelectron Spectroscopy ◽  
Abrasion Resistance ◽  
Material Design ◽  
Surface Modifications ◽  
Vertical Force ◽  
Water Contact ◽  
Slip Resistance ◽  
Surface Modified

Abstract Shoe sole material, design, tread pattern and surface modifications influence slip resistance while walking and running. Thermoplastic styrene-butadine-styrene rubber, commercially known as TPR, is one of the materials widely used as shoe soles. This type of sole is subjected to chemical treatment known as halogenation to increase adhesion characteristic with the upper. The coefficient of friction (COF) is the ratio between the horizontal force and the vertical force when tested with the help of slip resistance test equipment SATRA STM 603. It is also known that footwear outsole surface modification affects COF at the footwear floor interfaces. In this study, plain TPR shoe sole samples were surface modified by treating with 2.0 wt% trichloroisocyanuric acid (TCI) in methyl ethyl ketone (MEK). The effect of surface modifications was studied by water contact angle measurements, Fourier transform infrared (FTIR) and X-ray photoelectron spectroscopy (XPS), surface roughness and scanning electron microscopy (SEM). The surface modified sole samples were also tested for other mechanical properties such as tensile strength, elongation at break, hardness and abrasion resistance to find out the extent of changes in those essential functional properties. It was observed that surface modification of TPR sole increased COF and reduced strength, elasticity and abrasion resistance properties. However, there was no significant change in hardness.

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