Synthesis of Novel Anionic Fluorinated Polyacrylate Emulsion and its Application in Leather Waterproofing

2012 ◽  
Vol 496 ◽  
pp. 511-514
Author(s):  
Wei Xu ◽  
Li Fen Hao
Keyword(s):  
Contact Angle ◽  
Processing Time ◽  
Processing Parameters ◽  
Single Factor ◽  
Hydrophobic Property ◽  
Water Contact ◽  
Fluorinated Acrylate ◽  
Fluorinated Polyacrylate ◽  
Acrylate Emulsion ◽  
Emulsion Processing

Novel anionic fluorinated polyacrylate emulsion (FLHA) was synthesized and characterized using Infrared spectrum (IR). Then it was used as waterproofing agent to treat wet blue leather and the effects of various parameters, such as dose of fluorinated acrylate emulsion, processing time, temperature, etc., on hydrophobic property of the treated crust leather were also investigated using single factor experimental method. Results showed that water contact angle (WCA) on the grain and flesh layers of the resultant leather had similar rule controled by dose of the FLHA, processing time and temperature and increased with augment of those factors. The most preferable processing parameters of the above factors were 6% (based on the weight of the treated wet blue leather), 60 minutes and 30 °C, repectively. Thus, WCA on the grain and flesh layers of the resultant leather could attain 130° and 136°.

Preparation and Application of Novel Cationic Fluorinated Polyacrylate Latex in Leather Waterproofing

2012 ◽  
Vol 496 ◽  
pp. 515-518 ◽  
Author(s):  
Wei Xu ◽  
Li Fen Hao
Keyword(s):  
Contact Angle ◽  
Infrared Spectrum ◽  
Processing Time ◽  
Processing Parameters ◽  
Single Factor ◽  
Hydrophobic Property ◽  
Water Contact ◽  
Fluorinated Acrylate ◽  
Fluorinated Polyacrylate ◽  
Acrylate Latex

Novel cationic fluorinated polyacrylate latex was synthesized and characterized using Infrared spectrum (IR). Then it was utilized as waterproofing agent to treat wet blue leather and the effects of various parameters, such as dose of fluorinated acrylate latex, processing time, temperature, etc., on hydrophobic property of the treated crust leather were also investigated using single factor experimental method. Results showed that water contact angle (WCA) on the grain and flesh sides of the resultant leather possessed similar rule controled by dose of the CFBDH, processing time and temperature and increased with augment of those factors. The most preferable processing parameters of the above factors were individually 6% (based on the weight of the treated wet blue leather), 60 minutes and 30 °C. Thus, WCA on the grain and flesh sides of the resultant leather could attain 136° and 143°.

Study on Preparation and Surface Properties of Fluorinated Acrylate Hydrophobic Polymer Film

2015 ◽  
Vol 1088 ◽  
pp. 101-106
Author(s):  
Jing Chen ◽  
Qian Cheng ◽  
Shun Quan Chen
Keyword(s):  
Contact Angle ◽  
Water Content ◽  
Polymer Film ◽  
Water Contact ◽  
Fluorinated Acrylate ◽  
Fluorinated Polyacrylate ◽  
Hydrophobic Polymer ◽  
Air Interface ◽  
Surface Morphologies ◽  
Lower Water Content

A new fluorinated acrylate terpolymer hydrophobic polymer was prepared by emulsifier-free inverse microemulsion polymerization using methyl methacrylate (MMA) and hexafluorobutyl acrylate (HFBA) as monomers, and methyl polyethylene glycol methacrylate (MPEGMA) as polymerizable emulsifier. Membrane properties were characterized by means of FT-IR, SEM and Contact Angle Meter. The effect of fluorinated monomer content, water content in the inverse precursor microemulsion on the surface morphologies and hydrophobicity of the polymer film was mainly discussed. Morphological studies of the fluorinated polyacrylate polymers by SEM showed that discrete granular microstructures were obtained from precursor microemulsion with higher water content. On the other hand, smooth and continuous surface morphologies were found with lower water content. Contact angle revealed that the fluorine preferentially enriched at the film-air interface and more hydrophobic that the film-glass interface. The amount of HFBA had significantly effects on the film properties. The water contact angle of the film-air interface increased as the amount of HFBA increased from 0 ml to 4 ml and then remained almost unchangeable. The film formed from the fluorinated polyacrylate polymer with higher water content in the precursor microemulsion exhibited better hydrophobicity in comparison with the film formed from the fluorinated polyacrylate polymer with the lower water content, and it confirmed that rough surface have high water contact angles.

Effect of Plasma-Induced Polymerization on Contact Angle of Paper

2011 ◽  
Vol 396-398 ◽  
pp. 1619-1623
Author(s):  
Zhao Ping Song ◽  
Jun Rong Li ◽  
Hui Ning Xiao
Keyword(s):  
Contact Angle ◽  
Photoelectron Spectroscopy ◽  
Contact Angle Measurement ◽  
Angle Measurement ◽  
Polymer Grafting ◽  
Hydrophobic Property ◽  
Cellulose Fibres ◽  
Water Contact ◽  
X Ray ◽  
Factors Associated

Hydrophobic modification of cellulose fibres was conducted by plasma-induced polymer grafting in an attempt to increase the hydrophobicity of paper. Two hydrophobic monomers, i.e., butyl acrylate (BA) and 2-ethylhexyl acrylate (2-EHA) were grafted on cellulose fibres, induced by atmospheric cold plasma. Various influencing factors associated with the plasma-induced grafting were investigated, including the contact time and reaction temperature with monomers, and the dosage of monomers. Contact-angle measurement, infrared spectrum (IR), X-ray photoelectron spectroscopy (XPS) and scanning electron microscope (SEM) were used to ascertain the occurrence of the grafting. The results showed that the hydrophobic property of the modified paper sheet was improved significantly after the plasma-induced grafting. The water contact angle on the surface of the paper reached up to higher than125°.

Super-Hydrophobic Film Prepared with Reduced Graphene Sheets and its Application as Corrosion Barrier to Copper

2013 ◽  
Vol 365-366 ◽  
pp. 1100-1105 ◽  
Author(s):  
Peng Wang ◽  
Dun Zhang
Keyword(s):  
Contact Angle ◽  
Copper Surface ◽  
Cathodic Current Density ◽  
Corrosion Process ◽  
Graphene Sheets ◽  
Cathodic Current ◽  
Hydrophobic Property ◽  
Time Saving ◽  
Water Contact ◽  
Reduced Graphene

Electrophoretic deposition is proposed to fabricate super-hydrophobic film on copper surface with reduced graphene sheets (RGSs). The resulted film was characterized with contact angle meter, scanning electron microscopy and so on. It is found that the film presents super-hydrophobic property with water contact angle of 150.4°. Air can be trapped in the island-like structure and intensify the wettability of film. Electrochemical measurements prove that super-hydrophobic film can inhibit corrosion process of underlying copper by inducing both anodic and cathodic current density. This method for super-hydrophobic film fabrication is facial and time-saving, and it will expand the application of RGSs in mechanical engineering.

Tailoring Surface Hydrophobicity of Commercial Polyimide by Laser-Induced Nanocarbon Texturing

2020 ◽  
Vol 8 (3) ◽  
Author(s):  
Moataz Abdulhafez ◽  
Angela J. McComb ◽  
Mostafa Bedewy
Keyword(s):  
Contact Angle ◽  
Surface Characterization ◽  
Surface Engineering ◽  
Processing Parameters ◽  
Surface Hydrophobicity ◽  
Spot Size ◽  
Contact Angles ◽  
Water Contact ◽  
Wide Range ◽  
Surface Nanostructure

Abstract The growth of laser-induced nanocarbons, referred to here as laser-induced nanocarbon (LINC) for short, directly on polymeric surfaces is a promising route toward surface engineering of commercial polymers. This paper aims to demonstrate how this new approach can enable achieving varied surface properties based on tuning the nanostructured morphology of the formed graphitic material on commercial polyimide (Kapton) films. We elucidate the effects of tuning laser processing parameters on the achieved nanoscale morphology and the resulting surface hydrophobicity or hydrophilicity. Our results show that by varying lasing power, rastering speed, laser spot size, and line-to-line gap sizes, a wide range of water contact angles are possible, i.e., from below 20 deg to above 110 deg. Combining water contact angle measurements from an optical tensiometer with LINC surface characterization using optical microscopy, electron microscopy, and Raman spectroscopy enables building the process–structur–property relationship. Our findings reveal that both the value of contact angle and the anisotropic wetting behavior of LINC on polyimide are dependent on their hierarchical surface nanostructure which ranges from isotropic nanoporous morphology to fibrous morphology. Results also show that increasing gap sizes lead to an increase in contact angles and thus an increase in the hydrophobicity of the surface. Hence, our work highlight the potential of this approach for manufacturing flexible devices with tailored surfaces.

Effect of Processing Parameters of Hydrophobic Film on Ceramic Tile

2017 ◽  
Vol 263 ◽  
pp. 97-102
Author(s):  
Prapatsorn Prathungthai ◽  
Sutham Srilomsak ◽  
Wimonlak Sutapun ◽  
Sukasem Watcharamaisakul ◽  
Lada Punsukumtana
Keyword(s):  
Contact Angle ◽  
Research Study ◽  
Sessile Drop ◽  
Sol Gel ◽  
Processing Parameters ◽  
Measuring Apparatus ◽  
Optical Contact ◽  
Water Contact ◽  
Curing Conditions ◽  
Design Expert

In this research study the fabricated of hydrophobic of SiO2 nanoparticles was modified with tetraethylorthosilicate (TEOS), poly-(dimethylsiloxane) (PDMS) and methyltriethoxysilane (MTES) by using a sol-gel method. The effects of precursors, coating techniques and curing conditions were investigated. A water contact angle (WCA) measurement done using a sessile drop method with an optical contact measuring apparatus. Morphologies of the hydrophobic films were depicted using scanning electron microscopy (SEM). All data were analyzed using Design Expert® software. Results shown that a morphology of hydrophobic films had nanoroughness as evidenced by high contact angle. The largest predicted WCA of these is 150.306 degrees, which will be obtained with a TEOS:SiO2:PDMS:MTES ratio equal to 7.00:3.374:2.75:3.00 wt.% respectively. It is coated using a dipping technique and oven cured at 400°C.

scholarly journals INFLUENCE OF POLYETHYLENE OXIDE CONTENT ON SOME CHARACTERISTICS OF PLA/CS FILMS LOADING NIFEDIPINE

2017 ◽  
Vol 55 (6) ◽  
pp. 716 ◽  
Author(s):  
Nguyen Thuy Chinh ◽  
Trang Thi Thu Nguyen ◽  
Mai Thi Tran ◽  
Cong Van Do ◽  
Huynh Duc Mai ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Contact Angle ◽  
Polylactic Acid ◽  
Field Emission ◽  
Polyethylene Oxide ◽  
Oxide Content ◽  
Hydrophobic Property ◽  
Water Contact ◽  
Scanning Electron

This work mentions the effect of polyethylene oxide (PEO) content on some characteristics and properties of polylactic acid (PLA)/chitosan (CS) films loading nifedipine (NIF). The water contact angle, droplet size values and Field Emission Scanning Electron Microscopy (FESEM) images  of the films are used to investigate their morphology and hydrophobicity. The obtained results show that the hydrophobic property of the PLA/CS/NIF films is improved by the presence of PEO. Besides, the PLA/CS/NIF films containing PEO have tighter structure and water absorbed ability less than those of the PLA/CS/NIF films

Investigation of Different Membrane Porosities on the Permeate Flux of Direct Contact Membrane Distillation

2021 ◽  
Vol 889 ◽  
pp. 85-90
Author(s):  
Asmaa Elrasheedy ◽  
Mohammed Rabie ◽  
Ahmed Hassan El-Shazly ◽  
Mohamed Bassyouni ◽  
Ahmed Abd El-Moneim ◽  
...  
Keyword(s):  
Contact Angle ◽  
Direct Contact ◽  
Solution Concentration ◽  
Membrane Distillation ◽  
Permeate Flux ◽  
Hydrophobic Property ◽  
Water Contact ◽  
Direct Contact Membrane Distillation ◽  
Static Water ◽  
Membrane Porosity

In the present study the surface morphology of electrospun fibers at different polystyrene (PS) solution concentration was studied by SEM imaging to determine the best PS solution concentration yielding continuous uniform beadles fibers. Contact angle measurements of the optimum fabricatedPS-18 membrane confirmed the super hydrophobic property of the membrane that exhibited a static water contact angle of 145o. Numerical investigation of the performance of PS-18 membrane at different membrane thicknesses and porosities on direct contact membrane distillation showed that increasing the membrane porosity increases the permeate flux considerably.

Codepositon of Dopamine/Calcium on Titanium to Enhancing Implant Integration

2013 ◽  
Vol 647 ◽  
pp. 129-132 ◽  
Author(s):  
Xin Ming Zhang ◽  
Zhao Yang Li ◽  
Xu Bo Yuan ◽  
Zhen Duo Cui ◽  
Xian Jin Yang ◽  
...  
Keyword(s):  
Gene Expression ◽  
Contact Angle ◽  
Bone Repair ◽  
Titanium Surface ◽  
Titanium Implant ◽  
Hydrophobic Property ◽  
Water Contact ◽  
Implant Integration ◽  
Bare Titanium ◽  
Calcium Modification

Calcium plays an important role in various stages of bone repair. Surface calcium modification is a common method to improve the biocompatibility of titanium implant. In this work, anovel facile codeposition dopamine/calcium on titanium alloy method for orthopedics applications was developed. SEM-EDS results showed calcium microspheres uniformly deposited on titanium surface with dopamine. Water contact angle showed the dopamine/calcium modification layer improved the bare titanium surface hydrophobic property. And the dopamine/calcium coating enhanced the cell proliferation by MTT test. The ALP gene expression also showed the dopamine/calcium coating may enhance the cell early differentiation. Such facile method has great potential in titanium applications.

scholarly journals Fabrication of diverse carbon forms and their reversed applications in hexane/water separation

2020 ◽  
Vol 82 (7) ◽  
pp. 1296-1303
Author(s):  
Rujia Xie ◽  
Zhenxing Fang ◽  
Jiefeng Yan ◽  
Wei Wang ◽  
Xuan Cao ◽  
...  
Keyword(s):  
Contact Angle ◽  
Water Contact Angle ◽  
Carbon Foam ◽  
Carbonization Temperature ◽  
Hydrophobic Property ◽  
Water Contact ◽  
Water Separation ◽  
Carbonization Process ◽  
Carbon Foams ◽  
Melamine Foam

Abstract Melamine foam is an important material in production and life. A series of porous carbon foams were obtained through a simple carbonization process of melamine foam at different temperatures. The carbon foams obtained at the carbonization temperature of 400 and 600 °C reveal a hydrophobic and even super-hydrophobic property (water contact angle larger than 150°) with a hexane adsorption much larger than that of melamine foam. However, the carbon foam obtained at the carbonization temperature of 800 °C reveals a super-hydrophilic property (water contact angle smaller than 5°) due to its severest shrinkage during the carbonization process. Interestingly, this series of carbon foams have an excellent performance in oil adsorption. However, the carbon membranes derived from the 800 °C carbon foam reveals oleophobicity under water (the adsorbed water at the surface was extremely important), which allows the penetration of water and blocks the infiltration of hexane at the same time. These different carbon forms have reversed applications in hexane/water separation.

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