scholarly journals Preparation of UV-Curable Low Surface Energy Polyurethane Acrylate/Fluorinated Siloxane Resin Hybrid Coating with Enhanced Surface and Abrasion Resistance Properties

Materials ◽  
2020 ◽  
Vol 13 (6) ◽  
pp. 1388
Author(s):  
Jianping Zhou ◽  
Chunfang Zhu ◽  
Hongbo Liang ◽  
Zhengyue Wang ◽  
Hailong Wang
Keyword(s):  
Surface Energy ◽  
Abrasion Resistance ◽  
Hybrid Film ◽  
Annealing Treatment ◽  
Annealed Film ◽  
Surface Hydrophobicity ◽  
Water Contact ◽  
Uv Curable ◽  
Polyurethane Acrylate ◽  
Low Surface Energy

Low surface energy coatings have gained considerable attention due to their superior surface hydrophobic properties. However, their abrasion resistance and sustainability of surface hydrophobicity are still not very satisfactory and need to be improved. In this work, a series of utraviolet (UV)-curable fluorosiloxane copolymers were synthesized and used as reactive additives to prepare polyurethane acrylate coatings with low surface energy. The effect of the addition of the fluorinated graft copolymers on the mechanical durability and surface hydrophobicity of the UV-cured hybrid films during the friction-annealing treatment cycles was investigated. The results show that introducing fluorosiloxane additives can greatly enhance surface hydrophobicity of the hybrid film. With addition of 2 wt.% fluorosiloxane copolymers, the water contact angle (WCA) value of the hybrid film was almost tripled compared to that of the pristine PU film, increasing from 58° to 144°. The hybrid film also showed enhanced abrasion resistance and could withstand up to about 60 times of friction under a pressure of 20 kPa. The microstructure formed in the annealed film was found to contribute much to achieve better surface hydrophobicity. The polyurethane acrylate/fluorinated siloxane resin hybrid film prepared in this study exhibits excellent potential for applications in the low surface energy field.

scholarly journals A Novel Synthetic UV-Curable Fluorinated Siloxane Resin for Low Surface Energy Coating

Polymers ◽  
2018 ◽  
Vol 10 (9) ◽  
pp. 979 ◽  
Author(s):  
Chunfang Zhu ◽  
Haitao Yang ◽  
Hongbo Liang ◽  
Zhengyue Wang ◽  
Jun Dong ◽  
...  
Keyword(s):  
Surface Energy ◽  
Photoelectron Spectroscopy ◽  
Contact Angles ◽  
Proton Nuclear Magnetic Resonance ◽  
Energy Materials ◽  
Uv Curable ◽  
X Ray ◽  
Low Surface Energy ◽  
Low Concentrations ◽  
Siloxane Polymers

Low surface energy materials have attracted much attention due to their properties and various applications. In this work, we synthesized and characterized a series of ultraviolet (UV)-curable fluorinated siloxane polymers with various fluorinated acrylates—hexafluorobutyl acrylate, dodecafluoroheptyl acrylate, and trifluorooctyl methacrylate—grafted onto a hydrogen-containing poly(dimethylsiloxane) backbone. The structures of the fluorinated siloxane polymers were measured and confirmed by proton nuclear magnetic resonance and Fourier transform infrared spectroscopy. Then the polymers were used as surface modifiers of UV-curable commercial polyurethane (DR-U356) at different concentrations (1, 2, 3, 4, 5, and 10 wt %). Among three formulations of these fluorinated siloxane polymers modified with DR-U356, hydrophobic states (91°, 92°, and 98°) were obtained at low concentrations (1 wt %). The DR-U356 resin is only in the hydrophilic state at 59.41°. The fluorine and siloxane element contents were investigated by X-ray photoelectron spectroscopy and the results indicated that the fluorinated and siloxane elements were liable to migrate to the surface of resins. The results of the friction recovering assays showed that the recorded contact angles of the series of fluorinated siloxane resins were higher than the original values after the friction-annealing progressing.

A Novel Nanoimprint Lithography Thiol-ene Resist for Sub-70 nm Nanostructures

2020 ◽  
Vol 12 (6) ◽  
pp. 779-783
Author(s):  
Man Zhang ◽  
Liang-Ping Xia ◽  
Sui-Hu Dang ◽  
A-Xiu Cao ◽  
Qi-Ling Deng ◽  
...  
Keyword(s):  
Surface Energy ◽  
Nanoimprint Lithography ◽  
Surface Oxygen ◽  
High Chemical ◽  
Uv Curable ◽  
Oxygen Inhibition ◽  
Click Polymerization ◽  
Low Viscosity ◽  
Low Surface Energy ◽  
Chemical Etch

In this paper, we propose a novel kind of UV click-polymerization thiol-ene copolymers as nanoimprint lithography resists for sub-70 nm resolution patterns. High-precision mold imprint and release are two of the most critical steps of nanoimprint lithography, which requires the resists with properties of excellent conformal replication and low surface energy. Conventional UV-curable resists used in nanoimprint lithography, such as acrylate, epoxy resin, and vinyl ether, cannot satisfy all these properties requirements because they exhibit surface oxygen inhibition during polymerization, or materials fracture and delamination during mold releasing. A novel kind of thiol-ene copolymers have been investigated in this study, which have many properties favorable for use as nanoimprint lithography resists to imprint sub-70 nm and high-aspect-ratio nanostructures. These properties include sufficiently low viscosity and high Young's modulus, low surface energy for easy demolding, polymerization in benign ambient, and in particular, high chemical-etch resistance. These excellent properties give improve nanoimprinting results.

The Polymerization and Performance of Fluorinated Acrylic Copolymer with Low Surface Energy

2011 ◽  
Vol 687 ◽  
pp. 562-566
Author(s):  
Yan Zhang ◽  
Zhan Ping Zhang ◽  
Yu Hong Qi ◽  
Xin Rui Gao
Keyword(s):  
Surface Energy ◽  
Monomer Conversion ◽  
Ethyl Acrylate ◽  
Carbon Chain ◽  
Solid Content ◽  
Coating Materials ◽  
Water Contact ◽  
Acrylic Copolymer ◽  
Low Surface Energy ◽  
And Performance

Fluoro-polymer is of great importance as coating materials because of their excellent resistance to high temperature, chemicals and organic solvents. In the interest of researching low surface energy coating, a kind of copolymer was prepared by solution polymerization method, using methyl methacrylate, butyl acrylate, 2-hydroxyethyl acrylate and perfluoroalkyl ethyl acrylate whose length of fluorinated carbon chain was from 6 to12. Solid content, monomer conversion rate and viscosity of the copolymer were measured. Parallel experiments were separately carried out with different contents of initiator and fluorinated monomer. The results showed that the water contact angle of the film becomes bigger with the increase of the content of fluorinated monomer, with the biggest value in 108° when the content of fluorinated monomer content is 30 wt%, but only changing little after content of fluorinated monomer reaches up 15 wt%. The results indicated that the copolymer can offer the best property combination when the contents of fluorinated monomer and initiator were 15 wt% and 1.8 wt%.

scholarly journals Influence of Hydrophobic Coating on Freeze-Thaw Cycle Resistance of Cement Mortar

2019 ◽  
Vol 2019 ◽  
pp. 1-12
Author(s):  
Zijian Song ◽  
Zhongyuan Lu ◽  
Zhenyu Lai
Keyword(s):  
Surface Energy ◽  
Chemical Modification ◽  
Cement Mortar ◽  
Mass Loss Rate ◽  
Water Contact ◽  
Freeze Thaw ◽  
Hydrophobic Coating ◽  
Low Surface Energy ◽  
Thaw Cycle ◽  
Cement Based Materials

Due to the porous characteristics of cement-based materials, they are often corroded by salt solutions, which results in decreased durability, especially against damage under freeze-thaw cycles (FTCs). Improving surface properties is an effective way to improve the durability of these materials. In this study, a hydrophobic coating was applied to the surface of cement mortar by chemical modification of low surface energy materials. Fourier transform infrared spectroscopy (FT-IR) showed that low surface energy substances are linked to hydration products through chemical bonds. A water contact angle test indicates that the surface of cement mortar changed from hydrophilic (θ = 14°) to hydrophobic (θ = 140°) after chemical modification. The cumulative water uptake of hydrophobic samples decreased by 90%. Meanwhile, the wear resistance of the hydrophobic coatings was excellent. Compared with the baseline sample, mass loss rate, flexural strength, and compressive strength of hydrophobic coating samples increased several-fold in the FTC test. Microstructural changes of the mortar were characterized by scanning electron microscopy. The results show that a hydrophobic coating can significantly improve the freeze-thaw resistance of cement-based materials. The formation of a hydrophobic layer on the surface of cement-based materials can improve their durability. The research results not only have applications in civil engineering but will also have great impact in the restoration of historic structures.

Preparation and Characterization of Waterborne Fluorinated Polyurethane-Acrylate

2017 ◽  
Vol 753 ◽  
pp. 60-64
Author(s):  
Wei Yang ◽  
Ming Jian Song ◽  
Bin Xie ◽  
Yue Jing Zhou
Keyword(s):  
Contact Angle ◽  
Phase Separation ◽  
Water Contact Angle ◽  
Film Surface ◽  
Surface Hydrophobicity ◽  
Toluene Diisocyanate ◽  
Water Contact ◽  
Obvious Effect ◽  
Fluorinated Polyurethane ◽  
Polyurethane Acrylate

Fluorinated urethane-acrylic monomer (FUA) was synthesized using toluene diisocyanate (TDI), 1H, 1H, 2H, 2H-Perfluorooctanol(FOH) as well as hydroxyethyl methacrylate(HEMA), and then applied to prepare waterborne fluorinated polyurethane-acrylate (FPUA) via emulsion polymerization. The effect of FUA content on surface properties of latex films was evaluated by means of nuclear magnetic resonance (1H NMR), atomic force microscope (AFM) and water contact angle test. It is shown that FUA monomer content is related to phase separation of the film surface and water contact angle. As FUA content was increased from 0 wt% to 11.8 wt%, water contact angle was increased from 84° to 104.5°. Further increase of FUA has little influence on surface hydrophobicity but obvious effect on surface phase separation, and the reason which led to this phenomenon is described.

Study on Fluorocarbon Antifouling Coatings with Low Surface Energy

2011 ◽  
Vol 689 ◽  
pp. 445-449
Author(s):  
Chun Hong Qiu ◽  
Yu Hong Qi ◽  
Zhan Ping Zhang ◽  
Hui Gao
Keyword(s):  
Contact Angle ◽  
Surface Energy ◽  
Water Contact Angle ◽  
Dynamic Testing ◽  
Marine Diatom ◽  
Silicone Resin ◽  
Water Contact ◽  
Antifouling Coating ◽  
Low Surface Energy ◽  
Antifouling Coatings

To develop non-toxic marine antifouling coating, a series of antifouling coatings were prepared based on fluorocarbon copolymer. Based on the measurement of roughness and water contact angle, the attachment test of marine diatom and bacteria before and after dynamic testing in seawater, it has been investigated that the influence of three functional fillings and silicone resin on the performance of the antifouling coatings with low surface energy. The erosion rate of the coatings was measured by the samples rotated 72h at the 12 knots of simulating sailing speed. The results showed that the roughness of coatings changes from 0.2um to 3um, it does influenced slightly by the rotating test. Water contact angle of all coatings is about 100° before rotating test. It decreases to about 70° after the rotating test in seawater. Due to the increase of surface energy of the coatings, both the amount of diatom and bacteria on samples increases after rotating test in seawater.

Fabrication of Sub-Wavelength Antireflective Structures Using a Soft Roll-to-Plate Nanoimprinting Lithographic Method

2015 ◽  
Vol 1118 ◽  
pp. 3-8 ◽  
Author(s):  
Yun Zhou ◽  
Su Shen ◽  
Jie Zhang ◽  
Peng Fei Jin ◽  
Yan Hua Liu
Keyword(s):  
High Resolution ◽  
Surface Energy ◽  
Process Time ◽  
Plastic Film ◽  
Polyurethane Acrylate ◽  
Low Surface Energy ◽  
Chemical Inertness ◽  
Short Period ◽  
Flexible Mold ◽  
Sub Wavelength

Sub-wavelength antireflective structures are fabricated by using a soft roll-to-plate nanoimprinting lithography. The proposed methodology employs a modified polyurethane acrylate as a flexible mold due to its high resolution, chemical inertness, polymerization characteristics, and its non-wetting, very low surface energy. Large-format (750mm x 750mm) plastic film with the recombined double-sided sub-wavelength structures is obtained, which has fascinating broadband antireflective effect. The roll-to-plate ultra-voilet nanoimprinting provides the capability of patterning sub-100nm structures, a short period of process time and allows the fabrication of sub-wavelength structure on a large number of flexible or rigid substrates in an economic fashion.

Development of non-fluorine superhydrophobic textiles using polypropylene resins

2019 ◽  
Vol 89 (19-20) ◽  
pp. 4015-4027 ◽  
Author(s):  
Jung Yoon Kim ◽  
Changsang Yun ◽  
Chung Hee Park
Keyword(s):  
Contact Angle ◽  
Surface Energy ◽  
Water Contact Angle ◽  
Vapor Permeability ◽  
Mixing Ratio ◽  
Water Contact ◽  
Environmental Friendliness ◽  
Drying Temperature ◽  
Low Surface Energy ◽  
Develop Environment

This study aims to develop environment-friendly superhydrophobic textiles forming nanoparticles of polypropylene that have intrinsically low surface energy, and thus achieving the requirements for superhydrophobicity, such as hierarchical roughness and low surface energy at once. This work mainly studies the influences of tacticity (isotactic, atactic), concentration (10, 20, 30 and 40 mg/ml), drying temperature (30℃ and 70℃) and the mixing ratio of the solvent/non-solvent (9:1, 8:2, 7:3 and 6:4) on the coating morphology and wettability. In the case of isotactic polypropylene, the optimal condition showing the water contact angle of 173° and the water shedding angle of 4° was at 70℃ drying temperature, 30 mg/ml concentration and 6:4 solvent/non-solvent mixing ratio. Amorphous polypropylene showed the water contact angle of 163° and the water shedding angle of 9° at the condition of 30℃ drying temperature, 40 mg/ml concentration and 8:2 solvent/non-solvent mixing ratio. It was revealed that superhydrophobicity by amorphous polypropylene was exhibited at lower drying temperature and lower mixing ratio for the non-solvent. This is attributed to the different evaporation temperature or speed of the solvent/non-solvent mixing according to the tacticity of polypropylene. This study demonstrated that environmental-friendliness was improved in that superhydrophobic textiles were developed without fluorine compounds, maintaining vapor permeability. This study also developed a finishing method using amorphous polypropylene under a mild condition in terms of drying temperature and solvent toxicity, which is expected to be applicable not only to polyester but also to various fabrics.

Synthesis and Properties of Polyurethane Modified with Hydroxyl Terminated Polysiloxane

2011 ◽  
Vol 335-336 ◽  
pp. 881-885 ◽  
Author(s):  
Jun Ling Tian ◽  
You Ming Cao ◽  
Xiao Tao Zhou
Keyword(s):  
Shear Strength ◽  
Water Resistance ◽  
Energy Surface ◽  
Surface Hydrophobicity ◽  
Absorption Properties ◽  
Water Contact ◽  
Block Polymers ◽  
Low Surface Energy ◽  
Surface Contact Angle ◽  
Scanning Electron

A series of silicone modified polyurethane(Si-PU) block polymers were synthesized from using polybutylene adipate (PBA), methane-4-4’-diisocyanate(MDI), 1,4–butanediol(BDO) and hydroxyl terminated polysiloxane(HO-PDMS). The effect of synthesis condition on the shear strength was investigated. The influnce of the content of HO-PDMS on the absorption properties of PU was tested. The structure of the synthetic products was characterized by Infrared Spectrum, the surface hydrophobicity was examined by surface contact angle and the scanning electron microscopy(SEM), respectively. The results showed that the silicone chain segments were incorporated into PU macromolecule. The shear strength firstly decreased slightly and then decressed greatly with increasing the HO-PDMS content. But the modified polyurethane had low surface energy, surface water contact was improved by 25°C, and the water resistance was also improved.

Sign in / Sign up

Export Citation Format

Share Document