Transparent and Hard Siloxane Based Hybrid UV-Curable Coating Materials with Amphiphobic Properties

2021 ◽  
Vol 21 (8) ◽  
pp. 4450-4456
Author(s):  
Keuk-Min Jeong ◽  
Sung Soo Park ◽  
Saravanan Nagappan ◽  
Heekyung Jin ◽  
Guoquan Min ◽  
...  
Keyword(s):  
Contact Angle ◽  
Ethyl Ether ◽  
High Hardness ◽  
Hybrid Coating ◽  
Static Contact Angle ◽  
Coating Films ◽  
Coating Materials ◽  
Pencil Hardness ◽  
Uv Curable ◽  
Static Contact

In this study, highly transparent siloxane-based hybrid UV-curable coating materials were prepared using (acryloxypropyl)methylsiloxane monomer (APMS), a thiol-ene monomer, with benzoin ethyl ether. For the thiol-ene monomer, either pentaerythritol tetrakis(3-mercaptopropionate) (PETTMP) or trimethylolpropane tris(3-mercaptopropionate) (TMPTMP) was used. The siloxane-based hybrid coating materials were highly transparent and hard (pencil hardness of 6–7H). The materials were also amphiphobic, with a water static contact angle of 92–100° and an oil contact angle of 46–63°, when prepared with a high siloxane-monomer-to-PETTMP/TMPTMP ratio. In general, both hybrid coating materials exhibited improved oleophobicity, high hardness, and surface smoothness with increasing siloxane content, although the TMPTMP-based hybrid coating films exhibited slightly higher oleophobicity (lower hydrophobicity) and a smoother surface than the PETTMP-based hybrid coating films.

scholarly journals Precise Static Contact Angle Measurements Using Pythagolas Rule

2014 ◽  
Vol 15 (2) ◽  
pp. 57-62
Author(s):  
Jin-Yeong Choi ◽  
Dong-Jun Kwon ◽  
Zuo-Jia Wang ◽  
Pyeong-Su Shin ◽  
Joung-Man Park
Keyword(s):  
Contact Angle ◽  
Static Contact Angle ◽  
Angle Measurements ◽  
Static Contact ◽  
Contact Angle Measurements

scholarly journals Numerical Study of Formation of a Series of Bubbles from an Orifice by Applying Dynamic Contact Angle Model

2020 ◽  
Vol 2020 ◽  
pp. 1-17
Author(s):  
Nan Chen ◽  
Xiyu Chen ◽  
Antonio Delgado
Keyword(s):  
Contact Angle ◽  
Gas Flow ◽  
Dynamic Contact Angle ◽  
Dynamic Contact ◽  
Static Contact Angle ◽  
Bubble Shape ◽  
Flow Rates ◽  
Bubble Detachment ◽  
Static Contact ◽  
Detachment Time

The dynamic contact angle model is applied in the formation process of a series of bubbles from Period-I regime to Period-II regime by using the VOF method on a 2D axisymmetric domain. In the first process of the current research, the dynamic contact angle model is validated by comparing the numerical results to the experimental data. Good agreement in terms of bubble shape and bubble detachment time is observed from a lower flow rate Q = 150.8 cm3/min (Re = 54.77, Period-I regime) to a higher flow rate Q = 603.2 cm3/min (Re = 219.07, Period-III regime). The comparison between the dynamic contact angle model and the static contact angle model is also performed. It is observed that the static contact angle model can obtain similar results as the dynamic contact angle model only for smaller gas flow rates (Q ≤ 150.8 cm3/min and Re ≤ 54.77)). For higher gas flow rates, the static contact angle model cannot produce good results as the dynamic contact angle model and has larger relative errors in terms of bubble detachment time and bubble shape.

Nano-Silica Reinforced UV-Curable Hybrid Hard Coatings on Polymethylmethacrylate (PMMA) Substrate

2012 ◽  
Vol 557-559 ◽  
pp. 1797-1802
Author(s):  
Xiao Ying Sun ◽  
Jianan Wang ◽  
Jian Zhong Hang ◽  
Lu Jiang Jin ◽  
Li Yi Shi
Keyword(s):  
Colloidal Silica ◽  
Silica Content ◽  
Hard Coatings ◽  
Hybrid Coatings ◽  
Pmma Substrate ◽  
Coating Films ◽  
Pencil Hardness ◽  
Uv Curable ◽  
Silica Suspension ◽  
Inorganic Components

Hybrid sols were synthesized through a combination of hydrolysis and condensation reactions of tetraetoxysilane and γ-Methacryloxypropyltrimethoxysilane together with the addition of a colloidal silica suspension. A transparent, hard UV-curable hybrid coatings based on hybrid sols were prepared in order to improve the scratch and abrasion resistance of PMMA substrate. The effects of the content of colloidal silica suspension on pencil hardness, transmittance, and haze were investigated. The pencil hardness of all coating films in this study can be tuned from 4H to 9H, whereas that of uncoated PMMA substrate is 1H. The higher hardness of the coatings can be attributed to the dense structure induced by the increase of network density with the addition of colloidal silica suspension. Furthermore, it is found that the transmittance of coatings slightly fluctuates between 91.8% and 93.6% with increasing colloidal silica content. These results indicate the good compatibility of the organic and inorganic components.

scholarly journals Specific ion modulated thermoresponse of poly(N-isopropylacrylamide) brushes

2016 ◽  
Vol 18 (8) ◽  
pp. 6037-6046 ◽  
Author(s):  
Ben A. Humphreys ◽  
Joshua D. Willott ◽  
Timothy J. Murdoch ◽  
Grant B. Webber ◽  
Erica J. Wanless
Keyword(s):  
Contact Angle ◽  
Static Contact Angle ◽  
Angle Measurements ◽  
Static Contact ◽  
Contact Angle Measurements

Specific anion identity and concentration dictates the direction and magnitude of the shift in LCST for a pNIPAM brush determined by in situ ellipsometry, QCM-D and static contact angle measurements.

Research on the Prediction of Static Contact Angle in Circular Capillary Tubes

2012 ◽  
Vol 161 ◽  
pp. 21-25
Author(s):  
Jun Biao Wang ◽  
Dong Zi Zeng ◽  
Jian Jun Jiang
Keyword(s):  
Contact Angle ◽  
Height Function ◽  
Static Contact Angle ◽  
Liquid Volume ◽  
Capillary Tubes ◽  
Partial Wetting ◽  
Static Contact ◽  
Glass Tubes ◽  
Circular Capillary ◽  
New Discovery

New discovery was found by the capillary experiments with circular glass tubes and partial-wetting liquids that the partial liquid volume under moon surface could be expressed by equivalent height function H(r). Contact angle models suggested in this work, evaluated by Eq. 5, was eventually given by the concept of equivalent height, and so-determined models presented a much higher accuracy on prediction of contact angle compared to Jurin formula.

Smooth and Transparent Films Showing Paradoxical Surface Properties: The Lower the Static Contact Angle, the Better the Water Sliding Performance

Langmuir ◽  
2019 ◽  
Vol 35 (21) ◽  
pp. 6822-6829
Author(s):  
Sohei Kaneko ◽  
Chihiro Urata ◽  
Tomoya Sato ◽  
Roland Hönes ◽  
Atsushi Hozumi
Keyword(s):  
Contact Angle ◽  
Surface Properties ◽  
Static Contact Angle ◽  
Transparent Films ◽  
Static Contact
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