Effect of UV Radiation on HTV-Silicon Rubber under Different Humidity

2014 ◽  
Vol 986-987 ◽  
pp. 55-58
Author(s):  
Chun Fang Yi ◽  
Qian Shi ◽  
Pei Song Liang
Keyword(s):  
Contact Angle ◽  
Uv Radiation ◽  
Silicone Rubber ◽  
Hardness Test ◽  
Static Contact Angle ◽  
Rubber Material ◽  
Silicon Rubber ◽  
Static Contact ◽  
Aging Properties ◽  
Ultraviolet Aging

Along with our country " west-east electricity transmission " project and UHV projects,HTV-silicon rubber has been more and more widely used in the western regions of China,such as xining, Lhasa, hami and other regions, has strong solar radiation, long sunshine time, but the region environment humidity conditions are different. Therefore, it is necessary to study the Effect of UV Radiation on HTV-Silicon Rubber under different humidity. In this paper, the extraction of relative humidity variable, under different humidity conditions,HTV silicone rubber material taken for artificial ultraviolet aging experiment, to explore under different humidity conditions,HTV silicone rubber material’s ultraviolet aging properties. Experimental samples of artificial ultraviolet aging experiment taken in static contact angle test, hardness test, fourier transform infrared spectroscopy (FTIR) analysis, then integrate the test data and make theoretical analysis.The experimental results show that both samples hardness are larger, the flexibility are reduced; their both surface static contact angle are decreased, the hydrophobic are part of the loss; their both surface roughness are bigger,and a part of filler is leaked; FTIR of peak area of Si-CH3 and Si-O-Si keys absorption peak are reduced, shows a portion of the Si-CH3 and Si-O-Si keys is interrupted into free radicals; UV radiation has a certain influnce on HTV silicone rubber.Humidity variable has two contray sides influence on ultraviolet aging characteristics of HTV silicone rubber material,its process is complicated.

Effect of UV Radiation on Different Voltage Grade of HTV-Silicon Rubber in Dry Conditions Performance

2013 ◽  
Vol 385-386 ◽  
pp. 11-15 ◽  
Author(s):  
Yun Peng Liu ◽  
Qian Shi ◽  
Ying Liang
Keyword(s):  
Contact Angle ◽  
Uv Radiation ◽  
Accelerated Aging ◽  
Static Contact Angle ◽  
Uv Aging ◽  
Silicon Rubber ◽  
Static Contact ◽  
Aging Resistance ◽  
Dry Conditions ◽  
Climatic Characteristics

Along with our country " west-east electricity transmission " project and UHV projects, HTV-silicon rubber with superior properities has been more and more widely used in the western regions of China.The paper focus on hami to zhengzhou ±800kV UHV DC transmission project which in hami HTV-silicon rubber insulators aging problems, extract dry and the strong UV radiation climatic characteristics of the hami area to quantify, in the dry environment we conduct UHV levels of HTV-silicon rubber materials and normal voltage levels of HTV-silicon rubber materials on UV accelerated aging experiment.And the tests of hardness,static contact angle and Fourior transform infrared spectroscopy ( FTIR) are performed for the samples. The experimental results show that both samples hardness are larger, the flexibility are reduced; their both surface static contact angle are decreased, the hydrophobic are part of the loss; their both surface roughness are bigger,and a part of filler is leaked; FTIR of peak area of Si-CH3 and Si-O-Si keys absorption peak are reduced, shows a portion of the Si-CH3 and Si-O-Si keys is interrupted into free radicals; under the condition of the initial data of the two kinds of samples are similar , the variation of UHV levels of each data sample is lower than it of normal levels of samples. This is due to the UHV grade of HTV-silicon rubber materials on the formulation and manufacturing process are optimized, in the dry environment the UV aging resistance of UHV levels of HTV-silicon rubber materials is superior to it of ordinary voltage grade of HTV-silicon rubber materials.

Change of Hydrophobicity on Silicone Rubber Modified by CF4 Capacitively Coupled Plasma and Inductively Coupled Plasma

2008 ◽  
Vol 373-374 ◽  
pp. 350-353 ◽  
Author(s):  
S.H. Gao ◽  
Y. Liu ◽  
M.K. Lei ◽  
Li Shi Wen
Keyword(s):  
Contact Angle ◽  
Silicone Rubber ◽  
Inductively Coupled Plasma ◽  
Treatment Time ◽  
Static Contact Angle ◽  
Rf Plasma ◽  
Capacitively Coupled ◽  
Inductively Coupled ◽  
Static Contact ◽  
Capacitively Coupled Plasma

Silicone rubber (SIR) samples are exposed to CF4 capacitively coupled plasma (CCP) and inductively coupled plasma (ICP) at radio frequency (RF) power of 60–200 W for a treatment time up to 20 min, respectively. Static contact angle is employed to estimate the change of hydrophobicity of the silicone rubber modified by the two coupled types of CF4 RF plasma. A milder enlargement of static contact angle of SIR samples modified by ICP treatment is observed compared with that by CCP treatment. The hydrophobicity of the modified SIR surface by CCP treatment increases to a maximum, and further decreases toward the hydropholicity. The higher self-bias on the SIR samples being modified by CCP treatment than that by ICP treatment leads to the more dramatic physical and/or chemical reaction on the SIR surface, resulting in the competition between fluorination and ablation or etching.

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.

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.

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