Surface Degradation of Silicone Rubber Exposed to Corona Discharge

Zhu, Yong; Haji, K.; Otsubo, Masahisa; Honda, C.

doi:10.1109/tps.2006.876498

Cited by 63 publications

(31 citation statements)

References 10 publications

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“…On the corona-aged specimens, the absorption due to C --O bonds (carbonyl groups) occurring at a wave number at [20,30,36] is a characteristic for the oxidation of SAN sample [37]. This is in line with the EDX results (Section 3.3) showing an increase in the oxygen ratio in the aged specimen surface.…”

Section: Ftir Analysissupporting

confidence: 81%

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Surface degradation of styrene acrylonitrile exposed to corona discharge

Handala

Lamrous

2007

Int Trans Elec Energy Syst

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SUMMARYAn experimental investigation of the degradation of styrene acrylonitrile (SAN) exposed to corona discharge under ambient conditions was presented. SAN specimens were subjected to a corona stress generated by two plane parallel electrodes. The surface physicochemical changes were studied using scanning electron microscope, energy-dispersive X-ray analysis, Fourier transformed infrared spectroscopy and surface resistance measurements.The results showed significant damage on the specimen' surface caused by the corona discharge. Surface erosion was seen in the micrographs and colour change was observed on the aged surface.The surface resistance dropped rapidly during the first hours of exposure to the corona discharge, then approached a saturation value asymptotically. It was established that hydrophilic hydroxyl (O-H) and carbonyl (C --O) groups have formed on the surface of the aged sample. Moisture adsorbed by the hydrophilic OH groups plays an important role in the decrease of the surface resistance, as, under dry conditions after removal from the corona discharge, the surface resistance increased and tended to recover its original value.

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Section: Ftir Analysissupporting

confidence: 81%

“…Figure 1 (d) shows a wider ring and the damage caused by flashover. During the test, some moisture was observed on the surfaces of the sample and the high voltage electrode [20]. …”

Section: Visual Observationsmentioning

confidence: 99%

Surface degradation of styrene acrylonitrile exposed to corona discharge

Handala

Lamrous

2007

Int Trans Elec Energy Syst

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“…In spite of these there are reports from all over the world regarding the degradation of silicone rubbers [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19], in various environments for its main structural modifications seen in damaged structure are changes in molecular weight distribution (due to main-chain scission, crosslinking, and end-linking) and production of volatile degradation product. Zhu, et al [6] studied the surface degradation of silicone rubber exposed to corona discharge.…”

Section: Introductionmentioning

confidence: 99%

“…Zhu, et al [6] studied the surface degradation of silicone rubber exposed to corona discharge. Gustavsson,et al [14] reported the results of aging of silicone rubber under ac or dc voltages in a coastal environment.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Damaged Silicon Rubber Hose

Nahar¹,

Zhang²

2011

AJAC

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Recently, there have been many reports of silicon rubber (SR) hoses becoming brittle in juice factory within one month of purchase. The damage is a new phenomenon, and its cause is unknown. We have collected the damaged hoses attached to UHT sterilizer (ultra-high-temperature) in juice factory and examined them for chemical changes. In addition, we have analyzed the hose-washing chemicals (NaOH and HNO 3 ) that used in juice factory and investigated the effect of NaOH and HNO 3 on a new hose surface in an attempt to establish a probable chemical chain reaction that could attack of the Si-O-Si backbone and cause such degradation. According to WDXRF (Wavelength Dispersive X-Ray Fluorescence), CHNS (Carbon Hydrogen Nitrogen and Sulfur) elemental analysis and FE-SEM photo mapping (Field Emission Scanning Electron Microscope) results, the amount of silicon (Si) and the oxygen (O) concentration were much lower in the damaged hoses than in new SR hose ones. These findings reveal that oxygen-containing silicon-based backbone may leach out from the hose by washing chemicals. As a result, the hoses became brittle after one month of use in juice factory. EDS (Energy-Dispersive-Spectroscopy) peak shows that low concentration of sodium was inserted into the damaged hose surface, due to hose cleaning by NaOH. UV-Vis Spectrometer was used to detect the Si from hose washing chemicals. It was found that the elemental composition of the damaged SR hose changed significantly and both the pH of washing chemicals (NaOH and HNO 3 ) and the exposure UTH temperature have direct effect on the brittleness of the silicon hose in juice factory.

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“…Y algo similar ocurre al utilizar la formamida con valores de ángulo de contacto de 56,7º a 58,4º para velocidades de paso de 5 y 20 m/min respectivamente. (Zhu, Haji et al 2006 a) Estos valores medidos sobre las muestras de film de LDPE tratado con plasma corona a baja potencia, 200 W, ponen de manifiesto que la velocidad de paso del film a través de los electrodos de descarga del plasma tiene muy poca influencia sobre la humectabilidad del film polimérico. Las pequeñas variaciones observadas indican que para bajas potencias de trabajo del tratamiento de plasma corona, el factor velocidad de paso no es decisivo respecto a la mejora de la humectabilidad del film de LDPE, cuantificada por los valores de ángulo de contacto para los cuatro líquidos de ensayo utilizados.…”

Section: Conclusiones Parcialesunclassified

Investigación sobre la mejora de la humectabilidad de films poliméricos de polietileno de baja densidad (LDPE) mediante plasma por descarga corona. Optimización de laminados con espumas de polietileno mediante procesos de laminación con adhesivos Hot-Melt para aplicaciones técnicas en el sector de automoción

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Surface Degradation of Silicone Rubber Exposed to Corona Discharge

Cited by 63 publications

References 10 publications

Surface degradation of styrene acrylonitrile exposed to corona discharge

Surface degradation of styrene acrylonitrile exposed to corona discharge

Analysis of Damaged Silicon Rubber Hose

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