The Experts below are selected from a list of 177 Experts worldwide ranked by ideXlab platform
M. Mercedes Pastor-blas - One of the best experts on this subject based on the ideXlab platform.
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Influence of Rubber Formulation on Surface Modifications Produced by RF Plasma
Plasma Chemistry and Plasma Processing, 2010Co-Authors: Ana B. Ortíz-magán, M. Mercedes Pastor-blasAbstract:The effectiveness of nitrogen, oxygen and air Radio Frequency (RF) plasma treatments on two styrene-butadiene vulcanized Rubbers with a different Formulation has been studied. The presence of an antiadherent surface layer containing low-molecular weight ingredients (sulfur-rich vulcanization agents and wax) from SW ( S ulfur- W ax) Rubber Formulation requires an extended plasma treatment capable of removing this surface layer. When the percentage of antiadherent moieties is reduced in ZS ( Z inc S tearate) Rubber Formulation, shorter plasma treatment times are enough to modify Rubber surface and increase its polarity by the creation of C–O and C=O polar groups that enhance adhesion towards a polyurethane adhesive. Air and oxygen plasma treatments are more aggressive than nitrogen plasma and therefore they are more effective in removing the antiadherent layer of the outermost Rubber surface layer prior to oxidation of the Rubber surface.
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Surface treatment of SBR Rubber with oxalic acid
1997Co-Authors: J. Iniesta-jaen, M. Mercedes Pastor-blas, Ana M. Torró-palau, José Miguel Martín-martínezAbstract:Oxalic acid (OA) solutions in butanone/alcohol mixtures were used as surface treatment of synthetic vulcanized serene-butadiene Rubber (SBR). Several experimental variables were considered (OA concentration, nature and amount of the alcohol in the solvent mixture, roughening of Rubber). The treatment with oxalic acid increases the T-peel strength of adhesive joints. The effectiveness of the surface treatment depends on the Rubber Formulation and is mainly due to the removal of antiadherent compounds on the Rubber surface.
Ana B. Ortíz-magán - One of the best experts on this subject based on the ideXlab platform.
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Influence of Rubber Formulation on Surface Modifications Produced by RF Plasma
Plasma Chemistry and Plasma Processing, 2010Co-Authors: Ana B. Ortíz-magán, M. Mercedes Pastor-blasAbstract:The effectiveness of nitrogen, oxygen and air Radio Frequency (RF) plasma treatments on two styrene-butadiene vulcanized Rubbers with a different Formulation has been studied. The presence of an antiadherent surface layer containing low-molecular weight ingredients (sulfur-rich vulcanization agents and wax) from SW ( S ulfur- W ax) Rubber Formulation requires an extended plasma treatment capable of removing this surface layer. When the percentage of antiadherent moieties is reduced in ZS ( Z inc S tearate) Rubber Formulation, shorter plasma treatment times are enough to modify Rubber surface and increase its polarity by the creation of C–O and C=O polar groups that enhance adhesion towards a polyurethane adhesive. Air and oxygen plasma treatments are more aggressive than nitrogen plasma and therefore they are more effective in removing the antiadherent layer of the outermost Rubber surface layer prior to oxidation of the Rubber surface.
Xin Zhen-xiang - One of the best experts on this subject based on the ideXlab platform.
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Application of partial least-squares regression in Rubber Formulation
China Rubber Industry, 2020Co-Authors: Xin Zhen-xiangAbstract:The limitation of applying the regression method to establish the second-degree poly-nomial models in order to investigate influencing factors and experiment data in Rubber Formulation was analyzed,then the technology of applying partial least-squares(PLS) regression method to establish the second-degree polynomial models was presented,and its application in Rubber Formulation was demonstrated by examples.The results showed that PLS regression method was applicable to the regression modeling analyses of more dependent variables to more independent variables,and the conclusion was more credible.
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Application of the Artifical Neural Network Based on the Uniform Design in the Study of Rubber Formulation
Journal of Qingdao University of Science and Technology, 2020Co-Authors: Xin Zhen-xiangAbstract:The uniform design method was employed in this paper to design the Formulations of natural Rubber vulcanization system,and the experimental data processing was adopted a hybrid artificial neural network(ANN)-genetic algorithm(GA) approach.The quantitative relations between the performance and influencing factors were gained in a few trials,and the the completed neural network was used to optimize the Formulation of Rubber.The predicted results was tested by experiments,and the results were good agreement with the predicted values.Besides,when the sulphr and accelerator loadings were 1 phr and 1.2 phr separately,the optimal curing formula,with shorter vulcanization time(TC90) and longer scorch time(TS2),was obtained.
L. E. Schmidt - One of the best experts on this subject based on the ideXlab platform.
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Hydrophobic stability of silicone Rubber after water immersion
Annual Report - Conference on Electrical Insulation and Dielectric Phenomena CEIDP, 2007Co-Authors: Henrik Hillborg, X. Kornmann, Andrej Krivda, P Meier, L. E. SchmidtAbstract:The hydrophobic stability of a virgin HTV silicone Rubber Formulation and corresponding Formulations after initial 'accelerated ageing' by water immersion during 410 h at 23 or 90°C has been compared. This is in order to investigate the influence of moisture/water ingress on the hydrophobic recovery after corona discharges and after deposition of artificial pollution layers. The 'aged' materials exhibited a slower hydrophobic recovery after exposure to corona discharges, but on the other hand they exhibited a faster hydrophobic transfer through artificial pollution layers. Scanning Electron Microscopy revealed a significant surface erosion, exposing individual filler particles; even though no significant surface oxidation was observed using X-ray Photoelectron Spectroscopy. Moreover, the extractable amounts of silicone oils were analyzed using chromatography. It was found that both the amount and the types of the extractable silicones were similar for both virgin and 'aged' materials. The observed differences in hydrophobic recovery rates were explained primarily by the difference in surface roughness between aged and virgin samples. Finally, it was concluded that cyclic silicone oligomers (D4 and D5) were responsible for the initial hydrophobic transfer effect through the artificial pollution layer. © 2007 IEEE.
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Hydrophobic stability of silicone Rubber after water immersion
2007 Annual Report - Conference on Electrical Insulation and Dielectric Phenomena, 2007Co-Authors: Henrik Hillborg, X. Kornmann, Andrej Krivda, P Meier, L. E. SchmidtAbstract:The hydrophobic stability of a virgin HTV silicone Rubber Formulation and corresponding Formulations after initial 'accelerated ageing' by water immersion during 410 h at 23 or 90degC has been compared. This is in order to investigate the influence of moisture/water ingress on the hydrophobic recovery after corona discharges and after deposition of artificial pollution layers. The 'aged' materials exhibited a slower hydrophobic recovery after exposure to corona discharges, but on the other hand they exhibited a faster hydrophobic transfer through artificial pollution layers. Scanning electron microscopy revealed a significant surface erosion, exposing individual filler particles; even though no significant surface oxidation was observed using X-ray photoelectron spectroscopy. Moreover, the extractable amounts of silicone oils were analyzed using chromatography. It was found that both the amount and the types of the extractable silicones were similar for both virgin and 'aged' materials. The observed differences in hydrophobic recovery rates were explained primarily by the difference in surface roughness between aged and virgin samples. Finally, it was concluded that cyclic silicone oligomers (D4 and D5) were responsible for the initial hydrophobic transfer effect through the artificial pollution layer.
Henrik Hillborg - One of the best experts on this subject based on the ideXlab platform.
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Silicone Rubber with improved hydrophobicity
Electrical Insulation and Dielectric Phenomena (CEIDP), 2015 IEEE Conference on, 2015Co-Authors: Hongjie Sun, Y.j. Wang, Jiansheng Chen, Henrik HillborgAbstract:In outdoor insulation, a hydrophobic surface is crucial for minimizing leakage currents during severe weather conditions and in polluted environments. Silicone Rubber is a commonly used insulation material with good hydrophobicity. However, the hydrophobicity may be temporarily reduced or even lost when silicone Rubber worked under extreme pollution events, but will gradually recover with time. The current work is aiming at developing a silicone Rubber Formulation with improved hydrophobicity, such as increased hydrophobic recovery rate. This was achieved by adding silicone-based additives. The loss and recovery of hydrophobicity of the materials after exposure to corona discharges, as well as the hydrophobic transfer ability, were assessed by contact angle measurements. In addition, an inclined plane tracking test was carried out according to IEC 60587. The modified silicone Rubber exhibited a more durable hydrophobicity during corona treatment and a faster recovery after end of exposure. The resistance to tracking and erosion behavior was maintained, compared to the reference materials. Unexpectedly, no improvement on the hydrophobicity transfer performance was noted.
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Hydrophobic stability of silicone Rubber after water immersion
Annual Report - Conference on Electrical Insulation and Dielectric Phenomena CEIDP, 2007Co-Authors: Henrik Hillborg, X. Kornmann, Andrej Krivda, P Meier, L. E. SchmidtAbstract:The hydrophobic stability of a virgin HTV silicone Rubber Formulation and corresponding Formulations after initial 'accelerated ageing' by water immersion during 410 h at 23 or 90°C has been compared. This is in order to investigate the influence of moisture/water ingress on the hydrophobic recovery after corona discharges and after deposition of artificial pollution layers. The 'aged' materials exhibited a slower hydrophobic recovery after exposure to corona discharges, but on the other hand they exhibited a faster hydrophobic transfer through artificial pollution layers. Scanning Electron Microscopy revealed a significant surface erosion, exposing individual filler particles; even though no significant surface oxidation was observed using X-ray Photoelectron Spectroscopy. Moreover, the extractable amounts of silicone oils were analyzed using chromatography. It was found that both the amount and the types of the extractable silicones were similar for both virgin and 'aged' materials. The observed differences in hydrophobic recovery rates were explained primarily by the difference in surface roughness between aged and virgin samples. Finally, it was concluded that cyclic silicone oligomers (D4 and D5) were responsible for the initial hydrophobic transfer effect through the artificial pollution layer. © 2007 IEEE.
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Hydrophobic stability of silicone Rubber after water immersion
2007 Annual Report - Conference on Electrical Insulation and Dielectric Phenomena, 2007Co-Authors: Henrik Hillborg, X. Kornmann, Andrej Krivda, P Meier, L. E. SchmidtAbstract:The hydrophobic stability of a virgin HTV silicone Rubber Formulation and corresponding Formulations after initial 'accelerated ageing' by water immersion during 410 h at 23 or 90degC has been compared. This is in order to investigate the influence of moisture/water ingress on the hydrophobic recovery after corona discharges and after deposition of artificial pollution layers. The 'aged' materials exhibited a slower hydrophobic recovery after exposure to corona discharges, but on the other hand they exhibited a faster hydrophobic transfer through artificial pollution layers. Scanning electron microscopy revealed a significant surface erosion, exposing individual filler particles; even though no significant surface oxidation was observed using X-ray photoelectron spectroscopy. Moreover, the extractable amounts of silicone oils were analyzed using chromatography. It was found that both the amount and the types of the extractable silicones were similar for both virgin and 'aged' materials. The observed differences in hydrophobic recovery rates were explained primarily by the difference in surface roughness between aged and virgin samples. Finally, it was concluded that cyclic silicone oligomers (D4 and D5) were responsible for the initial hydrophobic transfer effect through the artificial pollution layer.
