The Experts below are selected from a list of 108801 Experts worldwide ranked by ideXlab platform
Richard A Horrocks - One of the best experts on this subject based on the ideXlab platform.
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studies on the effect of different levels of toughener and flame retardants on thermal stability of epoxy resin
Polymer Degradation and Stability, 2010Co-Authors: Baljinder K Kandola, Bhaskar Biswas, D Price, Richard A HorrocksAbstract:A thermoplastic toughener, polyether sulphone (PES) and a number of different types of flame retardants were blended in different ratios with a commercial epoxy resin triglycidyl-p-aminophenol (TGAP) and 4,4-diamino diphenyl sulphone (DDS) a curing agent. The effect of type and levels of flame retardants (FR) and the toughening agent on the curing, thermal Decomposition and char oxidation behaviour of the epoxy resin was studied by the simultaneous differential thermal analysis and thermogravimetric techniques. It was observed that the toughener slightly increases the curing Temperature (by up to 20 °C) but had minimal effect on the Decomposition Temperature of the resin. Flame retardants, however affected all stages depending upon the type of flame retardant used. The curing peak for samples containing tougher and flame retardants although slightly changed depending upon the type of FR, was not more than ± 20 °C compared to that of samples containing toughener only. All flame retardants lowered the Decomposition Temperature of the epoxy resin. Phosphorus- and nitrogen-containing flame retardants reduced the char oxidation leading to more residual char, whereas halogen- containing flame retardants had less effect on this stage.
Yingling Liu - One of the best experts on this subject based on the ideXlab platform.
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thermal stability of epoxy silica hybrid materials by thermogravimetric analysis
Thermochimica Acta, 2004Co-Authors: Yingling Liu, Wenlung Wei, Kehying HsuAbstract:Abstract The thermal degradation behavior and thermal stability of epoxy-silica nanocomposites were studied with thermogravimetric analysis (TGA). Detailed and precise factors on the thermal stability based on the initial Decomposition Temperature (IDT), Temperature of maximum rate of weight loss ( T max ), integral procedure Decomposition Temperature (IPDT), Decomposition Temperature range, and activation energy ( E a ) of the Decomposition reactions were studied. Introduction of nanoscale silica into epoxy resins certainly improved their thermal stability and reduced their weight loss rates, and the improvement can be further enhanced with using a phosphorous compound as the curing agent. The activation energies of the thermal degradation reactions of the nanocomposites were calculated from various methods, and the results from the Ozawa method provided reliable data. It was shown that the presence of nanoscale silica leveled up the values of the activation energies of the degradation reactions, and phosphorus group depressed the values of E a .
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thermal stability of epoxy resins containing flame retardant components an evaluation with thermogravimetric analysis
Polymer Degradation and Stability, 2002Co-Authors: Yingling Liu, Yie Chan Chiu, Yie Shun ChiuAbstract:The thermal properties of epoxy resins containing flame retardants based on silicon, phosphorus, and melamine, were investigated with thermogravimetric analysis (TGA). The weight loss behaviour (including the weight loss Temperatures, weight loss rates, and the activation energy for each weight loss stage) and the thermal stability (including the initial Decomposition Temperature and integral procedure Decomposition Temperature) were characterized. Phosphorus groups lowered the epoxy resins' initial Decomposition Temperature, and silicon and melamine groups did not. The integral procedure Decomposition Temperatures of the epoxy resins were significantly increased with simultaneous incorporation of phosphorus and silicon, owing to the formation of highly anti-oxidant and thermally stable char. Incorporating melamine groups into the silicon-containing epoxy resins did not seriously alter the resins' thermal stability and degradation characteristics.
Yie Shun Chiu - One of the best experts on this subject based on the ideXlab platform.
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thermal stability of epoxy resins containing flame retardant components an evaluation with thermogravimetric analysis
Polymer Degradation and Stability, 2002Co-Authors: Yingling Liu, Yie Chan Chiu, Yie Shun ChiuAbstract:The thermal properties of epoxy resins containing flame retardants based on silicon, phosphorus, and melamine, were investigated with thermogravimetric analysis (TGA). The weight loss behaviour (including the weight loss Temperatures, weight loss rates, and the activation energy for each weight loss stage) and the thermal stability (including the initial Decomposition Temperature and integral procedure Decomposition Temperature) were characterized. Phosphorus groups lowered the epoxy resins' initial Decomposition Temperature, and silicon and melamine groups did not. The integral procedure Decomposition Temperatures of the epoxy resins were significantly increased with simultaneous incorporation of phosphorus and silicon, owing to the formation of highly anti-oxidant and thermally stable char. Incorporating melamine groups into the silicon-containing epoxy resins did not seriously alter the resins' thermal stability and degradation characteristics.
Baljinder K Kandola - One of the best experts on this subject based on the ideXlab platform.
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studies on the effect of different levels of toughener and flame retardants on thermal stability of epoxy resin
Polymer Degradation and Stability, 2010Co-Authors: Baljinder K Kandola, Bhaskar Biswas, D Price, Richard A HorrocksAbstract:A thermoplastic toughener, polyether sulphone (PES) and a number of different types of flame retardants were blended in different ratios with a commercial epoxy resin triglycidyl-p-aminophenol (TGAP) and 4,4-diamino diphenyl sulphone (DDS) a curing agent. The effect of type and levels of flame retardants (FR) and the toughening agent on the curing, thermal Decomposition and char oxidation behaviour of the epoxy resin was studied by the simultaneous differential thermal analysis and thermogravimetric techniques. It was observed that the toughener slightly increases the curing Temperature (by up to 20 °C) but had minimal effect on the Decomposition Temperature of the resin. Flame retardants, however affected all stages depending upon the type of flame retardant used. The curing peak for samples containing tougher and flame retardants although slightly changed depending upon the type of FR, was not more than ± 20 °C compared to that of samples containing toughener only. All flame retardants lowered the Decomposition Temperature of the epoxy resin. Phosphorus- and nitrogen-containing flame retardants reduced the char oxidation leading to more residual char, whereas halogen- containing flame retardants had less effect on this stage.
Wiesław Rudź - One of the best experts on this subject based on the ideXlab platform.
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linear polythioesters xxi products of interfacial polycondensation of bis 4 mercaptophenyl sulphone with some aliphatic and isomeric phthaloyl dichlorides
European Polymer Journal, 1993Co-Authors: Wawrzyniec Podkościelny, Wiesław RudźAbstract:Abstract New polythioesters were obtained by interfacial polycondensation of bis(4-mercaptophenyl)sulphone with some aliphatic and isomeric phthaloyl dichlorides. To determine optimal conditions of polycondensation, polythioesters from bis(4-mercaptophenyl)sulphone sebacoyl as well as isophthaloyl dichlorides were chosen as a model system. The structures of all polythioesters were determined by elemental analysis, i.r. and X-ray analysis. Initial Decomposition Temperature and maximum rate of Decomposition Temperature were defined from the curves of thermogravimetric analysis. Some physicochemical, mechanical and electrical properties have been determined.
