The Experts below are selected from a list of 306 Experts worldwide ranked by ideXlab platform

Gang Zhou - One of the best experts on this subject based on the ideXlab platform.

  • effect of polyethylene glycol on the mechanical property microstructure thermal stability and Flame Resistance of phenol urea formaldehyde foams
    Journal of Materials Science, 2014
    Co-Authors: De Ming Wang, Wei Min Cheng, Gang Zhou
    Abstract:

    In this study, polyethylene glycol (PEG) was added to phenol–urea–formaldehyde foam to improve its toughness, and the effects of PEG, with different molecular weights and dosages, on the mechanical property, microstructure, thermal stability, and Flame Resistance of phenol–urea–formaldehyde foam were studied. The addition of PEG significantly increased the toughness and impact strength and decreased the pulverization rate of the foam. The compression strength of the foam first increased and then decreased with increasing amounts of PEG. When 2 wt% PEGs were added, the compression strength of foams was the highest. The addition of PEG significantly influenced the microstructure of phenol–urea–formaldehyde foams, in which the cell diameter decreased and wall thickness increased with increasing amount and molecular weight of PEG. The addition of PEG also slightly decreased the thermal stability of phenol–urea–formaldehyde foams, and increased the heat release rate, total heat release, and total smoke release of the foams.

  • Effect of polyethylene glycol on the mechanical property, microstructure, thermal stability, and Flame Resistance of phenol–urea–formaldehyde foams
    Journal of Materials Science, 2013
    Co-Authors: De Ming Wang, Wei Min Cheng, Gang Zhou
    Abstract:

    In this study, polyethylene glycol (PEG) was added to phenol–urea–formaldehyde foam to improve its toughness, and the effects of PEG, with different molecular weights and dosages, on the mechanical property, microstructure, thermal stability, and Flame Resistance of phenol–urea–formaldehyde foam were studied. The addition of PEG significantly increased the toughness and impact strength and decreased the pulverization rate of the foam. The compression strength of the foam first increased and then decreased with increasing amounts of PEG. When 2 wt% PEGs were added, the compression strength of foams was the highest. The addition of PEG significantly influenced the microstructure of phenol–urea–formaldehyde foams, in which the cell diameter decreased and wall thickness increased with increasing amount and molecular weight of PEG. The addition of PEG also slightly decreased the thermal stability of phenol–urea–formaldehyde foams, and increased the heat release rate, total heat release, and total smoke release of the foams.

Yiuwing Mai - One of the best experts on this subject based on the ideXlab platform.

  • simultaneous improvement in the Flame Resistance and thermal conductivity of epoxy al2o3 composites by incorporating polymeric Flame retardant functionalized graphene
    Journal of Materials Chemistry, 2017
    Co-Authors: Yuezhan Feng, Yang Xue, Xingping Zhou, Xiaolin Xie, Yiuwing Mai
    Abstract:

    Fire hazards related to polymer-based thermally conductive composites (PTCs) used in electronic equipment are a significant, but often neglected, risk. Here, we offer a solution by incorporating Flame retardant-functionalized graphene (PFR-fRGO) into PTCs using a procedure that improves both their Flame Resistance and thermal conductivity. Briefly, PFR-fRGO was prepared by covalently grafting a polyphosphoramide oligomer (PDMPD) onto the surface of graphene, which was then introduced in situ into epoxy resin/Al2O3 (EP/Al2O3) composites. As expected, the incorporation of PFR-fRGO not only increased the thermal conduction paths by weakening the settlement of microparticles, but also reduced the interfacial thermal Resistance by enhancing interfacial interactions, both of which resulted in an enhancement of the thermal conductivity of the ternary composites. The resultant EP/Al2O3/PFR-fRGO composite exhibited a superior Flame retarding ability with dramatic decreases being seen in the high peak heat release rate (PHRR), the total heat release (THR) and the total smoke production (TSP), i.e. 53%, 37% and 57%, respectively, when compared to pure epoxy resin. Additionally, a synergistic Flame retarding effect was found in the ternary composite compared to the EP/PFR-fRGO and EP/Al2O3 composites. The remarkable enhancement in Flame retardancy was mainly attributed to the catalytic charring effect of PFR-fRGO and the template effect of Al2O3, both of which resulted in the formation of a high strength, thermally stable protective layer in the condensed phase that is able to retard the permeation of heat and volatile degradation products during combustion, slow down the heat release rate and protect the underlying polymer.

  • Simultaneous improvement in the Flame Resistance and thermal conductivity of epoxy/Al2O3 composites by incorporating polymeric Flame retardant-functionalized graphene
    Journal of Materials Chemistry, 2017
    Co-Authors: Yuezhan Feng, Yang Xue, Xingping Zhou, Xiaolin Xie, Yiuwing Mai
    Abstract:

    Fire hazards related to polymer-based thermally conductive composites (PTCs) used in electronic equipment are a significant, but often neglected, risk. Here, we offer a solution by incorporating Flame retardant-functionalized graphene (PFR-fRGO) into PTCs using a procedure that improves both their Flame Resistance and thermal conductivity. Briefly, PFR-fRGO was prepared by covalently grafting a polyphosphoramide oligomer (PDMPD) onto the surface of graphene, which was then introduced in situ into epoxy resin/Al2O3 (EP/Al2O3) composites. As expected, the incorporation of PFR-fRGO not only increased the thermal conduction paths by weakening the settlement of microparticles, but also reduced the interfacial thermal Resistance by enhancing interfacial interactions, both of which resulted in an enhancement of the thermal conductivity of the ternary composites. The resultant EP/Al2O3/PFR-fRGO composite exhibited a superior Flame retarding ability with dramatic decreases being seen in the high peak heat release rate (PHRR), the total heat release (THR) and the total smoke production (TSP), i.e. 53%, 37% and 57%, respectively, when compared to pure epoxy resin. Additionally, a synergistic Flame retarding effect was found in the ternary composite compared to the EP/PFR-fRGO and EP/Al2O3 composites. The remarkable enhancement in Flame retardancy was mainly attributed to the catalytic charring effect of PFR-fRGO and the template effect of Al2O3, both of which resulted in the formation of a high strength, thermally stable protective layer in the condensed phase that is able to retard the permeation of heat and volatile degradation products during combustion, slow down the heat release rate and protect the underlying polymer.

Takeshi Furuno - One of the best experts on this subject based on the ideXlab platform.

  • Properties of Colloidal Silica‐Fixed and Propionylated Wood Composite (II): Flame Resistance and Other Properties of the Composites
    Journal of Wood Chemistry and Technology, 2005
    Co-Authors: Takeshi Furuno, Wen‐rui Zhou
    Abstract:

    Abstract The Flame Resistance, color change, strength, and decay Resistance of colloidal silica‐fixed (CSW), propionylated only, and propionylated dual‐treated wood (CSPW) composites were evaluated. The oxygen indexes of the CSPW composites were similar to the CSW composites but much higher than those of untreated woods and the propionylated woods. The oxygen indexes increased with an increase in the weight percent gain of the colloidal silica (WPGcsi) in the composites, showing an effective reduction in the flammability by the fixation of colloidal silica. The CSPW composites showed little or no difference in the modulus of elasticity and modulus of rupture compared with the untreated woods, indicating little or no significant reduction in strength properties of the wood specimens. The color difference of the wood specimens before and after treatment changed slightly. Minimal weight losses of the CSPW composites occurred upon fungal attack by T. versicolor and F. palustris, showing good decay Resistance ...

  • Dimensional stability and Flame Resistance of silicate-acetylated and -propionylated wood composites
    Journal of Wood Chemistry and Technology, 2000
    Co-Authors: Takeshi Furuno, Sadanobu Katoh
    Abstract:

    Abstract Silicate-acetylated wood (SAW) and silicate-propionylated wood (SPW) composites were prepared, and the dimensional stability and Flame Resistance of these composites were evaluated. The silicate gels had insignificant effects on the rate of acetylation or propionylation of wood. In the presence of silicate gels, the SAW and SPW composites showed slightly lower anti-swelling efficiency (ASE) during water or moisture absorption and a lower moisture excluding efficiency (MEE) than the corresponding acetylated wood and propionylated wood, but the SAW and SPW composites still retained fairly good dimensional stability. The oxygen indices (OIs) of the SAW and SPW composites were higher than those of untreated wood specimens and increased with an increase in the weight percent gains (WPGsiS) of silicate gel fixation. The silicate gel fixation endowed the composites with Flame Resistance.

Yuezhan Feng - One of the best experts on this subject based on the ideXlab platform.

  • simultaneous improvement in the Flame Resistance and thermal conductivity of epoxy al2o3 composites by incorporating polymeric Flame retardant functionalized graphene
    Journal of Materials Chemistry, 2017
    Co-Authors: Yuezhan Feng, Yang Xue, Xingping Zhou, Xiaolin Xie, Yiuwing Mai
    Abstract:

    Fire hazards related to polymer-based thermally conductive composites (PTCs) used in electronic equipment are a significant, but often neglected, risk. Here, we offer a solution by incorporating Flame retardant-functionalized graphene (PFR-fRGO) into PTCs using a procedure that improves both their Flame Resistance and thermal conductivity. Briefly, PFR-fRGO was prepared by covalently grafting a polyphosphoramide oligomer (PDMPD) onto the surface of graphene, which was then introduced in situ into epoxy resin/Al2O3 (EP/Al2O3) composites. As expected, the incorporation of PFR-fRGO not only increased the thermal conduction paths by weakening the settlement of microparticles, but also reduced the interfacial thermal Resistance by enhancing interfacial interactions, both of which resulted in an enhancement of the thermal conductivity of the ternary composites. The resultant EP/Al2O3/PFR-fRGO composite exhibited a superior Flame retarding ability with dramatic decreases being seen in the high peak heat release rate (PHRR), the total heat release (THR) and the total smoke production (TSP), i.e. 53%, 37% and 57%, respectively, when compared to pure epoxy resin. Additionally, a synergistic Flame retarding effect was found in the ternary composite compared to the EP/PFR-fRGO and EP/Al2O3 composites. The remarkable enhancement in Flame retardancy was mainly attributed to the catalytic charring effect of PFR-fRGO and the template effect of Al2O3, both of which resulted in the formation of a high strength, thermally stable protective layer in the condensed phase that is able to retard the permeation of heat and volatile degradation products during combustion, slow down the heat release rate and protect the underlying polymer.

  • Simultaneous improvement in the Flame Resistance and thermal conductivity of epoxy/Al2O3 composites by incorporating polymeric Flame retardant-functionalized graphene
    Journal of Materials Chemistry, 2017
    Co-Authors: Yuezhan Feng, Yang Xue, Xingping Zhou, Xiaolin Xie, Yiuwing Mai
    Abstract:

    Fire hazards related to polymer-based thermally conductive composites (PTCs) used in electronic equipment are a significant, but often neglected, risk. Here, we offer a solution by incorporating Flame retardant-functionalized graphene (PFR-fRGO) into PTCs using a procedure that improves both their Flame Resistance and thermal conductivity. Briefly, PFR-fRGO was prepared by covalently grafting a polyphosphoramide oligomer (PDMPD) onto the surface of graphene, which was then introduced in situ into epoxy resin/Al2O3 (EP/Al2O3) composites. As expected, the incorporation of PFR-fRGO not only increased the thermal conduction paths by weakening the settlement of microparticles, but also reduced the interfacial thermal Resistance by enhancing interfacial interactions, both of which resulted in an enhancement of the thermal conductivity of the ternary composites. The resultant EP/Al2O3/PFR-fRGO composite exhibited a superior Flame retarding ability with dramatic decreases being seen in the high peak heat release rate (PHRR), the total heat release (THR) and the total smoke production (TSP), i.e. 53%, 37% and 57%, respectively, when compared to pure epoxy resin. Additionally, a synergistic Flame retarding effect was found in the ternary composite compared to the EP/PFR-fRGO and EP/Al2O3 composites. The remarkable enhancement in Flame retardancy was mainly attributed to the catalytic charring effect of PFR-fRGO and the template effect of Al2O3, both of which resulted in the formation of a high strength, thermally stable protective layer in the condensed phase that is able to retard the permeation of heat and volatile degradation products during combustion, slow down the heat release rate and protect the underlying polymer.

Wei Min Cheng - One of the best experts on this subject based on the ideXlab platform.

  • effect of polyethylene glycol on the mechanical property microstructure thermal stability and Flame Resistance of phenol urea formaldehyde foams
    Journal of Materials Science, 2014
    Co-Authors: De Ming Wang, Wei Min Cheng, Gang Zhou
    Abstract:

    In this study, polyethylene glycol (PEG) was added to phenol–urea–formaldehyde foam to improve its toughness, and the effects of PEG, with different molecular weights and dosages, on the mechanical property, microstructure, thermal stability, and Flame Resistance of phenol–urea–formaldehyde foam were studied. The addition of PEG significantly increased the toughness and impact strength and decreased the pulverization rate of the foam. The compression strength of the foam first increased and then decreased with increasing amounts of PEG. When 2 wt% PEGs were added, the compression strength of foams was the highest. The addition of PEG significantly influenced the microstructure of phenol–urea–formaldehyde foams, in which the cell diameter decreased and wall thickness increased with increasing amount and molecular weight of PEG. The addition of PEG also slightly decreased the thermal stability of phenol–urea–formaldehyde foams, and increased the heat release rate, total heat release, and total smoke release of the foams.

  • Effect of polyethylene glycol on the mechanical property, microstructure, thermal stability, and Flame Resistance of phenol–urea–formaldehyde foams
    Journal of Materials Science, 2013
    Co-Authors: De Ming Wang, Wei Min Cheng, Gang Zhou
    Abstract:

    In this study, polyethylene glycol (PEG) was added to phenol–urea–formaldehyde foam to improve its toughness, and the effects of PEG, with different molecular weights and dosages, on the mechanical property, microstructure, thermal stability, and Flame Resistance of phenol–urea–formaldehyde foam were studied. The addition of PEG significantly increased the toughness and impact strength and decreased the pulverization rate of the foam. The compression strength of the foam first increased and then decreased with increasing amounts of PEG. When 2 wt% PEGs were added, the compression strength of foams was the highest. The addition of PEG significantly influenced the microstructure of phenol–urea–formaldehyde foams, in which the cell diameter decreased and wall thickness increased with increasing amount and molecular weight of PEG. The addition of PEG also slightly decreased the thermal stability of phenol–urea–formaldehyde foams, and increased the heat release rate, total heat release, and total smoke release of the foams.