Documents disponibles écrits par cet auteur

Development and characterization of fire retarded glass - fiber reinforced poly(1,4 - butylene terephthalate) composites based on a novel flame retardant system / Wei Yang in Industrial & engineering chemistry research, Vol. 50 N° 21 (Novembre 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 21 (Novembre 2011) . - pp. 11975-11981 Titre : Development and characterization of fire retarded glass - fiber reinforced poly(1,4 - butylene terephthalate) composites based on a novel flame retardant system Type de document : texte imprimé Auteurs : Wei Yang, Auteur ; Richard K. K. Yuen, Auteur ; Yuan Hu, Auteur Année de publication : 2011 Article en page(s) : pp. 11975-11981 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Flame  retardant  Composite  material  Glass  fiber  Fires Résumé : The aim of this work was to develop halogen-free glass-fiber reinforced poly( 1,4-butylene terephthalate) (GRPBT) composites with significantly improved fire retardancy performance using a novel flame retardant system. The system was composed of aluminum hypophosphite (AHP), polycarbonate (PC), and melamine cyanurate (MC). The GRPBT composite containing the system achieved a V-0 classification in UL-94 testing (the thickness of testing bar was 0.8 mm). In microscale combustion calorimeter and cone calorimeter testing, both of the two different PHRRs (peak of heat release rate) for GRPBT composites were remarkably reduced by the incorporation ofthe novel system. Thermogravimetric analysis and residue characterization revealed that the addition of PC promoted the formation of char residues leading to the reduction of mass loss rate, which resulted in the improvement of fire retardancy. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24697517 [article] Development and characterization of fire retarded glass - fiber reinforced poly(1,4 - butylene terephthalate) composites based on a novel flame retardant system [texte imprimé] / Wei Yang, Auteur ; Richard K. K. Yuen, Auteur ; Yuan Hu, Auteur . - 2011 . - pp. 11975-11981. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 21 (Novembre 2011) . - pp. 11975-11981 Mots-clés : Flame  retardant  Composite  material  Glass  fiber  Fires Résumé : The aim of this work was to develop halogen-free glass-fiber reinforced poly( 1,4-butylene terephthalate) (GRPBT) composites with significantly improved fire retardancy performance using a novel flame retardant system. The system was composed of aluminum hypophosphite (AHP), polycarbonate (PC), and melamine cyanurate (MC). The GRPBT composite containing the system achieved a V-0 classification in UL-94 testing (the thickness of testing bar was 0.8 mm). In microscale combustion calorimeter and cone calorimeter testing, both of the two different PHRRs (peak of heat release rate) for GRPBT composites were remarkably reduced by the incorporation ofthe novel system. Thermogravimetric analysis and residue characterization revealed that the addition of PC promoted the formation of char residues leading to the reduction of mass loss rate, which resulted in the improvement of fire retardancy. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24697517

Enhanced thermal properties and flame retardancy of a novel transparent poly (methyl methacrylate) - based hybrid prepared by the sol – gel method / Saihua Jiang in Industrial & engineering chemistry research, Vol. 51 N° 28 (Juillet 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 28 (Juillet 2012) . - pp. 9447-9455 Titre : Enhanced thermal properties and flame retardancy of a novel transparent poly (methyl methacrylate) - based hybrid prepared by the sol – gel method Type de document : texte imprimé Auteurs : Saihua Jiang, Auteur ; Yuan Hu, Auteur ; Zhou Gui, Auteur Année de publication : 2012 Article en page(s) : pp. 9447-9455 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Flame  Thermal  properties Résumé : A novel monomer, poly(ethylene glycol) monoacrylate aminopropyltriethoxysilane phenyl phosphate (SNP), containing phosphorus, nitrogen, and silicon was synthesized and then incorporated into a poly(methyl methacrylate) (PMMA) matrix through copolymerization and the sol-gel method to produce organic―inorganic hybrids. The chemical structure of SNP was characterized by FTIR, 1H NMR, 29Si NMR, and 31P NMR spectroscopies. The 29Si MAS NMR results for the hybrid materials suggested the formation of cross-linked networks in the hybrids. A morphological study showed that the inorganic particles were well distributed in the PMMA matrix. The hybrids retained a high transparency and exhibited a significant improvement in glass transition temperature, thermal stability, hardness, and flame retardancy upon the incorporation of SNP into the PMMA matrix. The network structure, homogeneous distribution, and char formation during degradation were proposed as three key reasons for the improved properties. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26163280 [article] Enhanced thermal properties and flame retardancy of a novel transparent poly (methyl methacrylate) - based hybrid prepared by the sol – gel method [texte imprimé] / Saihua Jiang, Auteur ; Yuan Hu, Auteur ; Zhou Gui, Auteur . - 2012 . - pp. 9447-9455. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 28 (Juillet 2012) . - pp. 9447-9455 Mots-clés : Flame  Thermal  properties Résumé : A novel monomer, poly(ethylene glycol) monoacrylate aminopropyltriethoxysilane phenyl phosphate (SNP), containing phosphorus, nitrogen, and silicon was synthesized and then incorporated into a poly(methyl methacrylate) (PMMA) matrix through copolymerization and the sol-gel method to produce organic―inorganic hybrids. The chemical structure of SNP was characterized by FTIR, 1H NMR, 29Si NMR, and 31P NMR spectroscopies. The 29Si MAS NMR results for the hybrid materials suggested the formation of cross-linked networks in the hybrids. A morphological study showed that the inorganic particles were well distributed in the PMMA matrix. The hybrids retained a high transparency and exhibited a significant improvement in glass transition temperature, thermal stability, hardness, and flame retardancy upon the incorporation of SNP into the PMMA matrix. The network structure, homogeneous distribution, and char formation during degradation were proposed as three key reasons for the improved properties. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26163280

Fabrication and characterization of TiO2 nanotube – epoxy nanocomposites / Yu Wu in Industrial & engineering chemistry research, Vol. 50 N° 21 (Novembre 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 21 (Novembre 2011) . - pp. 11988–11995 Titre : Fabrication and characterization of TiO2 nanotube – epoxy nanocomposites Type de document : texte imprimé Auteurs : Yu Wu, Auteur ; Lei Song, Auteur ; Yuan Hu, Auteur Année de publication : 2011 Article en page(s) : pp. 11988–11995 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Nanocomposite  Titanium  oxide Résumé : A systematic study has been conducted to investigate the polymer matrix properties resulting from the introduction of TiO2 nanotubes (1-5% by weight) that had been surface-modified with phenyl dichlorophosphate (PDCP), into an epoxy resin. The thermal, mechanical, and combustion properties of the nanocomposites and the neat resin were measured by thermogravimetric analysis, dynamic mechanical thermal analysis, and microscale combustion calorimetry. The nanofiller infusion improved the thermal and mechanical properties of the epoxy resin. The nanocomposites resulted in an increase in the storage modulus and glass transition temperature compared to those of the neat epoxy resin. In addition, the combustion characteristics of the epoxy polymer were effectively improved by addition of the surface-modified nanotubes. Thermogravimetric analysis/infrared spectrometry and direct pyrolysis mass spectrometry confirmed that the TiO2 nanotubes were able to improve the thermal stability and combustion behavior of the polymer matrix because the TNTs retard the release of inflammable gas and change the degradation pathway. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24697519 [article] Fabrication and characterization of TiO2 nanotube – epoxy nanocomposites [texte imprimé] / Yu Wu, Auteur ; Lei Song, Auteur ; Yuan Hu, Auteur . - 2011 . - pp. 11988–11995. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 21 (Novembre 2011) . - pp. 11988–11995 Mots-clés : Nanocomposite  Titanium  oxide Résumé : A systematic study has been conducted to investigate the polymer matrix properties resulting from the introduction of TiO2 nanotubes (1-5% by weight) that had been surface-modified with phenyl dichlorophosphate (PDCP), into an epoxy resin. The thermal, mechanical, and combustion properties of the nanocomposites and the neat resin were measured by thermogravimetric analysis, dynamic mechanical thermal analysis, and microscale combustion calorimetry. The nanofiller infusion improved the thermal and mechanical properties of the epoxy resin. The nanocomposites resulted in an increase in the storage modulus and glass transition temperature compared to those of the neat epoxy resin. In addition, the combustion characteristics of the epoxy polymer were effectively improved by addition of the surface-modified nanotubes. Thermogravimetric analysis/infrared spectrometry and direct pyrolysis mass spectrometry confirmed that the TiO2 nanotubes were able to improve the thermal stability and combustion behavior of the polymer matrix because the TNTs retard the release of inflammable gas and change the degradation pathway. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24697519

Flame retardancy and thermal degradation of intumescent flame retardant starch-based biodegradable composites / Kun Wu in Industrial & engineering chemistry research, Vol. 48 N° 6 (Mars 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 6 (Mars 2009) . - pp. 3150–3157 Titre : Flame retardancy and thermal degradation of intumescent flame retardant starch-based biodegradable composites Type de document : texte imprimé Auteurs : Kun Wu, Auteur ; Yuan Hu, Auteur ; Lei Song, Auteur Année de publication : 2009 Article en page(s) : pp. 3150–3157 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Biodegradable  polyvinyl  alcohol  Thermoplastic  starch  Microencapsulated  ammonium  polyphosphate  Microscale  combustion  calorimeter Résumé : Biodegradable PVA/glycerol-plasticized thermoplastic starch (TPS) and its intumescent flame retardant composites are prepared. Microencapsulated ammonium polyphosphate (MCAPP) was used not only to utilize the charring capacity of the polyhydric compounds but also to restrain the reaction between APP and starch during processing. The flame retardancy and thermal stability of TPS and TPS/MCAPP were characterized by LOI, UL 94, TG, and microscale combustion calorimeter (MCC). TPS/MCAPP composites with only 2 wt % MCAPP can pass V-0 in UL 94 test. However, neat TPS cannot pass any rating. The presence of MCAPP can reduce the total heat release of TPS sharply in MCC test. The thermal degradation and gas products of TPS and TPS/MCAPP were monitored by TG-FTIR and dynamic FTIR. XPS and SEM measurements were utilized to investigate the chemical structure, as well as the surface morphology of the residual char. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801230h [article] Flame retardancy and thermal degradation of intumescent flame retardant starch-based biodegradable composites [texte imprimé] / Kun Wu, Auteur ; Yuan Hu, Auteur ; Lei Song, Auteur . - 2009 . - pp. 3150–3157. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 6 (Mars 2009) . - pp. 3150–3157 Mots-clés : Biodegradable  polyvinyl  alcohol  Thermoplastic  starch  Microencapsulated  ammonium  polyphosphate  Microscale  combustion  calorimeter Résumé : Biodegradable PVA/glycerol-plasticized thermoplastic starch (TPS) and its intumescent flame retardant composites are prepared. Microencapsulated ammonium polyphosphate (MCAPP) was used not only to utilize the charring capacity of the polyhydric compounds but also to restrain the reaction between APP and starch during processing. The flame retardancy and thermal stability of TPS and TPS/MCAPP were characterized by LOI, UL 94, TG, and microscale combustion calorimeter (MCC). TPS/MCAPP composites with only 2 wt % MCAPP can pass V-0 in UL 94 test. However, neat TPS cannot pass any rating. The presence of MCAPP can reduce the total heat release of TPS sharply in MCC test. The thermal degradation and gas products of TPS and TPS/MCAPP were monitored by TG-FTIR and dynamic FTIR. XPS and SEM measurements were utilized to investigate the chemical structure, as well as the surface morphology of the residual char. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801230h

Investigation of thermal and combustion properties for intumescent flame-retardant ethylene–viny acetate composites containing ferrous disulfide / Lei Wang in Industrial & engineering chemistry research, Vol. 51 N° 46 (Novembre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 46 (Novembre 2012) . - pp. 15082-15088 Titre : Investigation of thermal and combustion properties for intumescent flame-retardant ethylene–viny acetate composites containing ferrous disulfide Type de document : texte imprimé Auteurs : Lei Wang, Auteur ; Yuan Hu, Auteur ; Lei Song, Auteur Année de publication : 2013 Article en page(s) : pp. 15082-15088 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Composite  material  Flame  retardant  Combustion Résumé : Ferrous disulfide (FeS2) nanocrystals were synthesized via a simple hydrothermal reaction. The FeS2 nanocrystals were then combined in intumescent flame-retardant ethylene―vinyl acetate (EVA/IFR) systems. Thermogravimetric analysis data indicate that the addition of FeS2 into the EVA/IFR composite can improve the char yields. Cone calorimeter results reveal that FeS2 and IFR can clearly change the decomposition behavior of EVA and form a char layer on the surface of the composites, consequently resulting in efficient reduction of the flammability parameters, such as the heat release rate, total heat release, and so on. Moreover, significant improvements are obtained in the limited oxygen index and Underwriters Laboratories 94 ratings. Laser Raman spectroscopy of residual char shows that the ordered carbon is increased with the addition of FeS2. Scanning electron microscopy demonstrates that FeS2 can help the EVA/IFR system form a dense char layer. The results of dynamic mechanical thermal analyses reveal that FeS2 can increase the glass transition temperature and the storage modulus of EVA/IFR. The mechanism is also proposed in this paper. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26679627 [article] Investigation of thermal and combustion properties for intumescent flame-retardant ethylene–viny acetate composites containing ferrous disulfide [texte imprimé] / Lei Wang, Auteur ; Yuan Hu, Auteur ; Lei Song, Auteur . - 2013 . - pp. 15082-15088. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 46 (Novembre 2012) . - pp. 15082-15088 Mots-clés : Composite  material  Flame  retardant  Combustion Résumé : Ferrous disulfide (FeS2) nanocrystals were synthesized via a simple hydrothermal reaction. The FeS2 nanocrystals were then combined in intumescent flame-retardant ethylene―vinyl acetate (EVA/IFR) systems. Thermogravimetric analysis data indicate that the addition of FeS2 into the EVA/IFR composite can improve the char yields. Cone calorimeter results reveal that FeS2 and IFR can clearly change the decomposition behavior of EVA and form a char layer on the surface of the composites, consequently resulting in efficient reduction of the flammability parameters, such as the heat release rate, total heat release, and so on. Moreover, significant improvements are obtained in the limited oxygen index and Underwriters Laboratories 94 ratings. Laser Raman spectroscopy of residual char shows that the ordered carbon is increased with the addition of FeS2. Scanning electron microscopy demonstrates that FeS2 can help the EVA/IFR system form a dense char layer. The results of dynamic mechanical thermal analyses reveal that FeS2 can increase the glass transition temperature and the storage modulus of EVA/IFR. The mechanism is also proposed in this paper. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26679627