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Facile synthesis of poly (vinyl alcohol) / a - titanium phosphate nanocomposite with markedly enhanced properties / Chenlu Bao in Industrial & engineering chemistry research, Vol. 50 N° 19 (Octobre 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 19 (Octobre 2011) . - pp. 11109-11116 Titre : Facile synthesis of poly (vinyl alcohol) / a - titanium phosphate nanocomposite with markedly enhanced properties Type de document : texte imprimé Auteurs : Chenlu Bao, Auteur ; Yuqiang Guo, Auteur ; Lei Song, Auteur Année de publication : 2011 Article en page(s) : pp. 11109-11116 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Nanocomposite Résumé : Nanocomposites based on poly(vinyl alcohol) and a-titanium phosphate were prepared by the solvent-cast method. The a-titanium phosphate nanosheets were homogeneously dispersed in the poly(vinyl alcohol) matrix, and marked property enhancements were obtained. In thermogravimetric analysis, the maximum decomposition temperature of the nanocomposites was increased by 80 °C, and the value of maximum decomposition was reduced by 60%. The storage modulus and tensile strength were improved by 64% and 84%, respectively. According to microscale combustion calorimetry, the ignition temperature (89 °C) and the temperature for peak heat release rate (192 °C) were significantly increased, whereas the peak heat release rate was sharply reduced (79%). The property enhancements are mainly due to strong hydrogen bonds between the poly(vinyl alcohol) and a-titanium phosphate nanolayers, as well as the molecule-movement-restricting and physical-barrier effects due to the a-titanium phosphate nanolayers. In addition, the effects of the water content and α-titanium phosphate amount on the electrical conductivity of poly(vinyl alcohol) nanocomposites were investigated. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24573308 [article] Facile synthesis of poly (vinyl alcohol) / a - titanium phosphate nanocomposite with markedly enhanced properties [texte imprimé] / Chenlu Bao, Auteur ; Yuqiang Guo, Auteur ; Lei Song, Auteur . - 2011 . - pp. 11109-11116. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 19 (Octobre 2011) . - pp. 11109-11116 Mots-clés : Nanocomposite Résumé : Nanocomposites based on poly(vinyl alcohol) and a-titanium phosphate were prepared by the solvent-cast method. The a-titanium phosphate nanosheets were homogeneously dispersed in the poly(vinyl alcohol) matrix, and marked property enhancements were obtained. In thermogravimetric analysis, the maximum decomposition temperature of the nanocomposites was increased by 80 °C, and the value of maximum decomposition was reduced by 60%. The storage modulus and tensile strength were improved by 64% and 84%, respectively. According to microscale combustion calorimetry, the ignition temperature (89 °C) and the temperature for peak heat release rate (192 °C) were significantly increased, whereas the peak heat release rate was sharply reduced (79%). The property enhancements are mainly due to strong hydrogen bonds between the poly(vinyl alcohol) and a-titanium phosphate nanolayers, as well as the molecule-movement-restricting and physical-barrier effects due to the a-titanium phosphate nanolayers. In addition, the effects of the water content and α-titanium phosphate amount on the electrical conductivity of poly(vinyl alcohol) nanocomposites were investigated. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24573308

In Situ polymerization of graphene, graphite Oxide, and functionalized graphite oxide into epoxy resin and comparison study of on-the-flame behavior / Yuqiang Guo in Industrial & engineering chemistry research, Vol. 50 N° 13 (Juillet 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 13 (Juillet 2011) . - pp. 7772–7783 Titre : In Situ polymerization of graphene, graphite Oxide, and functionalized graphite oxide into epoxy resin and comparison study of on-the-flame behavior Type de document : texte imprimé Auteurs : Yuqiang Guo, Auteur ; Chenlu Bao, Auteur ; Lei Song, Auteur Année de publication : 2011 Article en page(s) : pp. 7772–7783 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Flame  Polymerization  In  situ Résumé : Starting from expandable graphite (EG), graphene, graphite oxide (GO), and organic phosphate functionalized graphite oxides (FGO) were prepared and incorporated into epoxy resin (EP) matrix via in situ polymerization to prepare EP based composites. The structure of the composites was characterized by transmission electron microscopy to show good dispersion without large aggregates. The thermal behavior investigated by thermogravimetric analysis indicated the EP/graphene composites show the highest onset temperature and maximum weight loss temperature compared with those added with GO and FGO. The flame retardant properties investigated by micro combustion calorimeter illustrate that both EP/graphene and EP/FGO composites perform better than EP/GO composites in flame retardant properties with a maximum reduction of 23.7% in peak-heat release rate when containing 5 wt % FGO and a maximum reduction of 43.9% at 5 wt % loading of graphene. This study represents a new approach to prepare functionalized GO with flame retardant elements to improve the flame retardancy of polymer and gives a way of application of graphene in enhancing thermal stabilities of polymer. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24332099 [article] In Situ polymerization of graphene, graphite Oxide, and functionalized graphite oxide into epoxy resin and comparison study of on-the-flame behavior [texte imprimé] / Yuqiang Guo, Auteur ; Chenlu Bao, Auteur ; Lei Song, Auteur . - 2011 . - pp. 7772–7783. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 13 (Juillet 2011) . - pp. 7772–7783 Mots-clés : Flame  Polymerization  In  situ Résumé : Starting from expandable graphite (EG), graphene, graphite oxide (GO), and organic phosphate functionalized graphite oxides (FGO) were prepared and incorporated into epoxy resin (EP) matrix via in situ polymerization to prepare EP based composites. The structure of the composites was characterized by transmission electron microscopy to show good dispersion without large aggregates. The thermal behavior investigated by thermogravimetric analysis indicated the EP/graphene composites show the highest onset temperature and maximum weight loss temperature compared with those added with GO and FGO. The flame retardant properties investigated by micro combustion calorimeter illustrate that both EP/graphene and EP/FGO composites perform better than EP/GO composites in flame retardant properties with a maximum reduction of 23.7% in peak-heat release rate when containing 5 wt % FGO and a maximum reduction of 43.9% at 5 wt % loading of graphene. This study represents a new approach to prepare functionalized GO with flame retardant elements to improve the flame retardancy of polymer and gives a way of application of graphene in enhancing thermal stabilities of polymer. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24332099

Preparation and characterization of flame-retardant aluminum hypophosphite/Poly(Vinyl Alcohol) composite / Bihe Yuan in Industrial & engineering chemistry research, Vol. 51 N° 43 (Octobre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 43 (Octobre 2012) . - pp. 14065-14075 Titre : Preparation and characterization of flame-retardant aluminum hypophosphite/Poly(Vinyl Alcohol) composite Type de document : texte imprimé Auteurs : Bihe Yuan, Auteur ; Chenlu Bao, Auteur ; Yuqiang Guo, Auteur Année de publication : 2013 Article en page(s) : pp. 14065-14075 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Composite  material  Flame  retardant  Preparation Résumé : Composites based on poly(vinyl alcohol) (PVA) and aluminum hypophosphite (AHP) are prepared by solvent blending. The thermal, mechanical, and crystallinity properties of the composites are studied. AHP remarkably improves the char residue yield during the thermal degradation and combustion of AHP/PVA composites. The flame retardancy of the composites is obviously improved. The increased char which protects underlying PVA from heat and oxygen is one of the key reasons for the improved flame retardancy. The crystallinity of the composites is decreased. The glass transition temperature (Tg) and the storage modulus of the composites are increased. In the composite with 15 wt % AHP, limiting oxygen index (LOI) reaches 28.0%, UL-94 V-0 rating is obtained, Tg is increased by 7 °C, and the storage modulus is increased by 17.2% in comparison with neat PVA. Moreover, AHP/PVA composites keep high transparence and maintain most of the mechanical properties of PVA, which is advantageous for the practical application of the composites. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26593334 [article] Preparation and characterization of flame-retardant aluminum hypophosphite/Poly(Vinyl Alcohol) composite [texte imprimé] / Bihe Yuan, Auteur ; Chenlu Bao, Auteur ; Yuqiang Guo, Auteur . - 2013 . - pp. 14065-14075. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 43 (Octobre 2012) . - pp. 14065-14075 Mots-clés : Composite  material  Flame  retardant  Preparation Résumé : Composites based on poly(vinyl alcohol) (PVA) and aluminum hypophosphite (AHP) are prepared by solvent blending. The thermal, mechanical, and crystallinity properties of the composites are studied. AHP remarkably improves the char residue yield during the thermal degradation and combustion of AHP/PVA composites. The flame retardancy of the composites is obviously improved. The increased char which protects underlying PVA from heat and oxygen is one of the key reasons for the improved flame retardancy. The crystallinity of the composites is decreased. The glass transition temperature (Tg) and the storage modulus of the composites are increased. In the composite with 15 wt % AHP, limiting oxygen index (LOI) reaches 28.0%, UL-94 V-0 rating is obtained, Tg is increased by 7 °C, and the storage modulus is increased by 17.2% in comparison with neat PVA. Moreover, AHP/PVA composites keep high transparence and maintain most of the mechanical properties of PVA, which is advantageous for the practical application of the composites. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26593334