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Effect of nickel-containing layered double hydroxides and cyclophosphazene compound on the thermal stability and flame retardancy of poly(lactic acid) / Xueying Shan in Industrial & engineering chemistry research, Vol. 51 N° 40 (Octobre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 40 (Octobre 2012) . - pp. 13037-13045 Titre : Effect of nickel-containing layered double hydroxides and cyclophosphazene compound on the thermal stability and flame retardancy of poly(lactic acid) Type de document : texte imprimé Auteurs : Xueying Shan, Auteur ; Lei Song, Auteur ; Weiyi Xing, Auteur Année de publication : 2012 Article en page(s) : pp. 13037-13045 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Flame  Thermal  stability Résumé : Hydrotalcite-like anionic clays or layered double hydroxides with dodecylbenzenesulfonate anions (NiFe, NiAl, and NiCr LDH-SDS, where SDS denotes sodium dodecyl sulfate) were prepared by the coprecipitation method. Hexaphenoxycyclotriphosphazene (HPCP) is an effective cyclophosphazene flame retardant. The HPCP molecule contains a cyclic backbone consisting of alternating phosphorus and nitrogen atoms. LDH-SDS and HPCP were first used to prepare poly(lactic acid) (PLA) composites. One goal of this work was to compare the thermal stability and flame retardancy of PLA/ HPCP/LDH-SDS composites. The structures and properties of LDH-SDS materials were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), and thermogravimetric analysis (TGA). Thermal analysis and char residue analysis of PLA/HPCP/LDH-SDS composites suggested that NiFe, NiAl, and NiCr LDH-SDS materials play different roles in improving the thermal stability and flame retardancy of PLA composites. The effective mechanism of LDH-SDS and HPCP in PLA composites is also hypothesized in this work. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26451452 [article] Effect of nickel-containing layered double hydroxides and cyclophosphazene compound on the thermal stability and flame retardancy of poly(lactic acid) [texte imprimé] / Xueying Shan, Auteur ; Lei Song, Auteur ; Weiyi Xing, Auteur . - 2012 . - pp. 13037-13045. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 40 (Octobre 2012) . - pp. 13037-13045 Mots-clés : Flame  Thermal  stability Résumé : Hydrotalcite-like anionic clays or layered double hydroxides with dodecylbenzenesulfonate anions (NiFe, NiAl, and NiCr LDH-SDS, where SDS denotes sodium dodecyl sulfate) were prepared by the coprecipitation method. Hexaphenoxycyclotriphosphazene (HPCP) is an effective cyclophosphazene flame retardant. The HPCP molecule contains a cyclic backbone consisting of alternating phosphorus and nitrogen atoms. LDH-SDS and HPCP were first used to prepare poly(lactic acid) (PLA) composites. One goal of this work was to compare the thermal stability and flame retardancy of PLA/ HPCP/LDH-SDS composites. The structures and properties of LDH-SDS materials were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), and thermogravimetric analysis (TGA). Thermal analysis and char residue analysis of PLA/HPCP/LDH-SDS composites suggested that NiFe, NiAl, and NiCr LDH-SDS materials play different roles in improving the thermal stability and flame retardancy of PLA composites. The effective mechanism of LDH-SDS and HPCP in PLA composites is also hypothesized in this work. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26451452

Functionalization of cotton with UV - cured flame retardant coatings / Haixia Yuan in Industrial & engineering chemistry research, Vol. 51 N° 15 (Avril 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 15 (Avril 2012) . - pp. 5394–5401 Titre : Functionalization of cotton with UV - cured flame retardant coatings Type de document : texte imprimé Auteurs : Haixia Yuan, Auteur ; Weiyi Xing, Auteur ; Ping Zhang, Auteur Année de publication : 2012 Article en page(s) : pp. 5394–5401 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Textiles  Fibers Résumé : A novel phosphorus monomer (PDHA) was synthesized and incorporated onto the surface of cotton fabric via UV-induced graft polymerization to improve flame retardancy and thermal stability. The structure of PDHA was characterized by 1H nuclear magnetic resonance (1H NMR), 31P NMR, and Fourier transform infrared spectra (FTIR) and the grafting processes were followed by IR (ATR) spectroscopy and scanning electron microscopy (SEM). The thermal stability and flame retardancy of the treated fabrics were studied by thermogravimetric analysis (TGA), thermogravimetric analysis/infrared spectrometry (TGA-IR), and microscale combustion colorimeter (MCC). Test performed on real time FTIR analysis for treated cotton showed that the coatings containing phosphorus could catalyze the dehydration and char formation of cotton textiles at a lower temperature. The enhanced flame retardant action may be caused by the thermal decomposition of phosphate acrylate producing acidic intermediates, which could react with fabrics to alter its thermal decomposition. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie202468u [article] Functionalization of cotton with UV - cured flame retardant coatings [texte imprimé] / Haixia Yuan, Auteur ; Weiyi Xing, Auteur ; Ping Zhang, Auteur . - 2012 . - pp. 5394–5401. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 15 (Avril 2012) . - pp. 5394–5401 Mots-clés : Textiles  Fibers Résumé : A novel phosphorus monomer (PDHA) was synthesized and incorporated onto the surface of cotton fabric via UV-induced graft polymerization to improve flame retardancy and thermal stability. The structure of PDHA was characterized by 1H nuclear magnetic resonance (1H NMR), 31P NMR, and Fourier transform infrared spectra (FTIR) and the grafting processes were followed by IR (ATR) spectroscopy and scanning electron microscopy (SEM). The thermal stability and flame retardancy of the treated fabrics were studied by thermogravimetric analysis (TGA), thermogravimetric analysis/infrared spectrometry (TGA-IR), and microscale combustion colorimeter (MCC). Test performed on real time FTIR analysis for treated cotton showed that the coatings containing phosphorus could catalyze the dehydration and char formation of cotton textiles at a lower temperature. The enhanced flame retardant action may be caused by the thermal decomposition of phosphate acrylate producing acidic intermediates, which could react with fabrics to alter its thermal decomposition. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie202468u

Thermal degradation and flame retardance of biobased polylactide composites based on aluminum hypophosphite / Gang Tang in Industrial & engineering chemistry research, Vol. 51 N° 37 (Septembre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 37 (Septembre 2012) . - pp. 12009–12016 Titre : Thermal degradation and flame retardance of biobased polylactide composites based on aluminum hypophosphite Type de document : texte imprimé Auteurs : Gang Tang, Auteur ; Xin Wang, Auteur ; Weiyi Xing, Auteur Année de publication : 2012 Article en page(s) : pp. 12009–12016 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Thermal  behavior  Polylactide Résumé : A series of flame retardant polylactide composites (FR-PLA) based on aluminum hypophosphite (AHP) were facilely prepared by melt blending method. The thermal behavior, flammability, and mechanical properties of FR-PLA composites were investigated by thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), the UL-94 vertical burning test, limiting oxygen index (LOI), cone calorimeter testing, microscale combustion calorimetry, mechanical testing, and dynamic mechanical analysis (DMA). TGA results showed that the FR-PLA composites presented higher char residue and reduced mass loss rate than neat PLA. The FR-PLA composite showed excellent fire resistance, from no rating of neat PLA to a V0 rating of FR-PLA containing 20 wt % aluminum hypophosphite in the UL-94 test. The microscale combustion calorimetry test showed that the heat release capacity, the peak of heat release and the total heat release of FR-PLA composites were significantly decreased with the increase of AHP content. The cone calorimeter test also confirmed that the addition of AHP resulted in a significant decrease in the peak heat release rate value of PLA/AHP composites compared with pure PLA. Additionally, the results from DSC and DMA tests indicated that the addition of AHP into polylactide significantly changed the crystallization behavior and storage modulus of polylactide. However, the addition of AHP decreases the tensile strength and elongation at break. The char after LOI testing was investigated by scanning electron microscopy and craterlike morphology was observed on the surface of the char. The thermal degradation process of FR-PLA composites was analyzed by real-time Fourier transform infrared spectroscopy. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie3008133 [article] Thermal degradation and flame retardance of biobased polylactide composites based on aluminum hypophosphite [texte imprimé] / Gang Tang, Auteur ; Xin Wang, Auteur ; Weiyi Xing, Auteur . - 2012 . - pp. 12009–12016. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 37 (Septembre 2012) . - pp. 12009–12016 Mots-clés : Thermal  behavior  Polylactide Résumé : A series of flame retardant polylactide composites (FR-PLA) based on aluminum hypophosphite (AHP) were facilely prepared by melt blending method. The thermal behavior, flammability, and mechanical properties of FR-PLA composites were investigated by thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), the UL-94 vertical burning test, limiting oxygen index (LOI), cone calorimeter testing, microscale combustion calorimetry, mechanical testing, and dynamic mechanical analysis (DMA). TGA results showed that the FR-PLA composites presented higher char residue and reduced mass loss rate than neat PLA. The FR-PLA composite showed excellent fire resistance, from no rating of neat PLA to a V0 rating of FR-PLA containing 20 wt % aluminum hypophosphite in the UL-94 test. The microscale combustion calorimetry test showed that the heat release capacity, the peak of heat release and the total heat release of FR-PLA composites were significantly decreased with the increase of AHP content. The cone calorimeter test also confirmed that the addition of AHP resulted in a significant decrease in the peak heat release rate value of PLA/AHP composites compared with pure PLA. Additionally, the results from DSC and DMA tests indicated that the addition of AHP into polylactide significantly changed the crystallization behavior and storage modulus of polylactide. However, the addition of AHP decreases the tensile strength and elongation at break. The char after LOI testing was investigated by scanning electron microscopy and craterlike morphology was observed on the surface of the char. The thermal degradation process of FR-PLA composites was analyzed by real-time Fourier transform infrared spectroscopy. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie3008133

UV-curable functionalized graphene oxide/polyurethane acrylate nanocomposite coatings with enhanced thermal stability and mechanical properties / Bin Yu in Industrial & engineering chemistry research, Vol. 51 N° 45 (Novembre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 45 (Novembre 2012) . - pp. 14629-14636 Titre : UV-curable functionalized graphene oxide/polyurethane acrylate nanocomposite coatings with enhanced thermal stability and mechanical properties Type de document : texte imprimé Auteurs : Bin Yu, Auteur ; Xin Wang, Auteur ; Weiyi Xing, Auteur Année de publication : 2013 Article en page(s) : pp. 14629-14636 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Mechanical  properties  Thermal  stability  NanocompositeUltraviolet  radiation Résumé : Functionalized graphene oxide (FGO) was synthesized and subsequently incorporated into polyurethane acrylate (PUA) by UV curing technology. The structural and morphological features of FGO/PUA nanocomposite coatings were characterized by FTIR, XRD, and TEM. The results showed that FGO sheets were uniformly dispersed into the PUA matrix and formed the strong interfacial adhesion with PUA owing to the formation of the cross-linking networks between FGO and PUA after UV curing. The incorporation of FGO effectively enhanced the thermal stability and mechanical properties of host polymer. The initial degradation temperature of the PUA composite with 1.0 wt % FGO was increased to 316 °C from 299 °C for neat PUA. Meanwhile, the storage modulus and tensile strength of the PUA composite with 1.0 wt % FGO were also improved by 37% and 73%, respectively, compared with those of neat PUA. The slight increase in glass transition temperature (Tg) of the composites was observed upon the incorporation of FGO. By contrast, untreated GO/PUA nanocomposites exhibited relatively low thermal stability and poor mechanical properties than its modified-GO counterpart. The covalent functionalization of graphene oxide presented herein will provide a feasible and effective approach to obtain high-performance UV-curing nanocomposite coatings. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26620375 [article] UV-curable functionalized graphene oxide/polyurethane acrylate nanocomposite coatings with enhanced thermal stability and mechanical properties [texte imprimé] / Bin Yu, Auteur ; Xin Wang, Auteur ; Weiyi Xing, Auteur . - 2013 . - pp. 14629-14636. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 45 (Novembre 2012) . - pp. 14629-14636 Mots-clés : Mechanical  properties  Thermal  stability  NanocompositeUltraviolet  radiation Résumé : Functionalized graphene oxide (FGO) was synthesized and subsequently incorporated into polyurethane acrylate (PUA) by UV curing technology. The structural and morphological features of FGO/PUA nanocomposite coatings were characterized by FTIR, XRD, and TEM. The results showed that FGO sheets were uniformly dispersed into the PUA matrix and formed the strong interfacial adhesion with PUA owing to the formation of the cross-linking networks between FGO and PUA after UV curing. The incorporation of FGO effectively enhanced the thermal stability and mechanical properties of host polymer. The initial degradation temperature of the PUA composite with 1.0 wt % FGO was increased to 316 °C from 299 °C for neat PUA. Meanwhile, the storage modulus and tensile strength of the PUA composite with 1.0 wt % FGO were also improved by 37% and 73%, respectively, compared with those of neat PUA. The slight increase in glass transition temperature (Tg) of the composites was observed upon the incorporation of FGO. By contrast, untreated GO/PUA nanocomposites exhibited relatively low thermal stability and poor mechanical properties than its modified-GO counterpart. The covalent functionalization of graphene oxide presented herein will provide a feasible and effective approach to obtain high-performance UV-curing nanocomposite coatings. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26620375