Documents disponibles écrits par cet auteur

Improving flexibility of poly(l-lactide) by blending with poly(l-lactic acid) based poly(ester-urethane) / Jian-Bing Zeng in Industrial & engineering chemistry research, Vol. 50 N° 10 (Mai 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 10 (Mai 2011) . - pp. 6124–6131 Titre : Improving flexibility of poly(l-lactide) by blending with poly(l-lactic acid) based poly(ester-urethane) : morphology, mechanical properties, and crystallization behaviors Type de document : texte imprimé Auteurs : Jian-Bing Zeng, Auteur ; Yi-Dong Li, Auteur ; Yi-Song He, Auteur Année de publication : 2011 Article en page(s) : pp. 6124–6131 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Crystallization  Mechanical  properties  Morphology  Flexibility Résumé : Poly(L-lactide) (PLLA) is one of the most promising biobased and biodegradable polymers. However, the lack of toughness restricts its application considerably. In the present study, PLLA was successfully toughened by blending with a poly(lactic acid) based poly(ester-urethane) (PEU), which contained poly(butylene succinate) as a flexible segment The tensile properties and notched Izod impact strength of PLLA and toughened PLLA were investigated. The flexibility of PLLA was considerably improved after introduction of PEU by the evidence of high strain and improved impact strength. The crystallization behavior was investigated by differential scanning calorimeter (DSC), polarized optical microscopy (POM), and wide-angle X-ray diffraction (WAXD). The glass transition temperature of toughened PLLA decreased with an increasing content of PEU, suggesting that the blends showed limited miscibility. POM observation showed that the crystallites of PEU uniformly distributed in the PLLA matrix after two-step crystallization at 120 and 60 °C. The results of WAXD suggest that the crystal structure of PLLA remained unchanged after blending with the PEU. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24158911 [article] Improving flexibility of poly(l-lactide) by blending with poly(l-lactic acid) based poly(ester-urethane) : morphology, mechanical properties, and crystallization behaviors [texte imprimé] / Jian-Bing Zeng, Auteur ; Yi-Dong Li, Auteur ; Yi-Song He, Auteur . - 2011 . - pp. 6124–6131. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 10 (Mai 2011) . - pp. 6124–6131 Mots-clés : Crystallization  Mechanical  properties  Morphology  Flexibility Résumé : Poly(L-lactide) (PLLA) is one of the most promising biobased and biodegradable polymers. However, the lack of toughness restricts its application considerably. In the present study, PLLA was successfully toughened by blending with a poly(lactic acid) based poly(ester-urethane) (PEU), which contained poly(butylene succinate) as a flexible segment The tensile properties and notched Izod impact strength of PLLA and toughened PLLA were investigated. The flexibility of PLLA was considerably improved after introduction of PEU by the evidence of high strain and improved impact strength. The crystallization behavior was investigated by differential scanning calorimeter (DSC), polarized optical microscopy (POM), and wide-angle X-ray diffraction (WAXD). The glass transition temperature of toughened PLLA decreased with an increasing content of PEU, suggesting that the blends showed limited miscibility. POM observation showed that the crystallites of PEU uniformly distributed in the PLLA matrix after two-step crystallization at 120 and 60 °C. The results of WAXD suggest that the crystal structure of PLLA remained unchanged after blending with the PEU. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24158911

Novel Biodegradable Poly(1,4-dioxan-2-one) Grafted Soy Protein Copolymer: Synthesis and Characterization / Yi-Dong Li in Industrial & engineering chemistry research, Vol. 47 n°21 (Novembre 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 n°21 (Novembre 2008) . - p. 8233–8238 Titre : Novel Biodegradable Poly(1,4-dioxan-2-one) Grafted Soy Protein Copolymer: Synthesis and Characterization Type de document : texte imprimé Auteurs : Yi-Dong Li, Auteur ; Si - Chong Chen, Auteur ; Jian-Bing Zeng, Auteur ; Yu-Zhong Wang, Auteur Année de publication : 2008 Article en page(s) : p. 8233–8238 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : BiodegradableNuclear  magnetic  resonance  (NMR) Résumé : A novel biodegradable copolymer, poly(1,4-dioxan-2-one) (PPDO) grafted soy protein isolate (SPI) (SPI-g-PPDO), was investigated. The ring-opening graft copolymerization of SPI-g-PPDO was carried out with stannous octoate as a co-initiator/catalyst in the presence of azeotropic solvent at 80 °C. The molecular structure of SPI-g-PPDO was characterized by Fourier transform infrared (FTIR) spectroscopy and nuclear magnetic resonance (NMR). The results suggested that the content and length of PPDO graft chains of the copolymer increased with the increase of monomer (1,4-dioxan-2-one, PDO) content. Moreover, the results of differential scanning calorimetry (DSC) showed that the copolymer has a definite glass transition temperature and melting point, meaning that the copolymer can be melt-processed. In addition, the copolymers could form crystals after the grafting polymerization. The crystallization ability increases with the increase of graft chain length. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800994s [article] Novel Biodegradable Poly(1,4-dioxan-2-one) Grafted Soy Protein Copolymer: Synthesis and Characterization [texte imprimé] / Yi-Dong Li, Auteur ; Si - Chong Chen, Auteur ; Jian-Bing Zeng, Auteur ; Yu-Zhong Wang, Auteur . - 2008 . - p. 8233–8238. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 n°21 (Novembre 2008) . - p. 8233–8238 Mots-clés : BiodegradableNuclear  magnetic  resonance  (NMR) Résumé : A novel biodegradable copolymer, poly(1,4-dioxan-2-one) (PPDO) grafted soy protein isolate (SPI) (SPI-g-PPDO), was investigated. The ring-opening graft copolymerization of SPI-g-PPDO was carried out with stannous octoate as a co-initiator/catalyst in the presence of azeotropic solvent at 80 °C. The molecular structure of SPI-g-PPDO was characterized by Fourier transform infrared (FTIR) spectroscopy and nuclear magnetic resonance (NMR). The results suggested that the content and length of PPDO graft chains of the copolymer increased with the increase of monomer (1,4-dioxan-2-one, PDO) content. Moreover, the results of differential scanning calorimetry (DSC) showed that the copolymer has a definite glass transition temperature and melting point, meaning that the copolymer can be melt-processed. In addition, the copolymers could form crystals after the grafting polymerization. The crystallization ability increases with the increase of graft chain length. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800994s

Rheology, crystallization, and biodegradability of blends based on soy protein and chemically modified poly(butylene succinate) / Yi-Dong Li in Industrial & engineering chemistry research, Vol. 48 N° 10 (Mai 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 10 (Mai 2009) . - pp. 4817–4825 Titre : Rheology, crystallization, and biodegradability of blends based on soy protein and chemically modified poly(butylene succinate) Type de document : texte imprimé Auteurs : Yi-Dong Li, Auteur ; Jian-Bing Zeng, Auteur ; Wen-Da Li, Auteur Année de publication : 2009 Article en page(s) : pp. 4817–4825 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : PBS  blends  Soy  protein  Crystallization  Biodegradability  Rheology Résumé : In our previous study, we found that modification of poly(butylene succinate) (PBS) by introducing urethane and isocyanate groups is an effective method for improving the mechanical properties and water resistance of soy-protein-based bioplastics. This study presents the effects of the structure and content of PBS components on the rheology, crystallization, and biodegradability of soy protein/PBS blends. Tests using a Haake torque rheometer and a high-pressure capillary rheometer both indicated that chemically modified PBS with a relatively low molecular weight can improve the flowability of the blend. According to differential scanning calorimeter measurements, the crystallization ability of the PBS component in a blend with improved compatibility is enhanced markedly compared with that of the pure PBS, and the nonisothermal crystallization behavior could be described by the Jeziorny model. A combination of the weight losses of the samples with the characterization of the surface microstructure shows that both the structure and the content of PBS influence the biodegradation rate of the blend in a compost medium. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801718f [article] Rheology, crystallization, and biodegradability of blends based on soy protein and chemically modified poly(butylene succinate) [texte imprimé] / Yi-Dong Li, Auteur ; Jian-Bing Zeng, Auteur ; Wen-Da Li, Auteur . - 2009 . - pp. 4817–4825. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 10 (Mai 2009) . - pp. 4817–4825 Mots-clés : PBS  blends  Soy  protein  Crystallization  Biodegradability  Rheology Résumé : In our previous study, we found that modification of poly(butylene succinate) (PBS) by introducing urethane and isocyanate groups is an effective method for improving the mechanical properties and water resistance of soy-protein-based bioplastics. This study presents the effects of the structure and content of PBS components on the rheology, crystallization, and biodegradability of soy protein/PBS blends. Tests using a Haake torque rheometer and a high-pressure capillary rheometer both indicated that chemically modified PBS with a relatively low molecular weight can improve the flowability of the blend. According to differential scanning calorimeter measurements, the crystallization ability of the PBS component in a blend with improved compatibility is enhanced markedly compared with that of the pure PBS, and the nonisothermal crystallization behavior could be described by the Jeziorny model. A combination of the weight losses of the samples with the characterization of the surface microstructure shows that both the structure and the content of PBS influence the biodegradation rate of the blend in a compost medium. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801718f

Synthesis and properties of poly(ester urethane)s consisting of poly(l-lactic acid) and poly(ethylene succinate) segments / Jian-Bing Zeng in Industrial & engineering chemistry research, Vol. 48 N°4 (Février 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N°4 (Février 2009) . - pp. 1706–1711 Titre : Synthesis and properties of poly(ester urethane)s consisting of poly(l-lactic acid) and poly(ethylene succinate) segments Type de document : texte imprimé Auteurs : Jian-Bing Zeng, Auteur ; Yi-Dong Li, Auteur ; Wen-Da Li, Auteur Année de publication : 2009 Article en page(s) : pp. 1706–1711 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Poly(ester  urethane)  Chain-extension  reaction  Poly(l-lactic  acid)  Poly(ethylene  succinate)  Polymerization Résumé : An aliphatic polyester based poly(ester urethane) (PEU) consisting of poly(l-lactic acid) and poly(ethylene succinate) was successfully prepared via chain-extension reaction of poly(l-lactic acid)-diol (PLLA-OH) and poly(ethylene succinate)-diol (PES-OH) using 1,6-hexamethlyene diisocyanate (HDI) as a chain extender. PLLA-OH was obtained by direct polycondensation of l-lactic acid in the presence of 1,4-butanediol. PES-OH was synthesized by condensation polymerization of succinic acid with excessive ethylene glycol. The structures and molecular weights of PLLA-OH, PES-OH, and PEUs were characterized by proton nuclear magnetic resonance (1H NMR), Fourier transform infrared (FTIR), and gel permeation chromatography (GPC). The PEUs were further studied by the means of thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), and tensile testing. The data of GPC analysis indicated that high molecular weights for example more than 200 000 g·mol−1 were easily synthesized through chain-extension reaction. The PEUs synthesized with high molecular weight and excellent tensile properties could find some applications in biomaterials and environmental friendly materials. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801391m [article] Synthesis and properties of poly(ester urethane)s consisting of poly(l-lactic acid) and poly(ethylene succinate) segments [texte imprimé] / Jian-Bing Zeng, Auteur ; Yi-Dong Li, Auteur ; Wen-Da Li, Auteur . - 2009 . - pp. 1706–1711. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N°4 (Février 2009) . - pp. 1706–1711 Mots-clés : Poly(ester  urethane)  Chain-extension  reaction  Poly(l-lactic  acid)  Poly(ethylene  succinate)  Polymerization Résumé : An aliphatic polyester based poly(ester urethane) (PEU) consisting of poly(l-lactic acid) and poly(ethylene succinate) was successfully prepared via chain-extension reaction of poly(l-lactic acid)-diol (PLLA-OH) and poly(ethylene succinate)-diol (PES-OH) using 1,6-hexamethlyene diisocyanate (HDI) as a chain extender. PLLA-OH was obtained by direct polycondensation of l-lactic acid in the presence of 1,4-butanediol. PES-OH was synthesized by condensation polymerization of succinic acid with excessive ethylene glycol. The structures and molecular weights of PLLA-OH, PES-OH, and PEUs were characterized by proton nuclear magnetic resonance (1H NMR), Fourier transform infrared (FTIR), and gel permeation chromatography (GPC). The PEUs were further studied by the means of thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), and tensile testing. The data of GPC analysis indicated that high molecular weights for example more than 200 000 g·mol−1 were easily synthesized through chain-extension reaction. The PEUs synthesized with high molecular weight and excellent tensile properties could find some applications in biomaterials and environmental friendly materials. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801391m