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Preparation and rheological behaviors of thermoplastic poly(vinyl alcohol) modified by lactic acid / Jing Ding in Industrial & engineering chemistry research, Vol. 50 N° 15 (Août 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 15 (Août 2011) . - pp. 9123-9130 Titre : Preparation and rheological behaviors of thermoplastic poly(vinyl alcohol) modified by lactic acid Type de document : texte imprimé Auteurs : Jing Ding, Auteur ; Si - Chong Chen, Auteur ; Xiu - Li Wang, Auteur Année de publication : 2011 Article en page(s) : pp. 9123-9130 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Preparation  Thermoplastic Résumé : A thermoplastic modified poly(vinyl alcohol) (PVA-g-LA) with improved melt processing property was prepared by melt polycondensation of PVA with lactic acid. Rheological behaviors of PVA-g-LA copolymers were investigated using a high-pressure capillary rheometer. The influences of the content of oligo-poly (lactic add) graft chains and content of PVA-0588 on the rheological properties of PVA-g-LA copolymers were researched. The rheological parameters including non-Newtonian index and the viscous flow activation energy were analyzed and evaluated. As predicted, the PVA-g-LA samples exhibited noticeable shear thinning behavior. The apparent viscosity, the viscous flow activation energy, and the non-Newtonian index of PVA-g-LA showed obvious correlation with the PLA grafting chain content and PVA-0588 content at a constant temperature and shear rate. Both the increase of the content of oligo-PLA graft chains and content of PVA-0588 with PVA-1799 can improve the melting flow processing of PVA-g-LA copolymer. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24395860 [article] Preparation and rheological behaviors of thermoplastic poly(vinyl alcohol) modified by lactic acid [texte imprimé] / Jing Ding, Auteur ; Si - Chong Chen, Auteur ; Xiu - Li Wang, Auteur . - 2011 . - pp. 9123-9130. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 15 (Août 2011) . - pp. 9123-9130 Mots-clés : Preparation  Thermoplastic Résumé : A thermoplastic modified poly(vinyl alcohol) (PVA-g-LA) with improved melt processing property was prepared by melt polycondensation of PVA with lactic acid. Rheological behaviors of PVA-g-LA copolymers were investigated using a high-pressure capillary rheometer. The influences of the content of oligo-poly (lactic add) graft chains and content of PVA-0588 on the rheological properties of PVA-g-LA copolymers were researched. The rheological parameters including non-Newtonian index and the viscous flow activation energy were analyzed and evaluated. As predicted, the PVA-g-LA samples exhibited noticeable shear thinning behavior. The apparent viscosity, the viscous flow activation energy, and the non-Newtonian index of PVA-g-LA showed obvious correlation with the PLA grafting chain content and PVA-0588 content at a constant temperature and shear rate. Both the increase of the content of oligo-PLA graft chains and content of PVA-0588 with PVA-1799 can improve the melting flow processing of PVA-g-LA copolymer. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24395860

Synthesis and properties of thermoplastic poly(vinyl alcohol)-graft-lactic acid copolymers / Jing Ding in Industrial & engineering chemistry research, Vol. 48 N°2 (Janvier 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N°2 (Janvier 2009) . - p. 788–793 Titre : Synthesis and properties of thermoplastic poly(vinyl alcohol)-graft-lactic acid copolymers Type de document : texte imprimé Auteurs : Jing Ding, Auteur ; Si - Chong Chen, Auteur ; Xiu - Li Wang, Auteur ; Yu-Zhong Wang, Auteur Année de publication : 2009 Article en page(s) : p. 788–793 Note générale : chemical engineering Langues : Anglais (eng) Mots-clés : Thermoplastic  Poly  --Properties Résumé : Poly(vinyl alcohol)-graft-lactic acid (PVA-g-LA) was synthesized by melt polycondensation of PVA and lactic acid using stannous chloride as a catalyst. The molecular structure of the copolymer was characterized by 1H NMR. The thermal properties of PVA-g-LA were investigated by differential scanning calorimetry and thermogravimetric analysis. The results showed that the PVA-g-LA copolymer exhibited lower glass transition temperature (Tg) and melting temperature (Tm) and higher decomposition temperature (Td) than pure PVA, and a difference of 60−80 °C between Tm and Td could be obtained, suggesting that the introduction of the oligo-poly(lactic acid) grafted chains can give rise to the melting flow processing of PVA. PVA-g-LA films prepared by compression molding at 140−150 °C had good flexibility and elasticity as well as water resistance. The copolymers have a potential application in food packaging. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8013428 [article] Synthesis and properties of thermoplastic poly(vinyl alcohol)-graft-lactic acid copolymers [texte imprimé] / Jing Ding, Auteur ; Si - Chong Chen, Auteur ; Xiu - Li Wang, Auteur ; Yu-Zhong Wang, Auteur . - 2009 . - p. 788–793. chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N°2 (Janvier 2009) . - p. 788–793 Mots-clés : Thermoplastic  Poly  --Properties Résumé : Poly(vinyl alcohol)-graft-lactic acid (PVA-g-LA) was synthesized by melt polycondensation of PVA and lactic acid using stannous chloride as a catalyst. The molecular structure of the copolymer was characterized by 1H NMR. The thermal properties of PVA-g-LA were investigated by differential scanning calorimetry and thermogravimetric analysis. The results showed that the PVA-g-LA copolymer exhibited lower glass transition temperature (Tg) and melting temperature (Tm) and higher decomposition temperature (Td) than pure PVA, and a difference of 60−80 °C between Tm and Td could be obtained, suggesting that the introduction of the oligo-poly(lactic acid) grafted chains can give rise to the melting flow processing of PVA. PVA-g-LA films prepared by compression molding at 140−150 °C had good flexibility and elasticity as well as water resistance. The copolymers have a potential application in food packaging. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8013428

Volumetric connectivity index / Yan Xiong in Industrial & engineering chemistry research, Vol. 50 N° 24 (Décembre 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 24 (Décembre 2011) . - pp. 14155-14161 Titre : Volumetric connectivity index : A new approach for estimation of density of ionic liquids Type de document : texte imprimé Auteurs : Yan Xiong, Auteur ; Jing Ding, Auteur ; Dahong Yu, Auteur Année de publication : 2012 Article en page(s) : pp. 14155-14161 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Ionic  liquid  Density Résumé : A new approach named volumetric connectivity index (VCI) based on the physical observable volumes of groups and the concept of molecular connectivity index is proposed for the prediction of the density of ionic liquids (ILs). The capability of VCI in the prediction by combination of group (formula units) volumes for a new and as yet not prepared modification can provide an estimate of the density of that compound. In this work, the densities at room temperature of 142 pure ILs including imidazoliom, pyridinium, pyrrolidinium, piperidmium, quaternary ammonium, and quaternary phosphonium are estimated by this new model, and the results are compared with the experimental data collected from the most commonly used literatures. The average deviation for the prediction of all the 142 ILS is only 0.63%, and R2 and rmsd are 0.9971 and 0.01214 g·cm―3, respectively. Combined with a model called mass connectivity index (MCI), the new model can also be used to predict the densities of ILs at different temperatures accurately with the room temperature density obtained input in MCI. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25299885 [article] Volumetric connectivity index : A new approach for estimation of density of ionic liquids [texte imprimé] / Yan Xiong, Auteur ; Jing Ding, Auteur ; Dahong Yu, Auteur . - 2012 . - pp. 14155-14161. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 24 (Décembre 2011) . - pp. 14155-14161 Mots-clés : Ionic  liquid  Density Résumé : A new approach named volumetric connectivity index (VCI) based on the physical observable volumes of groups and the concept of molecular connectivity index is proposed for the prediction of the density of ionic liquids (ILs). The capability of VCI in the prediction by combination of group (formula units) volumes for a new and as yet not prepared modification can provide an estimate of the density of that compound. In this work, the densities at room temperature of 142 pure ILs including imidazoliom, pyridinium, pyrrolidinium, piperidmium, quaternary ammonium, and quaternary phosphonium are estimated by this new model, and the results are compared with the experimental data collected from the most commonly used literatures. The average deviation for the prediction of all the 142 ILS is only 0.63%, and R2 and rmsd are 0.9971 and 0.01214 g·cm―3, respectively. Combined with a model called mass connectivity index (MCI), the new model can also be used to predict the densities of ILs at different temperatures accurately with the room temperature density obtained input in MCI. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25299885