| Titre : | Preparation and rheological behaviors of thermoplastic poly(vinyl alcohol) modified by lactic acid (2011) |
| Auteurs : | Jing Ding, Auteur ; Si - Chong Chen, Auteur ; Xiu-Li Wang, Auteur |
| Type de document : | Article : texte imprimé |
| Dans : | Industrial & engineering chemistry research (Vol. 50 N° 15, Août 2011) |
| Article en page(s) : | pp. 9123-9130 |
| Note générale : | Chimie industrielle |
| Langues : | Anglais |
| Tags : | 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 |
