writer：Jing Ding, Si-Chong Chen,* Xiu-Li Wang, and Yu-Zhong Wang*
keywords：Thermoplastic Poly(vinyl alcohol)
source：期刊
specific source：Industrial & Engineering Chemistry Research
Issue time：2011年

A thermoplastic modified poly(vinyl alcohol) (PVA-g-LA) with improved melt processing property was prepared bymelt polycondensation of PVA with lactic acid. Rheological behaviors of PVA-g-LA copolymers were investigated using a highpressure capillary rheometer. The influences of the content of oligo-poly (lactic acid) 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.