| Titre : | Synthesis and properties of thermoplastic poly(vinyl alcohol)-graft-lactic acid copolymers (2009) |
| Auteurs : | Jing Ding, Auteur ; Si - Chong Chen, Auteur ; Xiu-Li Wang, Auteur ; Yu-Zhong Wang, Auteur |
| Type de document : | Article : texte imprimé |
| Dans : | Industrial & engineering chemistry research (Vol. 48 N°2, Janvier 2009) |
| Article en page(s) : | p. 788–793 |
| Note générale : | chemical engineering |
| Langues : | Anglais |
| Tags : | 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 |
