Konjac glucomannan(KGM) has been generally used in food,film-former and biomedical applications,especially in the edible packing films due to its excellent film-forming ability,good biocompatibility and biodegrade-abi...Konjac glucomannan(KGM) has been generally used in food,film-former and biomedical applications,especially in the edible packing films due to its excellent film-forming ability,good biocompatibility and biodegrade-ability.It has the common flaws of natural polymers,such as low mechanical properties and poor antimicrobial activity,which severely limit their applications.In this paper,novel biodegradable films(NBF) of KGM with palmitoylated KGM(PKGM) were prepared by using the solventcasting technique.The structure,thermal and mechanical properties of the NBF were investigated.The results suggested that a strong hydrogen bonding was formed in NBF,which resulted in good miscibility between KGM and PKGM.The tensile strength and elongation at break of the NBF were enhanced significantly with the increase of PKGM in a certain range.With the addition of 0.75%PKGM by weight,tensile strength and elongation at break of NBF were improved largely to 117.12 MPa and 14.39%.From this work,we hope to provide one of the promising ways to design new edible food films and coatings materials with good mechanical properties.展开更多
Polylactide(PLA) films blended with 10 wt% poly(butylene adipate-co-terephthalate)(PBAT) were prepared by using a twin screw extruder in the presence of the nucleating agent of titanium dioxide(TiO2) and the c...Polylactide(PLA) films blended with 10 wt% poly(butylene adipate-co-terephthalate)(PBAT) were prepared by using a twin screw extruder in the presence of the nucleating agent of titanium dioxide(TiO2) and the compatibilizers of toluene diisocyanate(TDI) and PLA-grafted-maleic anhydride(PLA-g-MA). The synergistic effect of the nucleation and compatibilization on the properties and crystallization behavior of the PLA/PBAT(PLB) films was explored. The results showed that the addition of TiO2 significantly enhanced the tensile strength and the impact tensile resistance of the PLB films while slightly decreased its thermal stability. In addition, the compatibilizers of TDI and PLA-g-MA in the system not only affected the crystallinity and cold crystallization process of the PLB films, but also increased the mechanical properties of them due to the improvement of the interfacial interaction between PLA and PBAT revealed by the morphological measurement. The synergistic effects of the nucleating agent and the compatibilizer afforded the blend films with increased tensile strength and impact tensile toughness, improved cold crystallization property and Xc.展开更多
文摘Konjac glucomannan(KGM) has been generally used in food,film-former and biomedical applications,especially in the edible packing films due to its excellent film-forming ability,good biocompatibility and biodegrade-ability.It has the common flaws of natural polymers,such as low mechanical properties and poor antimicrobial activity,which severely limit their applications.In this paper,novel biodegradable films(NBF) of KGM with palmitoylated KGM(PKGM) were prepared by using the solventcasting technique.The structure,thermal and mechanical properties of the NBF were investigated.The results suggested that a strong hydrogen bonding was formed in NBF,which resulted in good miscibility between KGM and PKGM.The tensile strength and elongation at break of the NBF were enhanced significantly with the increase of PKGM in a certain range.With the addition of 0.75%PKGM by weight,tensile strength and elongation at break of NBF were improved largely to 117.12 MPa and 14.39%.From this work,we hope to provide one of the promising ways to design new edible food films and coatings materials with good mechanical properties.
基金This work was financially supported by the Prince of Songkla University (No. SCI570376S) and the Development and Promotion of Science and Technology Talents project (DPST).ACKNOWLEDGEMENTS Thanks to Dr. Brian Hodgson for the assistance with the English.
文摘Polylactide(PLA) films blended with 10 wt% poly(butylene adipate-co-terephthalate)(PBAT) were prepared by using a twin screw extruder in the presence of the nucleating agent of titanium dioxide(TiO2) and the compatibilizers of toluene diisocyanate(TDI) and PLA-grafted-maleic anhydride(PLA-g-MA). The synergistic effect of the nucleation and compatibilization on the properties and crystallization behavior of the PLA/PBAT(PLB) films was explored. The results showed that the addition of TiO2 significantly enhanced the tensile strength and the impact tensile resistance of the PLB films while slightly decreased its thermal stability. In addition, the compatibilizers of TDI and PLA-g-MA in the system not only affected the crystallinity and cold crystallization process of the PLB films, but also increased the mechanical properties of them due to the improvement of the interfacial interaction between PLA and PBAT revealed by the morphological measurement. The synergistic effects of the nucleating agent and the compatibilizer afforded the blend films with increased tensile strength and impact tensile toughness, improved cold crystallization property and Xc.