CJCU

Chem. J. Chinese Universities ›› 2012, Vol. 33 ›› Issue (12): 2822.doi: 10.7503/cjcu20120057

• Polymer Chemistry • Previous Articles     Next Articles

Preparation and Properties of Starch/Poly(vinyl alcohol) Film Plasticized by Magnesium Nitrate Hexahydrate

JIANG Ting, JIANG Xian-Cai, ZHANG Xiao-Fei, DAI Hua, ZHANG Xi   

  1. State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu 610065, China
  • Received:2012-01-12 Online:2012-12-10 Published:2012-11-20
  • Contact: Zhang Xi E-mail:zhangxi@scu.edu.cn

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Abstract:

The plasticized starch/poly(vinyl alcohol)(PVA) film was prepared by casting method using magnesium nitrate hexahydrate [Mg(NO3)2·6H2O] as the plasticizer. The micro morphologies of pure starch/PVA and Mg(NO3)2·6H2O plasticized starch/PVA film were observed by scanning electron microscope(SEM). The interaction between Mg(NO3)2·6H2O and starch/PVA molecule was investigated by Fourier transform infrared(FTIR). The crystallinity and thermal properties were measured by X-ray diffraction measurement(XRD) and thermogravimetric analysis(TGA). The mechanical properties were measured by tensile testing and dynamic mechanical analysis(DMA). It was found that Mg(NO3)2·6H2O could form some interaction with starch and PVA molecules. The addition of Mg(NO3)2·6H2O could improve the miscibility of starch and PVA. The XRD results showed that Mg(NO3)2·6H2O could destroy the crystals of starch and PVA. The TGA results showed that the thermal stability of starch/PVA decreased with the addition of Mg(NO3)2·6H2O. Tensile testing showed that Mg(NO3)2·6H2O was highly effective in modifying the mechanical properties of starch/PVA film, making the elongation at break of starch/PVA film largely increased from 8% of pure starch/PVA film to 514% with 60%Mg(NO3)2·6H2O.

Key words: Poly(vinyl alcohol), Starch, Magnesium nitrate hexahydrate, Plasticization, Mechanical property

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