高等学校化学学报 ›› 2012, Vol. 33 ›› Issue (12): 2822.doi: 10.7503/cjcu20120057

• 高分子化学 • 上一篇    下一篇

六水合硝酸镁增塑改性淀粉-聚乙烯醇复合膜的合成与性能

蒋婷, 江献财, 张晓飞, 代华, 张熙   

  1. 四川大学高分子研究所, 高分子材料工程国家重点实验室, 成都 610065
  • 收稿日期:2012-01-12 出版日期:2012-12-10 发布日期:2012-11-20
  • 通讯作者: 张熙,男,教授,博士生导师,主要从事水溶性及功能性高分子材料研究.E-mail:zhangxi@scu.edu.cn E-mail:zhangxi@scu.edu.cn
  • 基金资助:

    国家自然科学基金(批准号: 50833003)资助.

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

摘要:

以六水合硝酸镁[Mg(NO3)2·6H2O]为增塑剂, 采用流延法制备了增塑改性的淀粉-聚乙烯醇(PVA)复合膜, 并研究了改性后淀粉-PVA复合膜的性能. 研究结果表明, Mg(NO3)2·6H2O与淀粉和PVA发生一定的相互作用, 破坏了淀粉和PVA中的结晶结构. 因此, Mg(NO3)2·6H2O的加入可提高淀粉与PVA间的相容性, 改变了淀粉-PVA复合膜的力学性能, 使其拉伸强度下降, 断裂伸长率提高.

关键词: 聚乙烯醇, 淀粉, 六水合硝酸镁, 增塑, 力学性能

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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