中国塑料

中国塑料 ›› 2012, Vol. 26 ›› Issue (05): 28-34 .DOI: 10.19491/j.issn.1001-9278.2012.05.005

• 材料与性能 • 上一篇    下一篇

硬脂酸钙对大豆分离蛋白塑料结构和性能的影响

白晓娇 张丽叶   

  1. 北京化工大学 北京化工大学
  • 收稿日期:2011-12-19 修回日期:1900-01-01 出版日期:2012-05-26 发布日期:2012-05-26

Effect of Calcium Stearate on Structure and Properties of Soy Protein Isolate Plastics

BAI Xiaojiao ZHANG Liye   

  • Received:2011-12-19 Revised:1900-01-01 Online:2012-05-26 Published:2012-05-26
  • Contact: ZHANG Liye

摘要： 将硬脂酸钙（CaSt2）与大豆分离蛋白（SPI）以不同比例混合，丙三醇作为增塑剂，经过涂膜的方式制备了改性SPI薄膜。通过衰减全反射-傅里叶变换红外光谱、X射线衍射、热分析、力学性能测试和水蒸气透过率系数等表征手段，研究了CaSt2改性SPI薄膜的结构和性能。结果表明，CaSt2在SPI中以两种结构形式存在，其中离子形式为主。与纯SPI薄膜相比，改性SPI薄膜的结晶度提高了70.4 %，内部结构更加致密。热分析表明，改性SPI薄膜的热稳定性增强。随着CaSt2含量的增加，改性SPI薄膜的水蒸气透过系数下降，当其含量为12 %时，水蒸气阻透能力提高了40 %；同时，断裂伸长率提高了67.63 %。

关键词: 大豆分离蛋白, 硬脂酸钙, 薄膜, 改性

Abstract: Films was cast from a mixture of soy protein isolate (SPI) and calcium stearate (CaSt2) containing glycerol as a plasticizer. The structure and properties of the plastics were investigated using attenuated total reflectance-Fourier transform infrared, X-ray diffraction, thermal properties, tensile properties and water vapor permeability. The results showed that CaSt2 existed in two structural forms, in which the ions form as the main structure. The crystallinity of modified SPI film increased by 70.4%, and then the internal structure was more compact. The thermal analysis indicated that thermal stability of modified SPI film enhanced. As the concentration of CaSt2 was increased, the values of water vapor permeability decreased, when the content of 12 %, the capacity of water vapor barrier increased by 40 %; the elongation at break increased by 67.63 %.

Key words: soy protein isolate, calcium stearate, film, modification

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