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%。
Film was cast from a mixture of soy protein isolate （SPI） and calcium stearate （CaSte） containing glycerol as a plasticizer. The structure and properties of the film were investigated using attenuated total reflectance-Fourier transform infrared, X-ray diffraction, thermal properties, tensile testing, and water vapor permeability. The crystallinity of modified SPI film increased by 70. 4%, and thus tighter compacted. The thermal analysis indicated that thermal stability of modified SPI film was enhanced. As the concentration of CaSte was increased, the values of water vapor permeability decreased. When the content of CaSt2 was 12 %, the water vapor barrier ability increased by 40%; the elongation at break increased by 67.63 %.
出处
《中国塑料》
CAS
CSCD
北大核心
2012年第5期28-34,共7页
China Plastics
关键词
大豆分离蛋白
硬脂酸钙
薄膜
改性
soy protein isolate
calcium stearate
film
modification
