大豆分离蛋白/聚乙烯醇塑料的制备及性能研究  

Preparation and Properties of Soy Protein Isolate/PVA Plastics

作　　者：刘亮[1] 张丽叶[2] 

机构地区：[1]北京化工大学材料科学与工程学院,北京100029 [2]北京化工大学生命科学与技术学院,北京100029

出　　处：《中国塑料》2011年第7期17-22,共6页China Plastics

摘　　要：将聚乙烯醇(PVA)按不同比例与大豆分离蛋白(SPI)混合,采用丙三醇作为增塑剂,经模压成型制备SPI/PVA塑料,采用X射线衍射仪、动态热机械分析仪、差示扫描量热仪、万能电子拉力试验机、扫描电子显微镜等研究了SPI/PVA塑料的结构、形态和性能。结果表明,丙三醇增塑的SPI会出现微相分离,即出现富丙三醇微区和富蛋白微区,而PVA的加入主要破坏了SPI在富丙三醇微区的晶体结构,并使富丙三醇微区的玻璃化转变温度向高温方向偏移。PVA的加入还明显提高了SPI/PVA塑料的拉伸强度,当PVA含量为1份时,其拉伸强度比纯SPI塑料提高了41.5%;PVA的加入对SPI/PVA塑料的吸水性也有明显改善,其24 h吸水率从134.86%下降到77.38%。Polymer blends were prepared via thermo-pressing mixtures of soy protein isolate（SPI） and poly （vinyl alcohol） （PVA） using glycerol as a plasticizer. The structure, morphology, and properties of the blends were investigated using X-ray diffraction, dynamic mechanical analyzer, differential scanning calorimetry analyzer, universal electronic tensile testing machine, and scanning electron microscopy. Phase separation was observed between glycerol and SPI forming glycerol-rich and protein-rich domains. The addition of PVA significantly damaged the crystalline structure of SPI in glycerol-rich domain, and increased its glass transition temperature. When the content of PVA was 1 phr, the tensile strength of SPI/PVA increased by 41.5 %, and the 24 h water absorption of SPI/PVA decreased from 134.86 % to 77.38 %, based on neat SP1.

关 键 词：大豆分离蛋白 聚乙烯醇 结构 力学性能 吸水性 

分 类 号：TQ325.9[化学工程—合成树脂塑料工业]