PPC对挤压成型Zein-PPC复合薄膜性质的影响  

Effect of Polypropylene Carbonate Content on Properties of Extruded Zein-PPC Films

作　　者：李秀明[1] 陈野[1] 王君予[1] 于翠柳[1] 张宁[1] 杨叶[1] 

机构地区：[1]天津科技大学食品工程与生物技术学院,天津300457

出　　处：《食品科学》2012年第19期6-10,共5页Food Science

基　　金：国家自然科学基金项目(31071634)

摘　　要：以玉米醇溶蛋白(zein)和聚丙撑碳酸酯(PPC)为主原料,以甘油为可塑剂,利用挤压法制备Zein-PPC复合薄膜,并对复合薄膜的机械性能、形态学和结构进行研究。结果表明:PPC的引入提高了复合薄膜的拉伸强度,当PPC含量为30%时,其拉伸强度最大,为30.11MPa;应用Halsey方程,建立了拉伸强度与相对湿度关系模型;差示扫描量热仪(DSC)分析表明复合薄膜具有稳定的热特性;傅里叶变换红外光谱(FT-IR)和X射线衍射实验发现,复合薄膜中玉米醇溶蛋白的羧基与PPC中的羟基发生反应生成了酯键,保证了复合膜的稳定性。Glycerol was used as a plasticizer to prepare zein-PPC films from zein and polypropylene carbonate （PPC） by extrusion. The mechanical characteristics, morphology and structure of zein-PPC films were studied. The tensile strength of zein-PPC films was enhanced by adding PPC and reached maximum level （30.11 MPa） at a PPC content of 30%. A Halsey model reflecting the relationship the tensile strength of zein-PPC films and relative humidity was established. The composite films had stable thermal properties as demonstrated by differential scanning calorimetry （DSC） analysis. FT-IR and X-ray analyses indicated the formation of ester bonds from carboxyl groups in zein and hydroxyl groups in PPC, maintaining the stability of zein-PPC films.

关 键 词：玉米醇溶蛋白 聚丙撑碳酸酯 复合薄膜 机械特性 扫描电子显微镜 

分 类 号：TQ321.4[化学工程—合成树脂塑料工业]