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.
出处
《食品科学》
EI
CAS
CSCD
北大核心
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)
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
zein
polypropylene carbonate （PPC）
film
mechanical characteristics
scanning electron microscopy （SEM）
