摘要
以硬脂酸为改性剂、甘油为增塑剂,分别采用溶液浇铸法、高温模压法制备了小麦醇溶蛋白膜,考察了硬脂酸改性对醇溶蛋白膜力学性能、动态力学性能及吸水与透湿性能的影响。结果表明,模压膜的性能明显优于浇铸膜。随硬脂酸含量增大,模压膜弹性模量增大,吸水率略有降低,而透湿率明显降低。模压膜呈现相分离结构,硬脂酸改性可降低蛋白质富集相的非均质程度,并使甘油富集相的玻璃化转变温度向高温移动。
Wheat gliadin films with glycerol as plasticizer and stearic acid as modifier were prepared using solution-casting and thermo-molding methods. Influences of stearic acid content on the mechanical properties, dynamic mechanical properties as well as moisture absorption and water vapor permeability of the films were investigated. The results showed that thermo-molded films possessed higher tensile strength and lower moisture absorption and water vapor permeability than the casting films. For the thermo-molded films, elasticity modulus increased markedly while moisture absorption decreased slightly with increasing stearic acid content. On the other hand, water vapor permeability was reduced considerably by stearic acid modification. The thermo-molded films showed phase-separated structure and exhibited three glass transition regions extending over -100-150℃. The chemical modification by stearic acid could reduce the degree of heterogeneity in the protein-rich phase and also caused an increase in the glass transition temperature in the glycerol-rich phase.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2008年第4期656-659,共4页
Journal of Functional Materials
基金
国家自然科学基金资助项目(50473039)
