Department of Materials Science and Engineering, Northwestern University, Evanston, IL 60208, USA.
Department of Chemical Engineering, University of Alicante, Apartado 99, 03080 Alicante, Spain.
Carbohydr Polym. 2021 Jun 1;261:117727. doi: 10.1016/j.carbpol.2021.117727. Epub 2021 Feb 16.
The quartz crystal microbalance (QCM) is used as a non-destructive and efficient characterization tool for thin thermoplastic starch (TPS) films. Thin TPS films (1-2 μm) were prepared with 30% (w/w starch) plasticizers using either glycerol or an ionic liquid, 1-ethyl-3-methylimidiazolium acetate ([emim][Ac]), as the plasticizer. The differences in the mechanical properties and environmental effects on the plasticized TPS films were explored. The modulus of starch-glycerol films was higher than starch-[emim][Ac], consistent with literature data and bulk AFM measurements, likely due to superior plasticization by the ionic liquid. The starch-[emim][Ac] films were shown to have relative stable properties at low humidity that may be due to some antiplasticization effects at low water content despite absorbing more water than starch-glycerol films at higher humidity.
石英晶体微天平 (QCM) 可用作无损且高效的手段，用于对热塑性淀粉 (TPS) 薄膜进行特性分析。使用 30%（w/w 淀粉）增塑剂，包括甘油或离子液体 1-乙基-3-甲基咪唑醋酸盐 ([emim][Ac])，制备了厚度为 1-2μm 的 TPS 薄膜。研究了增塑 TPS 薄膜的机械性能差异和环境影响。淀粉-甘油薄膜的模量高于淀粉-[emim][Ac]，这与文献数据和体 AFM 测量结果一致，可能是由于离子液体的增塑效果更好。尽管在高湿度下吸收的水分比淀粉-甘油薄膜多，但淀粉-[emim][Ac]薄膜在低湿度下显示出相对稳定的性能，这可能是由于在低含水量下存在一些反增塑化效应。
