BioTeam/ICPEES-ECPM, UMR CNRS 7515, Université de Strasbourg, 25 rue Becquerel, 67087 Strasbourg, Cedex 2, France.
BioTeam/ICPEES-ECPM, UMR CNRS 7515, Université de Strasbourg, 25 rue Becquerel, 67087 Strasbourg, Cedex 2, France.
Carbohydr Polym. 2017 Feb 10;157:669-676. doi: 10.1016/j.carbpol.2016.10.037. Epub 2016 Oct 14.
Plasticized alginate films with different biobased polyols (glycerol and sorbitol) and their mixtures were successfully prepared by thermo-mechanical mixing instead of the usual casting-evaporation procedure. The microstructure and properties of the different plasticized alginate formulations were investigated by SEM, FTIR, XRD, DMTA and uniaxial tensile tests. SEM and XRD results showed that native alginate particles were largely destructured with the plasticizers (polyols and water), under a thermo-mechanical input. With increasing amount of plasticizers, the samples showed enhanced homogeneity while their thermal and mechanical properties decreased. Compared to sorbitol, glycerol resulted in alginate films with a higher flexibility due to its better plasticization efficiency resulting from its smaller size and higher hydrophilic character. Glycerol and sorbitol mixtures seemed to be an optimum to obtain the best properties. This work showed that thermo-mechanical mixing is a promising method to produce, at large scale, plasticized alginate-based films with improved properties.
采用热机械混合而不是通常的浇铸-蒸发方法成功制备了具有不同生物基多元醇（甘油和山梨糖醇）及其混合物的增塑海藻酸盐薄膜。通过 SEM、FTIR、XRD、DMTA 和单轴拉伸试验研究了不同增塑海藻酸盐配方的微观结构和性能。SEM 和 XRD 结果表明，在热机械输入下，天然海藻酸盐颗粒与增塑剂（多元醇和水）大量解体。随着增塑剂用量的增加，样品的均匀性得到提高，而其热性能和机械性能下降。与山梨糖醇相比，由于其较小的尺寸和较高的亲水性，甘油具有更好的增塑效率，使海藻酸盐薄膜具有更高的柔韧性。甘油和山梨糖醇混合物似乎是获得最佳性能的最佳选择。这项工作表明，热机械混合是一种很有前途的方法，可以大规模生产具有改善性能的基于海藻酸盐的增塑薄膜。
