Department of Polymer Engineering, Faculty of Mechanical Engineering, Budapest University of Technology and Economics, Muegyetem rkp. 3., H-1111 Budapest, Hungary.
Laboratory on Structure and Properties of Polymers, Department on Applied Organic Chemistry, Faculty of Chemistry and Pharmacy, University of Sofia, 1 James Bourchier Blvd., BG-1164 Sofia, Bulgaria.
Carbohydr Polym. 2017 Oct 1;173:566-572. doi: 10.1016/j.carbpol.2017.05.100. Epub 2017 Jun 3.
A two-step melt blending procedure was used to produce binary systems composed of thermoplastic starch (TPS) and poly(butylene adipate-co-terephthalate) (PBAT). To improve the properties of the blends, two different layered silicates, viz. bentonite (BT) and organically modified montmorillonite (oMMT) were incorporated. First, TPS and its layered silicate nanocomposites were prepared via extrusion compounding during which starch was plasticized with glycerol and water. In the second step, PBAT was added to TPS/layered silicate to produce blends in a batch-type mixer. Mechanical and thermal properties were determined. The blends showed acceptable ductility over 50wt.% PBAT content, although at the cost of strength and stiffness. By contrast to oMMT the BT became intercalated in TPS and TPS/PBAT blends. The reinforcing effect of BT and oMMT was most prominent for the glassy states of both TPS and TPS/PBAT blends. Thermal, and thermooxidative properties were not significantly affected by the presence of layered silicates.
采用两步熔融共混法制备了由热塑性淀粉（TPS）和聚（丁二酸丁二醇酯-对苯二甲酸酯）（PBAT）组成的二元体系。为了改善共混物的性能，加入了两种不同的层状硅酸盐，即膨润土（BT）和有机改性蒙脱土（oMMT）。首先，通过挤出共混制备 TPS 和其层状硅酸盐纳米复合材料，其中淀粉用甘油和水增塑。在第二步中，将 PBAT 添加到 TPS/层状硅酸盐中，在间歇式混合机中制备共混物。测定了力学和热性能。在 PBAT 含量超过 50wt.%的情况下，共混物具有良好的延展性，尽管其强度和刚性会有所降低。与 oMMT 不同的是，BT 在 TPS 和 TPS/PBAT 共混物中发生了插层。BT 和 oMMT 的增强效果在 TPS 和 TPS/PBAT 共混物的玻璃态下最为明显。热和热氧化性能不受层状硅酸盐存在的显著影响。
