Laboratory of Plastics and Rubber Technology, Department of Physical Chemistry and Materials Science, Budapest University of Technology and Economics, PO Box 91, H-1521 Budapest, Hungary; Institute of Materials and Environmental Chemistry, Research Centre for Natural Sciences, Hungarian Academy of Sciences, PO Box 17, H-1525 Budapest, Hungary.
Laboratory of Plastics and Rubber Technology, Department of Physical Chemistry and Materials Science, Budapest University of Technology and Economics, PO Box 91, H-1521 Budapest, Hungary; Institute of Materials and Environmental Chemistry, Research Centre for Natural Sciences, Hungarian Academy of Sciences, PO Box 17, H-1525 Budapest, Hungary.
Carbohydr Polym. 2014 Nov 26;113:569-76. doi: 10.1016/j.carbpol.2014.07.054. Epub 2014 Jul 30.
TPS/Na-montmorillonite nanocomposite films were prepared by solution and melt blending. Clay content changed between 0 and 25 wt% based on the amount of dry starch. Structure, tensile properties, and water content of wet conditioned films were determined as a function of clay content. Intercalated structure and VH-type crystallinity of starch were found for all the nanocomposites independently of clay and plasticizer content or preparation method, but at larger than 10 wt% clay content nanocomposites prepared by melt intercalation contained aggregated particles as well. In spite of the incomplete exfoliation clay reinforces TPS considerably. Preparation method has a strong influence on mechanical properties of wet conditioned films. Mechanical properties of the conditioned samples prepared by solution homogenization are much better than those of nanocomposites prepared by melt blending. Water, which was either adsorbed or bonded in the composites in conditioning or solution mixing process, respectively, has different effect on mechanical properties.
通过溶液和熔融共混制备了 TPS/Na-蒙脱石纳米复合材料薄膜。基于干淀粉的量，粘土含量在 0 到 25wt%之间变化。作为粘土含量的函数，确定了结构、拉伸性能和湿调节薄膜的含水量。所有纳米复合材料都表现出插层结构和 VH 型结晶度，与粘土和增塑剂含量或制备方法无关，但在大于 10wt%的粘土含量下，通过熔融插层制备的纳米复合材料也含有聚集的颗粒。尽管插层不完全，但粘土对 TPS 的增强作用非常显著。制备方法对湿调节薄膜的力学性能有很大影响。通过溶液均化制备的调节样品的力学性能远优于通过熔融共混制备的纳米复合材料。在调节或溶液混合过程中分别吸附或键合在复合材料中的水对力学性能有不同的影响。
