Kahvand Fatemeh, Fasihi Mohammad
School of Chemical, Petroleum and Gas Engineering, Iran University of Science and Technology, Tehran, Iran.
School of Chemical, Petroleum and Gas Engineering, Iran University of Science and Technology, Tehran, Iran.
Int J Biol Macromol. 2020 Aug 15;157:359-367. doi: 10.1016/j.ijbiomac.2020.04.222. Epub 2020 Apr 27.
Thermoplastic starch (TPS) foams was prepared by melt extrusion process and the effects of polyvinyl alcohol (PVA) and glycerol/water plasticizer contents on the physical and cellular properties of these foams were investigated. All TPS/PVA blended foams showed more uniform cellular morphology, lower density and higher cell density than the TPS foam. The density of TPS foam decreased about 70%, and cell density increased up to 60-fold by adding 20% PVA. In addition to the positive effect of the PVA on improving processability and cellular uniformity, it also acted as a polymeric plasticizer and adding it allowed to decrease another low molecular weight plasticizer content in TPS/PVA blends. As a result by statistical analysis significant improvements in expansion ratio (256%), cell density (60 times), and lower moisture absorption (60%) were achieved.
通过熔融挤出工艺制备了热塑性淀粉（TPS）泡沫，并研究了聚乙烯醇（PVA）以及甘油/水增塑剂含量对这些泡沫物理性能和泡孔性能的影响。与TPS泡沫相比，所有TPS/PVA共混泡沫均呈现出更均匀的泡孔形态、更低的密度和更高的泡孔密度。通过添加20%的PVA，TPS泡沫的密度降低了约70%，泡孔密度增加了60倍。除了PVA对改善加工性能和泡孔均匀性具有积极作用外，它还充当聚合物增塑剂，添加PVA可降低TPS/PVA共混物中另一种低分子量增塑剂的含量。统计分析结果表明，发泡倍率（提高256%）、泡孔密度（提高60倍）和较低的吸湿性（降低60%）均有显著改善。
