Planta Piloto de Ingeniería Química, PLAPIQUI (UNS-CONICET), Departamento de Ingeniería Química, UNS, Camino La Carrindanga km. 7, 8000 Bahía Blanca, Argentina.
Carbohydr Polym. 2013 Jun 20;95(2):664-74. doi: 10.1016/j.carbpol.2013.03.026. Epub 2013 Mar 18.
Nanocomposite films of thermoplastic corn starch (TPS) with talc particles were obtained by thermo-compression in order to study the effect of filler on structure, optical, and thermal properties. Talc increased the films rigid phase, thus their cross-sections resulted more irregular. Talc preferential orientation within matrix and good compatibility between particles and TPS was observed by SEM. Slight crystalline structure changes in TPS matrix were measured by XRD and DSC, due to talc nucleating effect. Randomly dispersed talc nanoagglomerates and individual platelets were assessed by TEM. Laminar morphology and nano-sized particles allowed that nanocomposite films were optically transparent. TPS-talc films resulted heterogeneous materials, presenting domains rich in glycerol and others rich in starch. Talc incorporation higher than 3%, w/w increased softening resistance of the nanocomposites as stated by DMA. Relaxation temperatures of glycerol-rich phase shifted to higher values since talc reduces the mobility of starch chains.
为了研究填充剂对结构、光学和热性能的影响，通过热压法获得了热塑性玉米淀粉（TPS）与滑石颗粒的纳米复合薄膜。滑石增加了薄膜的刚性相，因此其横截面变得更加不规则。SEM 观察到滑石在基体中的择优取向和颗粒与 TPS 之间的良好相容性。XRD 和 DSC 测量表明，由于滑石的成核作用，TPS 基体的结晶结构略有变化。TEM 评估了随机分散的滑石纳米团聚体和单个薄片。层状形态和纳米级颗粒使纳米复合材料具有光学透明性。TPS-滑石薄膜是不均匀的材料，存在富含甘油的区域和富含淀粉的区域。DMA 表明，当滑石的含量高于 3%（w/w）时，纳米复合材料的软化阻力增加。由于滑石降低了淀粉链的迁移率，富含甘油的相的松弛温度向更高的值移动。
