Planta Piloto de Ingeniería Química, PLAPIQUI (UNS-CONICET), Departamento de Ingeniería Química, Universidad Nacional del Sur (UNS), Camino "La Carrindanga" Km 7, 8000 Bahía Blanca, Argentina.
Planta Piloto de Ingeniería Química, PLAPIQUI (UNS-CONICET), Departamento de Ingeniería Química, Universidad Nacional del Sur (UNS), Camino "La Carrindanga" Km 7, 8000 Bahía Blanca, Argentina.
Carbohydr Polym. 2015 Dec 10;134:205-12. doi: 10.1016/j.carbpol.2015.08.007. Epub 2015 Aug 6.
Final properties of two thermoplastic corn starch matrices were improved by adding poly(ɛ-caprolactone), PCL, at 2.5, 5, and 10% w/w. One of the thermoplastic starch matrices was processed using water and glycerol as plasticizers (SG) and the other one was plasticized with a mixture of glycerol and sodium alginate (SGA). Blends were suitably processed by melt mixing and further injected. Films obtained by thermo-compression were flexible and easy to handle. Microstructure studies (SEM and FTIR) revealed a nice distribution of PCL within both matrices and also a good starch-PCL compatibility, attributed to the lower polyester concentration. The crystalline character of PCL was the responsible of the increment in the degree of crystallinity of starch matrices, determined by XRD. Moreover, it was demonstrated by TGA that PCL incorporation did not affect the thermal stability of these starch-based materials. In addition, a shift of Tg values of both glycerol and starch-rich phases to lower values was determined by DSC and DMA tests, attributed to the PCL plasticizing action. Besides, PCL blocking effect to visible and UV radiations was evident by the incremented opacity and the UV-barrier capacity of the starch films. Finally, water vapor permeability and water solubility values were reduced by PCL incorporation.
通过添加聚（ε-己内酯）（PCL），将两种热塑性玉米淀粉基质的最终性能提高到 2.5、5 和 10%w/w。其中一种热塑性淀粉基质使用水和甘油作为增塑剂（SG）加工，另一种使用甘油和海藻酸钠的混合物进行增塑（SGA）。共混物通过熔融混合进行适当加工，并进一步进行注塑。通过热压获得的薄膜具有柔韧性，易于处理。微观结构研究（SEM 和 FTIR）表明，PCL 在两种基质中分布均匀，淀粉-PCL 相容性良好，这归因于较低的聚酯浓度。PCL 的结晶特性是导致淀粉基质结晶度增加的原因，这是通过 XRD 确定的。此外，通过 TGA 证明，PCL 的掺入不会影响这些基于淀粉的材料的热稳定性。此外，通过 DSC 和 DMA 测试确定，PCL 的加入使甘油和富含淀粉的相的 Tg 值向较低值移动，这归因于 PCL 的增塑作用。此外，淀粉膜的不透明度和 UV 阻隔能力的增加表明 PCL 对可见光和紫外线辐射具有阻隔作用。最后，PCL 的加入降低了水蒸气透过率和水溶性。
