Planta Piloto de Ingeniería Química, PLAPIQUI (UNS-CONICET), Departamento de Ingeniería Química, UNS, Camino La Carrindanga km 7, 8000 Bahía Blanca, Argentina.
Centro de Investigación y Desarrollo en Criotecnología de Alimentos, CIDCA (UNLP-CONICET), Facultad de Ciencias Exactas, UNLP, 47 y 116, 1900 La Plata, Argentina.
Carbohydr Polym. 2015 Dec 10;134:324-32. doi: 10.1016/j.carbpol.2015.07.081. Epub 2015 Jul 31.
Biocomposites films based on thermoplastic corn starch (TPS) containing 0.5% w/w fibrous residue from Pachyrhizus ahipa starch extraction (PASR) were obtained by melt-mixing and compression molding. PASR is mainly constituted by remaining cell walls and natural fibers, revealed by Scanning Electron Microscopy (SEM). Chemical composition of the residue indicated that fiber and starch were the principal components. Biocomposites thermo-stability was determined by Thermo-Gravimetric Analysis. A continuous PASR-TPS interface was observed by SEM, as a result of a good adhesion of the fibrous residue to starch matrix. Likewise, films containing PASR presented fewer superficial cracks than TPS ones, whereas their fracture surfaces were more irregular. Besides, the presence of PASR increased starch films roughness, due to fibers agglomerates. Films reinforced with PASR showed significantly lower water vapor permeability (WVP). In addition, PARS filler increased maximum tensile strength and Young's modulus of TPS films, thus leading to more resistant starch matrixes.
基于热塑性玉米淀粉（TPS）的生物复合材料薄膜，含有 0.5%w/w 的从刺槐豆淀粉提取（PASR）的纤维残余物，通过熔融混合和压缩成型获得。扫描电子显微镜（SEM）显示，PASR 主要由剩余的细胞壁和天然纤维组成。残渣的化学成分表明纤维和淀粉是主要成分。热重分析（TGA）确定了生物复合材料的热稳定性。SEM 观察到 PASR-TPS 界面连续，这是由于纤维残余物与淀粉基质之间具有良好的附着力。同样，含有 PASR 的薄膜比 TPS 薄膜表面出现的裂缝更少，而其断裂面更不规则。此外，由于纤维团聚，PASR 的存在增加了淀粉薄膜的粗糙度。PASR 增强的薄膜表现出显著降低的水蒸气透过率（WVP）。此外，PARS 填充剂增加了 TPS 薄膜的最大拉伸强度和杨氏模量，从而使淀粉基质更具抗性。
