Abstract

Starch was extracted from potato (Solanum tuberosum) cultivated in Nepal. The yield of starch of different sorts of the species S. tuberosum was compared with each other. Extracted starch (E St.) Kufre Sindure was characterized and compared with commercial starch (Com St.) by the Fourier transform infrared spectroscopy (FTIR). The properties of extracted starch were evaluated by measuring ash content, moisture content and amylose content. A series of butylene adipate-co-terephthalate (PBAT)/TPS blend of varying concentration (5%, 10%, 20% and 30%) were prepared using citric acid (compatibilizer) and glycerol as plasticizer, respectively, via solution casting method. The physical and chemical properties of resulting blends were characterized by FTIR and X-ray photoelectron spectroscopy (XPS). The FTIR results proved the esterification reaction between PBAT, thermoplastic starch (TPS) and citric acid in blends. Morphology of the PBAT/TPS film was studied through scanning electron microscopy (SEM) and XPS analysis. Microindentation measurements revealed improvement in mechanical properties of PBAT with the loading of starch. Thermogravimetric analysis (TGA) showed decrease in the thermal stability of PBAT/TPS blend. Degradation behavior of blend showed that rate of degradation was increased with increase of starch content.

摘要

淀粉是从尼泊尔种植的马铃薯（Solanum tuberosum）中提取的。比较了不同种类马铃薯的淀粉产量。提取淀粉 (E St.) Kufre Sindure 通过傅里叶变换红外光谱 (FTIR) 进行表征并与商业淀粉 (Com St.) 进行比较。通过测定灰分、水分和直链淀粉含量来评价提取淀粉的性质。一系列丁烯己二酸酯的合作分别使用柠檬酸（增容剂）和甘油作为增塑剂，通过溶液浇铸法制备了不同浓度（5%、10%、20% 和 30%）的对苯二甲酸酯 (PBAT)/TPS 混合物。所得共混物的物理和化学性质通过 FTIR 和 X 射线光电子能谱 (XPS) 进行表征。FTIR 结果证明了 PBAT、热塑性淀粉 (TPS) 和柠檬酸在混合物中的酯化反应。通过扫描电子显微镜 (SEM) 和 XPS 分析研究了 PBAT/TPS 膜的形态。显微压痕测量表明，随着淀粉的加入，PBAT 的机械性能得到了改善。热重分析 (TGA) 显示 PBAT/TPS 混合物的热稳定性降低。