Aliphatic–aromatic copolyester/oxidized starch blends were formulated using different copolyester proportions and a constant starch–plasticizer ratio. After homogeneity evaluation, the samples were subjected to mechanical and thermal analyses. Subsequently, biodegradability evaluation under sandy loam garden soil was performed. The results showed that tensile strength, Young’s modulus and elongation at break presented a proportional increase with copolyester content. Differential scanning calorimetry analysis evidenced that the blend composition has no important influence on the glass transition temperature. The biodegradability tests showed a proportional relation between the amount of modified starch in the formulations and their degradation. Moreover, samples with a higher mass loss exhibited greater color changes, which indicate the microorganisms’ activity.

中文翻译：

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基于共聚酯和改性香蕉淀粉的生物聚合物：性能方法

脂肪族-芳香族共聚酯/氧化淀粉共混物使用不同的共聚酯比例和恒定的淀粉-增塑剂比例配制而成。均匀性评估后，对样品进行机械和热分析。随后，在砂壤土花园土壤下进行了生物降解性评价。结果表明，拉伸强度、杨氏模量和断裂伸长率随共聚多酯含量呈比例增加。差示扫描量热分析证明共混物组成对玻璃化转变温度没有重要影响。生物降解性测试表明配方中改性淀粉的量与其降解之间存在比例关系。此外，质量损失较高的样品表现出更大的颜色变化，