Green methods of modification, such as ozone, can bring new functionalities to starch. In this study, starch-based plastics were produced by extrusion, using cassava starch ozonated with a gas flow of 1 L min⁻¹ at a concentration of 41 mg O₃ L⁻¹ resulting in doses of 78.9 and 145.3 mg O₃/g starch. Pre-mixes (starch, glycerol, and water) were processed in a co-rotating twin-screw extruder. The main results showed that ozonated sheet produced with the treatment of 78.9 mg O₃/g starch resulted in an increase in Young Modulus by 43% and a decrease in hydrophilicity by 37% in comparison to the native one. Conversely, treatment with 145.3 mg O₃/g starch did not increase the bio-based plastic mechanical properties or surface characteristics, showing a specific behavior tendency between ozonation and extrusion processes. The ozonation of starch showed to be an alternative for producing by extrusion bio-based plastics with enhanced properties, by selecting adequate processing conditions.

Graphical Abstract

中文翻译：

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基于臭氧化木薯淀粉的生物基塑料通过挤压生产

绿色的改性方法，如臭氧，可以为淀粉带来新的功能。在这项研究中，淀粉基塑料是通过挤压生产的，使用木薯淀粉在 41 mg O ₃  L ^{-1的气体流量下臭氧化}，产生 78.9 和 145.3 mg O ₃ /g的剂量淀粉。预混物（淀粉、甘油和水）在同向旋转双螺杆挤出机中加工。主要结果表明，与天然的相比，用 78.9 mg O ₃ /g 淀粉处理生产的臭氧化片材导致杨氏模量增加 43%，亲水性降低 37%。相反，用 145.3 mg O _3处理/g淀粉没有增加生物基塑料的机械性能或表面特性，在臭氧化和挤出过程之间表现出特定的行为趋势。通过选择适当的加工条件，淀粉的臭氧化被证明是一种通过挤出生产具有增强性能的生物基塑料的替代方法。

图形概要