Enhancement of thermal stability, UV barrier, biodegradability, and moisture resistance of potato starch–agar bioplastics using biogenic TiO2 nanoparticles

IF 5 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Polymer Testing Pub Date : 2025-05-29 DOI:10.1016/j.polymertesting.2025.108868

David Asmat-Campos , Meliza Lindsay Rojas , Angel Carreño-Ortega , Noemi Raquel-Checca

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引用次数: 0

Abstract

This study evaluated the influence of biogenically synthesized TiO₂ nanoparticles (NPs) on the structure, properties, and biodegradability of bioplastics made from potato starch and agar. TiO₂ NPs (13.41 ± 1.0 nm, crystalline structure confirmed by X-ray diffraction) were incorporated at 0.674 %, 0.506 %, and 0.434 % concentrations. EDS and X-ray fluorescence confirmed their presence in the bioplastic matrix, while FTIR and Raman spectroscopy revealed interactions with polymer functional groups. TiO₂ addition reduced transparency from 79.1 % (control) to 46.81 % and improved UV-blocking capacity (68.7 % UV-A, 79.1 % UV-B). Water absorption decreased, indicating lower moisture affinity. Thermally, the 0.506 % NP sample showed superior stability with a decomposition temperature of 318.52 °C. Tensile strength decreased from 7.459 MPa (control) to 4.873 MPa, likely due to NP distribution and agglomeration. Biodegradability tests showed 52–60 % degradation in seawater (15 days) and over 76 % in soil (28 days), with the 0.506 % NP sample reaching the highest degradation (79.7 %). These findings highlight TiO₂ NPs’ potential to enhance thermal stability, UV protection, moisture resistance, and biodegradability in sustainable bioplastics.

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利用生物源TiO2纳米颗粒增强马铃薯淀粉-琼脂生物塑料的热稳定性、紫外线阻隔性、生物降解性和防潮性

本研究评估了生物合成二氧化钛纳米颗粒（NPs）对马铃薯淀粉和琼脂制备的生物塑料的结构、性能和生物降解性的影响。TiO2 NPs（13.41±1.0 nm， x射线衍射证实为晶体结构）的浓度分别为0.674%、0.506%和0.434%。EDS和x射线荧光证实了它们在生物塑料基质中的存在，而FTIR和拉曼光谱显示了它们与聚合物官能团的相互作用。TiO2的加入将透明度从79.1%（对照组）降低到46.81%，并提高了紫外线阻挡能力（68.7% UV-A, 79.1% UV-B）。吸水率降低，表明亲水性降低。热稳定性方面，0.506% NP样品在318.52℃的分解温度下表现出优异的稳定性。抗拉强度从7.459 MPa（对照）下降到4.873 MPa，可能是由于NP分布和团聚。生物降解性试验表明，在海水中（15 d）降解52 - 60%，在土壤中（28 d）降解76%以上，其中0.506% NP样品的降解率最高（79.7%）。这些发现突出了TiO2 NPs在可持续生物塑料中提高热稳定性、防紫外线、耐湿气性和生物降解性的潜力。

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来源期刊

Polymer Testing 工程技术-材料科学：表征与测试

CiteScore

10.70

自引率

5.90%

发文量

328

审稿时长

44 days

期刊介绍： Polymer Testing focuses on the testing, analysis and characterization of polymer materials, including both synthetic and natural or biobased polymers. Novel testing methods and the testing of novel polymeric materials in bulk, solution and dispersion is covered. In addition, we welcome the submission of the testing of polymeric materials for a wide range of applications and industrial products as well as nanoscale characterization. The scope includes but is not limited to the following main topics: Novel testing methods and Chemical analysis • mechanical, thermal, electrical, chemical, imaging, spectroscopy, scattering and rheology Physical properties and behaviour of novel polymer systems • nanoscale properties, morphology, transport properties Degradation and recycling of polymeric materials when combined with novel testing or characterization methods • degradation, biodegradation, ageing and fire retardancy Modelling and Simulation work will be only considered when it is linked to new or previously published experimental results.