Volume 140, Issue 5 e53411
RESEARCH ARTICLE

Sustained antioxidant properties of epigallocatechin gallate loaded halloysite for PLA as potentially durable materials

Zhongyang Yao

Zhongyang Yao

Shanghai Key Laboratory of Multiphase Material Chemical Engineering, Department of Product Engineering, East China University of Science and Technology, Shanghai, China

Contribution: Conceptualization (equal), Data curation (lead), Formal analysis (lead), ​Investigation (lead), Methodology (lead), Software (equal), Validation (equal), Visualization (lead), Writing - original draft (lead), Writing - review & editing (equal)

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Weiguang Gong

Weiguang Gong

Research and Development Center for Sports Materials, East China University of Science and Technology, Shanghai, China

Contribution: Conceptualization (supporting), Methodology (supporting), Resources (supporting), Supervision (supporting)

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Chenyang Li

Chenyang Li

Shanghai Key Laboratory of Multiphase Material Chemical Engineering, Department of Product Engineering, East China University of Science and Technology, Shanghai, China

Contribution: Conceptualization (supporting), Methodology (supporting), Software (supporting), Supervision (supporting), Validation (equal)

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Zhaopeng Deng

Zhaopeng Deng

Shanghai Key Laboratory of Multiphase Material Chemical Engineering, Department of Product Engineering, East China University of Science and Technology, Shanghai, China

Contribution: Conceptualization (supporting), Methodology (supporting), Software (supporting), Validation (supporting)

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Yi Jin

Yi Jin

Key Laboratory for Polymerization Engineering and Technology of Ningbo, College of Materials and Chemical Engineering, Ningbo University of Technology (NBUT), Ningbo, China

Contribution: Methodology (supporting)

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Xin Meng

Corresponding Author

Xin Meng

Shanghai Key Laboratory of Multiphase Material Chemical Engineering, Department of Product Engineering, East China University of Science and Technology, Shanghai, China

Correspondence

Xin Meng, Shanghai Key Laboratory of Multiphase Material Chemical Engineering, Department of Product Engineering, East China University of Science and Technology, Shanghai 200237, China.

Email: [email protected]

Contribution: Conceptualization (equal), Funding acquisition (lead), Methodology (equal), Resources (lead), Supervision (equal), Validation (equal), Writing - review & editing (equal)

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First published: 26 November 2022

Funding information: Ningbo Public Welfare Science and Technology Projects, Grant/Award Number: 2021S09

Abstract

Halloysite nanotube (HNT) was etched by hydrochloric acid, and epigallocatechin gallate (EGCG) was loaded into the etched HNT (HH) to prepare loaded antioxidant (HH-E) for polylactic acid (PLA) with improved thermal-oxidative stability. The loading process was confirmed by TGA and FT-IR, and the loading capacity was 16.15%. The presence of EGCG on the surface of etched HNT was further confirmed by nitrogen adsorption and TEM. The effect of loaded EGCG on thermal-oxidative stability of PLA was characterized by the change in OOT values of PLA after the aging process under 140°C. The results showed that HH-E increased OOT values of PLA from 231.2°C to 293.6°C at first, indicating that HH-E provided PLA with excellent thermal-oxidative stability. Furthermore, as can be seen from the trend of OOT changing over aging time, during the 14 days aging process, OOT values of PLA composites with HH-E decreased more slowly than that of PLA composites with EGCG alone, endowing PLA with sustainable thermal-oxidative stability. Further kinetic analysis showed that the apparent activation energy of the degradation process (Ea) of PLA composites with HH-E changed less than that of PLA composites with EGCG alone, which showed that the loading system provided PLA better sustainable stability. Moreover, the isothermal crystallization process of modified PLA was characterized by DSC and POM. The results showed that HH-E provided heterogeneous crystal nucleus for PLA, reducing the half crystallization time (t0.5) and improvement of crystallization rate for PLA. These results prove that HH-E exhibited excellent performance in improving the thermal stability and crystallization property of PLA, showing multifunctional characterization.

DATA AVAILABILITY STATEMENT

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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