Development and synthesis of anti-zinc burn and antibacterial Schiff base zinc complexes as multi-functional thermal stabilizers for PVC formulations

IF 3.6 4区工程技术 Q2 CHEMISTRY, APPLIED

Journal of Vinyl & Additive Technology Pub Date : 2025-01-21 DOI:10.1002/vnl.22193

Nan Wang, Pingping Jiang, Pingbo Zhang, Xue Mei, Xiaoyuan Zhu, Shijun Chen, Xunxun Sheng, Jingang Gao, Hang Gao

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引用次数: 0

Abstract

Polyvinyl chloride (PVC) thermal stabilizers are evolving toward greater efficiency and multifunctionality. This study aims to develop a multifunctional thermal stabilizer to meet the diverse application requirements. A Schiff base, VanHis, was synthesized by condensing histidine with vanillin, and its zinc salt derivative, VanHis-Zn, was prepared by reacting VanHis with anhydrous zinc acetate. Infrared spectroscopy, proton nuclear magnetic resonance spectroscopy, and thermogravimetric analysis confirmed the successful synthesis. Thermal stability tests, including oven aging, thermogravimetric, conductivity, and Congo red tests, were conducted. Results showed that VanHis-Zn delayed zinc burn, with complete discoloration occurring after 120 min. Compared to commercially available calcium/zinc stearate stabilizers, VanHis-Zn exhibited the lowest weight loss rates in both the first (72.26%) and second (17.21%) stages. Additionally, dynamic mechanical analysis (DMA) and UV-absorption spectroscopy confirmed that VanHis-Zn suppressed the formation of conjugated double bonds during PVC thermal degradation. When blended with varying proportions of Ca(acac)₂, the initial whiteness and long-term thermal stability of PVC samples improved significantly, doubling the stability time compared to conventional systems. Antibacterial tests also demonstrated that both VanHis-Zn and the blended PVC samples exhibited antibacterial properties. Quantum chemical calculations were performed to analyze the thermal stabilization mechanism using NPA charge distribution analysis.

Highlights

VanHis-Zn from biomass enhances PVC stability under heat and delays zinc burning.
VanHis-Zn imparts antibacterial properties and inhibits PVC conjugated bond formation.
Thermal stability mechanism analyzed via quantum chemical and NPA charge analysis.

Abstract Image

查看原文本刊更多论文

抗锌烧伤和抗菌希夫碱锌配合物的研制与合成

聚氯乙烯（PVC）热稳定剂正朝着更高的效率和多功能性发展。本研究旨在开发一种多功能热稳定剂，以满足不同的应用需求。以组氨酸与香兰素缩合为原料合成了希夫碱VanHis，并与无水乙酸锌反应制备了其锌盐衍生物VanHis- zn。红外光谱、质子核磁共振光谱和热重分析证实了合成成功。热稳定性测试，包括烘箱老化、热重、电导率和刚果红测试。结果表明，VanHis-Zn延缓了锌烧伤，在120 min后完全变色。与市售的硬脂酸钙/锌稳定剂相比，VanHis-Zn在第一阶段（72.26%）和第二阶段（17.21%）均表现出最低的失重率。此外，动态力学分析（DMA）和紫外吸收光谱证实了VanHis-Zn在PVC热降解过程中抑制了共轭双键的形成。当与不同比例的Ca(acac)2混合时，PVC样品的初始白度和长期热稳定性显著提高，与常规体系相比，稳定时间增加了一倍。抗菌试验还表明，VanHis-Zn和混合PVC样品均具有抗菌性能。利用NPA电荷分布分析，进行了量子化学计算，分析了热稳定机理。强调从生物质中提取的VanHis-Zn提高PVC在高温下的稳定性，并延迟锌的燃烧。VanHis-Zn赋予抗菌性能并抑制PVC共轭键的形成。通过量子化学和NPA电荷分析分析了热稳定性机理。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Vinyl & Additive Technology 工程技术-材料科学：纺织

CiteScore

5.40

自引率

14.80%

发文量

审稿时长

>12 weeks

期刊介绍： Journal of Vinyl and Additive Technology is a peer-reviewed technical publication for new work in the fields of polymer modifiers and additives, vinyl polymers and selected review papers. Over half of all papers in JVAT are based on technology of additives and modifiers for all classes of polymers: thermoset polymers and both condensation and addition thermoplastics. Papers on vinyl technology include PVC additives.