Surface-functionalized layered double hydroxides (LDHs) nanoplatelets for enhanced thermal stability of plasticized polyvinyl chloride (PVC) films

作者：Hossein Ipakchi, Kushal Panchal, Roozbeh Mafi, Li Xi · 发表于：Chemical Engineering Journal · 年份：2025 · DOI：10.1016/j.cej.2025.161430 · 被引用次数：19 · 研究领域：Polymer Science and PVC、biodegradable polymer synthesis and properties、Polymer Nanocomposites and Properties

• Oleic acid is investigated as a surface modifier for LDH-based PVC stabilizers. • PVC processed with modified LDHs shows enhanced thermal stability. • Oleic acid improves both LDH dispersion and its affinity with the PVC matrix. • PVC degradation and polyene formation are suppressed. Polyvinyl chloride (PVC) is the third most produced plastic globally and a significant contributor to plastic waste. Thermal stabilizers are essential for PVC processing to prevent degradation, a role that becomes even more critical in recycling techniques where repeated reprocessing exacerbates degradation issues. Recent studies have explored layered double hydroxides (LDHs) as promising PVC stabilizers, offering a balance between stabilization efficiency, environmental impact, and cost. However, achieving effective compatibilization with PVC remains a challenge. In this study, we provide mechanistic insights into LDH stabilization by proposing a four-stage reaction mechanism during PVC degradation. This mechanism highlights the roles of interlayer anions, the interactions of basic metal components (Mg, Zn, Al), and the contribution of each element to LDH’s acid-neutralizing capabilities in suppressing HCl release. Raman spectroscopy confirmed that Zn contributes the most to HCl absorption due to its higher electronegativity and affinity for HCl, while Mg exhibits a delayed interaction, and Al contributes at later stages, indicating a progressive role in stabilization. To further enhance LDH s...