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<p>Polyvinyl chloride (PVC) exhibits significant limitations in both processing and performance due to its intrinsic thermal instability. To address this challenge, a novel trimesic acid intercalated Ca-Mg-Al-La layered double hydroxide (CMAL-TMA-LDH) was prepared as a highly efficient PVC stabilizer. The CMAL-TMA-LDH was characterized by FT-IR, TGA, Raman, XRD, and SEM. The analysis results confirmed that the deprotonated trimesate anions effectively intercalated within the CMAL-TMA-LDH framework, leading to an increase in the interlayer spacing. CMAL-TMA-LDH demonstrated excellent thermal stabilization properties when utilized as a PVC stabilizer. Congo Red tests indicated that the CMAL-TMA-LDH/PVC composite demonstrated a static thermal stability of 71&#xa0;min, significantly exceeding the 26&#xa0;min observed for the ZnSt<sub>2</sub>-3CaSt<sub>2</sub>/PVC sheet. Moreover, the CMAL-TMA-LDH/PVC composite not only delayed the onset of weight loss but also reduced the dehydrochlorination rate, thereby enhancing long-term color retention. The effective thermal stabilization is attributed to a dual Cl<sup>−</sup> capture mechanism of CMAL-TMA-LDH, involving both interlayer anion exchange within the interlayer spaces and the utilization of surface metal absorption sites. These positive results suggest that CMAL-TMA-LDH represents a promising candidate for an efficient and sustainable PVC stabilizer.</p>

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Enhancing thermal stabilization of Polyvinyl chloride by a novel trimesic acid intercalated Ca-Mg-Al-La layered double hydroxide

  • 期刊论文

  • 发表日期：

    2026年5月27日

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  • Feng Guo,
  • Ling Hu,
  • Yilin Li,
  • Ruilin Ren,
  • Haoyuan Yang,
  • Xiaowei Zhang,
  • Yanhong Hu,
  • Mingguang Chen,
  • Zhaogang Liu

摘要

Polyvinyl chloride (PVC) exhibits significant limitations in both processing and performance due to its intrinsic thermal instability. To address this challenge, a novel trimesic acid intercalated Ca-Mg-Al-La layered double hydroxide (CMAL-TMA-LDH) was prepared as a highly efficient PVC stabilizer. The CMAL-TMA-LDH was characterized by FT-IR, TGA, Raman, XRD, and SEM. The analysis results confirmed that the deprotonated trimesate anions effectively intercalated within the CMAL-TMA-LDH framework, leading to an increase in the interlayer spacing. CMAL-TMA-LDH demonstrated excellent thermal stabilization properties when utilized as a PVC stabilizer. Congo Red tests indicated that the CMAL-TMA-LDH/PVC composite demonstrated a static thermal stability of 71 min, significantly exceeding the 26 min observed for the ZnSt2-3CaSt2/PVC sheet. Moreover, the CMAL-TMA-LDH/PVC composite not only delayed the onset of weight loss but also reduced the dehydrochlorination rate, thereby enhancing long-term color retention. The effective thermal stabilization is attributed to a dual Cl− capture mechanism of CMAL-TMA-LDH, involving both interlayer anion exchange within the interlayer spaces and the utilization of surface metal absorption sites. These positive results suggest that CMAL-TMA-LDH represents a promising candidate for an efficient and sustainable PVC stabilizer.