Study on the Thermal Stabilizing Process of Layered Double Hydroxides in PVC Resin

Rao, Zhi; Li, Kaitao; Liu, Pingli; Lin, Yanjun; Lyu, Xiang

doi:10.3390/molecules28237792

Study on the Thermal Stabilizing Process of Layered Double Hydroxides in PVC Resin

Journal Article · Sun Nov 26 23:00:00 EST 2023 · Molecules

DOI:https://doi.org/10.3390/molecules28237792· OSTI ID:2311264

Rao, Zhi ^[1]; Li, Kaitao ^[2]; Liu, Pingli ^[1]; Lin, Yanjun ^[2]; ^[3]

Gandong College, Fuzhou (China)
Beijing University of Chemical Technology (China)
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Poly(vinyl chloride) (PVC) is widely used in various fields and requires the use of thermal stabilizers to enhance its thermal stability during processing because of its poor thermal stability. Layered double hydroxides (LDHs) are widely considered to be one kind of highly efficient and environmentally friendly PVC thermal stabilizer. To investigate the thermal stabilizing process of layered double hydroxides (LDHs) in PVC resin, PVC and MgAl-LDHs powders with different interlayer anions (CO₃^2-, Cl^-, and NO₃^-) were physically mixed and aged at 180 °C. The structure of LDHs at different aging times was studied using XRD, SEM, and FT-IR. The results show that the thermal stabilizing process of LDHs on PVC mainly has three stages. In the first stage, the layers of LDHs undergo a reaction with HCl, which is released during the thermal decomposition of PVC. Subsequently, the ion exchange process occurs between Cl^- and interlayer CO₃^2-, resulting in the formation of MgAl-Cl-LDHs. Finally, the layers of MgAl-Cl-LDHs react with HCl slowly. During the thermal stabilizing process of MgAl-Cl-LDHs, the peak intensity of XRD reduces slightly, and no new XRD peak emerges. It indicates that only the first step happens for MgAl-Cl-LDHs. The TG-DTA analysis of LDHs indicates that the interaction of LDHs with different interlayer anions has the following order: NO₃^- < CO₃^2- < Cl^-, according to the early coloring in the thermal aging test of PVC composites. The results of the thermal aging tests suggest that LDHs with a weak interaction between interlayer anions and layers can enhance the early stability of PVC significantly. Furthermore, the thermal aging test demonstrates that LDHs with high HCl absorption capacities exhibit superior long-term stabilizing effects on PVC resin. This finding provides a valuable hint for designing an LDHs/PVC resin with a novel structure and excellent thermal stability.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 2311264

Journal Information:: Molecules, Journal Name: Molecules Journal Issue: 23 Vol. 28; ISSN 1420-3049

Publisher:: MDPICopyright Statement

Country of Publication:: United States

Language:: English

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Study on the Thermal Stabilizing Process of Layered Double Hydroxides in PVC Resin

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