Study of Synergistic Effects of Cerium Oxide on Intumescent Flame Retardant Polypropylene System

Abstract:

Melamine salt of pentaerythritol phosphate (PPM) was synthesized with phosphoric acid, pentaerythritol and melamine. This flame retardant polypropylene containing cerium oxide (CeO₂) can be used as a synergistic agent for the flame retardancy of intumescent flame retardant polypropylene system. The pendulum impact tester and universal material machine were used to evaluate the mechanical properties of intmescent flame retardant system, the limiting oxygen index (LOI), thermogravimetric analysis (TGA) and scanning electron microscopy (SEM) were used to evaluate the synergistic effects of CeO₂. The LOI value of the system increased when reasonable amount of CeO₂ was added, and it reached maximum (30%) when the mass fraction of PPM was 20% and CeO₂ added was 1% of the PPM/PP system. The TGA data shows that CeO₂ can enhance the thermal stability of the intumescent flame retardant polypropylene system at high temperature and effectively increase the char residue formation. The morphological structures observed with SEM demonstrate that reasonable amount of CeO₂ can improve the morphologies of intumescent char layer and the properties of heat insulation and barrier material. The reasonable amount of CeO₂ in the system can increase its impact strength and decrease its tensile properties.

• Periodical: Advanced Materials Research (Volumes 887-888)
• Pages: 90-93
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.887-888.90
• Online since: February 2014
• Authors: Ya Li Wang, Xiao Ping Tang, Xu Dong Tang*
• Keywords: Cerium Oxide, Intumescent Flame Retardant, Polypropylene (PP), Synergistic Effect

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