Abstract
Flame retardant polylactic acid (PLA) composites were prepared and studied using melamine phosphate (MP) as an intumescent flame retardant and organophilic alpha-zirconium phosphate (OZrP) as a synergistic agent. The flammability properties of PLA composites were investigated by UL-94 tests and microscale combustion calorimetry (MCC) experiments. It’s found that the incorporation of organically modified layered OZrP can further improve the flame retardancy of PLA composites and there exists an optimum content of OZrP. The SEM results about the char indicate that more homogeneous and compact char were formed with OZrP. In addition, the effect of OZrP on thermal degradation process of PLA composites was analyzed using in situ FTIR. The results show that the addition of OZrP decreases the onset decomposition temperature, but increases thermal stability at high temperature.
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