Abstract
Novel intumescent flame retardant polylactic acid (PLA) composites containing different melamine polyphosphate (MPP)/pentaerythritol (PER) and organicmodified montmorillonite (OMT) formulations have been prepared and studied. The synthetic Fe-montmorillonite (Fe-MMT) and natural Na-montmorillonite (Na-MMT) are chosen and modified by hexadecyltrimethylammonium bromide (CTAB). The flammability properties of PLA composites are investigated by UL-94 tests, limited oxygen index (LOI) and microscale combustion calorimetry (MCC) experiments. It’s found that the incorporation of organically modified layered silicate can further improve the flame retardancy of PLA composites, and Fe-OMT is more effective than Na-OMT. In addition, the effect of OMT on thermal degradation stability of PLA composites is analyzed using thermogravimetric analysis (TGA). The results show the addition of Fe-OMT decreases the onset decomposition temperature, but remarkably increases the char residue.
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