DEGRADATION STUDY OF HIGH MELT STRENGTH POLYPROPYLENE/CLAY NANOCOMPOSITES IN ENVTRONMENTAL AND ACCELERATED CONDITIONS

摘要

The Polypropylene (PP) was initially modified by y radiation or high melt strength PP. HMS-PP/ Cloisite 20 nanocomposites processed by melt mixing in twin-screw extruder derived samples to evaluate under environmental and thermal degradation conditions. PP-g-MA was the compatibihzing agent. The tests were conducted on dumbbell shaped samples under two different ageing conditions of degradation: environmental exposition and accelerated exposition. The morphology of aged samples was evaluated by XRD. TEM microscopy showed intercalation and exfoliation. Thermal degradation was studied by TGA. The DSC and the results showed decrease of melting point and increased crystallization under ageing conditions. The FTIR results showed the increase of carbonyl index related to the surface oxidation of the nanocomposites.