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Gamma irradiation resistance of LDPE can be improved by addition of polypyrrole


Polypyrrole is a widely used conductive polymer. Polypyrrole can be added into other polymer matrix to achieve improved flexibility. The lifetime of the resulting composite depends largely on the oxidation strength of host material, on the presence of additives, which play the role of degradation protectors, on the intensity and the duration of stressor action. Addition of antioxidants helps even at 5% level in LDPE, as they greatly eliminate decomposition. They do not completely eliminate oxidative degradation, but they markedly diminish the rate of auto-oxidation by interfering with radical propagation process. Polypyrrole presents a significant action on the retarding oxidation by the scavenging peroxyl radical after the formation of pyrryl radicals.

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