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DIFFERENT TYPE OF IRRADIATION EFFECTS ON TWO POLY(ETHYLENE-TEREPHTALATE) NANOCOMPOSITES

The radiation response of polymers and (nano)composites depends on the chemical structure of the polymer matrix and the type of radiation. The distribution of reactive species in the polymer depends on linear energy transfer rate of a corresponding radiation type. The overall outcome can be degradation, cross-linking and/or latent track formation. Polyethylele terephtalate (PET) is widely used thermoplastic polymer with excellent engineering properties and its radiation stability is relatively high and can be increased by addition of appropriate (nano)fillers [1]. Two PET nanocomposites, one containing nano-diamonds (ND) and the other combination of nano-diamonds and graphene nanoplatelets (NGP) [2] were studied. DSC showed that the crystallinity of PET was just minimally affected by introduction of nanofillers. Pure PET and the nanocomposites were irradiated with gamma radiation, high energy protons and UV radiation. DSC thermograms of irradiated samples revealed that ordered amorphous phase was more influenced than its mobile segment and crystalline was the least affected. Various irradiation types produced different outcomes. Only slight changes were observed in PET and the nanocomposites irradiated up to 0.5 MGy with gamma irradiation. Proton irradiation produced much more damage. Graphene containing nanocomposite was more resistant to proton irradiation than the one containing only nano- diamonds. On the other hand UV radiation produced the most significant degradation in all samples and particularly in graphene containing nanocomposite. References [1] Wypych, G. ; Handbook of Fillers, 2nd ed., ChemTec Pub-lishing, Toronto (2000), pp. 485–495, 501–505. [2] Bistričić, L. , Borjanović, V., Leskovac, M., Mikac, L., McGuire, G.E., Shenderova, O., Nunn, N. Journal of Polymer Research 22(3), 2015, 12 p (published online).

poly(ethylene terphtalate); nanodiamonds; graphene; proton beam; gamma-irradiation; UV-irradiation; thermal analysis; ordered amorphous phase

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