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The role of physical structure and morphology on the photodegradation behaviour of polypropylene-graphene oxide nanocomposites
Ist Teil von
Polymer (Guilford), 2019-08, Vol.176, p.146-158
Ort / Verlag
Kidlington: Elsevier Ltd
Erscheinungsjahr
2019
Link zum Volltext
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
In this work, for the first time, the effect of graphene oxide on the photodegradation behaviour of polypropylene-graphene oxide nanocomposites is presented. The graphene oxide was characterised, and AFM images show that the GO can be classified as multilayer-GO (mGO). Based on previous work, two new methods were used, liquid-phase feeding (LPF) and solid-solid deposition (SSD), to insert pre-exfoliated mGO into the polymer matrix. Moreover, the morphology and structure of the nanocomposites were analysed using an optical microscope, rheological and dynamic mechanical analysis, x-ray diffraction, and differential scanning calorimetry. The results show that stacked layers are obtained, especially for the SSD method, since it decreases the nanocomposites viscosity, mostly due to the self-lubricity of mGO layers. Finally, the photodegradation behaviour was investigated and revealed that mGO plays an important role, with a factor of three increase regarding photodegradation resistance, when compared to pure polypropylene.
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•The LPF method shows smaller particle sizes compared to the SSD method.•Shear viscosity of nanocomposites decreases due to the intrinsic self-lubricity of mGO.•DMA show the mGO particles are localised in the amorphous region, preferentially.•The mGO particles delay the photo-oxidative process by the screen mechanism.•A stabilization factor of three times is observed for the nanocomposites.