An examination is made of the process of introducing a mixture of stabilisers – sterically hindered phenols and phosphites – to stabilise recycled polyethylene terephthalate (RPET) with an initial moisture content of ~0.5 wt% during continuous extrusion. It is shown that, using a mixture of stabilisers of optimum composition, it is possible to increase the molecular weight of the RPET and to achieve effective thermal stabilisation of the extruded polymeric material.
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