The degradation of aromatic polyesters (like PET) is different from that of some of the more conventional commodity polymers like polyethylene and polypropylene and as such this process has not been closely analysed as it has been for PE/PP. However, as some types of aromatic polyester are now far more mainstream in terms of usage it is helpful to consider their degradation and the ways in which they can be stabilised, particularly since they are frequently being subjected to harsh conditions. Degradation (and any stabilisation required) must be considered not only from the point of view of the expected life-time of the product, but also with respect to what happens at the end of its life - is it expected to biodegrade or remain solid and recycleable? There is much to consider in this area.
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