Abstract
The mechanical properties and fire resistance of a recycled poly(ethylene terephthalate) were improved by using a specific treatment of the waste material and the incorporation of encapsulated red phosphorus in combination with co-additives. The use of red phosphorus has to be limited due to a negative influence on impact resistance and rate of heat release. Among several metal oxides, Al 2O 3 acts as a good co-synergist at a total loading of 5 wt.% due to its reactivity, high specific surface area and aluminium phosphate formation. The complementary use of glass fibres can also generate intumescence by improving the mechanical stability of the char layer.
Highlights
The main applications of reclaimed poly(ethylene terephthalate) (PET) bottles after regeneration are fibres, packaging, strips and films [1]
The chemical analysis of the recycled PET revealed that it contains remaining impurities such as paper and nonmiscible plastics
The choice of encapsulated red phosphorus as flame retardant leads to interesting flammability results, the use of increasing percentages of red phosphorus causes a strong decrease in impact resistance and an increase in the exothermicity for the first step of PET thermal degradation in air
Summary
The main applications of reclaimed poly(ethylene terephthalate) (PET) bottles after regeneration are fibres, packaging, strips and films [1]. The re-use of PET in technical applications is limited. This can be explained by the difficulty of reprocessing PET and the need to confer new properties in order to obtain engineered plastics. Some indications were given by Muller et al [2] concerning the decrease in molecular weight for recycled PET in comparison with virgin PET. This phenomenon is ascribed to chain breakages due to the presence of traces of water and acidic impurities. The objectives of this work were to prepare a PET with controlled mechanical properties (by drying and elimination of impurities) from a commercial recycled PET, and to improve its resistance to flammability
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