The polycarbonates are polymers which have organic functional groups linked together by carbonate groups. PC is one of the high performance heterochain polymeric materials that comprise the family of engineering thermoplastics. PC is a good material choice in industry not only due to its characteristics, but also because its processing is environmentally friendly, and it can be recycled.
Types and function
Primary antioxidants, such as hindered phenols and secondary arylamines, function mainly by scavenging the peroxy radical intermediates in the oxidation process. In general, they are effective over a wide temperature range, and are useful to improve both the processing and long-term thermal stability of plastics.
Secondary antioxidants, such as phosphites and thioethers, function by decomposition of hydroperoxides. Phosphites are most effective at the high temperatures of melt processing operations, while thioethers function best in the solid phase at long-term use temperatures.
Antiozonants, such as p-phenylenediamine prevent or slow down the degradation of material caused by ozone. This is naturally present in the air at very low concentrations but is exceedingly reactive, particularly towards unsaturated polymers such as rubber, where it causes ozone cracking. The mechanism of ozonolysis is different from other forms of oxidation and hence requires its own class of antioxidant stabilizers.
Elastomers & latex
Polyols & Polyurethanes