Degradation studies of some polyesters and polycarbonates—1. Polylactide: General features of the degradation under programmed heating conditions

Thermal degradation begins to be important when polymers are processed and fabricated for use. The threshold temperature for breakdown determines the upper limit of temperature in fabrication and the volatile products of degradation must be known in order to guarantee the safety of workers. These same properties are relevant to the potential use of a polymeric material and, in the extreme case, to the hazards presented by the polymer in a fire situation. However, there are also some useful aspects of thermal degradation. Examination of the breakdown products from polymers is increasingly used as a method of analysis. In a limited number of cases, controlled thermal degradation is important in recycling of plastics waste and in the special case of carbon fibre production, degradative reactions are an essential part of the manufacturing process.

S.N. Gupta

Papers

Degradation of polymer blends—Part XI. Blends of polystyrene with polyisoprene