Polyvinylchloride pyrolysis

M.A. Uddin, T. Bhaskar, J. Kaneko, A. Muto, Y. Sakata, and T. Matsui, Dehydrohalogenation during pyrolysis of brominated flame retardant containing high impact polystyrene (HIPS-Br) mixed with polyvinylchloride (PVC), Fuel, 81(14) 1819-1825, September 2002. 

A series of studies dealing with the process integrated dehydrochlorination of plastic mixtures (polyvinylchloride, polystyrene and polyolefines) has been done by Homung and Bockhorn [33-35]. By varying the temperamre in distinct steps it was possible to evolve 99.6% of the HCl before the main pyrolysis of polystyrene and polyolefines appeared. 

Fig. 43. Pyrolysis of (i) polyvinylchloride and (ii) poly(vinylidine chloride) in a nitrogen atmosphere [ 142 ].

Various workers have discussed the fire retardancy of polyvinylchloride (PVC) [55-59] using ammonium treated clay montmorillonite nanocomposites [52], hydroxyapatite nanocomposites [56] and antimony trioxide [57]. Lum [60] examined the effect of flame retardant additives on polymer pyrolysis reactions with a PVC composition containing 3 phr of SbiOs. It is well known that a synergistic flame retardancy effect is observed when SbiOs is incorporated into organic halide materials such as PVC. 

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