Mechanism of pyrolysis and carbonization of polymerscontaining triple bonds

摘要

The pyrolysis and carbonization of a triple bonds containing polymer, poly(p-phenylene butadiynylene) (PPPB),which was known to show high carbonization yield of more than 90%, was studied by using X-ray diffraction,TG-MS, solid state 13C-NMR and FT-IR techniques. These characterization technique indicated the Diels-Aldertype reaction among a triple bond and a diene-like part of PPPB, which resulted in the formation of cross-linksbetween the polymer chains up to 500℃. Above the temperature, the material changed to carbon-like structuresfound by XRD. By integrating the knowledge of these characterization, we proposed a mechanism for thepyrolysis and the carbonization of PPPB. Consequently, the reason for the high carbonization yield was due tonot only the few heteroatoms in this substance but also the cross-linking reactions lasting up to 500℃.