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Correlation of thermal degradation mechanisms: Polyacetylene and vinyl and vinylidene polymers

1986; Wiley; Volume: 24; Issue: 2 Linguagem: Inglês

10.1002/pola.1986.080240209

1099-0518

Giorgio Montaudo, Concetto Puglisi, Emilio Scamporrino, Daniele Vitalini,

Risk and Safety Analysis

Abstract The thermal degradation of poly(vinyl bromide) (PVB), poly(vinyl chloride) (PVC), poly(vinyl alcohol) (PVA), poly(vinyl acetate) (PVAc), poly(vinyl fluoride) (PVF), poly(vinylidene chloride) (PVC 2 ), and poly(vinylidene fluoride) (PVF 2 ) has been studied by direct pyrolysis–mass spectrometry (DP‐MS) and flash pyrolysis–gas chromatography–mass spectrometry techniques. Vinyl and vinylidene polymers exhibit two competitive thermal degradation processes: (1) HX elimination with formation of polyene sequences which undergo further moleculaar rearrangements, and (2) main‐chain cleavage with formation of halogenated or oxigenated compounds. The overall thermal degradation process depends on the prevailing decomposition reaction in each polymer; therefore, different behaviors are observed. The thermal degradation of polyacetylene (PA) has also been studied and found important for the elucidation of the thermal decomposition mechanism of the title polymers.