Mass spectrometric evolved gas analysis (MSEGA) study of the thermal decomposition of poly(1,2-acenaphthenediylidene) and poly(1,2-acenaphthylenylene) in vacuo

摘要: Abstract A mass spectrometric study of the thermal decompositions in vacuo two polyene polymers, poly(1,2-acenaphthenediylidene)-I and poly(1,2-acenaphthylenylene)-II, was performed order to establish differences between their structures. Evolution repeating units from a chain depropagation process both polymers observed. Annealing prior decomposition changed temperature at which maxima were observed on MSEGA ion current profiles. These profiles after annealing became more similar shape location. changes behaviour as result can be attributed an equalisation single double bonds structure polymers. The kinetic non-annealed showed that reaction for polymer I is isokinetic, i.e. same mechanism, when fraction sample decomposed “α” range 0.4–0.7 with values 127.8 ± 3.6 kJ mol−1 activation energy 2.6 2.2 × l07 s−1 factor. Polymer II did not show clearcut isokinetic behaviour, increasing 99.4 α = 0.4–113.5 0.7. This change altering during course decomposition. properties lead conclusion there bond alternation chains