Degradation of outdoor exposed poly (1-trimethylsilyl)-1-propyne

Molecular weight and configurational stability of poly[(fluorophenyl)acetylene]s prepared with metathesis and insertion catalysts

“…In 1990s, our group published several articles devoted exclusively to the degradation of monosubstituted high‐MW polyarylacetylenes (mostly of cis / trans microstructure)54–57 and also proved size exclusion chromatography (SEC) as a powerful tool for the study of this phenomenon 57–62. Our results together with those of systematic studies of other research groups63–66 can be summarized as follows: (i) The degradation is either conditioned or at least strongly accelerated by the presence of oxygen in the system, and in deeply degrading polyacetylenes the oxidized fragments of polymer chains are usually found. It is mostly supposed that the degradation is initiated by a direct reaction of oxygen with a defect of polyacetylene chain (unpaired electron) and that it may continue, for example, via chemism proposed for the auto‐oxidation of poly(methylacetylene) 67.…”

SEC/DAD and1H NMR Study of Molecular Weight and Configurational Stability of Poly(2,4-difluorophenylacetylene) and Polyphenylacetylene Prepared with Rh Catalyst

“…The MW stability of monosubstituted cis/trans polyacetylenes in air at room or slightly higher temperature was studied in 1980s and 1990s by various research groups [32,48,[55][56][57][58][59][60][61][62] including our group. [63][64][65][66][67] Probably the first work on this subject was done by Percec and co-workers who described the slow decrease in molecular weight (MW), i.e., degradation, of lower-MW polyphenylacetylene (PPhA) when it was exposed to the atmosphere in the solid state.…”