Molecular weight and configurational stability of poly(phenylacetylene) prepared with Rh catalyst

Synthesis and Spectral Properties of Novel Poly(disubstituted acetylene)s

“…27). To the best of our knowledge, stability in an aerated solution has only been studied for the group of poly(monosubstituted acetylene)s 40–46, 77–79. Also in these studies, the bulkiness of substituents was reported to enhance the resistance of polymers to degradation 46, 77, 79.…”

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

“…Such an arrangement in which aryl pendants are fairly perpendicular to the main chain C¼C bond plane may enhance the effective conjugation length of trans-rich polyene main chains as discussed, e.g., in ref. [82] Conclusion A new polyacetylene-type polymer, high-cis PdFPhA, was prepared by polymerization of respective monomer with [Rh(COD)acac] catalyst. The MW and configurational stability of high-cis PdFPhA dissolved in THF-d 8 was investigated in long-term aging experiments in which PdFPhA solution was kept in contact with the atmosphere and diffuse daylight.…”

“…The answer to this question may be obtained by the preparative MW fractionation of a partly aged polymer and the subsequent NMR analysis of isolated polymer fractions. [82] We applied this approach for the analysis of studied polymers. THF solutions of polymers (concentration 1 mg Á mL À1 ) aged (i) for 240 h in the case of PdFPhA and (ii) for 48 h in the case of PPhA were submitted to the MW fractionation.…”

“…[77,79] In our recent papers we have reported on the MW and configurational stability of high-cis PPhA and high-cis and cis/trans poly(fluorophenylacetylene)s (all three positional isomers). [81,82] It was particularly found that in the case of high-cis polymers the oxidative degradation was of a nonrandom character and was significantly accelerated by simultaneously proceeding cis-to-trans isomerization.…”

Poly(disubstituted acetylene)s With Pendant Naphthalimide‐Based Fluorophore Groups

“…Polymers of monosubstituted acetylenes are mostly well soluble, and their constitution can be easily tuned because there are many methods for preparation of these polymers carrying various functional groups 8–14. But these polymers are not sufficiently stable when exposed to air or increased temperatures,15–20 particularly in solution 15, 17, 21. In contrast, poly(disubstituted acetylene)s (PDAs) exhibit high resistance to air oxidation and increased thermal stability,22–25 and have now been studied and considered as promising materials for liquid‐crystal displays,24–27 light‐emitting diodes,28 sensors,29, 30 and gas separation membranes 2, 31…”