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Tailoring The Degree Of Branching In Hyperbranched Poly (Arylene Ether Sulfone)S And Poly(Arylene Ether Ketone)S Prepared Via An A2 + Bb'b" Approach, Shravanthi Raghavapuram

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The synthesis and characterization of hyperbranched poly(arylene ether)s with tailored degrees of branching has been explored via an A₂+B₃ approach. The reactivity of the individual electrophilic sites towards nucleophilic aromatic substitution, NAS, of the BB'B" monomers 4, 3', 5'-trifluorophenyl sulfone, 1 and 4, 3', 5'-trifluoro benzophenone, 2 were studied. The concentration, temperature and solvent conditions had an effect on the degree of branching, DB, in 1 and 2 and were probed via ¹³C and ¹⁹F NMR spectroscopy as well as a series of model reactions employing p-cresol 16, which acts as the nucleophile. Soluble, …