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Poly(arylene ether sulfone) and poly(ethylene oxide) (PEO)-based segmented polyurethanes were synthesized as potential gas separation membrane materials. Poly(arylene ether sulfone) oligomers with controlled molecular weights (15,000 and 20,000 g/mol Mn) were prepared with phenol endgroups by nucleophilic aromatic substitution step growth polymerization of 4,4'-dichlorodiphenylsulfone with a calculated...
Disulfonated poly(arylene ether sulfone) random copolymers with controlled oligomeric molecular weights were synthesized via nucleophilic aromatic substitution step polymerization. A monofunctional endcapping reagent, meta-aminophenol, was utilized to control the molecular weight of the oligomers and to install telechelic amine endgroups. The meta-aminophenol end-capped oligomers were reacted with...
The photophysical behaviour of benzophenone (BP) in poly(methyl methacrylate) (PMMA) has been studied as a function of temperature. Time-resolved phosphorescence data reveal that at no temperature between 77 and 420 K can the decay behaviour of the triplet state of BP in PMMA be described adequately by a single exponential function. This contrasts with the phosphorescence behaviour of BP in low temperature,...
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