Local Segmental Dynamics of Polyacrylates in Concentrated Chloroform Solutions
The behavior of methine-labeled poly(ethyl acrylate)-d1 (PEA-d1), poly(iso-propyl acrylate)-d1 (PIPA-d1), and poly(n-butyl acrylate)-d1 (PNBA-d1) has been studied with deuterium NMR relaxation time measurements in concentrated solutions with chloroform. PEA-d1 and PNBA-d1 behaved similarly in terms of solution dynamics, but PIPA-d1 was found to reorient significantly faster at similar concentrations. The relaxation times were fitted to a log-normal distribution of correlation times and the resulting mean correlation times fit to Arrhenius behavior. The energies of activation were found to increase with increasing concentration from about 6 kJ/mol at lower concentrations to 10-20 kJ/mol from about 40 to 80 wt % polymer.
F. D. Blum and R. B. Durairaj, "Local Segmental Dynamics of Polyacrylates in Concentrated Chloroform Solutions," ACS Symposium Series 834: NMR Spectroscopy of Polymers in Solution and in the Solid State, American Ceramic Society, Jan 2002.
National Science Foundation (U.S.)
Article - Conference proceedings
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