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Relaxation transitions in segmented polyether polyurethaneureas studied by thermally stimulated current analysis

Relaxation behavior of poly(ethylene glycol)-type segmented polyether polyurethaneurea (PEUU), which has microphase separated structure formed by hard and soft segments, was studied by TSC technique. TSC spectra of the PEUU films obtained by casting a N,N-dimethylacetamide solution of the PEUU showed four peaks which are denoted /spl gamma/,/spl beta/,/spl alpha/, and /spl rho/, in order of increasing temperature. These peaks are found to be closely related to molecular motion of the soft segment, namely, local motion (/spl gamma/ peak) of oxyethylene sequence, glass transition (/spl beta/ peak) caused by micro-Brownian motion, Maxwell-Wagner-Sillars interfacial polarization (/spl alpha/ peak), and transport (/spl rho/ peak) of charged ionic species. These experimental results demonstrated that the TSC analysis is a valuable tool for studying host polymer of polymeric solid-state ionic conductors.