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- W2003156958 abstract "The tumbling of five nitroxide spin probes (molecular weights between 172–486 g/mol) in a standard unfractionated polyisobutylene [M̄v = (1.26 ± 0.18) × 106g/mol] has been studied by means of the electron spin resonance (e.s.r.) technique. The temperature at which the separation of the outermost peaks of the e.s.r. spectrum is 50 G (T50G) attained a limiting value T′50G = 330K at probe MW = 332 g/mol. This temperature coincided with the temperature of the loss maximum of the merged glass transition (Tg) and segmental relaxations at the corresponding frequency (3 × 107 Hz). A literature survey indicated that an analogous situation exists in the case of poly(vinylidene fluoride) and polyamide-6,10 while T′50G values of poly(2,6-dimethyl phenylene oxide) and polycarbonate are correlated only to segmental relaxations of polymer chains. It is concluded that the equation: T50G = Tg[1 + (exp Tg/Tc)−1] describes generally the temperature shift between glass transitions at low and high frequencies and can be applied to determine experimentally low frequency Tg values from T′50G values if Tg and T < Tg relaxations (if any are present) are already merged at this temperature." @default.
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- W2003156958 title "Generalization of correlation between polymer glass transition Tg and an e.s.r. parameter T50G" @default.
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- W2003156958 doi "https://doi.org/10.1016/0032-3861(78)90141-6" @default.
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