W. Domberger et al., RELAXATION BEHAVIOR IN THE ALPHA-BETA SPLITTING REGION OF THE GLASS-TRANSITION IN PNBMA BY MEANS OF C-13 2D-MAS EXCHANGE NMR, Journal of physics. Condensed matter, 7(38), 1995, pp. 7419-7426
Two distinct exchange rates are obtained in the splitting region of lo
cal (beta) and cooperative (alpha) relaxations for poly(n butyl methac
rylate) (PnBMA) by C-13 2D-MAS exchange NMR. They fit well to the shea
r loss modulus traces of alpha and beta in the Arrhenius diagram.