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• W2062821809 abstract "Previously a rough correlation between the logarithm of the most probable secondary β-relaxation time at the glass temperature Tg, log[τβ(Tg)], and the Kohlrausch−Williams−Watts (KWW) exponent, (1 − n), of the primary α-relaxation correlation function exp[−(t/τα)1-n] was found when examining a whole host of chemically different glass-forming materials including amorphous homopolymers, small molecule van der Waal liquids, plastic crystals, and inorganic compounds. This rough correlation is expected from the exact correlation between the logarithm of the primitive relaxation time of the coupling model at the glass temperature Tg, log[τo(Tg)], and (1 − n) and from the similarity between the β-relaxation and the primitive relaxation, both being free from intermolecular cooperativity. This correlation holds only when n in the KWW exponent (1 − n) can be identified with the coupling parameter nα of the α-relaxation in the coupling model. Now, this correlation is examined on a series of poly(n-butyl methacrylate-stat-styrene) copolymers with styrene contents ranging from 0 to 66 mol % utilizing the dielectric relaxation data of Kahle et al. [Macromolecules 1997, 30, 7214]. For the present extension, the KWW function fails to fit the dielectric data due to the presence of concentration fluctuations in the random copolymer. Instead, the most probable coupling parameter n̂α of the n-butyl methacrylate component in the copolymers is obtained indirectly through the steepness of the temperature dependences of the most probable α-relaxation time. A good correlation between log[τβ(Tg)] and n̂α is found to hold in this series of copolymers as well as in the poly(n-alkyl methacrylates). Moreover, the orders of magnitude of τβ(Tg) and τo(Tg) are not far apart, supporting the similarity between the β-relaxation and the primitive relaxation." @default.
• W2062821809 created "2016-06-24" @default.
• W2062821809 creator A5042185480 @default.
• W2062821809 date "1999-09-18" @default.
• W2062821809 modified "2023-09-27" @default.
• W2062821809 title "Correlation between β-Relaxation and α-Relaxation in the Family of Poly(<i>n</i>-butyl methacrylate-<i>stat</i>-styrene) Random Copolymers" @default.
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• W2062821809 doi "https://doi.org/10.1021/ma990284b" @default.
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