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- W2032267370 abstract "The application of laser light scattering techniques to characterize the structural and dynamical properties of bulk polymers near the glass transition temperature is reviewed. Preliminary results of a study of poly(n-butyl methacrylate) are presented. As in an earlier study of atactic polystyrene, the results suggest the coexistence of two relaxation mechanisms near Tg: a fast, single exponential decay; a slow process characterized by a wide distribution of relaxation times. The slow relaxation mechanism is evidently the main-chain glass transition process; it appears possible that the fast decay is a manifestation of side-chain motion. However, in contrast to the polystyrene system where the fast mechanism is always of small amplitude in the temperature range amenable to study (Tg < T < Tg + 40°), the fast mechanism in the poly(n-butyl methacrylate) system exhibits a sudden transition to high amplitude (∼50 percent of the total observable relaxation amplitude) at T ∼ Tg + 30°. At this point therefore, we suggest that a strong resonant coupling of the fast process with the slow relaxation is occurring." @default.
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- W2032267370 date "1981-10-01" @default.
- W2032267370 modified "2023-09-26" @default.
- W2032267370 title "Laser light scattering studies of bulk polymers in the glass transition regime" @default.
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- W2032267370 doi "https://doi.org/10.1002/pen.760211416" @default.
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