Abstract
To investigate the crossover behavior of chain diffusion from Zimm- to Rouse-type, the tracer diffusion coefficient in poly(dimethylsiloxane) (PDMS) mixtures with no entanglements has been measured by the pulsed-field-gradient NMR (PFG NMR) method. Diffusion coefficient D of single chains (molecular weight MN) in polymer matrices (molecular weight Mp) was reasonably determined as a function of MN and Mp. MN and Mp ranged from 460 to 1.93×104. The crossover behavior has been observed: The Zimm-type diffusion for Mp<<27MN1/2, while the Rouse-type for Mp>>27MN1/2, although the crossover region was rather wide. The results were well described by the simple equation D=DZ+DR, where DZ and DR were the Zimm-type and Rouse-type diffusion coefficients, respectively.
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Kubo, T., Nose, T. Diffusion of Single Chains in Polymer Matrices as Measured by Pulsed-Field-Gradient NMR: Crossover from Zimm- to Rouse-Type Diffusion. Polym J 24, 1351–1361 (1992). https://doi.org/10.1295/polymj.24.1351
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DOI: https://doi.org/10.1295/polymj.24.1351
