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• W2023844587 abstract "Self-diffusion of three high generations (the fifth, sixth, and seventh) of poly(allylcarbosilane) dendrimer in solutions with deuterated chloroform has been studied over a wide range of macromolecular concentrations (φ). Diffusivity has been measured by NMR with a pulsed gradient of the magnetic field. It is shown that concentration dependences of the dendrimer self-diffusion coefficients (D) can be reduced to the generalized concentration dependence. Over the range of volume concentrations from 0.01 up to 0.55, the curve of the generalized dependence of D for dendrimers coincides with the analogous dependence for globular protein in aqueous solutions. Analogous to the universal concentration dependence of D for linear polymers in solvent, the generalized concentration dependence of dendrimers tends to the asymptote D‘(φ)/D0 ∝ φ0 = 1 in the limit of extremely dilute solutions and to the asymptote D‘(φ)/D0 ∝ φ -3 in the range of concentrated solutions 0.3 < φ < 0.55. Here, D0 = limφ→0 D(φ) and D(φ) are the self-diffusion coefficients of dendrimer in an extremely dilute solution and in a solution with macromolecular concentration φ, respectively. D‘(φ) = D(φ)/L(φ), where L(φ) is a normalizing function, taking into account the change of the local mobility of dendritic branches as the macromolecular concentration increases; the L(φ) functions have been experimentally extracted from the concentration dependence of the longitudinal relaxation times for the dendrimers in solutions studied." @default.
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• W2023844587 date "2002-11-05" @default.
• W2023844587 modified "2023-10-13" @default.
• W2023844587 title "Generalized Concentration Dependence of Self-Diffusion Coefficients in Poly(allylcarbosilane) Dendrimer Solutions" @default.
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• W2023844587 doi "https://doi.org/10.1021/ma0213246" @default.
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