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- W2029065404 abstract "We study the behavior of a solvophobic polyelectrolyte in a series of polar organic solvents of various quality and polarity. Small-angle X-ray scattering is used to measure the semidilute correlation length ξ as a function of polymer concentration. In polar solvents of good quality ξ varies as c-1/2 in the whole concentration range, as expected. Contrastingly, in acetonitrile, a polar solvent of poor quality, the scaling exponent is found to change from −1/2 to −1/7, in qualitative agreement with the predictions of the pearl necklace model of Dobrynin and Rubinstein. This behavior is attributed to the crossover between “string” and “bead-colloid” controlled regimes of the isotropic transient network. At yet higher concentrations a gel-like phase is found attributed to bead interpenetration. It is thought to be driven by the small Debye−Huckel screening length at these concentrations, in agreement with recent molecular dynamics simulations of Micka et al. The crossover concentration for both string/bead-colloid and colloid/gel regimes can be adjusted by mixing solvents of varying dielectric constant and quality. The effect of added of salt and temperature is also studied." @default.
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- W2029065404 date "2001-02-10" @default.
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- W2029065404 title "Semidilute and Concentrated Solutions of a Solvophobic Polyelectrolyte in Nonaqueous Solvents" @default.
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- W2029065404 doi "https://doi.org/10.1021/ma001086j" @default.
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