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- W2315676840 abstract "We show that segmental orientation correlations, arising from network constraints and reflected in NMR observables such as the apparent proton residual dipolar coupling constant (RDCC), are sensitive to the thermodynamic state of a swollen network. The RDCC is proportional to a dynamic tensor order parameter of the network chain, which depends upon the fluctuation statistics of a network chain subject to swelling-induced stretching and excluded-volume interactions. The correlation of its value at swelling equilibrium with the corresponding degree of swelling for different networks directly reflects the value of the thermodynamic interaction parameter. A description of the phenomenon based on scaling theory allows for conclusions on the limited validity of the classical Flory–Rehner (FR) model for the good-solvent case. Our study is supplemented by temperature-dependent swelling experiments of different PDMS networks in various solvents, analyzed via a novel construction of solvent-independent swelling master curves, which also emphasize deviations from the FR model for good solvents and further confirm previous reports on concentration- or cross-linking-dependent interaction parameters. We rationalize the failure of the FR model for the good-solvent case in terms of the ratio of the network correlation length and the thermal blob size." @default.
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- W2315676840 date "2012-06-29" @default.
- W2315676840 modified "2023-09-23" @default.
- W2315676840 title "Thermodynamics of Swollen Networks As Reflected in Segmental Orientation Correlations" @default.
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- W2315676840 doi "https://doi.org/10.1021/ma3009004" @default.
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