Molecular weight scaling in critical polymer mixtures

Mark D. Gehlsen, Jeffrey H. Rosedale, Frank S Bates, George D. Wignall, Lotte Hansen, Kristoffer Almdal

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Symmetric binary mixtures of partially deuterated polymers were prepared at the critical composition. The segment-segment interaction energy parameter eff was varied by adjusting the difference in deuterium content "XD between species. eff was measured as a function of temperature, "D, and molecular weight by small-angle neutron scattering. The critical point for demixing was determined to scale as eff,cN- with =1.01±0.05, where N is the degree of polymerization. This result confirms the mean-field prediction of Flory and Huggins.

Original languageEnglish (US)
Pages (from-to)2452-2455
Number of pages4
JournalPhysical Review Letters
Issue number16
StatePublished - Jan 1 1992


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