Measurement of the Correlation Hole in Homogeneous Block Copolymer Melts

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Abstract

Homogeneous block copolymer melts are predicted to exhibit a decrease in interchain segment correlation (a “correlation hole”) at wavevectors corresponding to a polymer coil radius. Small-angle neutron scattering data are presented which demonstrate this effect in two 1,4-polybutadiene-1,2-polybutadiene diblock copolymers. These results are quantitatively predicted by the mean-field theory of Leibler, thereby providing a new method for determining the Flory interaction parameter x in binary polymer blends. x was found to be dependent on sample composition, which can be attributed to equation-of-state contributions to the mixing free energy.

Original languageEnglish (US)
Pages (from-to)525-528
Number of pages4
JournalMacromolecules
Volume18
Issue number3
DOIs
StatePublished - May 1985

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