Small-Angle Neutron Scattering Determination of Macrolattice Structure in a Polystyrene-Polybutadiene Diblock Copolymer

F. S. Bates, R. E. Cohen, C. V. Berney

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Abstract

A polystyrene-polybutadiene diblock copolymer (in which the butadiene phase is deuterated to enhance neutron contrast) has been synthesized and its morphology (polybutadiene spheres in a polystyrene matrix) determined by electron microscopy. Small-angle neutron scattering experiments give well-resolved Bragg peaks whose positions show that the packing of the polybutadiene spheres is either simple cubic or body-centered cubic. The scattering data give a mean radius of 124 Å for the polybutadiene spheres; this result (together with unit cell dimensions from the Bragg peaks) allows calculations of an estimated volume fraction of polybutadiene for each packing mode. Comparison with an experimentally derived value indicates that the packing is body-centered cubic.

Original languageEnglish (US)
Pages (from-to)589-592
Number of pages4
JournalMacromolecules
Volume15
Issue number2
DOIs
StatePublished - 1982

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