Small-angle X-ray scattering of concentration dependent structures in block copolymer solutions

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Abstract

The concentration and temperature dependence of the structure of a poly(styrene-b-ethylene-alt-propylene) (PS-PEP) diblock copolymer in squalane, a highly selective solvent for the PEP block, was investigated using small-angle X-ray scattering (SAXS). With decreasing concentration, between 100% and 10% by weight, a nearly monodisperse PS-PEP (block molecular weights of 42-000 g/mol and 62-000 g/mol for PS and PEP, respectively) exhibited lamellae (LAM), hexagonally packed cylinders (HEX), body-centered cubic spheres (BCC) and disordered spherical micelles. The results show that squalane (C30H62) is essentially completely segregated into the PEP domains, and thus it behaves like a short PEP homopolymer. With increasing amounts of squalane the conformation of the PS block changes from stretched to nearly fully relaxed at the lowest polymer concentrations.

Original languageEnglish (US)
Pages (from-to)7978-7986
Number of pages9
JournalMacromolecules
Volume47
Issue number22
DOIs
StatePublished - Nov 25 2014

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