Force measurement between self-assembled layers of polyisoprene-poly-2-vinylpyridine block copolymers in solution and in the melt

Hiroshi Watanabe, Matthew Tirrell

Research output: Contribution to journalConference articlepeer-review

5 Scopus citations

Abstract

We have studied poly-2-vinylpyridine-polystyrene (PVP/PS) block copolymers, adsorbed on mica from solution in toluene, a selective solvent for polystyrene. The adsorption on mica was done for the purposes of studying the adsorbed configuration via direct force measurement between adsorbed layers using the Israelachvili surface forces balance. It was shown that the nonadsorbing portions of these chains extend a long distance away from the mica surface into the toluene solvent phase. 'Long' here means that forces were detectable at several-to-many multiples of the unperturbed dimensions (Rg) of the nonadsorbing part of the chains, in contrast to the 2-3 Rg separation at which forces are typically first observed between adsorbed homopolymer layers. The data that we have thus far on PVP/PS indicate, at least for large PVP anchoring blocks, that the range of the forces varies linearly with the molecular weight of the nonadsorbing PS block, also in contrast to homopolymer data, where the range varies with Rg, or roughly with the square root of molecular weight. The long range and the linear variation of range with molecular weight are the evidence of an extended configuration for the nonadsorbing block.

Original languageEnglish (US)
Pages (from-to)387-388
Number of pages2
JournalAmerican Chemical Society, Polymer Preprints, Division of Polymer Chemistry
Volume30
Issue number1
StatePublished - Apr 1989
EventPapers Presented at the Dallas, Texas Meeting - Dallas, TX, USA
Duration: Apr 9 1989Apr 14 1989

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