Ordered microphase separation in thin films of PMMA-PBA synthesized by RAFT: effect of block polydispersity

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dc.contributor.authorSriprom, Wen_AU
dc.contributor.authorJames, Men_AU
dc.contributor.authorPerrier, Sen_AU
dc.contributor.authorNeto, Cen_AU
dc.date.accessioned2009-06-19T06:29:09Zen_AU
dc.date.accessioned2010-04-30T05:03:56Zen_AU
dc.date.available2009-06-19T06:29:09Zen_AU
dc.date.available2010-04-30T05:03:56Zen_AU
dc.date.issued2009-04-28en_AU
dc.date.statistics2009-04-28en_AU
dc.description.abstractThe microphase separation of diblock copolymers synthesized by reversible addition−fragmentation chain transfer (RAFT) polymerization, containing one monodisperse block (poly(methyl methacrylate), PMMA) and one polydisperse block (poly(butyl acrylate), PBA), was investigated in thin films (<100 nm). The formation of ordered microphase-separated domains was observed by atomic force microscopy (AFM) and resulted in four morphologies, depending on composition and film thickness: parallel lamellae, hexagonally packed perforated lamellae (PL), parallel cylinders (C∥), and hexagonally packed spheres, and in C∥-to-PL-to-C∥ transitions. Polydispersity of the PBA block shifts the phase boundaries toward higher PBA volume fraction values with respect to those expected for monodisperse block copolymers and stabilizes the perforated lamella morphology. Neutron reflectivity data confirmed that lamellae parallel to the substrate form at a very low PBA volume fraction, fPBA = 0.23. Polydispersity of the PBA block also has the effect of stabilizing each microphase domain over a film thickness regime larger than expected for monodisperse blocks. For the first time RAFT-polymerized block copolymers are shown to microphase separate with high reproducibility and with excellent degree of order, hence proving to be ideal systems to test the effect of polydispersity on microphase separation. © 2009, American Chemical Societyen_AU
dc.identifier.citationSriprom, W., James, M., Perrier, S., & Neto, C. (2009). Ordered microphase separation in thin films of PMMA-PBA synthesized by RAFT: effect of block polydispersity. Macromolecules, 42(8), 3138-3146. doi:10.1021/ma9004428en_AU
dc.identifier.govdoc1257en_AU
dc.identifier.issn0024-9297en_AU
dc.identifier.issue8en_AU
dc.identifier.journaltitleMacromoleculesen_AU
dc.identifier.pagination3138-3146en_AU
dc.identifier.urihttp://dx.doi.org/10.1021/ma9004428en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/1443en_AU
dc.identifier.volume42en_AU
dc.language.isoenen_AU
dc.publisherAmerican Chemical Societyen_AU
dc.subjectAtomic force microscopyen_AU
dc.subjectThin filmsen_AU
dc.subjectCopolymersen_AU
dc.subjectPolymerizationen_AU
dc.subjectMorphologyen_AU
dc.subjectPhase transformationsen_AU
dc.titleOrdered microphase separation in thin films of PMMA-PBA synthesized by RAFT: effect of block polydispersityen_AU
dc.typeJournal Articleen_AU
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