Lamellar and liquid crystal ordering in solvent-annealed all-conjugated block copolymers

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dc.citation.firstpage3817
dc.citation.journalTitleSoft Matter
dc.citation.lastpage3825
dc.citation.volumeNumber10
dc.contributor.authorLin, Yen-Hao
dc.contributor.authorYager, Kevin G.
dc.contributor.authorStewart, Bridget
dc.contributor.authorVerduzco, Rafael
dc.date.accessioned2014-07-23T15:30:35Z
dc.date.available2014-07-23T15:30:35Z
dc.date.issued2014
dc.description.abstractAll-conjugated block copolymers are an emerging class of polymeric materials promising for organic electronic applications, but further progress requires a better understanding of their microstructure including crystallinity and self-assembly through micro-phase segregation. Here, we demonstrate remarkable changes in the thin film structure of a model series of all-conjugated block copolymers with varying processing conditions. Under thermal annealing, poly(3-hexylthiophene)-b-poly(90,90-dioctylfluorene) (P3HT-b-PF) all-conjugated block copolymers exhibit crystalline features of P3HT or PF, depending on the block ratio, and poor π- π stacking. Under chloroform solvent annealing, the block copolymers exhibit lamellar ordering, as evidenced by multiple reflections in grazing incidence wide and small-angle X-ray scattering (GIWAXS and GISAXS), including an in-plane reflection indicative of order along the π- π stacking direction for both P3HT and PF blocks. The lamellae have a characteristic domain size of 4.2 nm, and this domain size is found to be independent of block copolymer molecular weight and block ratio. This suggests that lamellar self-assembly arises due to a combination of polymer block segregation and π- π stacking of both P3HT and PF polymer blocks. Strategies for predicting the microstructure of all-conjugated block copolymers must take into account intermolecular π- π stacking and liquid crystalline interactions not typically found in flexible coil block copolymers.
dc.identifier.citationLin, Yen-Hao, Yager, Kevin G., Stewart, Bridget, et al.. "Lamellar and liquid crystal ordering in solvent-annealed all-conjugated block copolymers." <i>Soft Matter,</i> 10, (2014) The Royal Society of Chemistry: 3817-3825. http://dx.doi.org/10.1039/c3sm53090f.
dc.identifier.doihttp://dx.doi.org/10.1039/c3sm53090f
dc.identifier.urihttps://hdl.handle.net/1911/76259
dc.language.isoeng
dc.publisherThe Royal Society of Chemistry
dc.rightsThis Open Access Article is licensed under a Creative Commons Attribution 3.0 Unported Licence
dc.rights.urihttps://creativecommons.org/licenses/by/3.0/
dc.titleLamellar and liquid crystal ordering in solvent-annealed all-conjugated block copolymers
dc.typeJournal article
dc.type.dcmiText
dc.type.publicationpublisher version
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