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    Insights into the influence of solvent polarity on the crystallization of poly(ethylene oxide) spin-coated thin films via in situ grazing incidence wide angle x-ray scattering

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    Publication date
    2016-06-28
    Author
    Toolan, D.T.W.
    Isakova, A.
    Hodgkinson, R.
    Reeves-McLaren, N.
    Hammond, O.S.
    Edler, K.J.
    Briscoe, W.H.
    Arnold, T.
    Gough, Timothy D.
    Topham, P.D.
    Howse, J.R.
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    Keyword
    Solvent polarity; Crystallization; Poly(ethylene oxide); Spin-coated thin films; Grazing incidence wide-angle X-ray scattering (GIWAXS)
    Rights
    © 2016 ACS. Reproduced in accordance with the publisher's self-archiving policy.
    Peer-Reviewed
    yes
    
    Metadata
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    Abstract
    Controlling polymer thin-film morphology and crystallinity is crucial for a wide range of applications, particularly in thin-film organic electronic devices. In this work, the crystallization behavior of a model polymer, poly(ethylene oxide) (PEO), during spincoating is studied. PEO films were spun-cast from solvents possessing different polarities (chloroform, THF and methanol) and probed via in situ grazing incidence wide angle x-ray scattering. The crystallization behavior was found to follow the solvent polarity order (where chloroform < THF < methanol) rather than the solubility order (where THF > chloroform > methanol). When spun-cast from non-polar chloroform, crystallization largely followed Avrami kinetics, resulting in the formation of morphologies comprising large spherulites. PEO solutions cast from more polar solvents (THF and methanol) do not form well-defined highly crystalline morphologies and are largely amorphous with the presence of small crystalline regions. The difference in morphological development of PEO spun-cast from polar solvents is attributed to clustering phenomena that inhibit polymer crystallization. This work highlights the importance of considering individual components of polymer solubility, rather than simple total solubility, when designing processing routes for the generation of morphologies with optimum crystallinities or morphologies.
    URI
    http://hdl.handle.net/10454/8570
    Version
    Accepted Manuscript
    Citation
    Toolan DTW, Isakova A, Hodgkinson R, Reeves-McLaren N, Hammond OS, Edler KJ, Briscoe WH, Arnold T, Gough T, Topham PD, and Howse JR (2016) Insights into the influence of solvent polarity on the crystallization of poly(ethylene oxide) spin-coated thin films via in situ grazing incidence wide angle x-ray scattering. Macromolecules, 49 (12): 4579-4586.
    Link to publisher’s version
    http://dx.doi.org/10.1021/acs.macromol.6b00312
    Type
    Article
    Collections
    Engineering and Informatics Publications

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