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Reduction and control of domain spacing by additive inclusion: morphology and orientation effects of glycols on microphase separated PS-b-PEO
Ghoshal, Tandra; Shaw, Matthew T.; Holmes, Justin D.; Morris, Michael A.
Cylindrical phase polystyrene-b-polyethylene oxide (PS-b-PEO) block copolymer (BCP) was combined with lower molecular weight poly/ethylene glycols at different concentrations and their effect on the microphase separation of BCP thin films were studied. Well-ordered microphase separated, periodic nanostructures were realized using a solvent annealing approach for solution cast thin films. By optimizing solvent exposure time, the nature and concentration of the additives etc. the morphology and orientation of the films can be controlled. The addition of the glycols to PS-b-PEO enables a simple method by which the microdomain spacing of the phase separated BCP can be controlled at dimensions below 50nm. Most interestingly, the additives results in an expected increase in domain spacing (i.e. pitch size) but in some conditions an unexpected reduction in domain spacing. The pitch size achieved by modification is in the range of 16–31nm compared to an unmodified BCP system which exhibits a pitch size of 25nm. The pitch size modification achieved can be explained in terms of chemical structure, solubility parameters, crystallinity and glass transition temperature of the PEO because the additives act as PEO ‘stress cracking agents’ whereas the PS matrix remains chemically unaffected.
Keyword(s): Self-assembly; Block copolymer; Domain spacing reduction; Additives and glycols; Morphology and orientation
Publication Date:
2015
Type: Journal article
Peer-Reviewed: Yes
Language(s): English
Institution: University College Cork
Funder(s): Science Foundation Ireland
Citation(s): Ghoshal, T., Shaw, M. T., Holmes, J. D. and Morris, M. A. (2015) 'Reduction and control of domain spacing by additive inclusion: Morphology and orientation effects of glycols on microphase separated PS-b-PEO', Journal of Colloid and Interface Science, 450, pp. 141-150. doi: 10.1016/j.jcis.2015.03.022
Publisher(s): Elsevier
File Format(s): application/pdf
Related Link(s): http://www.sciencedirect.com/science/article/pii/S0021979715002817
First Indexed: 2018-09-14 06:32:08 Last Updated: 2018-09-14 06:32:08