Strongly segregated cubic microdomain morphology consistent with the double gyroid phase in high molecular weight diblock copolymers of polystyrene and poly(dimethylsiloxane) |
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| Authors: | Nikolaos Politakos Eleftherios Ntoukas Apostolos Avgeropoulos Vahik Krikorian Brian D Pate Edwin L Thomas Randal M Hill |
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| Institution: | 1. Department of Materials Science and Engineering, University of Ioannina, Administration Building, University Campus Dourouti, 45110 Ioannina, Greece;2. Department of Materials Science & Institute of Soldier Nanotechnologies, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139;3. E Ink Corporation, 733 Concord Ave., Cambridge, Massachusetts 02138 |
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| Abstract: | We report the observation of a cubic phase consistent with the double gyroid structure in strongly segregated diblock copolymers of PS‐b‐PDMS over a volume fraction (φPDMS) range of ～0.39 to 0.45. The samples have respective molecular weights of 127 kg/mol and 73 kg/mol and degree of segregation Nχ equal to 187 and 106, respectively, at annealing temperature of 130 °C. It is important to highlight that two out of the total four samples investigated, exhibited hexagonally close packed cylindrical domains of PDMS and alternating lamellae at φPDMS = 0.39 and 0.45, respectively, indicating the possible narrow range of the DG morphology for the specific diblock copolymers. © 2009 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 47: 2419–2427, 2009 |
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| Keywords: | anionic polymerization block copolymers diblock copolymers double gyroid gel permeation chromatography (GPC) NMR phase diagrams polysiloxanes SAXS poly(dimethylsiloxane) self‐assembly TEM |
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