A Re-Evaluation of the Morphology of a Bicontinuous Block Copolymer-Ceramic Material

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• 作者：Gilman E. S. Toombes ; Adam C. Finnefrock ; Mark W. Tate ; Ralph Ulrich ; Ulrich Wiesner ; Sol M. Gruner
• 刊名：Macromolecules
• 出版年：2007
• 出版时间：December 11, 2007
• 年：2007
• 卷：40
• 期：25
• 页码：8974 - 8982
• 全文大小：542K
• 年卷期：v.40,no.25(December 11, 2007)
• ISSN：1520-5835

文摘

The structures of a poly(isoprene-block-ethylene oxide) (PI-b-PEO) block copolymer-directedaluminosilicate mesostructure and the resulting ceramic material obtained from calcination were studied via small-angle X-ray scattering (SAXS) and transmission electron microscopy (TEM). The PI minority phase (volumefraction 0.36) formed a continuous network of channels, previously reported^1,2 to be consistent with the plumber'snightmare³ morphology. The solvent casting process used to form the material caused it to shrink uniaxially by~30%, deforming the network structure within it. Calculated structure factors for constant-curvature and constant-thickness models of a distorted double gyroid structure are consistent with SAXS from the material, while [100]and [111] projections of the distorted double gyroid structure match the TEM data. Because the structural datafrom the material is most consistent with a distorted version of the double gyroid morphology, the previousassignment of the plumber's nightmare morphology must be reconsidered. Approaches for structural assignmentare also discussed.