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Likewise, the XRD patterns in Figure 3c show that, for the samples synthesized with an initial MPTMS molar ratio of 0.20, longer TEOS prehydrolysis times yield products with increased mesoscopic order. These data indicatethat, in thepresenceof TEOS, low organosilane concentrations are required toform ordered mesophase materials, apparently becauseof comparablesolubilities of the respective PEO-PPO block copolymer moieties in organosilanes, which act as cosolvents that prevent nanophase separation. |
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