Abstract
New polyhedral oligomeric silsesquioxanes (POSS), (iBuSi)7O12SiOSi(Me)2CH2(CH2)nCH2OC(O)C(CH3)═CH2 bearing one single methacrylate group, were synthesized by hydrosilylation of allylalcohol or 4-penten-1-ol, followed by acylation with methacryloyl chloride. All intermediates and final derivatives were carefully characterized by FTIR, 1H, 13C, and 29Si solution state NMR, size exclusion chromatography (SEC), MALDI-TOF MS, and powder XRD (including full indexation of the diffraction patterns). In a second step, POSS/methacrylate based films were prepared. For 10 wt % of POSS, phase separation occurs with concomitant POSS crystallization. This behavior is not observed for 2 wt %, but XPS analyses show migration of POSS toward the film−air interface, which led to improved hydrophobic properties of the UV polymerized films with a 30° increase in contact angle.
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