Preparation of a Thermally Stable Room Temperature Ionic Liquid Containing Cage-Like Oligosilsesquioxane with Two Types of Side-Chain Groups

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  • Selected Paper : Preparation of a Thermally Stable Room Temperature Ionic Liquid Containing Cage-Like Oligosilsesquioxane with Two Types of Side-Chain Groups

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<p>A thermally stable room temperature ionic liquid containing cage-like oligosilsesquioxane (POSS) with two types of side-chain groups (Amim-Cage-SQ-IL) was successfully prepared by the hydrolytic condensation of a mixture of two organotrialkoxysilanes from which one contained a quaternary ammonium group trimethyl[3-(triethoxysilyl)propyl]ammonium chloride (TTACl) and the other an imidazolium group 1-methyl-3-[3-(triethoxysilyl)propyl]imidazolium chloride (MTICl). Moreover, superacid bis(trifluoromethanesulfonyl)imide (HNTf2) was used as a catalyst in water/methanol mixed solvent. Amim-Cage-SQ-IL exhibited a glass-transition temperature (Tg) of −8 °C as indicated by a baseline shift in the differential scanning calorimetry (DSC) curve. In addition, fluidity was visually observed at ca. 30 °C, i.e., Amim-Cage-SQ-IL is a room temperature ionic liquid. Because of the low molecular symmetry of the resulting POSS compound containing two different randomly distributed side-chain groups, its crystallization was suppressed, leading to the disappearance of the melting temperature (Tm). Consequently, Amim-Cage-SQ-IL exhibited low flow temperature. Moreover, the pyrolysis temperatures of Amim-Cage-SQ-IL were extremely high (its pyrolysis temperature of the 5% weight loss was 420 °C).</p>

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