Hydrophobicity of polyhedral oligomeric silsesquioxane was selectively improved by simple amidiation reaction with hydrophilic colour reagent (carboxyazo-p-COOH, PCAC) at ambient temperature. The molecular structure, thermal properties and absorption features of the resulting PCAC-POSS were characterised by Fourier transform infrared, thermal gravimetric analyses, differential scanning calorimetry and visible absorption spectra. Modified polyhedral oligomeric silsesquioxane nanoparticles exhibit excellent solubility in ethanol, and keep insoluble in aqueous solution. The solubility is selectively controlled by proper hydrophilic modification using a simple and mild amidation reaction.
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Gao et al. (2015) studied this question.
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