Colloid and Polymer Science

, Volume 290, Issue 18, pp 1879–1891 | Cite as

Synthesis and characterization of cationic silsesquioxane hybrids by hydrolytic condensation of triethoxysilane derived from 2-(dimethylamino)ethyl acrylate

  • Hideharu MoriEmail author
  • Masato Yamada
Original Contribution


A new family of silsesquioxane hybrids was synthesized by hydrolytic condensation of a triethoxysilane precursor, R-Si(OCH2CH3)3, R = -CH2CH2CH2N[CH2CH2COOCH2CH2N(CH3)2]2, derived from 2-(dimethylamino)ethyl acrylate. Condensation of the triethoxysilane precursor proceeded as a homogeneous system in methanol in the presence of aqueous HF solution (3.2 %) to afford the water-soluble silsesquioxane hybrid having a high density of chemically bonded peripheral tertiary amino groups on the outermost surface, as confirmed by nuclear magnetic resonance and Fourier transform infrared analyses. The relatively low polydispersity (M w/M n  = 1.33) and a reasonable molecular weight (M n  = 2700), corresponding to species having 6–12 silicon atoms, were confirmed by size exclusion chromatography. The size of the silsesquioxane hybrid (1.7 nm) was also determined by X-ray diffraction. Co-condensation of tetraethoxysilane (TEOS) with the triethoxysilane precursor was carried out under different feed ratios, and water-soluble products were obtained in the cases of TEOS molar ratio up to 40 %. Quaternization reaction of the tertiary amine-containing hybrids with methyl iodide led to cationic silsesquioxane hybrids containing quaternized amine functionalities, which showed good solubility in polar solvents. Scanning force microscopy measurements indicated the formation of the cationic silsesquioxane hybrids having relatively narrow size distribution with average particle diameter (about 2.0 nm) without aggregation.


Silsesquioxane Cationic hybrid Water-soluble nanoparticle Organic–inorganic hybrid 



This work was supported by Saneyoshi scholarship foundation.

Supplementary material

396_2012_2726_MOESM1_ESM.doc (2.4 mb)
ESM 1 (DOC 2459 kb)


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Copyright information

© Springer-Verlag 2012

Authors and Affiliations

  1. 1.Department of Polymer Science and Engineering, Graduate School of Science and EngineeringYamagata UniversityYonezawaJapan

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