Synthesis and Characterization of Monofunctionalized Polyhedral Oligomeric Silsesquioxanes by Cohydrolytic and Cocondensation of Propyltrimethoxysilane and Vinyltrimethoxysilane

Abstract

A monofunctional POSS [Si 8 O 12 (CH CH 2 )(C 3 H 7 ) 7 ] was synthesized by the cohydrolysis and cocondensation of propyltrimethoxysilane and vinyltrimethoxysilane in methanol solvent under acidic conditions. Then, the structure of the product was investigated using FT-IR, 1 H-NMR, 29 Si-NMR and XRD. Experimental results indicated that the mole rate of propyls and vinyls attached on POSS was approximately 7:1, which was controlled through altering the ratio of two monomers. Furthermore, the TGA result also showed a rapid mass loss began at temperature over 218 • C due to the degradation or sublimation of POSS itself. The new method, in comparison with the conventional corner-capping method, offered us another simple and effective access to preparing this kind of monofunctional POSS.

Synthesis and properties of hybrid core–shell poly(alkyltrialkoxysiloxane) latex

“…Polytrialkoxysiloxane molecular chain segments are folded and rotated during the formation of Si-O-Si bonds through the reaction between Si-OH and Si-OR, and the alkyl chain faces outward to reduce the interaction between silica chains and the surface tension. [32][33][34][35] The alkoxide groups are hydrolysed to produce primary nuclei. These small nuclei then aggregate to form seed particles during the first stage of the reaction.…”

Functionalized Polysilsesquioxane-Based Hybrid Silica Solid Amine Sorbents for the Regenerative Removal of CO2 from Air

“…FT-IR spectrum (Figure S1) of MAHSM features Si–O–Si str at 1138 and 1039 cm –1 . The peak 1138 cm –1 is characteristic of caged (T 8 ) silsesquioxane, − and the one at 1039 cm –1 may be attributed to ladder/network polysilsesquioxane. − Also, the “peak shape” in 1030–1130 cm –1 range is generally being considered as the characteristic of structured silsesquioxane . Other spectral bands are for vinyl (3060, 1410 cm –1 ), amino propyl (3367, 3291, 2933, and 1602 cm –1 ), and Si–OH (964 cm –1 ).…”