Star-Shaped Polydimethylsiloxanes with Organocyclotetrasilsesquioxane Branching-Out Centers: Synthesis and Properties
Yulia S. Dyuzhikova, Anton A. Anisimov, Аlexander S. Peregudov, Mikhail I. Buzin, Galina G. Nikiforova, В. Г. Васильев, S. A. Kostrov, A. I. Buzin, A. A. Stupnikov, Yu. N. Malakhova, Olga I. Shchegolikhina, Aziz M. Muzafarov
Abstract
-tetra(organo)(dimethylsiloxy)cyclotetrasiloxanes containing methyl-, tolyl- and phenyl-substituents at silicon atoms and the mixture of four stereoisomers of tetra[phenyl(dimethylsiloxy)]cyclotetrasiloxane as the cores were synthesized. Their thermal and viscous properties were studied. All synthesized compounds were characterized by a complex of physicochemical analysis methods: nuclear magnetic resonance (NMR), FT-IR spectroscopy, gel permeation chromatography (GPC), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), viscometry in solution, rheometry, and Langmuir trough study.