Abstract
New non-crystallizable low-dispersity star-shaped polydimethylsiloxanes (PDMS) containing stereoregular cis-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.
Highlights
Creation of polymers with new macromolecular architecture is one of the principal driving forces in the development of polymer science
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
NMR spectra were registered on Bruker AvanceTM 600 spectrometer (Bruker, Berlin, Germany) operating at 600.22, 150.93 and 119.26 MHz for 1H, 13C, and 29Si cores, respectively, and Bruker Avance II 300 (Bruker). 1H and 13C chemical shifts were measured relative to residual signals of corresponding solvents and calculated to tetramethylsilane. 29Si chemical shifts were measured relative to external standard - tetramethylsilane
Summary
Creation of polymers with new macromolecular architecture is one of the principal driving forces in the development of polymer science. Among a vast variety of macromolecular structures, a big class of branched high-molecular compounds is distinguished. Bright representatives of this class are the star-shaped polymers (SSP). These are branched macromolecules in which the arms (linear polymers) ‘grow’ from one branching center (core). An important parameter for such polymers is the number of arms, their functionality and molecular weight. The main feature of SSPs distinguishing them from linear analogs of identical molecular masses is their compact structure (smaller hydrodynamic volume, and, less viscosity) and possible wider functionality [4–6]
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