AI Article Synopsis
- Five bis(dimethylsilyl)-m-carborane-siloxane polymers were studied using various NMR techniques to understand their chemical structure and composition.
- The main findings included the identification of chemical shifts and the assignment of signals, confirming the structure through 2D NMR spectroscopy.
- Results indicated that Dexsil 300 had a consistent microstructure, while Dexsil 400 and Dexsil 410 showed partial regular sequences, with certain impurities detected in the m-carborane structure.
Article Abstract
Five bis(dimethylsilyl)-m-carborane-siloxane polymers with methyl, phenyl, and 2-cyanoethyl ligands were characterized by (1)H, (11)B, (13)C, and (29)Si nuclear magnetic resonance (NMR) spectroscopy. All relevant chemical shifts are reported, whereas signal assignment was confirmed by 2D NMR spectroscopy. The chemical composition of the polymers was calculated from the (1)H and (29)Si NMR spectra. Only (29)Si NMR spectroscopy was able to quantify the methoxy end group, from which the average molecular weights were calculated. The copolymer Dexsil 300 turned out to have a regular microstructure, whilst the terpolymers Dexsil 400 and Dexsil 410 have only partly regular sequences. (11)B NMR spectroscopy confirmed the m-carborane structure and revealed some low molecular weight impurities.
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| http://dx.doi.org/10.1016/j.chroma.2006.07.061 | DOI Listing |
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