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Studies in the Area of Supramolecular Research Reported from Delft University of Technology [Polyborosiloxanes (PBSs), Synthetic Kinetics, and...

August 29, 2014

Studies in the Area of Supramolecular Research Reported from Delft University of Technology [Polyborosiloxanes (PBSs), Synthetic Kinetics, and Characterization]

By a News Reporter-Staff News Editor at Science Letter -- Investigators publish new report on Supramolecular Research. According to news reporting from Delft, Netherlands, by NewsRx journalists, research stated, "We synthesized polyborosiloxanes (PBSs) from poly(dimethylsiloxane) (PDMS) and boric acid (BA) by heating a mixture of these compounds to 200 degrees C. During the reaction the PDMS chains are subject to random scission, upon which the new chain ends get modified by -Si-O-(BO)(m)(OH)(n) moieties. This insight is based on gel permeation chromatography (GPC) results on the evolution of the molecular-weight distribution during the modification process, in combination with Fourier transform infrared (FTIR) spectroscopy to identify chemical moieties."

The news correspondents obtained a quote from the research from the Delft University of Technology, "We invented a refinement procedure in which the ill-defined polydisperse polar end groups can be converted into predominately borono, -Si-O-B(OH)(2), by hydrolysis of boroxane bonds, B-O-B, and subsequent removal of released BA. The resulting PBSs form supramolecular elastomers owing to hydrogen bonding among the end groups. The viscoelastic behavior of the supramolecular elastomers was investigated by dynamic rheometry, and we found that the dynamic moduli increases dramatically upon the modification, even though the mean degree of polymerization decrease. This is explained by the strong interactions between the modified chain ends. Furthermore, we found that by severe dehydration, the boranol groups are converted into boroxane bonds."

According to the news reporters, the research concluded: "Upon exposure to ambient humidity, these cross-links are hydrolyzed, and the supramolecular elastomer is recovered."

For more information on this research see: Polyborosiloxanes (PBSs), Synthetic Kinetics, and Characterization. Macromolecules, 2014;47(14):4531-4537. Macromolecules can be contacted at: Amer Chemical Soc, 1155 16TH St, NW, Washington, DC 20036, USA. (American Chemical Society -; Macromolecules -

Our news journalists report that additional information may be obtained by contacting Z. Liu, Delft University of Technology, Dept. of Chem Engn, NL-2628 BL Delft, Netherlands. Additional authors for this research include S.J. Picken and N.A.M. Besseling (see also Supramolecular Research).

Keywords for this news article include: Delft, Europe, Netherlands, Nanotechnology, Emerging Technologies, Supramolecular Research

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Source: Science Letter

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