Polymer nanocomposite coatings based on polyhedral oligosilsesquioxanes: route for industrial manufacturing and barrier properties |
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Authors: | Ferdinand Männle Terje Rosquist Tofteberg Morten Skaugen Huaitian Bu Thijs Peters Pascal D C Dietzel Monika Pilz |
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Institution: | 1.SINTEF Materials and Chemistry,Oslo,Norway;2.University of Bergen,Bergen,Norway;3.Norwegian University of Life Sciences,?s,Norway |
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Abstract: | A route to a large variety of functionalized POSS compounds by a two-step procedure has been developed. Up-scaling to high
volume industrial applications is feasible. In the first step, an amino-functionalized silane such as 3-aminopropyltriethoxy
silane is converted to amino-functionalized POSS (amine-POSS) by a sol–gel process. In the second step, the amine groups of
amine-POSS are converted by state-of-the-art amine chemistry. A large number of reactants including carboxylic acids, esters,
anhydrides, isocyanates, carbonates, epoxides, and acrylates as well as reactants suitable for nucleophilic substitution can
be applied. Conversion of an amine-POSS with hexanoic acid leads to an amide-POSS. Amine chemistry can usually be performed
under mild conditions, which suppresses degradation and/or cross-linking reactions of the amine-POSS during the conversion.
MALDI-TOF mass spectroscopy and dynamic light scattering (particle size: 3–6 nm) have been applied to prove the conversion
of an amine-POSS to an amide-POSS. 1H-NMR and TGA-MS prove the presence of amide-POSS and its thermal stability. Gas barrier properties of nanocomposite coatings
based on functionalized POSS are characterized. |
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