Metathesis polymerization of tricyclononenes containing tri(n-alkoxy)silyl substituents with long n-alkyl fragments (from six to ten carbon atoms) and addition polymerization of tri(n-decyloxy)silyltricyclononene were investigated. Polymerization conditions were found that make it possible to synthesize high-molecular-weight products (M-w more than 5x10(5)) with desired yields (75-90%). The resulting polymers were characterized by NMR spectroscopy, X-ray phase analysis, differential scanning calorimetry, and thermogravimetric analysis. The gas transport properties of a polymer based on tri(n-decyloxy)silyltricyclononene obtained by metathesis polymerization were studied. It was shown that this polymer is characterized by a high separation selectivity with respect to the n-butane/methane gas pair (44).
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