Synthesis and Gas-Transport Properties of Metathesis Polytricyclononenes Bearing Three Me3Si Groups per Monomer Unitстатья
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Дата последнего поиска статьи во внешних источниках: 25 апреля 2017 г.
Аннотация:A new metathesis polynorbornene containing three SiMe3 groups per monomer unit directly
connected to the norbornene moiety via SiC bonds is synthesized. The ring-opening
metathesis polymerization of sterically hindered 3,3,4-tris(trimethylsilyl)tricyclononene-7
is successfully
conducted in yields 80–85% in the presence of first generation Grubbs catalyst.
The corresponding polymer is obtained with molecular weight Mw up to 5.4 × 105 Da. It
is an amorphous glassy (Tg = 200 °C) polymer with high thermal stability. Gas permeability
and diffusivity coefficients are studied for a range of gases (He, H2, O2, N2, CO2, CH4). This
polymer containing three SiMe3 groups per monomer unit turns out to be more permeable
(P(O2) = 125 Barrer) than similar polymers with one or two
SiMe3 groups per monomer unit (P(O2) = 30–50 Barrer). Wide
angle X-ray diffraction, positron annihilating lifetime spectroscopy,
as well as Brunauer–Emmett–Teller investigations
are also performed and discussed.