Ring‐opening metathesis polymerization of norbornenes with organosilicon substituents. Gas permeability of polymers obtained

Abstract

Polymers of norbornenes with %Me3 and Si(Me2)CH,SiMe3 groups were synthesized and mass transfer properties of the polymers were studied. Ring-opening polymerizations of these monomers were realized in the presence of homogeneous WC16-based and heterogeneous Re,O,-based metathesis catalysts. Introduction of silicon-containing groups in the polynorbornene main chain results in a drastic increase of the permeability (P) and diffusion (0) coefficients for different biatomic and multiatomic gases. Comparison of polymers having SiMe, and Si(Mez)CH2SiMe3 substituents shows lower permeability and diffusion coefficients in the latter case. The combination of transport properties (Pi values) and separation factors aii = Pi/Pj of the two new silicon-containing polynorbornenes permits one to consider them as representatives of the most permeable and sufficiently permselective group of polymers. Transport properties of the polymers studied were analysed on the basis of the free volume approach. CCC 0025-1 16)</91/$03.00

Synthesis of high-Tg polymers by ring-opening metathesis polymerization of N-cycloalkylnorbornene dicarboximide

“…Copolymers at all compositions gave only one T g and these values are in between the T g values of the two homopolymers. Thus, adamantane containing norbornene resulted in a polymer with a dramatically much higher T g compared to unsubstituted norbornene (271 vs. 38 (3130) °C). The T g values of the copolymers increased linearly with increasing incorporation of 3a and 3b .…”

Macromolecular Design and Synthesis of Polymers from Silicon- Containing Norbornenes for Membrane Gas Separation

“…Finally, the most promising results were achieved upon combination of these two approaches in the design and synthesis of new polynorbornenes for membrane gas separation. The first examples of the effect of introduction of siliconcontaining groups on the gas permeability of polynorbornenes were described in references [81][82] (Figs. 2, 3).…”

Synthesis of hydrogenated functional polynorbornene (HFPNB) and rheology of HFPNB-based miscible blends with hydrogen bonding

“…PNBs with functional groups usually are obtained via ROMP of the corresponding norbornene derivatives [15][16][17][18][19][20][21]. However, it has been reported that some functional groups such as hydroxyl and carboxylic groups would decrease the reactivity of the catalysts used for ROMP [22].…”