Addition-type poly(norbornene)s with siloxane substituents: synthesis, properties and nanoporous membrane

Study on the influence of reaction time on the structure and properties of the PVDF membrane modified through the method of atom transfer radical polymerization

“…On the other hand, at temperatures above the LCST, the PNIPAAm can be assumed a more compact or collapsed conformation, resulting in the opening of the pores of the membrane []. As a result, the water flux became higher than that at the permeating temperature below the LCST []. Especially, when the permeating temperature changed in LCST, the water flux suddenly increased.…”

Synthesis and Gas‐Transport Properties of Novel Copolymers Based on Tricyclononenes Containing One and Three Me3Si‐Groups

“…Thus, permeability coefficient P (O 2 ) increased up to 1400 Barrer (extra 36% in comparison with PTCNSi1) demonstrating nonlinear increase of gas permeability with the increase of TCNSi3 content. The same trends were observed for random copolymers of other classes . Usually sharp growth of permeability was observed when the more rigid monomer unit content increased in copolymer composition.…”

“…The same trends were observed for random copolymers of other classes. [17,18] Usually sharp growth of permeability was observed when the more rigid monomer unit content increased in copolymer composition. For example, it was shown that the increase of more bulky 5-tris(trimethylsiloxy) silylnorborne units (TMSONB) in random norbornene/5tris(trimethylsiloxy)silylnorborne copolymers resulted in nonlinear increase of oxygen permeability.…”

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

“…Typically they composed of a transition metal salt (palladium or nickel acetate or acetylacetonate) as a precatalyst and an organoboron compound (B(C 6 F 5 ) 3 , Ph 3 C + [B(C 6 F 5 ) 4 ] -, or Na + [(3,5-(CF 3 ) 2 (C 6 H 3 ) 4 ] -) as a cocatalyst. The addition of a phosphine (e.g., tricyclohexylphosphine) to the Pd system afforded an increase in the molecular masses of the resulting polymers with silicon-containing side groups [7,109].…”

“…Finkelshtein, INEOS OPEN, 2018, 1 (1 Si-O-Si linkers. For these purpose, several norbornenes bearing siloxane moieties were synthesised and their behaviour under conditions of addition polymerization was studied (Scheme 13) [109,119]. It was found that (η 3 -C 3 H 5 )(η 5 -C 5 H 5 )Pd/PCy 3 /[Ph 3 C] + [B(C 6 F 5 ) 4 ]catalytic system is more suitable for addition polymerization of these monomers than Ni(acac) 2 /B(C 6 F 5 ) 3 , since it afforded homopolymers featuring higher molecular masses (up to 8.8·10 5 vs. (5-8)·10 4 (M w )) in higher yields (41-55% vs. 12-45%).…”