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Side Chain Silicon Polyimide

Jul 18, 2023

Side-chain silicon-containing polyimides have less research than main-chain silicon-containing polyimides. The polyimide containing silicon on the side chain is mainly obtained by polymerizing dianhydrides or diamines with hydroxyl groups to obtain polyimides with antelope groups, and then reacting with hydrogen radicals to obtain polyimides with siloxane side chains. Polyimide. Or first synthesize an active diamine monomer that does not contain an active group at one end and contains two amino functions at the other end.

Graft copolymerized polyimide: the siloxane oligomer with one end of diamine group is copolymerized with aromatic dianhydride and diamine to obtain siloxane grafted polyamide acid, which is heated and dehydrated at 100~400 ° C to produce modified polyimide, that is, a comb type graft copolymer with polyimide as the main chain and polysiloxane as the branch chain is obtained, which can be made into a film with good mechanical strength, excellent heat resistance and solvent resistance, high gas and liquid permeability and separation. This copolymer was synthesized and used as a gas separation membrane material. This membrane has a two-phase separation structure and excellent mechanical properties. However, they use polyimide components with low permeability, so the gas separation performance of the obtained membrane is poor; If the polyimide component with good gas permeability is used, the gas separation membrane with good gas separation performance may be obtained.

Some studies have shown that polyimides with siloxane side chains can obtain flexible films. As the side chain increases, the glass transition temperature, strength, and modulus decrease, while the elongation increases. The introduction of siloxane can reduce the relative dielectric constant of polyimide and the erosion of oxygen resistant plasma, but the C-0-Si bond is unstable to water.

Another kind of side chain polyimide is to introduce POSS (polyhedral oligo) into its side chain ­ Meric silsesquioxanes) cage like siloxane structure. Octahedron (RSi01 S pressure can form nanopores with a diameter of 0 3~0.4nm rigid cubic silicon oxide core. Having a very low density. The purpose of this molecular design is to obtain materials with low dielectric constant and overcome the reduction of Strength of materials and high cost due to the introduction of pregnancy.

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