公开(公告)号：US11938472B2

公开(公告)日：2024-03-26

申请号：US17527652

申请日：2021-11-16

Applicant: RENSSELAER POLYTECHNIC INSTITUTE

Inventor： Sangwoo Lee ,  Chulsung Bae ,  Musashi J. Briem ,  Sungmin Park

IPC: B01J41/07 ,  B01D61/44 ,  B01D71/06 ,  B01J41/14 ,  B01J47/12 ,  C02F1/469 ,  C08F212/32 ,  C08J5/22

CPC classification number: B01J41/07 ,  B01D61/44 ,  B01D71/06 ,  B01J41/14 ,  B01J47/12 ,  C02F1/469 ,  C08F212/32 ,  C08J5/2287 ,  C08F2810/00

Abstract: The anion exchange membranes exhibit enhanced chemical stability and ion conductivity when compared with traditional styrene-based alkaline anion exchange membranes. A copolymer backbone is polymerized from a reaction medium that includes a diphenylalkylene and an alkadiene. The copolymer includes a plurality of pendant phenyl groups. The diphenyl groups on the polymer backbone are functionalized with one or more haloalkylated precursor substrates. The terminal halide from the precursor substrate can then be substituted with a desired ionic group. The diphenylethylene-based alkaline anion exchange membranes lack the α-hydrogens sharing tertiary carbons with phenyl groups from polystyrene or styrene-based precursor polymers, resulting in higher chemical stability. The ionic groups are also apart from each other by about 3 to 6 carbons in the polymer backbone, enhancing ion conductivity. These membrane are advantageous for use in fuel cells, electrolyzers employing hydrogen, ion separations, etc.

公开(公告)号：US12220691B2

公开(公告)日：2025-02-11

申请号：US18607624

申请日：2024-03-18

Applicant: RENSSELAER POLYTECHNIC INSTITUTE

Inventor： Sangwoo Lee ,  Chulsung Bae ,  Carrie Lynn Trant

IPC: B01J41/14 ,  C08F212/08 ,  C08F212/32 ,  C08J5/22

Abstract: An anion exchange membrane is composed of a copolymer of 1,1-diphenylethylene and one or more styrene monomers, such as 4-tert-butylstyrene. The copolymer includes a backbone substituted with a plurality of ionic groups coupled to phenyl groups on the backbone via hydrocarbyl tethers between about 1 and about 7 carbons in length. High-temperature conditions enabled by these copolymers enhance conductivity performance, making them particularly suitable for use in anion exchange membranes in fuel cells, electrolyzers employing hydrogen, ion separations, etc. The properties of the membranes can be tuned via the degree of functionalization of the phenyl groups and selection of the functional groups, such as quaternary ammonium groups. Several processes can be used to incorporate the desired ionic functional groups into the polymers, such as chloromethylation, radical bromination, Friedel-Crafts acylation and alkylation, sulfonation followed by amination, or combinations thereof.

公开(公告)号：US11969723B2

公开(公告)日：2024-04-30

申请号：US17901985

申请日：2022-09-02

Applicant: RENSSELAER POLYTECHNIC INSTITUTE

Inventor： Sangwoo Lee ,  Chulsung Bae ,  Carrie Lynn Trant

IPC: B01J41/14 ,  C08F212/08 ,  C08F212/32 ,  C08J5/22

CPC classification number: B01J41/14 ,  C08F212/08 ,  C08F212/32 ,  C08J5/2231 ,  C08J2325/08

Abstract: An anion exchange membrane is composed of a copolymer of 1,1-diphenylethylene and one or more styrene monomers, such as 4-tert-butylstyrene. The copolymer includes a backbone substituted with a plurality of ionic groups coupled to phenyl groups on the backbone via hydrocarbyl tethers between about 1 and about 7 carbons in length. High-temperature conditions enabled by these copolymers enhance conductivity performance, making them particularly suitable for use in anion exchange membranes in fuel cells, electrolyzers employing hydrogen, ion separations, etc. The properties of the membranes can be tuned via the degree of functionalization of the phenyl groups and selection of the functional groups, such as quaternary ammonium groups. Several processes can be used to incorporate the desired ionic functional groups into the polymers, such as chloromethylation, radical bromination, Friedel-Crafts acylation and alkylation, sulfonation followed by amination, or combinations thereof.

公开(公告)号：US11207672B2

公开(公告)日：2021-12-28

申请号：US17287639

申请日：2019-10-22

Applicant: RENSSELAER POLYTECHNIC INSTITUTE

Inventor： Sangwoo Lee ,  Chulsung Bae ,  Musashi J. Briem ,  Sungmin Park

IPC: B01J41/07 ,  C08F212/32 ,  C08J5/22 ,  B01J47/12 ,  B01D61/44 ,  C02F1/469 ,  B01D71/06 ,  B01J41/14

Abstract: The anion exchange membranes exhibit enhanced chemical stability and ion conductivity when compared with traditional styrene-based alkaline anion exchange membranes. A copolymer backbone is polymerized from a reaction medium that includes a diphenylalkylene and an alkadiene. The copolymer includes a plurality of pendant phenyl groups. The diphenyl groups on the polymer backbone are functionalized with one or more haloalkylated precursor substrates. The terminal halide from the precursor substrate can then be substituted with a desired ionic group. The diphenylethylene-based alkaline anion exchange membranes lack the α-hydrogens sharing tertiary carbons with phenyl groups from polystyrene or styrene-based precursor polymers, resulting in higher chemical stability. The ionic groups are also apart from each other by about 3 to 6 carbons in the polymer backbone, enhancing ion conductivity. These membrane are advantageous for use in fuel cells, electrolyzers employing hydrogen, ion separations, etc.