US 11,654,402 B2
Polyacid-functionalized porous membranes, related methods, and related polyacid polymers
Merlin L. Bruening, East Lansing, MI (US); Salinda Wijeratne, East Lansing, MI (US); Wenjing Ning, East Lansing, MI (US); Jinlan Dong, East Lansing, MI (US); and Weijing Liu, East Lansing, MI (US)
Assigned to BOARD OF TRUSTEES OF MICHIGAN STATE UNIVERSITY, East Lansing, MI (US)
Filed by BOARD OF TRUSTEES OF MICHIGAN STATE UNIVERSITY, East Lansing, MI (US)
Filed on Sep. 15, 2020, as Appl. No. 17/21,105.
Application 17/021,105 is a division of application No. 15/524,483, granted, now 10,773,217, previously published as PCT/US2015/058971, filed on Nov. 4, 2015.
Claims priority of provisional application 62/076,286, filed on Nov. 6, 2014.
Prior Publication US 2021/0001284 A1, Jan. 7, 2021
Int. Cl. B01D 69/14 (2006.01); B01D 67/00 (2006.01); B01D 69/02 (2006.01); B01D 71/40 (2006.01); B01D 71/60 (2006.01); B01D 71/38 (2006.01); B01D 71/64 (2006.01); B01D 71/82 (2006.01); C08L 73/02 (2006.01); C08L 77/02 (2006.01)
CPC B01D 69/142 (2013.01) [B01D 67/0088 (2013.01); B01D 67/0093 (2013.01); B01D 69/02 (2013.01); B01D 69/141 (2013.01); B01D 69/144 (2013.01); B01D 71/38 (2013.01); B01D 71/40 (2013.01); B01D 71/60 (2013.01); B01D 71/64 (2013.01); B01D 71/82 (2013.01); C08L 73/02 (2013.01); C08L 77/02 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A polyacid-coated porous membrane comprising:
(a) a porous membrane substrate comprising a plurality of membrane pores; and
(b) a polyacid layer adsorbed on surfaces of the membrane pores, the polyacid layer comprising a polyacid polymer comprising repeating units comprising a pendent metal-binding ligand comprising one or more free acid groups selected from the group consisting of carboxylic acid groups, carboxylate groups, and combinations thereof;
wherein:
the polyacid layer is stably adsorbed on the surfaces of the membrane pores and is substantially free of covalent attachments to the surfaces of the membrane pores; and
the repeating units are selected from the group consisting of:
(i) repeating units comprising a nitrogen atom (N) present in a backbone portion of the repeating units;
(ii) repeating units comprising (A) an amide group (—C(═O)NH— or —C(═O)NR—) linking the pendent metal binding ligand and the polyacid polymer backbone, and (B) a pendent alkyl or heteroalkyl group on the polyacid polymer backbone at the same location as the amide group; and
(iii) repeating units comprising an oxygen atom (O) present in a backbone portion of the repeating units.