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US 2025/0188233 A1Published application
Multiblock copolymer films, methods of making same, and uses thereof
AssigneesCornell University, Yale University
InventorsUlrich B. Wiesner, Rachel M. Dorin, Joerg Werner, William A. Phillip
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Abstract
A method for forming an isoporous graded film comprising multiblock copolymers and isoporous graded films. The films have a surface layer and a bulk layer. The surface layer can have at least 1×1014 pores/m2 and a pore size distribution (dmax/dmin)) of less than 3. The bulk layer has an asymmetric structure. The films can be used in filtration applications.
Claims21
1)-2) (canceled)
21) A method for forming an isoporous graded film of a multiblock copolymer comprising the steps of:
- a) forming a film comprising a triblock copolymer in a solvent system, the triblock copolymer comprising
- (i) a first terminal block incorporating a hydrophobic polymer, wherein the first terminal block has a glass transition temperature (Tg) of 25° C. or less, and wherein the hydrophobic polymer is selected from the group consisting of poly(isoprene), poly(butadiene), poly(butylene), and poly(isobutylene);
- (ii) a second terminal block comprising a hydrogen-bonding polymer selected from the group consisting of poly((4-vinyl)pyridine), poly((2-vinyl) pyridine), poly(ethylene oxide), a poly(methacrylate), poly(acrylic acid), and poly(hydroxystyrene);
- and
- (iii) a hydrophobic block located between the first terminal block and the second terminal block, the hydrophobic block selected from the group consisting of a poly(styrene), polyethylene, polypropylene, polyvinyl chloride, and polytetrafluoroethylene,
- b) removing at least a portion of the solvent system from the film;
- and
- c) contacting the film from step b) with a phase separation solvent system, such that the isoporous graded film is formed.
5 more elements
Dependencies are inferred from the claim text.