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Porous membranes including pentablock copolymers and method of making same

A technology of block copolymers and porous membranes, applied in chemical instruments and methods, membranes, membrane technology, etc., can solve problems such as scaling up, brittle nature limiting bending, and handling tolerance

Pending Publication Date: 2019-07-09
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The brittle nature of cast films limits their resistance to bending and handling
Furthermore, their synthesis requires the use of temperatures below -70 °C, making scale-up exceptionally challenging

Method used

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  • Porous membranes including pentablock copolymers and method of making same
  • Porous membranes including pentablock copolymers and method of making same
  • Porous membranes including pentablock copolymers and method of making same

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0069] A suitable method for preparing the pentablock involves the steps of a) anionic polymerization of a B block monomer (such as styrene) using a functional initiator, b) allowing a C block monomer (such as isoprene ene) polymerization, c) coupling the block polymer formed in steps a) and b) using a coupling agent, deprotecting, and further combining the polymer coupled in step c) with a ring-opening polymerizable monomer (such as ethylene oxide) polymerization.

[0070] In this method, the ends of the RO-BC-Li block copolymers are coupled using a coupling agent to generate RO-CBC-OR block copolymers such that substantially each polymer chain has An initiator residue at the end of a polymer chain. The coupling agent is present in the backbone of the CBC polymer chain in a minimal proportion. Suitable coupling agents include, in solution, dihalogenated compounds; diacid chlorides; diacid bromides; dichloro compounds; dibromosilanes and dichlorosilanes, and difunctional com...

Embodiment approach 1

[0093] Embodiment 1 is a porous membrane comprising an ABCBA block copolymer, and the membrane includes a plurality of pores. The A block is immiscible with each of the B and C blocks; the B block has a T of 90 degrees Celsius or higher g , and is present in an amount ranging from 30% to 80% by weight of the total block copolymer, inclusive; and the C block has a T of 25 degrees Celsius or less g , and is present in an amount ranging from 10% to 40% by weight of the total block copolymer, inclusive.

Embodiment approach 2

[0094] Embodiment 2 is the porous membrane of embodiment 1, wherein the pores comprise an average pore diameter at the surface of the membrane in the range of 1 nanometer (nm) to 500 nm, inclusive.

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Abstract

The present disclosure provides a porous membrane made of pentablock copolymer. The porous membrane includes an ABCBA block copolymer and has a number of pores. The A block is immiscible with each ofthe B block and the C block, the B block has a glass transition temperature (Tg) of 90 degrees Celsius or greater, and the C block has a Tg of 25 degrees Celsius or less. The A block comprises a poly(alkylene oxide), a substituted epoxide, a polylactam, or a substituted carbonate; B block comprises a vinyl aromatic monomer or a polyalkylmethacrylate and C block comprises a polyacrylate, a polysiloxane or a polyisoprene. A method of making a porous membrane is also provided. The method includes forming a film or a hollow fiber from a solution including a solvent and solids containing an ABCBA block copolymer. The method further includes removing at least a portion of the solvent from the film or the hollow fiber and contacting the film or the hollow fiber with a nonsolvent.

Description

technical field [0001] The present disclosure relates to the field of porous polymer membranes. Background technique [0002] A porous material is a material that has a porous structure that allows fluid to pass through it easily. Porous membranes are suitable for use in a wide range of divergent applications, including use in fluid filtration for removal of solid particulates, use in ultrafiltration for removal of colloidal substances from fluids, as diffusion barriers or separators in electrochemical cells body, and in gas separation and pervaporation. Porous membranes have also been used to filter antibiotics, beer, oils, bacterial fermentation broths, and to analyze air, microbial samples, intravenous fluids, and vaccines. [0003] Porous membranes based on block copolymers are of interest. Recently, the combination of solvent-induced phase separation (SIPS) and block copolymer materials has been shown to obtain membranes with unique homoporous morphology and high flu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/80B01D67/00C08F297/04C08F299/02
CPCB01D71/80C08F297/04B01D69/02B01D69/08B01D71/50C08F2810/40C08F297/046C08L71/02C08G65/2612C08G2650/24C08F297/023B01D2325/0212B01D71/4011B01D2325/0283C08F8/12
Inventor 米歇尔·M·莫克卡尔·A·拉斯科夫斯基卢卡斯·D·麦金托什亚森特·L·莱彻卡蒂莫西·M·吉拉德小克林顿·P·沃勒
Owner 3M INNOVATIVE PROPERTIES CO
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