Multilayer Polymeric Membrane and Process

摘要

Provided is a novel continuous single-step method of manufacturing a multilayer sorbent polymeric membrane having superior productivity, properties and performance. At least one layer of the polymeric membrane comprises sorbent materials and a plurality of interconnecting pores. The method includes: (a) coextruding layer-forming compositions to form a multilayer coextrudate; (b) casting the coextrudate into a film; (c) extracting the film with an extractant; and (d) removing the extractant from the extracted film to form the multilayer sorbent polymeric membrane. The sorbent membrane of this disclosure can find a wide range of applications for use in filtration, separation and purification of gases and fluids, CO2 and volatile capture, structural support, vehicle emission control, energy harvesting and storage, device, protection, permeation, packaging, printing, and etc.

主权项

1. A method for making a multilayer sorbent polymeric membrane comprising at least one layer comprising sorbent materials of about 5 wt. % to about 100 wt. % and a plurality of interconnecting pores, the method comprising:
(a) coextruding layer-forming compositions comprising a matrix polymer to form a multilayer coextrudate, wherein at least one of the layer-forming compositions further comprising the sorbent materials and a diluent; (b) cooling the multilayer coextrudate to form a multilayer film; (c) extracting the diluent from the multilayer film with an extractant; and (d) removing the extractant from the extracted film to form the multilayer sorbent polymeric membrane, wherein the matrix polymer is a film-forming thermoplastic polymer selected from the group of petroleum-based polymers, bio-based polymers, biodegradable polymers and combinations thereof; wherein the sorbent materials present in the at least one layer retain their initial sorbability and/or their initial porosity of about 50% to about 100%; wherein the at least one layer has a porosity of about 5% to about 85%; and wherein the multilayer sorbent polymeric membrane is asymmetric.