Acryloyloxy-terminated polydimethylsiloxane (AC-PDMS)-based thin-film composite (TFC) membrane, and preparation method and use thereof

Patent metadata

Field	Value
Publication number	US-11951446-B2
Application number	US-202318333528-A
Country	US
Kind code	B2
Filing date	Jun 12, 2023
Priority date	Jun 14, 2022
Publication date	Apr 9, 2024
Grant date	Apr 9, 2024

Abstract

The present disclosure provides an acryloyloxy-terminated polydimethylsiloxane (AC-PDMS)-based thin-film composite (TFC) membrane, and a preparation method and use thereof. In the preparation method, a simple ultraviolet (UV)-induced monomer polymerization strategy based on high UV reactivity among acryloyloxy groups is adopted to prepare the AC-PDMS-based TFC membrane. The high UV reactivity among AC-PDMS monomers can induce the rapid curing of a casting solution to enable the formation of an ultra-thin selective layer and the inhibition of pore penetration for a substrate. By optimizing a UV wavelength, an irradiation time, and a polymer concentration, the prepared AC-PDMS-based TFC membrane has a CO2 penetration rate of 9,635 GPU and a CO2/N2 selectivity of 11.5. The UV-induced monomer polymerization strategy based on material properties provides a novel efficient strategy for preparing an ultra-thin PDMS-based membrane, which can be used for molecular separation.

First claim

What is claimed is:

1. A preparation method of an acryloyloxy-terminated polydimethylsiloxane (PDMS)-based thin-film composite membrane, wherein the acryloyloxy-terminated PDMS-based thin-film composite membrane comprises a support layer, and a selective separation layer on a surface of the support layer, and the selective separation layer has a structure shown as follows:

wherein R is linear or branched alkyl with 1 to 16 carbon atoms; the acryloyloxy-terminated PDMS-based thin-film composite membrane is used in gas separation; and
the preparation method comprises following steps:
step 1: dissolving acryloyloxy-terminated PDMS and a photoinitiator in a solvent to obtain a casting solution; and
step 2: coating the casting solution on the surface of the support layer, conducting ultraviolet irradiation to cure the acryloyloxy-terminated PDMS to obtain a resulting product, and subjecting the resulting product to a heat treatment at 60° C. to 90° C. for 5 min to 30 min to evaporate away excess solvent to obtain the PDMS-based thin-film composite membrane,
wherein in the step 1, a concentration of the acryloyloxy-terminated PDMS in the casting solution is 1 wt % to 25 wt %, a weight ratio of the acryloyloxy-terminated PDMS to the photoinitiator is (5-15):1, the solvent is a non-polar solvent, and the non-polar solvent is a hydrocarbon solvent or an ester solvent;
the step 1 further comprises adjustment of a viscosity of the casting solution by subjecting the casting solution to intermittent ultraviolet irradiation and stirring to control the viscosity of the casting solution at 35 cP to 55 cP; and
the acryloyloxy-terminated PDMS has a structure shown as follows:

wherein R is linear or branched alkyl with 1 to 16 carbon atoms; and
in the step 2, the support layer is subjected to a water-filling treatment in advance, the ultraviolet irradiation is conducted for 1 s to 30 s, and ultraviolet light for the ultraviolet irradiation is one selected from a group consisting of ultraviolet A (UVA), ultraviolet B (UVB), and ultraviolet C (UVC), or mixed light of two or more thereof.

2. The preparation method of the acryloyloxy-terminated PDMS-based thin-film composite membrane according to claim 1 , wherein a material of the support layer is a porous material.

3. The preparation method of the acryloyloxy-terminated PDMS-based thin-film composite membrane according to claim 2 , wherein the porous material is a porous ceramic or a porous polymer.

4. The preparation method of the acryloyloxy-terminated PDMS-based thin-film composite membrane according to claim 1 , wherein the selective separation layer has a thickness of 0.1 μm to 5 μm.

5. The preparation method of the acryloyloxy-terminated PDMS-based thin-film composite membrane according to claim 1 , wherein the ultraviolet light for the ultraviolet irradiation is mixed light of UVA and UVC.

6. An acryloyloxy-terminated PDMS-based thin-film composite membrane directly prepared by the preparation method as defined in claim 1 .

Assignees

• Nanjing University Of Technology

Inventors

• Liu Gongping
• Pan Yang
• Jin Wanqin

Classifications

• B01D71/701 Primary

  Polydimethylsiloxane · CPC title

• B01D53/228 Primary

  characterised by specific membranes · CPC title

• B01D67/00113

  Pretreatment of the casting solutions, e.g. thermal treatment or ageing · CPC title

• B01D67/0013

  Casting processes · CPC title

• B01D67/0018

  Thermally induced processes [TIPS] · CPC title