US 11,951,446 B2
Acryloyloxy-terminated polydimethylsiloxane (AC-PDMS)-based thin-film composite (TFC) membrane, and preparation method and use thereof
Gongping Liu, Jiangsu (CN); Yang Pan, Jiangsu (CN); and Wanqin Jin, Jiangsu (CN)
Assigned to NANJING TECH UNIVERSITY, Jiangsu (CN)
Filed by NANJING TECH UNIVERSITY, Jiangsu (CN)
Filed on Jun. 12, 2023, as Appl. No. 18/333,528.
Claims priority of application No. 202210665583.4 (CN), filed on Jun. 14, 2022.
Prior Publication US 2023/0398504 A1, Dec. 14, 2023
Int. Cl. B01D 53/22 (2006.01); B01D 67/00 (2006.01); B01D 69/02 (2006.01); B01D 69/10 (2006.01); B01D 69/12 (2006.01); B01D 71/70 (2006.01)
CPC B01D 71/701 (2022.08) [B01D 53/228 (2013.01); B01D 67/00113 (2022.08); B01D 67/0013 (2013.01); B01D 67/0018 (2013.01); B01D 69/02 (2013.01); B01D 69/105 (2013.01); B01D 69/107 (2022.08); B01D 69/12 (2013.01); B01D 2257/102 (2013.01); B01D 2257/104 (2013.01); B01D 2257/504 (2013.01); B01D 2323/12 (2013.01); B01D 2323/345 (2013.01); B01D 2325/04 (2013.01)] 6 Claims
OG exemplary drawing
 
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:

OG Complex Work Unit Chemistry
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:

OG Complex Work Unit Chemistry
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.