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公开(公告)号：US20190211175A1
公开(公告)日：2019-07-11
申请号：US16099182
申请日：2017-06-30
Applicant: NANJING TECH UNIVERSITY
Inventor： Yong WANG , Weihong XING , Nanping XU
CPC classification number: C08J9/28 , C08J9/00 , C08J2201/0502 , C08J2201/0504 , C08J2205/042 , C08J2381/06 , C08J2387/00 , C08J2471/02 , C08L81/06 , C08L2203/14
Abstract: The present invention relates to a method for preparing nanoporous polysulfone-based polymers, including: a copolymer of a polysulfone polymer and a polar polymer is immersed into a compound swelling agent, and maintained for at least 1 minute above room temperature; the compound swelling agent is a “solvent pair” composed of the mixture of solvent A and solvent B; the solvent A has high affinity with the polysulfone polymer; and the solvent B has high affinity with the polar polymer; the treated copolymer is taken out from the compound swelling agent and then dried to remove the solvent to obtain the nanoporous polysulfone-based polymers.
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2.发明公开公开(公告)号：US20230191336A1
公开(公告)日：2023-06-22
申请号：US18001092
申请日：2022-03-23
Applicant: NANJING TECH UNIVERSITY
Inventor： Yong WANG , Dinglei ZHONG , Jiemei ZHOU
CPC classification number: B01D67/0027 , B01D69/08 , B01D71/80 , B01D67/002 , B01D71/68 , B01D71/5211
Abstract: The disclosure provides a method for preparing a hollow fiber membrane by melt spinning-stretching and selective swelling, including: preparing a nascent hollow fiber by melt spinning in an inert gas protective atmosphere by using an amphiphilic block copolymer as a film forming material, and stretching the nascent hollow fiber in the cooling process, a stretch rate being controlled at 200-540 mm/min, and a stretch ratio being controlled at 150-600%; immersing the obtained hollow fiber in a swelling solvent, and treating the hollow fiber in a water bath at 65° C. for 1 h; and then transferring the hollow fiber into a long-chain alkane solvent, treating the hollow fiber at the same temperature for 1-12 h, and after the completion of the treatment, immediately taking out the hollow fiber and drying the hollow fiber to obtain the hollow fiber membrane with a bicontinuous porous structure. By combining the melt spinning-stretching and the selective swelling, the method of the disclosure can synchronously and continuously improve the permeability and selectivity of the hollow fiber membrane. The treatment in the long-chain alkane solvent can make the polar chain excessively enriched on the surface of the membrane migrate inward, thereby improving the performance of the hollow fiber membrane.
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3.发明申请公开(公告)号：US20220203305A1
公开(公告)日：2022-06-30
申请号：US17596985
申请日：2020-06-19
Applicant: NANJING TECH UNIVERSITY
Inventor： Yong WANG , Yanjie WANG , Jiemei ZHOU
Abstract: The present invention provides a room-temperature selective swelling method of pore-forming used for preparing separation membranes, comprising: treating a dense membrane of an amphiphilic block copolymer by a composite swelling agent at 15-30° C. for 1 min-24 h, removing the residual solvent, then leaving the membrane at room temperature to dry, so as to obtain an amphiphilic block copolymer separation membrane with a bi-continuous porous structure, wherein the composite swelling agent is composed of 60-96% of a first swelling agent and 4-40% of a second swelling agent, the first swelling agent is an alcohol solvent, the second swelling agent is selected from any one or a mixture of two or more of toluene, styrene, tetrahydrofuran, 1,4-dioxane and so on. In the method of the invention, selective swelling can be achieved at room temperature, abating the energy consumption in membrane-forming process. The method has universality and can be widely used in the pore-forming process of various amphiphilic block copolymers. The swelling level and morphology can be controlled by adjusting the composition of the solvent in the swelling agent and the second swelling agent content in the swelling agent.
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