Polydimethylsiloxane (PDMS) is widely employed as an intermediate layer in gas separation composite membranes.However,the inherently strong hydrophobicity of PDMS results in weak adhesion at the interface with most CO2-selective materials,significantly compromising membrane separation performance and lifespan.Therefore,surface modification is imperative.Using a nonwoven fabric-based polysulfone membrane as the support layer and PDMS as the selective layer,amino-modified PDMS composite membranes were prepared by adding amino-crosslinking agents,pre-crosslinking and controlled heat treatment,which realized the functional modification of the PDMS surface and the improvement of the hydrophilicity.Simultaneously,the adverse effects of crosslinking agents with side-chain functionalities on membrane spatial structure were effectively mitigated,maintaining high CO2 permeance and selectivity.The influence of 3-aminopropyltrimethoxysilane (APTMS) mass on the structure and the performance of the composite membrane were systematically investigated.The results showed that the composite membrane exhibited optimal comprehensive performance when the mass ratio of MAPTMS to MPDMS was 0.8,with a CO2 permeance of 5437.407GPU and a CO2/N2 selectivity of 10.680.When m(APTMS)∶m(PDMS)>0.4,the water contact angle on membrane surface was less than 91°,representing a reduction of over 22% compared to that of the unmodified PDMS composite membrane (117.84°).
[1] 余静秋,吴小军,束长朋,等.基于圈形二胺的六元环聚酰亚胺共聚物膜的制备与气体分离性能研究[J].化工新型材料,2023,51(3):89-94.
[2] Sandru M,Sandru E M,Ingram W F,et al.An integrated materials approach to ultrapermeable and ultraselective CO2 po-lymer membranes[J].Science,2022,376(6588):90-94.
[3] Jiang X,Goh K,Wang R.Air plasma assisted spray coating of Pebax-1657 thin-film composite membranes for post-combustion CO2 capture[J].Journal of Membrane Science,Amsterdam:Elsevier,2022,658:120741.
[4] Liu J,Pan Y,Xu J,et al.Introducing amphipathic copolymer into intermediate layer to fabricate ultra-thin pebax composite membrane for efficient CO2 capture[J].Journal of Membrane Science,Amsterdam:Elsevier,2023,667:121183.
[5] Zheng N,Liu J,Wang G,et al.Robust UV/moisture dual curable PDMS-microcapsule-silica functional material for self-healing,antifouling,and antibacterial applications[J].Nano Research,2023,16(5):7810-7819.
[6] 吕宏峰,闫卫平,刘志环,等.紫外/臭氧法PDMS表面亲水改性机理研究[J].光谱学与光谱分析,2016,36(4):1033-1037.
[7] Gouveia S L,Oliveira V,Ferraria M,et al.Processing of poly(ionic liquid)-ionic liquid membranes using femtosecond (fs) laser radiation:effect on CO2 separation performance[J].Journal of Membrane Science,Amsterdam:Elsevier,2022,642:119903.
[8] 雍佳乐,杨青,陈烽,等.飞秒激光仿生制备极端浸润性表面[J].科学通报,2019,64(12):1213-1237.
[9] Bui V,Satti V R,Haddad E,et al.Ultrathin polyorganosilica membranes synthesized by oxygen-plasma treatment of po-lysiloxanes for H2/CO2 separation[J].Journal of Membrane Science,2023,688:122099.
[10] Zhu L,Huang L,Venna S R,et al.Scalable polymeric few-nanometer organosilica membranes with hydrothermal stability for selective hydrogen[J].ACS Nano,Washington:Amer Chemical Soc,2021,15(7):12119-12128.
[11] Pan Y,Guo Y,Liu J,et al.PDMS with tunable side group mobility and its highly permeable membrane for removal of aromatic compounds[J].Angewandte Chemie International Edition,2022,61(6):202111810.
[12] 高继发,赵丹,孙健,等.溶胀法改性聚二甲基硅氧烷及在多层复合膜中的应用[J].膜科学与技术,2023,43(3):44-53.
[13] Li P P,Shareef U,Xu Z L,et al.Epoxide-based PDMS TFC membrane fabricated via the T-FLO technique for the phenol separation[J].Journal of Membrane Science,2022,641:119937.
[14] Hu L,Cheng J,Li Y,et al.Amino-functionalized surface modification of polyacrylonitrile hollow fiber-supported polydimethylsiloxane membranes[J].Applied Surface Science,2017,413:27-34.
[15] Zhao G,Rui K,Dou S X,et al.Heterostructures for electrochemical hydrogen evolution reaction:a review[J].Advanced Functional Materials,2018,28(43):1803291.
[16] Chuah C Y,Goh K,Yang Y,et al.Harnessing filler materials for enhancing biogas separation membranes[J].Chemical Reviews,2018,118(18):8655-8769.
[17] Ferreira P,Carvalho Á,Correia T R,et al.Functionalization of polydimethylsiloxane membranes to be used in the production of voice prostheses[J].Science and Technology of Advanced Materials,2013,14(5):55006.
[18] 肖娴,徐小尘,李琇廷,等.含聚醚链段聚酰亚胺膜的制备及气体分离性能[J].高分子学报,2022,53(5):505-513.
[19] 赵烨,丘晓琳,王杰,等.胺化木质素磺酸钠插层水滑石/Pebax混合基质膜的制备及气体分离性能研究[J].化工新型材料,2024,52(3):102-108.
[20] Li L,Miyazaki S,Wu Z,et al.Continuous direct air capture and methanation using combined system of membrane-based CO2 capture and Ni-Ca based dual functional materials[J].Applied Catalysis B:Environmental,2023,339:123151.
基金资助
国家自然科学基金重点项目(52336007);中央高校基本科研业务费专项资金项目(2242023k30026)
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