PVP改性PDMS/PAN中空纤维复合膜提升表面亲水性
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摘要
为了改善气体分离复合膜中聚二甲基硅氧烷(PDMS)过渡层与极性分离层的界面结合,利用高极性的聚乙烯吡咯烷酮(PVP)修饰聚丙烯腈(PAN)中空纤维支撑的PDMS气体分离膜表面,以提高PDMS表面极性和亲水性并减少对气体渗透速率的不利影响.利用X射线光电子能谱(XPS)证实利用溶液浸渍法可以将PVP接枝在PDMS表面对其修饰,并且随着浸渍时间的增加,PVP接枝量逐步增加,修饰效果逐渐增强.实验结果表明,交联剂1,3,5-苯三甲酰氯(TMC)增强了PDMS表面的PVP接枝改性,PVP修饰使PDMS表面的水接触角降低到21.1°,显著提高了PDMS表面亲水性和极性,从而有利于PDMS层和极性分离层的紧密结合. PVP修饰使得CO_2对其他气体(H_2、CH_4、N_2)的选择性随TMC/PDMS摩尔比的增加而逐渐降低,气体选择性CO_2/H_2、CO_2/CH_4、CO_2/N_2的最大峰值分别为3.9、3.8、11.8.
Polyvinyl pyrrolidone (PVP) with high polarity was adopted to modify the surface of PDMS layer supported on polyacrylonitrile(PAN) hollow fiber, in order to improve the polarity and hydrophily of PDMS layer surface and ensure the minimum negative effect on gas permeability. The employment of PVP was to enhance the interfacial cohesion of polydimethylsiloxane (PDMS) gutter layer and polar selective layer in gas separation composite membrane. X-ray photoelectron spectroscopy(XPS) was utilized to prove that PVP could be grafted to PDMS layer and modify its surface by dip-coating, and the grafting quality and modification of PVP increased and enhanced respectively with the increase of coating time. Results showed that the crosslinker 1,3,5-Benzenetricarbonyl trichloride(TMC) could improve the function of PVP grafting modification, and the surfacewater contact angel decreased to 21.1°, which meant that the surface polarity and hydrophily of PDMS layer were obviously improved and the PDMS layer and polar selective layer were tightly combined. In addition, with the increase of molar ratio of TMC/PDMS, CO_2/H_2, CO_2/CH_4 and CO_2/N_2 selectivity decreased gradually by PVP modification, peaking at 3.9, 3.8 and 11.8, respectively.
Polyvinyl pyrrolidone (PVP) with high polarity was adopted to modify the surface of PDMS layer supported on polyacrylonitrile(PAN) hollow fiber, in order to improve the polarity and hydrophily of PDMS layer surface and ensure the minimum negative effect on gas permeability. The employment of PVP was to enhance the interfacial cohesion of polydimethylsiloxane (PDMS) gutter layer and polar selective layer in gas separation composite membrane. X-ray photoelectron spectroscopy(XPS) was utilized to prove that PVP could be grafted to PDMS layer and modify its surface by dip-coating, and the grafting quality and modification of PVP increased and enhanced respectively with the increase of coating time. Results showed that the crosslinker 1,3,5-Benzenetricarbonyl trichloride(TMC) could improve the function of PVP grafting modification, and the surfacewater contact angel decreased to 21.1°, which meant that the surface polarity and hydrophily of PDMS layer were obviously improved and the PDMS layer and polar selective layer were tightly combined. In addition, with the increase of molar ratio of TMC/PDMS, CO_2/H_2, CO_2/CH_4 and CO_2/N_2 selectivity decreased gradually by PVP modification, peaking at 3.9, 3.8 and 11.8, respectively.
引文
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[28]LIN H Q,VAN WAGNER E,FREEMAN B D,et al.Plasticization-enhanced hydrogen purification using polymeric membranes[J].Science,2006,311(5761):639-642.
[29]PUTHIARA J P,LEE Y R,AHN W S.Microporous amine-functionalized aromatic polymers and their carbonized products for CO2 adsorption[J].Chemical Engineering Journal,2017,319:65-74.
[30]KAYNAK A,BARTLEY J P,GEORGE G A.FT-Raman spectroscopic study of the formation of polyenes during thermal degradation of poly(vinyl chloride)and poly(N-vinyl-2-pyrrolidone)blends[J].Journal of Macromolecular Sciencepure and Applied Chemistry,2001,38(10):1003-1048.
[2]LIN H Q,He Z J,Sun Z,et al.CO2-selective membranes for hydrogen production and CO2capture-part II:techno-economic analysis[J].Journal of Membrane Science,2015,493:794-806.
[3]张智恩.CO2在中空纤维膜内的吸收分离性能及其在PVA促进传递膜内的吸附特性[D].重庆:重庆大学,2015.ZHANG Zhi-en.CO2 absorption in a hollow fiber membrane contactor and its sorption characteristics in a PVA facilitated transport membrane[D].Chongqing:Chongqing University,2015.
[4]KANG Z X,XUE M,FAN L L,et al.Highly selective sieving of small gas molecules by using an ultra-microporous metal-organic framework membrane[J].Energy and Environmental Science,2014,7(12):4053-4060.
[5]全帅.CO2捕集用高性能PEO基气体分离膜的制备及性能研究[D].哈尔滨:哈尔滨工业大学,2015.QUAN Shuai.Preparation and properties of high performance PEO-based gas separation membranes for CO2 capture[D].Haerbin:Harbin Institute of Technology,2015.
[6]HUDIONO Y C,CARLISLE T K,LAFRATE A L,et al.Novel mixed matrix membranes based on polymerizable room-temperature ionic liquids and SAPO-34 particles to improve CO2 separation[J].Journal of Membrane science,2011,370(1/2):141-148.
[7]YANG L X,TIAN Z Z,ZHANG X Y,et al.Enhanced CO2 selectivities by incorporating CO2-philic PEG-POSS into polymers of intrinsic microporosity membrane[J].Journal of Membrane Science,2017,543:69-78.
[8]BARILLAS M K,ENICK R M,O'BRIEN M,et al.The CO2 permeability and mixed gas CO2/H2selectivity of membranes composed of CO2-philic polymers[J].Journal of Membrane Science,2011,371(1/2):29-39.
[9]陈可平,梁丽芸,谭必恩.亲二氧化碳碳氢聚合物及其应用[J].化学进展,2009,21(10):2199-2204.CHEN Ke-ping,LIANG Li-yun,TAN Bi-en.CO2-philic hydrocarbon polymers and their applications[J].Progress in Chemistry,2009,21(10):2199-2204.
[10]CAR A,STROPNIK C,YAVE W,et al.PEGmodified poly(amide-b-ethylene oxide)membranes for CO2 separation[J].Journal of Membrane Science,2008,307(1):88-95.
[11]代岩.氟化/共聚橡胶态聚合物气体分离膜制备及性能研究[D].大连:大连理工大学,2017.DAI Yan.Preparation and performance of fluorinated/copolymerized rubbery polymer gas separation membrane[D].Dalian:Dalian University of Technology,2017.
[12]QIAO Z H,WANG Z,YUAN S J,et al.Preparation and characterization of small molecular amine modified PVAm membranes for CO2/H2 separation[J].Journal of Membrane Science,2015,475:290-302.
[13]王薇,杜启云.中空纤维复合膜[J].高分子通报,2007,5:54-59.WANG Wei,DU Qi-yun.Hollow fiber composite membrane[J].Polymer Bulletin,2007,5:54-59.
[14]ZHOU S Y,ZOU X Q,SUN F X,et al.Challenging fabrication of hollow ceramic fiber supported Cu3(BTC)2 membrane for hydrogen separation[J].Journal of Materials Chemistry,2012,22(20):10322-10328.
[15]CHENG J,HU L Q,JI C F,et al.Porous ceramic hollow fiber-supported Pebax/PEGDME composite membrane for CO2 separation from biohythane[J].RSC Advances,2015,5(74):60453-60459.
[16]HU L Q,CHENG J,LI Y N,et al.In-situ grafting to improve polarity of polyacrylonitrile hollow fibersupported polydimethylsiloxane membranes for CO2separation[J].Journal of Colloid and Interface Science,2018,510:12-19.
[17]CHEN H Z,THONG Z W,LI P,et al.High performance composite hollow fiber membranes for CO2/H2 and CO2/N2 separation[J].International Journal of Hydrogen Energy,2014,39(10):5043-5053.
[18]YAVE W,CAR A,WIND J,et al.Nanometric thin film membranes manufactured on square meter scale:ultra-thin films for CO2 capture[J].Nanotechnology,2010,21(39):395301.
[19]SHAHSAVAN H,QUINN J,D'EON J,et al.Surface modification of polydimethylsiloxane elastomer for stable hydrophilicity,optical transparency and film lubrication[J].Colloids and Surfaces A:Physicochemical and Engineering Aspects,2015,482:267-275.
[20]AMIRILARGANI M,SADRZADEH M,SUDHOLTER E J R,et al.Surface modification methods of organic solvent nanofiltration membranes[J].Chemical Engineering Journal,2016,289:562-582.
[21]XIONG X H,WU Z Q,PAN J J,et al.A facile approach to modify poly(dimethylsiloxane)surfaces via visible light-induced grafting polymerization[J].Journal of Materials Chemistry B,2015,3(4):629-634.
[22]FU Y J,QUI H Z,LIAO K S,et al.Effect of uvozone treatment on poly(dimethylsiloxane)membranes:surface characterization and gas separation performance[J].Langmuir,2010,26(6):4392-4399.
[23]CHEN J T,FU Y J,TUNG K L,et al.Surface modification of poly(dimethylsiloxane)by atmospheric pressure high temperature plasma torch to prepare high-performance gas separation membranes[J].Journal of Membrane Science,2013,440:1-8.
[24]WU Y Z,HUANG Y Y,MA H W.A facile method for permanent and functional surface modification of poly(dimethylsiloxane)[J].Journal of American Chemical Society,2007,129(23):7226-7227.
[25]CEHN H,ZHANG Z,CHENG Y,et al.Protein repellant silicone surfaces by covalent immobilization of poly(ethylene oxide)[J].Biomaterials,2005,26(15):2391-2399.
[26]CHEN H,BROOK M A,SHEARDOWN H.Silicone elastomers for reduced protein adsorption[J].Biomaterials,2004,25(12):2273-2282.
[27]毕秋艳,田野,李倩,等.PVDF中空纤维膜改性研究(1)交联PVP制备亲水化PVDF中空纤维膜[J].膜科学与技术,2012,32(6):22-27.BI Qiu-yan,TIAN Ye,LI Qian,et al.Study on the modification of PVDF membrane(1)preparation of hydrophilic PVDF hollow fiber membrane with PVPvia cross-linking reaction[J].Membrane Science and Technology,2012,32(6):22-27.
[28]LIN H Q,VAN WAGNER E,FREEMAN B D,et al.Plasticization-enhanced hydrogen purification using polymeric membranes[J].Science,2006,311(5761):639-642.
[29]PUTHIARA J P,LEE Y R,AHN W S.Microporous amine-functionalized aromatic polymers and their carbonized products for CO2 adsorption[J].Chemical Engineering Journal,2017,319:65-74.
[30]KAYNAK A,BARTLEY J P,GEORGE G A.FT-Raman spectroscopic study of the formation of polyenes during thermal degradation of poly(vinyl chloride)and poly(N-vinyl-2-pyrrolidone)blends[J].Journal of Macromolecular Sciencepure and Applied Chemistry,2001,38(10):1003-1048.