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题名: Synthesis, characterization, and gas permeation properties of copolyimides
作者: Wang Lina1;  Cao Yiming1;  Zhou Meiqing1;  Qiu Xiaozhi1;  Yuan Quan1
关键词: 6FDA ;  copolyimide ;  permeability ;  gas separation
刊名: ACTA POLYMERICA SINICA
发表日期: 2008-08-01
期: 8, 页:753-758
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Polymer Science
研究领域[WOS]: Polymer Science
英文摘要: The goal of this work is to explore new polyimide materials that exhibit both a high permeability and a high selectivity for specific gases. Copolyimides offer the possibility of preparing membranes with gas permeabilities and selectivities not obtainable with homopolyimides. A series novel fluorinated copolyimides were synthesized with various diamine compositions by chemical imidization in a two-pot procedure. Polyamic acids were prepared by stoichiometric addition of solid dianhydride in portion wise to the diamine ( s) The gas permeation behavior of 2,2'-bis ( 3, 4'-dicarboxyphenyl) hexafluoropropane dianhydride ( 6FDA)-2, 6-diamine toluene ( DAT)/1, 3-phenylenediamine ( mPDA) polyimides were investigated. The physical properties of the copolyimides were characterized by IR, DSC, and TGA. Glass transition temperature increased with increase in DAT content. All the copolyimides were soluble in most of the common solvents. The gas permeabilities coefficients decreased with increasing mPDA content; however, the permselectivity of gas pairs such as H-2/N-2, O-2/N-2, and CO2/CH4 was enhanced with the incorporation of mPDA moiety. The permeability coefficients of H-2, O-2, N-2, CO2 and CH4 were found to decrease with the increasing order of kinetic diameters of the penetrant gases. 6FDA-2,6-DAT/mPDA (3 : 1) copolyimide and 6FDA-2,6-DAT polymide had high separation properties for H-2/N-2, O-2/N-2 CO2/CH4. The H-2, O-2 and CO2 permealtilities were 64.99 Barrer, 5.22 Barrer, 23. 87 Barrer and 81.96 Barrer, 8.83 Barrer, 39.59 Barrer respectively at 35 degrees C and 0.2 MPa ( 1 Barrer = 7.5 x 10(-14) cm(3) (STP)center dot cm center dot cm-2 center dot s(-1)center dot Pa-1); and the ideal selectivities of H-2/N-2, O-2/N-2 and CO2/CH4 were 69.61, 6.09, 63.92 and 53.45, 5.76, 57.41, respectively. Moreover, all of the copolyimides studied in this work exhibited performance near, lying on or above the existing upper bound trade-off line between permselectivity and permeability. It may be utilized as commercial gas separation membrane material.
关键词[WOS]: POLYMERIC MEMBRANES ;  PERMEABILITY ;  SEPARATION ;  POLYIMIDE
语种: 英语
WOS记录号: WOS:000258728100004
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/140963
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Dalian Inst Chem Phys, Dalian 116023, Peoples R China

Recommended Citation:
Wang Lina,Cao Yiming,Zhou Meiqing,et al. Synthesis, characterization, and gas permeation properties of copolyimides[J]. ACTA POLYMERICA SINICA,2008(8):753-758.
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