Gas transport properties of poly(ether-b-amide) segmented block copolymers
Gas transport properties of poly(ether-b-amide) segmented block copolymers
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DOI：
10.1002/1099-0488(20000801)38:15
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发表时间：
2000-08
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影响因子：
--
通讯作者：
V. Bondar;B. Freeman;I. Pinnau
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文献类型：
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作者：
V. Bondar;B. Freeman;I. Pinnau
在相分离的聚醚-b-聚酰胺嵌段共聚物中，在35 °C和高达15个大气压的压力下测定H2、N2和CO2的渗透性能。这些聚合物含有聚（环氧乙烷）[PEO]或聚（四氢呋喃）[PTMEO]作为橡胶状聚醚相和尼龙-6 [PA 6]或尼龙-12 [PA 12]作为硬质聚酰胺相。极高的极性（或四极）/非极性气体的选择性，加上高CO2渗透系数，观察值。在CO2渗透系数约为220 × 10−10 cm 3（STP）cm/（cm 2 s cmHg）的聚合物中，CO2/H2选择性高达9.8，CO2/N2选择性高达56。随着聚醚量的增加，渗透性增加。具有较低极性成分的聚合物，PTMEO和PA 12，比那些含有更极性的PEO和PA 6单元的聚合物的透气性更高。CO2/N2和CO2/H2选择性在具有较高浓度极性基团的聚合物中较高。这些高选择性值源自有利于CO2的大溶解度选择性。由于CO2大于H2，因此具有比H2低的扩散系数，橡胶状聚醚相（其是大部分气体渗透的场所）的弱尺寸筛分能力也有助于高CO2/H2选择性。© 2000约翰威利父子公司聚合物科学杂志B：聚合物物理38：2051-2062，2000
The permeation properties of H2, N2, and CO2 were determined at 35 °C and pressures up to 15 atm in phase-separated polyether-b-polyamide segmented block copolymers. These polymers contain poly(ethylene oxide) [PEO] or poly(tetramethylene oxide) [PTMEO] as the rubbery polyether phase and nylon-6 [PA6] or nylon-12 [PA12] as the hard polyamide phase. Extremely high values of polar (or quadrupolar)/nonpolar gas selectivities, coupled with high CO2 permeability coefficients, were observed. CO2/H2 selectivities as high as 9.8 and CO2/N2 selectivities as high as 56 were obtained in polymers with CO2 permeability coefficients of approximately 220 × 10−10 cm3(STP) cm/(cm2 s cmHg). As the amount of polyether increases, permeability increases. Gas permeability is higher in polymers with less polar constituents, PTMEO and PA12, than in those containing the more polar PEO and PA6 units. CO2/N2 and CO2/H2 selectivities are higher in polymers with higher concentrations of polar groups. These high selectivity values derive from large solubility selectivities in favor of CO2. Because CO2 is larger than H2 and has, therefore, a lower diffusion coefficient than H2, the weak size-sieving ability of the rubbery polyether phase, which is the locus of most of the gas permeation, also contributes to high CO2/H2 selectivity. © 2000 John Wiley & Sons, Inc. J Polym Sci B: Polym Phys 38: 2051–2062, 2000