Ultrathin, Gas-Selective Polyimide Membranes Prepared from Multilayer Polyelectrolyte Films
Ultrathin, Gas-Selective Polyimide Membranes Prepared from Multilayer Polyelectrolyte Films
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DOI：
10.1021/cm020639x
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发表时间：
2003
影响因子：
8.6
通讯作者：
D. M. S. and;M. Bruening
中科院分区：
文献类型：
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作者：
D. M. S. and;M. Bruening
聚酰胺盐和聚丙烯胺盐化物（PAH）交替静电沉积，然后热诱导亚胺化，在多孔氧化铝载体上得到超薄的气体选择性聚酰亚胺膜。这些膜之所以吸引人，是因为聚酰亚胺的稳定性和选择性，以及交替的聚电解质吸附允许形成超薄（低至35 - 40纳米）、无缺陷的薄膜，从而允许高通量。FTIR光谱显示，在250°C下加热2小时，聚酰胺/多环芳烃膜完全转化为相应的聚酰亚胺，扫描电镜显示均匀的薄膜，在衬底孔隙中沉积最少。三种不同的亚胺化聚酰胺/多环芳烃膜的渗透系数和选择性（O2/N2高达6.9，CO2/CH4高达68）与相应的体聚酰亚胺的文献值相当，前提是膜中聚酰胺与多环芳烃的比例很高（9:1）。静电…
Alternating electrostatic deposition of poly(amic acid) salts and poly (allylamine hydrochloride) (PAH) followed by heat-induced imidization yields ultrathin, gas-selective polyimide membranes on porous alumina supports. These membranes are appealing because of the stability and selectivity of polyimides and the fact that alternating polyelectrolyte adsorption allows formation of ultrathin (as low as 35−40 nm), defect-free films that allow high flux. FTIR spectroscopy shows that heating of poly(amic acid)/PAH membranes at 250 °C for 2 h completely converts the poly(amic acid) to the corresponding polyimide, and scanning electron microscopy reveals uniform films with minimal deposition in substrate pores. Permeability coefficients and selectivities (O2/N2 up to 6.9 and CO2/CH4 up to 68) of three different imidized poly(amic acid)/PAH membranes are comparable to literature values for the corresponding bulk polyimides, provided that the ratio of poly(amic acid) to PAH in the film is high (9:1). Electrostatic...