Negligible ageing in poly(ether-ether-ketone) membranes widens application range for solvent processing
Negligible ageing in poly(ether-ether-ketone) membranes widens application range for solvent processing
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DOI：
10.1016/j.memsci.2016.10.015
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发表时间：
2017-03-01
影响因子：
9.5
通讯作者：
Livingston, Andrew
中科院分区：
文献类型：
--
作者：
Burgal, Joao da Silva;Peeva, Ludmila;Livingston, Andrew
采用相转化法制备了聚醚醚酮（PEEK）有机溶剂纳滤膜。值得注意的是，即使在高温空气退火和腐蚀性溶剂的高温溶质过滤的极端条件下，这些膜也可以忽略老化。PEEK膜的这种可忽略的老化与交联聚苯并咪唑（PBI）和聚酰亚胺（PI）膜的实质性老化形成对比。在120℃的空气退火后，PBI和PI膜变脆，失去所有的渗透性，而PEEK膜保持弹性，并保持类似于0.2 L h(-1) m(-2) bar（-1）的四氢呋喃（THF）的恒定渗透性。PBI和PI膜的结构变化归因于聚合物从非平衡玻璃态向平衡态的转变，在平衡态下，链填料阻止了溶剂的渗透。三种聚合物膜在高达140摄氏度的DMF中进行高温过滤，结果表明PEEK的性能稳定，老化可以忽略不计，而PBI和PI的稳定性很快就会松动。
Organic solvent nanofiltration membranes have been prepared from poly(ether-ether-ketone) (PEEK) by phase inversion. Remarkably, these membranes undergo negligible ageing, even under extreme conditions of high temperature air annealing, and high temperature solute filtration with aggressive solvents. This negligible ageing of PEEK membranes is contrasted with substantial ageing of crosslinked polybenzimidazole (PBI) and polyimide (PI) membranes. After air annealing at 120 degrees C, PBI and PI membranes become brittle and lose all permeance, whereas PEEK membranes remain flexible and retain a constant permeance of similar to 0.2 L h(-1) m(-2) bar(-1) for tetrahydrofuran (THF). The structural change in PBI and PI membranes is attributed to polymer transition from a non-equilibrium glassy state towards an equilibrium state at which chain packing precludes permeation of solvent. High temperature filtrations in DMF up to 140 degrees C for the three polymeric membranes showed PEEK performance to be stable and consistent with negligible ageing, whereas PBI and PI rapidly loose stability.