氟涂层对聚合物-钴卟啉膜氧气输送性能及其寿命的影响

采用在聚合物-钴卟啉(CoP)膜表面旋转涂覆氟涂料法,制备了氧/氮分离膜.研究表明,与未涂层膜相比,氟涂层膜中的CoP与氧表观结合平衡常数、膜的氧渗透系数和氧/氮选择性没有发生明显变化.随氟涂层厚度增加,氧渗透系数稍有降低,但水蒸汽渗透系数显著降低.由于氟涂层的憎水性,使涂层膜的水蒸汽渗透系数显著降低,氧载体CoP与氧结合寿命延长了4倍.

Effect of a Fluoro-coating on Oxygen Transport Performance and Lifetime of a Polymer-cobaltporphyrin Membrane

A membrane having a long lifetime was prepared by spin-coating a perfluororesin on the polymer-cobaltporphyrin membrane, while the coating had no significant effect on the oxygen permeability and oxygen/nitrogen selectivity of the membrane. The oxygen-binding properties of CoP and facilitated oxygen transport of the coated membrane were also studied. It was found that CoP fixed even in the coated membrane had rapid and reversible oxygen-binding properties in response to the partial oxygen pressures and the apparent oxygen-binding equilibrium constants of CoP were not influenced by the coating. Oxygen permeation was selectively facilitated with CoP fixed in the perfluororesin-coated membrane, whereas the water vapor permeability was significantly suppressed in comparison with that of the uncoated membrane. With increasing the coating thickness, the oxygen permeability coefficients slightly decreased, but the water vapor permeability coefficients significantly decreased. The lifetime of the CoP as an oxygen-carrier in the perfluororesin-coated membrane was prolonged, which was attributed to the hydrophobic property of the coating.