摘要
讨论了氧在甲基丙烯酸辛酯 乙烯基咪唑共聚物 钴卟啉复合膜中的溶解和扩散过程,用二元输送模型分析了间α,α,α,α-四(邻三甲基乙酰胺苯基)钴卟啉(CoP)作为氧载体的复合膜氧输送性能.研究发现,固定在聚合物中的CoP与氧可逆地络合和解络合,其络合平衡常数K为14mol- 1 L ,根据吸附实验结果计算出氧在基体聚合物中的物理溶解度系数kD 为4 4×10 - 5cm3(STP)cm- 3Pa- 1 .聚合物 载体复合膜除了物理渗透外,氧还可通过与载体的络合和解络合而扩散,从而促进氧的输送.氧通过载体的扩散系数(DC)和通过基体聚合物的物理扩散系数(DD)的比值为0 0 8.
The dissolution and diffusion processes of oxygen in and through poly ( octyl methacrylate-co-vinylimidazole) (OIm)/cobaltporphyrin complexed membranes were discussed. Facilitated oxygen transport through a polymer membrane containing meso-alpha, alpha, alpha, alpha-tetrakis (o-pivalamidophenyl) porphyrinatocobalt ( Cop) as a fixed oxygen carrier was analyzed by a dual-mode transport model. It was found that CoP fixed in the solid membrane rapidly and reversibly bound with oxygen and the oxygen-binding equilibrium constants of CoP ( K) was 14 mol(-1)L. The oxygen absorption for the CoP-OIm membrane obeyed a Langmuir-type isotherm, while the nitrogen absorption showed a proportional increase with nitrogen pressure according to Henry's law. The physical solubility coefficient of oxygen (k(D)) in the polymer matrix was calculated to be 4.4 x 10(-5) cm(3) (STP) cm(-3) Pa-1 according to the adsorption results. Oxygen permeability coefficients (Po-2) of the OIm-CoP membranes steeply increased with a decrease in the pressure difference (Po-2) while Po-2 for the control membrane composed of inactive ( oxidized) Co(III) P was small and independent of po(2) indicating that the CoP carrier fixed in the membrane, interacts with oxygen and facilitates oxygen transport. The facilitation factor ( G) that indicates the degree of facilitated transport was 9. The ratio of the diffusion coefficient of oxygen for hopping between the fixed carriers (D-C) to the physical diffusion coefficient of oxygen through the matric polymer (D-D) was 0.08.
出处
《高分子学报》
SCIE
CAS
CSCD
北大核心
2005年第3期345-349,共5页
Acta Polymerica Sinica
基金
国家自然科学基金资助项目 (基金号 5 0 3 73 0 3 5)
