Photosynthetic membranes. A model study of the influence of photoinitiated grafting and graft polymerization of 1,6-hexanediol diacrylate and 4-(N-ethyl,N-2-acryloxyethyl)amino-4′-nitro-azobenzene, as co-monomers, onto polypropylene ribbon, on permeation and diffusion coefficients of oxygen and nitrogen

I.R. Bellobono, B. Marcandalli, E. Selli, D. Comi, L. Righetto
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引用次数: 8

Abstract

Photoinitiated grafting and graft polymerization of 1,6-hexanediol diacrylate (I) and 4-(N-ethyl,N-2-acryloxyethyl)amino-4′-nitro-azobenzene (II) as co-monomers with a fixed molar ratio I:II equal to 10, in the presence of 1,2-diphenyl-2,2-dimethoxyethanone (III) as photoinitiator with a ratio R of its molar concentration of 0.005-0.38 with respect to the sum of molar concentrations of I and II, were studied using a polypropylene ribbon as a model system of a macroporous substrate. By polychromatic irradiation at 45°C with energy inputs of 90 mW cm−2, ultrathin layers of co-polymer, able to function as asymmetric membranes, could thus be obtained. Mean polychromatic quantum yields of grafting and graft polymerization, as a function of R, were also measured. Membrane specimens with constant values of grafted (200±20) and graft polymerized (500±80) molecules of monomer units in co-polymer per unit apparent surface (Å2) have been subjected to measurements of permeabilities (P) and diffusivities (D) at 25°C for oxygen and nitrogen, as a function of R. Results show that only an optimum R minimizes P and D, and a narrow range of R-values allows a normal membrane behaviour.

光合膜。共单体1,6-己二醇二丙烯酸酯和4-(n -乙基,n -2-丙烯氧氧乙基)氨基-4′-硝基偶氮苯在聚丙烯带上光引发接枝和接枝聚合对氧和氮渗透扩散系数影响的模型研究
Photoinitiated嫁接和接枝聚合的6-hexanediol丙烯酸(我)和4 -制成(N-ethyl, N-2-acryloxyethyl) amino-4 -nitro-azobenzene(2)与一个固定的摩尔比率co-monomers我:II等于10,在1,2-diphenyl-2, 2-dimethoxyethanone (III)的光比R的摩尔浓度0.005 - -0.38对I和II的摩尔浓度的总和,研究了使用聚丙烯丝带作为大孔底物的模型系统。在45°C下,以90 mW cm−2的能量输入进行多色辐照,可以获得具有不对称膜功能的超薄共聚物层。同时测定了接枝和接枝聚合的平均多色量子产率随R的变化。在25°C的氧气和氮气条件下,以单位表观表面接枝(200±20)和接枝聚合(500±80)共聚物单体分子为单位(Å2)的膜样品进行了渗透率(P)和扩散率(D)的测量,结果表明,只有最佳的R才能使P和D最小化,并且R值的窄范围允许正常的膜行为。
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