Conversion of the surface layers of poly(vinyl chloride) into aminoethyl podand nanofilms as a matrix at the surface of borane-selective sorbents

Proton-conducting sorption-active cyclam-based layers on chemically modified PVC surfaces of cellulose fabric

“…In one subrange, a nonlinear change in -logσ is observed, while, in the other subrange, -logσ-C a dependences are close to linear. As was noted above, in the case of Н + conducting membranes, the -logσ-C a depen dence is linear in the acid concentration range where an SPME is formed in the polymer [1][2][3][4]. In our situation, the position of the boundary between the two subranges depends on the cyclam and acid natures.…”

“…The use of such fabric as a bridge, which is located in an adsorber between the anodic and cathodic spaces, makes it possible to convert adsorbed compounds, which are susceptible to protonation, into cations dur ing the migration of Н + ions in the layer and transfer the resulting particles to the catholyte. As was shown in [1,2], it is possible to create such materials for the adsorption-electrochemical processes on the basis of cellulose fabric, the fibers of which are encapsulated in polyvinyl chloride (PVC) chemically modified with ethanol cyclam (EC) or acetate cyclam (AC) layers with the adsorption active surfaces and inner voids connected to the surface via cyclam rings as described in [3][4][5]. According to [1,5], upon the effect of acids on cyclams, amino groups are bound in HА + (H n -1 X) -salt structures, where A is the cyclam amino group and X = Cl -, or which form aggregates SO 2 4 , − PO 3 4 , − PO 3 4 , − with acid molecules in porous layers.…”

“…As was shown in [1,2], it is possible to create such materials for the adsorption-electrochemical processes on the basis of cellulose fabric, the fibers of which are encapsulated in polyvinyl chloride (PVC) chemically modified with ethanol cyclam (EC) or acetate cyclam (AC) layers with the adsorption active surfaces and inner voids connected to the surface via cyclam rings as described in [3][4][5]. According to [1,5], upon the effect of acids on cyclams, amino groups are bound in HА + (H n -1 X) -salt structures, where A is the cyclam amino group and X = Cl -, or which form aggregates SO 2 4 , − PO 3 4 , − PO 3 4 , − with acid molecules in porous layers. Fabrics covered with the above surface layers can act as Н + conducting bridges at the unchanged universal adsorption activity [1,2].…”

“…According to [1,5], upon the effect of acids on cyclams, amino groups are bound in HА + (H n -1 X) -salt structures, where A is the cyclam amino group and X = Cl -, or which form aggregates SO 2 4 , − PO 3 4 , − PO 3 4 , − with acid molecules in porous layers. Fabrics covered with the above surface layers can act as Н + conducting bridges at the unchanged universal adsorption activity [1,2]. At the same time, a relation between the proton conductivity and the formation of HА + (H n -1 X) -clus ters composed of acid molecules and cyclam groups is not found.…”

“…The structure of porous EC and AC layers with the inner voids on the surface of chemically modified PVC, which encapsu lates cellulose fabric fibers, has much in common with the structure of polymers, which serve as the basis of Н + conducting membranes. The skeleton structure of the polymers involves acid and salt ammonia groups, and there are voids (free spaces) in the bulk of the polymer [1][2][3][4]. In order to initiate the proton conduc tivity across the membrane, the voids should be filled with hydrated acid molecules that form a solid poly mer matrix electrolyte (SPME) with acid or salt ammonia groups.…”