Sorption properties of gelatinous films modified by clinoptilolite rocks
Abstract
This article is devoted to the problem of obtaining modified gelatin films with controlled swelling and dissolution. The mechanically activated high-silica (silicate module more than 4) clinoptilolite rocks, a highly dispersed fraction with a particle size of not more than 71 microns were used as modifiers in this study. The presence of surface silanol groups in clinoptilolite capable of interacting with the carboxyl or amino groups of gelatin macromolecules via intermolecular hydrogen bonds directly or through a layer of water molecules allows considering the possibility of additional structural strengthening. The purpose of this study was the synthesis of polymer-mineral materials based on gelatin and mechanically activated clinoptilo-lite rocks, as well as the investigation of the degree of swelling and dissolution of polymer-mineral films in aqueous media.
Filled polymer systems were prepared by mixing a gelatin solution with an aqueous suspension of a highly dispersed fraction of zeolites. The interaction of gelatin with a mechanically activated clinoptilolite filler will improve the interfacial adhesion and limit the mobility of polymer chains, which is equivalent to the formation of additional structural network nodes. Using optical microscopy and gravimetry, we studied the morphology of modified gelatin films and the sorption of water vapour and vapours of saturated sodium chloride and potassium chloridesolutions.
The presence of coagulation structures was revealed at the content of a mineral particulate filler of 0.5 wt. % and the spherical shape of particles of the filler, relatively uniformly distributed in volumes of 2.5 and 5 g/dl of gelatin matrices. It was revealed that films absorb water vapours better than vapours of saturat-ed electrolyte solutions. It was found that the addition of 0.5 wt. % mechanically activated clinoptilolite rocks in a gelatin solution of 5 g/dl allowed obtaining films with a reduced degree of swelling. The degree of swell-ing was reduced by 8 times in water vapour and by at least 2-3 times in vapours of sodium chloride or potas-sium chloride. Taking into account the safety and excellent sorption properties of clinoptilolite rocks, the results obtained in this study can be recommended for use in general medicine and veterinary medicine.
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