the authors examine the effect of small additions (0. 5-10 by wt. ) of oligomeric epoxides based on polyethylene oxide and epichlorohydrin having an epoxide group content of 8-15 on the rheological and optical properties of concentrated ca solutions, and also on the thermophysical and mechanical properties of ca films. as modifiers the authors used two oligomeric epoxides having a viscosity-average molecular weight of 500, containing one or two terminal epoxy groups - oligomer oligomer monoepoxide (ome) and oligomer diepoxide (ode), respectively. the objectives of this study were cellulose acetates prepared from wood and cotton cellulose, with an acetic acid content of 54. 6 and a degree of polymerization (dp) of 250 and 240, respectively. it is shown that, in the first stages of degradation, the modifiers are effective thermostabilizers (at a content from 0. 5 to 10 of the weight of the ca). the devitrification region of the modified specimens is shifted in the low-temperature direction by 5-33 $degree$ c on increase of the oligomer content from 2 to 15; the relative elongation rises by a factor of 1. 2 to 3. under the influence of the modifiers, the viscosity and turbidity of concentrated ca solutions are reduced; the specific bulk electrical resistance of films containing modifiers is reduced by several orders of magnitude. 6 refs