| Abstract: | Copolymers of polydiethylene glycol maleate-sebacates and styrene have been investigated. The degree of crosslinking ( ) has been estimated by a physical method (p) from the Mooney — Rivlin equation and Wall's formula and also by a chemical method (c) based on hydrolysis of the copolymer in an alkaline medium. In most cases the difference between the values of calculated from the Mooney — Rivlin equation and Wall's formula does not exceed 20%. It is shown that a linear correlation exists between p and c. The fact that the values of p are lower than those of c is attributable to the specific characteristics of the molecular network — the presence of short chain segments between neighboring network points and nonload-bearing free ends.Scientific-Research Institute of Plastics, Moscow. Translated from Mekhanika Polimerov, No. 6, pp. 963–968, November–December, 1971. |
