The scaling analysis of thermooxidative degradation of poly(arylatearylene sulfonoxide)

Abstract

It is shown that scaling relationships adequately describe the process of oxygen consumption in the course of thermooxidative degradation of poly(arylatearylene sulfonoxide). The correspondence of the experimental curve amount of the consumed oxygen time to one or another scaling relationship allows the definition of the mechanism of thermooxidative degradation. So, for poly-(arylatearylene sulfonoxide), the mode of autodeceleration corresponds to the attack by oxygen molecules of the polymeric macromolecules reactive centers, and the mode of autoacceleration corresponds to the reaction of low molecular radicals.

The theoretical estimation of effective spectral dimension for polymer melts

“…Differentiating a relationship (Equation 9) about time t and equating the derivative dQ / dt to the similar derivative in the equation (8), we shall receive19: where C 1 is a constant, which can be estimated from the boundary conditions,19 and the values k d are accepted according to the data of Batyrova 7. The value Q is defined as ratio N / N , where N is the amount of consumed oxygen in an arbitrary moment of time t , and N is the amount of oxygen required for full oxidation of aliphatic and aromatic groups of studied polymers ( N ≈ 25 moles O 2 /basis mole20).…”

“…The glass transition temperature T g of the studied copolymers is defined by the dielectric method. The studies are carried out by quantometer BM‐560 “Tesla” (Prague, Czechia) at frequency 1 MHz 7…”

“…O 2 /mole of polymer. The kinetic curve oxygen consumption N ( t ) is obtained within temperature range 573–723 K 7…”

Methods of describing oxidation reactions in fractal spaces

“…The glass transition temperature ( T g ) of the studied copolymer was determined by a dielectric method with a Tesla BM‐560 quantometer at a frequency of 1 MHz over the temperature range 293–573 K 5. The T g value for PAASO was found to be 471 K.…”