Modelling the Kinetics of Desorption of Ingredients from Polymers

Abstract

An analysis is made of approaches to developing models for predicting the kinetics of desorption of ingredients of different nature and designation from polymers of different chemical structure. The applicability of the models is shown, depending on the type of ingredient and the conditions of the processes of their desorption from polymeric materials. The limitations in the development of a universal model for predicting the kinetics of desorption of different ingredients from polymers under different service conditions are established.

Accelerated in vitro oxidative degradation testing of polypropylene surgical mesh

“…One potential hypothesis for the higher extent of damage in Mesh 3 and Mesh 4 could be related to their smaller filament diameter and higher % porosity than Mesh 1 and Mesh 2. The diffusion of oxidants and AO in the polymer bulk is described by Fick's second law and their diffusivity is inversely proportional to sample thickness 61,62 . Therefore, the higher % porosity and the lower diffusion distance allow for faster diffusion of oxidants in Mesh 3 and Mesh 4 which may lead to earlier onset of oxidative degradation of the polymer and increased oxidative damage.…”

“…The diffusion of oxidants and AO in the polymer bulk is described by Fick's second law and their diffusivity is inversely proportional to sample thickness. 61,62 Therefore, the higher % porosity and the lower diffusion distance allow for faster diffusion of oxidants in Mesh 3 and Mesh 4 which may lead to earlier onset of oxidative degradation of the polymer and increased oxidative damage. Furthermore, the higher AO content (based on OIT) and presence of additives (based on the two recrystallization peaks in the blue filaments of Mesh 4) may explain the higher number of transverse cracks and filament breakage in Mesh 4 compared to Mesh 3.…”