New rheological method to measure diffusion coefficient of volatile liquids: Application to butylmethacrylate in molten polyethylene matrix

Abstract

A rheological method to assess the diffusion behavior of liquids in molten polymers above their boiling point is presented in this article. The evaporation of the liquid and the evolution of the blends complex modulus are followed by rheological measurement. Identification of the Fick's diffusion coefficient and the rate of evaporation of butylmethacrylate in low density polyethylene is done. The values of the diffusion coefficient are in agreement with those obtained by classical methods. The method developed here appears as complementary to the existent ones. It allows the measurement of diffusion coefficient of liquid/polymer system at high temperatures even for volatiles liquids.

Disparate dynamic viscoelastic responses of wheat flour doughs coated with different oils for preventing water evaporation during time sweeps and their mechanisms decoupled

“…For an inhomogeneous material probed using a parallel plate geometry, its storage modulus ( G 0 ) is the sum of the contributions of all the volume elements with different rheological properties, and can be calculated using Eq. (3) (Joubert et al 2001;Liotier et al 2010).…”