Solvent diffusion mechanism of PMMA/ acetone coated glass fiber fabric during curing process

Abstract

Fabric it is not an impermeable substrate because of fiber porosity. To study the solvent diffusion mechanism of coated fabric in the curing process, the drying model of PMMA/acetone coated glass fiber fabric was established. This drying model was verified by confocal Raman spectroscopy. Finally, the impact of fabric structure, thickness and porosity on the solvent diffusion process in coated fabrics was studied by the model. It was shown that the predicted solvent concentrations by the model were consistent with the experimental values. This model can be used to quantitatively calculate the solvent concentration at any position and at any time inside the coating film during the drying process. Moreover, it can also predict the curing time and residual solvent concentration of the coating fabric required to reach drying equilibrium. Compared with coated 3/1 twill, 5/3 satin and 2/1 twill, the solvent diffusion of coated plain fabric was faster during curing. Under the same environmental conditions, the thinner the fabric was and the greater the porosity was, the shorter the curing time was. The fitting equations for fabric thickness, fabric porosity and drying time were obtained, which can provide a theoretical guidance for the preparation, performance research and drying conditions optimization of PMMA coated textile materials.

Determination of constant diffusion coefficient for error function solution of diffusion equation using film-roll method

“…Three-dimensional diffusion has been applied to solvent diffusion into a fabric with a geometric structure. 8 But, in many cases, one-dimensional diffusion has been applied, such as solvent diffusion in polymers and gas diffusion in coal seams. 6,9 Since a diffusing substance moves from a region of high concentration to a region of low concentration across a concentration gradient, the majority of experiments are designed to measure the diffusion coefficient for one-dimensional diffusion.…”