Development of a mathematical model for the effect of temperature and relative humidity on the water vapour permeability of plastic films

Abstract

The water vapour permeability constants o f three flexible films (LDPE, PET and a laminate of both films) were determined at 20,30 and 40 "C and from 55 t o 90% relative humidities. The relationship between permeability and temperature followed the Arrhenius model for the three films. The relative humidity also influenced the permeability o f the films. A mathematical model describing permeance (P/Xthe permeability o f laminates or films) as a function of external relative humidity and temperature was developed. The model can be used t o predict the permeance o f the three films a t different temperatures and relative humidities.

Determination of the spreading pressure and shelf-life of spray-dried coffee powder: quality assurance of a water-soluble food

“…The E p values were in the same order as those reported for the permeation of nitrogen and methane in a glassy polymer with a low free volume fraction (Yampolskii et al, 1998). In addition, the activation energies obtained in the present study were similar to those published by Kulchan et al (2010), of 21-22 kJ/mol, for LDPE and OPP films, and higher than that reported by Samaniego-Esguerra and Robertson (1991), of 11-12 kJ/mol, for PET/LDPE laminates.…”

“…In general, the permeance values estimated with the linear model were not significantly different from the GAB models. The watervapor-permeances values of the packaging material were lower than those reported for PET/LDPE laminates, of 7-11×10 −4 g/ m 2 dPa in a range of 20-40 °C and 55-90% RH (Samaniego-Esguerra and Robertson, 1991), and similar to those pf PETmet/LDPE films, with values around 1.8-2.64 ×10 −4 g/ m 2 dPa at 38 °C/90% RH (Alves and Bordin, 1998;Marangoni et al, 2018). Water-vapor permeances are dependent on storage temperature and relative humidity.…”

Oxygen and Carbon Dioxide Permeability of Wheat Gluten Film: Effect of Relative Humidity and Temperature

“…This unexpected behavior of O 2 permeability may be partly due to the relative changes in diffusivity (D) and solubility (S) of oxygen, as they vary with temperature (Samaniego-Esguerra and Robertson, 1991):…”

Effect of Temperature and Humidity on the Water and Dioxygen Transport Properties of Polybutylene Succinate/Graphene Nanoplatelets Nanocomposite Films

“…The evolutions of as a function of water activity for the neat PBS and PBS/GnP nanocomposites are presented in Figure 8 c. For the neat PBS, considering the uncertainty, the values remained almost constant (neat PBS: 15 ± 3 kJ mol −1 ) as the water activity increased. Samaniego-Esguerra et al, obtained values on low density polyethylene (LDPE) that varied from 8 to 15 kJ mol −1 over a water activity range from 0.55 to 0.9 for a temperature range between 20 °C and 40 °C [ 42 ]. The same authors observed the opposite tendency for values of PET with a decrease from 5.6 to 3.4 kJ mol −1 for the same range of water activity and temperature.…”