In situ monitoring the change of mechanical response induced by the diffusion of saline water in glassy cellulose acetate

摘要: Abstract Dynamic mechanical analysis (DMA) in submersion mode has been used as an situ and new technique to study the diffusion behavior of water different salt solutions that are usually draw forward osmosis (FO) process, glassy cellulose acetate (CA). The dramatic decay elastic modulus ( E′ ) a response upon uptake against time at constant temperature (27 °C) frequency (1 Hz) employed calculate coefficient CA near its glass transition T g based on diffusion-controlled stress-relaxation theory. Fourier transform infrared-attenuated total reflectance (FTIR-ATR) spectroscopy conventional method evaluate coefficients simple Fickian model. Diffusion have obtained from both methods show appropriate order though no correlation found between two methods. From results it may be concluded DMA measurements provide robust useful not only elucidate least qualitatively type sorption penetrant polymer solid but also if combined properly with adequate