Clustering of solvents in membranes and its influence on membrane transport properties

Fourier transform infrared spectroscopy studies of water-polymer interactions in chemically amplified photoresists

“…3,11,13,16,20 The intensity of all four sub-bands, and therefore the amount of each type of water, increases with local humidity. However, the fraction of each of the four sub-bands changes with humidity in a different way, as illustrated in Figure 4.…”

“…3,5,[11][12][13][14][15][16] The vibrational spectrum can be measured in situ at a variety of humidities and provides details about the water-polymer interactions and hydrogen bonding. In this investigation, the molecular information obtained contributes to the understanding of transport through the polymer, which ultimately helps explain the deprotection reaction kinetics.…”

Permeation of water through polar and nonpolar polymers and copolymers: Determination of the concentration-dependent diffusion coefficient

“…Although a decrease in the diffusivity of the water molecules is normally expected as the permeant entities become bigger with the permeant molecule clustering, 15,17,19,20 the effect of per- meant clustering on the diffusion law is not known. The negative influence of water concentration in a hydrophobic polymer on the water diffusion coefficient is correctly modeled by such a simple law for the dependence of the diffusivity on the local water concentration in the polyolefins.…”

The influence of polarity on flux and rejection behaviour in solvent resistant nanofiltration—Experimental observations

“…Although the literature is by no means extensive, a number of researchers have investigated the nanofiltration of organic feeds containing alcohol. The majority have determined flux and/or rejection performance at the laboratory scale with relatively simple deadend permeation or stirred cell apparati in order to establish fundamental data, membrane stability and/or an insight into transport mechanisms [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]. Much of the work has focussed on the behaviour of pure components and whilst some workers have identified membrane swelling as an important Recent work by the authors in SRNF examined the flux behaviour of low polarity alkyl and aromatic solvents with radiation crosslinked polydimethylsiloxane (PDMS) membranes.…”