Transport of hydrogen and carbon monoxide in highly crosslinked poly(propylene glycol) networks (original) (raw)

Probe Into the Influence of Crosslinking on CO2 Permeation of Membranes

Scientific reports, 2017

Crosslinking is an effective way to fabricate high-selective CO2 separation membranes because of its unique crosslinking framework. Thus, it is essentially significant to study the influence of crosslinking degree on the permeation selectivities of CO2. Herein, we report a successful and facile synthesis of a series of polyethylene oxide (PEO)-based diblock copolymers (BCP) incorporated with an unique UV-crosslinkable chalcone unit using Reversible Addition-Fragmentation Chain Transfer Polymerization (RAFT) process. The membranes of as-prepared BCPs show superior carbon dioxide (CO2) separation properties as compared to nitrogen (N2) after UV-crosslinking. Importantly, the influence of different proportions of crosslinked chalcone on CO2 selectivities was systematically investigated, which revealed that CO2 selectivities increased obviously with the enhancement of chalcone fractions within a certain limit. Further, the CO2 selectivities of block copolymer with the best block proport...

Gas permeation through a polymer network

Journal of Physics-condensed Matter, 2005

We study the diffusion of gas molecules through a two-dimensional network of polymers with the help of Monte Carlo simulations. The polymers are modeled as non-interacting random walks on the bonds of a two-dimensional square lattice, while the gas particles occupy the lattice cells. When a particle attempts to jump to a nearest-neighbor empty cell, it has to overcome an energy barrier which is determined by the number of polymer segments on the bond separating the two cells. We investigate the gas current JJJ as a function of the mean segment density rho\rhorho, the polymer length ell\ellell and the probability qmq^{m}qm for hopping across mmm segments. Whereas JJJ decreases monotonically with rho\rhorho for fixed ell\ellell, its behavior for fixed rho\rhorho and increasing ell\ellell depends strongly on qqq. For small, non-zero qqq, JJJ appears to increase slowly with ell\ellell. In contrast, for q=0q=0q=0, it is dominated by the underlying percolation problem and can be non-monotonic. We provide heuristic arguments to put these interesting phenomena into context.