Burger
Journalpaper

Stability of blended polymeric materials for CO2 separation

Abstract

Reduction of CO2 emission caused by fossil fuel power plants is widely appreciated task. The most suitable materials for off-gas membrane separation process are poly(ethylene glycol) containing polymers. Pebax® 1657 blended with low molecular weight poly(ethylene glycol)s is a promising material for the selective layer of thin film composite gas separation membranes. Stability of blend Pebax® 1657 thick membranes was evaluated at temperatures up to 90 °C, exceeding those at a stack of power plant. The membranes were tested for gas transport properties by thermoanalytical methods. It was found that a threshold of molecular weight exists between 350 and 500 g/mol, at which leaching out of the low molecular weight poly(ethylene glycol) compound from the polymer matrix becomes minimal. Poly(ethylene glycol) with methyl end groups having a molecular weight of 500 g/mol provides a blend material with a CO2 permeability coefficient higher than in case of Polyactive™. PEBAX®/DM500 blend can be a cheaper alternative to tailor made Polyactive™ in large scale production of CO2 selective thin film composite membrane.
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