Integrated manufacturing of REciclable multi-material COmposites for the TRANSport sector
Mixed substituent ether-containing polyphosphazene/poly(bis-phenoxyphosphazene) blends as membranes for CO2 separation from N2
The best CO2 capture membranes oftentimes have physical or mechanical properties that make them less than effective or impractical for use in a commercial application. In this paper we have demonstrated that by blending the CO2 selective polymer with a more physically stable polymer, much of the problems associated with physical and mechanical properties are solved while yielding excellent performance in separation of CO2 from N2..AbstractPolyphosphazenes gain much of their physical and chemical properties from the substituents attached to the phosphorus atoms in the backbone. Poly(phosphazenes) that have short?chain polyether containing substituents, such as, 2?(2?methoxyethoxy)ethanol, have high CO2 permeability and selectivity over N2 as well as resistance to degradation under humidification at 60°C. However, the principal shortcomings of this polymer are the poor mechanical and surface characteristics. Blending of an example of this polyphosphazene (MEEP?80) with poly(bis-phenoxyphosphazene) (PPOP) has yielded more durable materials that have a non?adhesive surface. In this work, the blended polymer membranes were found to have increased CO2 permeability with higher selectivity over N2. Thermal analysis and the application of transport models support a structure of the blends that is not either an intimate blend or phase separated bulk structure, but one where PPOP domains retain their crystallinity and are dispersed within an amorphous MEEP?80 phase.
» Author: Christopher J. Orme, Joshua S. McNally, John R. Klaehn, Frederick F. Stewart
» Reference: doi:10.1002/app.50207
» Publication Date: 01/11/2020
This project has received funding from the European Union's Horizon 2020 research and innovation programme under grant agreement Nº 768737
