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Mixed substituent ether‐containing polyphosphazene/poly(bis‐phenoxyphosphazene) blends as membranes for CO 2 separation from N 2
Author(s) -
Orme Christopher J.,
McNally Joshua S.,
Klaehn John R.,
Stewart Frederick F.
Publication year - 2021
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.50207
Subject(s) - polyphosphazene , crystallinity , membrane , substituent , polymer , ether , selectivity , materials science , polymer chemistry , chemical engineering , amorphous solid , phosphazene , chemistry , organic chemistry , composite material , catalysis , engineering , biochemistry
Polyphosphazenes 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 CO 2 permeability and selectivity over N 2 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 CO 2 permeability with higher selectivity over N 2 . 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.