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Title: Adverse Effect of Polyelectrolyte Complexation on the CO2 Permeability of Polyvinylamine Copolymers

Journal Article · · ACS Applied Engineering Materials
ORCiD logo [1]; ORCiD logo [1];  [2];  [3]
  1. National Energy Technology Lab. (NETL), Pittsburgh, PA (United States); NETL Support Contractor, Pittsburgh, PA (United States)
  2. The Ohio State Univ., Columbus, OH (United States)
  3. National Energy Technology Lab. (NETL), Pittsburgh, PA (United States)

Polyvinylamine (PVAm) is one of the most studied polymers for facilitated transport membranes (FTMs) in CO2 separation applications. In this study, poly(N-vinylformamide) (PNVf) was hydrolyzed to prepare a range of PNVf-PVAm copolymer compositions and the effect of PVAm fraction on CO2 permeability and CO2/N2 selectivity these polymers examined. The most permeable film was the polymer containing 52 mol% PVAm units with a CO2 permeability of 353 Barrer and CO2/N2 selectivity of 96, when tested at 60°C with humidified 14/86 CO2/N2 mixed gas. Despite containing a higher loading of amines to act as CO2 carriers, higher PVAm contents yielded significantly lower CO2 permeability, without a loss of selectivity. This trend was not due to polymer crystallization since none of the PVAm films exhibited crystallinity in X-ray diffraction analysis. The loss of gas permeability at high PVAm content was instead due to strong polyelectrolyte interactions between polymer chains formed when PVAm reacts with CO2. Since only the PVAm units are ionized upon reaction with CO2, with the PNVf units remaining neutral, the density of these ionic effects increased as PVAm content increased, leading to increased resistance to gas permeation.

Research Organization:
National Energy Technology Laboratory (NETL), Pittsburgh, PA, Morgantown, WV, and Albany, OR (United States)
Sponsoring Organization:
USDOE Office of Fossil Energy and Carbon Management (FECM)
OSTI ID:
2432377
Journal Information:
ACS Applied Engineering Materials, Journal Name: ACS Applied Engineering Materials Journal Issue: 5 Vol. 2; ISSN 2771-9545
Publisher:
ACS PublicationsCopyright Statement
Country of Publication:
United States
Language:
English

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