3 research outputs found
Molecular Mobility and Gas Transport Properties of Mixed Matrix Membranes Based on PIM‑1 and a Phosphinine Containing Covalent Organic Framework
Polymers with intrinsic microporosity (PIMs) are gaining attention as gas separation membranes. Nevertheless, they face limitations due to their pronounced physical aging. In this study, a covalent organic framework containing λ5-phosphinine moieties, CPSF-EtO, was incorporated as a nanofiller (concentration range 0–10 wt %) into a PIM-1 matrix forming dense films with a thickness of ca. 100 μm. The aim of the investigation was to investigate possible enhancements of gas transport properties and mitigating effects on physical aging. The incorporation of the nanofiller occurred on an nanoaggregate level with domains up to 100 nm, as observed by T-SEM and confirmed by X-ray scattering. Moreover, the X-ray data show that the structure of the microporous network of the PIM-1 matrix is changed by the nanofiller. As molecular mobility is fundamental for gas transport as well as for physical aging, the study includes dielectric investigations of pure PIM-1 and PIM-1/CPSF-EtO mixed matrix membranes to establish a correlation between the molecular mobility and the gas transport properties. Using the time-lag method, the gas permeability and the permselectivity were determined for N2, O2, CH4, and CO2 for samples with variation in filler content. A significant increase in the permeability of CH4 and CO2 (50% increase compared to pure PIM-1) was observed for a concentration of 5 wt % of the nanofiller. Furthermore, the most pronounced change in the permselectivity was found for the gas pair CO2/N2 at a filler concentration of 7 wt %.Bundesanstalt f?r Materialforschung und -Pr?fung
10.13039/100009553Engineering and Physical Sciences Research Council
10.13039/501100000266Peer Reviewe
Molecular Mobility and Gas Transport Properties of Mixed Matrix Membranes Based on PIM-1 and a Phosphinine Containing Covalent Organic Framework
Polymers with intrinsic microporosity (PIMs) are gaining attention as gas separation membranes. Nevertheless, they face limitations due to their pronounced physical aging. In this study, a covalent organic framework containing λ5-phosphinine moieties, CPSF-EtO, was incorporated as a nanofiller (concentration range 0–10 wt %) into a PIM-1 matrix forming dense films with a thickness of ca. 100 μm. The aim of the investigation was to investigate possible enhancements of gas transport properties and mitigating effects on physical aging. The incorporation of the nanofiller occurred on an nanoaggregate level with domains up to 100 nm, as observed by T-SEM and confirmed by X-ray scattering. Moreover, the X-ray data show that the structure of the microporous network of the PIM-1 matrix is changed by the nanofiller. As molecular mobility is fundamental for gas transport as well as for physical aging, the study includes dielectric investigations of pure PIM-1 and PIM-1/CPSF-EtO mixed matrix membranes to establish a correlation between the molecular mobility and the gas transport properties. Using the time-lag method, the gas permeability and the permselectivity were determined for N2, O2, CH4, and CO2 for samples with variation in filler content. A significant increase in the permeability of CH4 and CO2 (50% increase compared to pure PIM-1) was observed for a concentration of 5 wt % of the nanofiller. Furthermore, the most pronounced change in the permselectivity was found for the gas pair CO2/N2 at a filler concentration of 7 wt %
Molecular Mobility and Gas Transport Properties of Mixed Matrix Membranes Based on PIM‑1 and a Phosphinine Containing Covalent Organic Framework
Polymers with intrinsic
microporosity (PIMs) are gaining attention
as gas separation membranes. Nevertheless, they face limitations due
to their pronounced physical aging. In this study, a covalent organic
framework containing λ5-phosphinine moieties, CPSF-EtO,
was incorporated as a nanofiller (concentration range 0–10
wt %) into a PIM-1 matrix forming dense films with a thickness of
ca. 100 μm. The aim of the investigation was to investigate
possible enhancements of gas transport properties and mitigating effects
on physical aging. The incorporation of the nanofiller occurred on
an nanoaggregate level with domains up to 100 nm, as observed by T-SEM
and confirmed by X-ray scattering. Moreover, the X-ray data show that
the structure of the microporous network of the PIM-1 matrix is changed
by the nanofiller. As molecular mobility is fundamental for gas transport
as well as for physical aging, the study includes dielectric investigations
of pure PIM-1 and PIM-1/CPSF-EtO mixed matrix membranes to establish
a correlation between the molecular mobility and the gas transport
properties. Using the time-lag method, the gas permeability and the
permselectivity were determined for N2, O2,
CH4, and CO2 for samples with variation in filler
content. A significant increase in the permeability of CH4 and CO2 (50% increase compared to pure PIM-1) was observed
for a concentration of 5 wt % of the nanofiller. Furthermore, the
most pronounced change in the permselectivity was found for the gas
pair CO2/N2 at a filler concentration of 7 wt
%