Gas transport and free volume study in polyethylene based epoxy membranes

11th International Workshop on Positron and Positronium Chemistry

物理学;化学

Patil, Pushkar N.^1,2 ; Checchetto, R.^1 ; Ferragut, R.^3 ; Aghion, S.^3 ; Miotello, A.^1 ; Brusa, R.S.^1

Department of Physics, University of Trento, via Sommarive 14, Povo

I-38123, Italy^1

Institute for Polymers, Composites and Biomaterials, National Research Council, Piazzale Tecchio 80, Napoli

I-80125, Italy^2

Department of Physics, L-NESS, Politecnico di Milano, via Anzani 42, Como

22100, Italy^3

关键词: Cross-linking density;    Diffusivity changes;    Free volume properties;    Gas permeation measurements;    Graphene nanoplatelets;    Inverse correlation;    Positron annihilation spectroscopy (PAS);    Solvent casting method;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/618/1/012036/pdf
DOI  :  10.1088/1742-6596/618/1/012036

来源: IOP

【 摘 要 】

The mechanism of gas diffusivity in amine modified epoxy membranes is studied in the frame of free volume properties. Epoxy membranes with two different crosslinking densities and composite with Graphene nanoplatelets were prepared by solvent casting method. The free volume parameters measured by Positron Annihilation Spectroscopy (PAS) show inverse correlation with crosslinking density of the samples. The gas permeability and diffusivity for CO2have been studied by gas permeation measurements. The study reveals that the gas permeability and diffusivity change significantly as a function of crosslinking density, free volumes and structural relaxations of the molecular chains.