چكيده به لاتين
Poly(ethylene oxide) (PEO) is known to possess a high affinity towards CO2 and consists of polar ether groups, which could produce quadropolar interactions with CO2. This type of membrane is used for CO2 removal, it is referred to as a CO2-selective (for H2 and CO2 separation) membrane. Whereas due to the crystalline phase in this kind of membrane body, the permeation is decreased. To decrease the polymer crystalline phase and increasing the permeation, the researchers have investigated two methods, coplymerization and blending. The crosslinking PEO membrane is a new method to prepare the membranes, which they don’t have any crystalline phase. Poly(ethylene glycol) di acrylate (PEGDA), with 700 g/mol, is selected. In this research, for improving the operation of the neat membrane, preparing the nanocomposite membrane of PEGDA with zingoxide (ZNO) nanopatticles by UV polymerization is used. The reasonable distribution of nanoparticles was defined by SEM-EDX analysis. Moreover with DSC analysis, it was recognized that with increasing the rate of nanoparticles, the glass transition temperature of membrane is decreased. With comparing the obtained density from the experimental data and the buoyancy method, and no deviation between this two method, it showed that there isn’t any hole around the nanoparticles. The operation of the prepared membranes was defined with constant volume method. The results has showed by preparing the membranes with zingoxide (4.5 %wt.), the permeation of CO2 and the selectivity of CO2/H2 are increased 60% and 32%, respectively. By the way, at 35 ͦ C, absorbtion isotherms for all the membranes and ZNO powder, were obtained. By comparing the permeability and solubility of the nanocomposite and neat membranes, it is clear that both the permeability and selectivity are resulted the permeation increasing of CO2 and H2 gases.
