- ORMOCER (inorganic-organic hybrid polymer)-zeolite Nanocomposites: Advanced Membrane Materials for Gas Separation (2010)
- This work represents a comprehensive study on the applicability of novel ORMOCER® (inorganic-organic hybrid polymer) resins for the fabrication of free-standing mixed matrix membranes. Such mixed matrix membranes comprise molecular sieve entities integrated in ORMOCER® matrix. Mixed matrix membranes have the potential to combine the processability of ORMOCER® materials with the superior transport and ion exchange properties of molecular sieves. The versatility of ORMOCER® materials is a decisive factor in achieving the desired separation properties of a novel mixed matrix membrane material. The glycerine-1,3-dimethacrylateurethanetriethoxysilane (GUS)-based ORMOCER® and dimethylsiloxane modified GUS-ORMOCER® resins were used for the fabrication of freestanding mixed matrix membranes. The zeolite Beta was used as a dispersed phase and its amount was varied between 10 to 40 wt.%. The effect of different type of zeolites was also studied using zeolite 3Å, 4Å, and 5Å. The membranes were prepared by conventional solution casting method followed by UV-curing. The ORMOCER® resins and cured membranes were analysed using FT-IR, liquid-state 29Si NMR, TG, DSC, SEM, N2 sorption and single-gas permeation measurements. The permeation performance of the membranes was examined using H2, He, CO2, O2 and N2 as a test gases at room temperature, the upstream pressure was varied between 1.3 to 2.5 atm. The effect of the amount of dimethylsiloxane moiety, zeolite content, different zeolite type and annealing temperature were systematically investigated in relation to the gas permeation performance of the membranes. The addition of dimethylsiloxane moiety in GUS-based ORMOCER® membrane appears to result in a significant increase in gas permeability, with a correspondingly large decrease in selectivity. The mixed matrix membranes show improved gas permeation performance in comparison to pure ORMOCER® membranes. This study was shown important role of zeolite particles in inorganic-organic hybrid (ORMOCER®) system. The potential usefulness of ORMOCER®-zeolite mixed matrix membranes as gas separation membranes is discussed.