بررسي خواص جداسازي گاز توسط غشاي آلياژ پلي يورتان/ پلي ﴿اتربلوك آميد﴾ و اثر نانو ذرات سيليكا بر آن

چكيده انگليسي :

Investigation of Gas Separation Properties of Polyurethane Poly ether block amid PU PEBA Polymeric Blend Membrane and Effect of Silica Nanoparticles on it Vahid Mozafari v mozafari@ce iut ac ir 2013 23 01 Department of Chemical Engineering Isfahan University of Technology Isfahan Iran Degree M Sc Language Farsi Supervisor Morteza Sadeghi m sadeghi@cc iut ac ir Abstract This research involves the investigation of the preparation and characterization of polyurethane PU polyurethane poly ether block amid PU PEBA blend membranes and also polyurethane poly ether block amid silica nanocomposite membranes for gas separation polyurethane was synthesized by two step polymerization from Ingredients of isophoronediisocyanate IPDI polytetramethylene glycol PTMG butanediamine BDA and butanediol BDO in mole ratios of A series of poly ether block amid PEBA MV and MH have been chosen to prepare PU PEBA blend membranes The effects of blend composition and weight percent of silica nanoparticles on the permeability of N O CO and CH were investigated All membranes were prepared by thermal phase inversion method Physical properties of synthesized polyurethane and prepared blends were investigated by FT IR XRD and SEM Fourier transform infrared FTIR spectroscopy was used to verify the chemical structure of the resulting polymer and blend membranes Results of FT IR indicated that with increase the amount of PEBA in blend membranes phase separation of hard and soft segments decreased it is due to the more population of OH groups of poly ether block amid and N H groups in hard segments of polyurethane XRD results showed that with increase the amount of PEBA in blends intensity of picks increase that it s a usual phenomenon The SEM micrographs of prepared samples shown that PU PEBA blend membranes were compatible immiscible systems that miscibility of blends increase with increase by wt of PEBA The results of gas permeation experiments represented that by increasing the amount of PEBA in PU PEBA blend membranes permeability of the all gases decreased and selectivity increased The results of gas permeation experiments represented that by increasing PEBA in PU PEBA blend membranes permeability of the pure gases was decreased while selectivity was increased The gas separation performance of the prepared membranes has been comprised to Robeson upper bound The prepared blend membranes have good performance in separation of CO To investigate the effect of silica nanoparticles on permeability properties of blend membranes Nanoparticles of silica made by method of sol gel Nanocomposite membranes polyurethane poly ether block amid silica containing over of polyurethane poly ether block amid were prepared and evaluated The prepared polyurethane poly ether block amid silica membranes were characterized using FTIR XRD and SEM The obtained SEM micrographs and FT IR spectra s confirmed that the silica nanoparticles distributed in polymer matrix homogenously From XRD patterns of nanocompoites membranes excluded that crystallinity of prepared samples decreased with increase the weight percent of nanoparticles on them Gas permeation properties of nanocomposite membranes with silica content of and wt was studied for pure gases at bar pressure and at C The obtained results indicated the decrease in permeability of all gases but the increment in CO N CO CH and O N selectivities by increasing the content of silica nanoparticles in nanocomposite membranes Keywords Membrane Gas separation Polyurethane Poly ether block amid Blend Silica Nanocomposite

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بررسي خواص جداسازي گاز توسط غشاي آلياژ پلي يورتان/ پلي ﴿اتربلوك آميد﴾ و اثر نانو ذرات سيليكا بر آن

غشاي نانو كامپوزيت , نانو سيليكا