Preparation and Selective Oxygen Permeation Characteristics of Polydimethylsiloxane-Polyurethane IPNss Membrane

Polydimethylsiloxane-Polyurethand Interpenetrating Polymer Networks의 제조와 산소투과 특성에 관한 연구

Interpenetrating polymer networks(IPN) based on polyurethane and polydimethylsiloxane have been prepared by simultaneous polymerization method, and the permeability of N2 and O2 and pemselectivity of oxygen to nitrogen were evaluated. The polyurethane networks were prepared by reacting NCO group terminated polyurethane prepolymer composed of 2 eq.of TDI and 1 eq.of polyol with the mixture of 1,4-butadiene and trimethylor propane as the crosslinking agent. Polydimethylsiloxane networks were prepared by polymerizing the mixture of octamethylcyclotetrasiloxane, tetraammonium hydroxide and tetraethoxysilane. The prepared IPN was confirmed by the measurement of Young's modulus and tanδ using dynamic mechanical analyzer spectrometer, The permeabilities of oxygen and nitrogen were better in the membrane increasing the contents of polydimethylsiloxane than having lower contents of polydimethylsiloxane in the composition. But the IPN with lower contents of polydimethylsiloxane has the higher selectivity.