Surface Modification of PTFE Micro-porous Membrane by Al(OH)3 Gel
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Abstract:
Chemical adsorption was used to improve the hydrophilic of PTFE micro-porous membrane in this paper. Al(OH)3 gel was produced by AlCl3 solution to improve the surface properties of PTFE micro-porous membrane. The effects of impregnation temperature, impregnation time, amount of adsorbent, amount of NH3?nH2O and polymerization degree of dispersing agents on the adsorption of PTFE micro-porous membrane were investigated. Ultrasonic oscillation was used to measure the stability of PTFE adsorption. The properties of modified membrane were investigated by means of contact angel, FTIR and SEM. The results showed that the adsorptive value of PTFE micro-porous membrane achieved a maximum (211.53 mg/g) when impregnation temperature and time was 20 ℃ and 20 h respectively, AlCl3(1 mol/L) solution was 45 ml and NH3?nH2O(wt%=25%) was 86 ml. The adsorption reached equilibrium after the ultrasonic oscillating was treated for 1 h at pH 7 and 20 ℃, and contact angel of PTFE membrane decreased from 137.42° to 105.29.
