Synthesis of Aminated Poly(ether imide) for the Preparation of Bi-polar Membranes and Their Application to Hypochlorite Production through the Surface Direct Fluorination

Abstract

초록: 폴리페닐렌옥사이드(PPO)와 폴리에테르이미드(PEI)에 대해 각각 설폰화(SPPO) 및 아민화(APEI)반응이Abstract: Poly(phenylene oxide) (PPO) and polyether imide (PEI) were sulfonated and aminated to create sulfonated poly(phenylene oxide) (SPPO) and aminated polyether imide (APEI), respectively. Characterization of the SPPO and APEI were performed via measurements of FTIR, thermogravimetry (TGA), swelling degree, ion exchange capacity (IEC), and ion conductivity. Next, the surfaces of these membranes were modified by surface fluorination at room temperature. The surface fluorinated SPPO and APEI membranes underwent characterization again for the mentioned measurements to determine any differences. The 3 types of bi-polar membranes were prepared by varying the IEC of the APEI at a fixed SPPO IEC value, which were applied to the low and high NaCl concentration of feed solution at the different current density, respectively. The hypochlorite concentration derived from the surface fluorinated membranes was dependent on the IEC of the APEI and ranged from 491 to 692 ppm at 80 mA/m 2 . At low current density of 5 mA/m 2 , the hypochlorite concentrations ranged from 18 to 28 ppm for the 4 hrs surface fluorinated membranes and their durability increased greatly.

Study on Acid/Base Formation by Using Sulfonated Polyether Ether Ketone/Aminated Polysulfone Bipolar Membranes in Water Splitting Electrodialysis

“…To characterize the electric and physical properties of the synthesized SPEEK and APSf, the swelling degree, ion-exchange capacity, and ion conductivity were measured. Measurement procedures followed previously adopted standards. , …”

Effect of Direct Fluorination on the Transport Properties and Swelling of Polymeric Materials: A Review

“…Pioneer works by Nazarov et al [ 39 ] and Koros et al [ 40 ] showed a significant impact of the fluorinated layer on liquid permeation through gas-phase fluorinated polyethylene. Later, the direct fluorination technique was applied for treatment of membranes prepared from different classes of polymers in glassy and rubbery states (polyolefins [ 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 , 52 , 53 , 54 , 55 , 56 ], polyacetylenes [ 57 , 58 , 59 ], polyethers [ 60 , 61 , 62 , 63 , 64 , 65 ], polyesters [ 66 ], urethane-based polymers [ 67 ], polyetherketones [ 68 ], polysulfones [ 69 , 70 , 71 ], polyimides [ 72 , 73 , 74 , 75 ], etc.).…”