1. Controlled surface morphology of polyamide membranes via the addition of co-solvent for improved permeate flux
- Author
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Takashi Kamada, Tomomi Ohara, Toshinori Tsuru, and Takuji Shintani
- Subjects
Ultrafiltration ,Ethyl acetate ,Filtration and Separation ,Isopropyl alcohol ,Biochemistry ,Interfacial polymerization ,chemistry.chemical_compound ,Membrane ,chemistry ,Polymerization ,Polymer chemistry ,Polyamide ,General Materials Science ,Physical and Theoretical Chemistry ,Diethyl ether ,Nuclear chemistry - Abstract
Polyamide membranes with a controlled surface morphology were prepared by the interfacial polymerization of 1,3-phenylenediamine (MPD) with 1,3,5-benzenetricarbonyl trichloride (TMC) on polysulfone ultrafiltration supports. In a novel polymerization method, co-solvents, which included acetone, ethyl acetate, diethyl ether, toluene, isopropyl alcohol (IPA) and N,N ′-dimethyl formamide (DMF), were added into the organic phase which made it possible to control the surface morphology and polyamide network structures. As-prepared, the membranes showed multi-layered ridge-and-valley structures, and the types of co-solvent successfully controlled permeate flux and rejection. Polyamide membranes prepared by the addition of 2 wt% ethyl acetate, showed the best performance with NaCl rejection of 99% and permeate flux of more than 1 m 3 /(m 2 d) at 1.5 MPa, which was about twice that of a membrane prepared without a co-solvent.
- Published
- 2014