Premium
Polyethylenimine–polyepichlorohydrin interpolymer for chelating ion‐exchange membrane
Author(s) -
Saegusa Takeo,
Yamada Akira,
Kobayashi Shiro,
Yamashita Shinzo
Publication year - 1979
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1979.070230812
Subject(s) - polyethylenimine , membrane , selectivity , polymer chemistry , chemistry , dimethylformamide , adsorption , polymer , ion exchange , chemical engineering , materials science , ion , solvent , organic chemistry , transfection , biochemistry , engineering , gene , catalysis
Polyethylenimine membranes consisting of linear polyethylenimine (PEI) and polyepichlorohydrin (PECH) were prepared by casting and heating an N , N ‐dimethylformamide solution of the two polymers under nitrogen at 100°C for 60 min. The membrane was also prepared by a heat‐press method in a conventional manner. The cast membrane obtained was transparent. The membrane has a crosslinked structure due to the reaction between the secondary amino groups in PEI and the chloromethyl groups in PECH. Although a larger feed ratio of PEI/PECH gave membranes with a larger adsorption capacity for Cu 2+ ions, the optimum ratio was 40/100 with respect to mechanical properties. A belt conveyor system using the PEI membrane was able to transport Cu 2+ ions from one bath to another. In a diffusion dialysis against 1 N HCl, the PEI membrane crosslinked rather tightly showed a specific ion‐selective transfer character. For example, in Cu 2+ –Ca 2+ system the permeability ratio P cu / P ca was about 3.8. The selectivity arises from the difference between affinities (extractabilities) of PEI toward metal ions. The selectivity was changed depending on the pH value.