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- W1997911452 abstract "Block copolymers composed of polyamide as the outer segment and polyoxyethylene as an inner segment were prepared by the anionic ring-opening polymerization of a bicyclic oxalactam, 8-oxa-6-azabicyclo[3.2.1]octan-7-one, activated with polyoxyethylene of different molecular weight having isocyanate groups at both chain ends. They were cast to the hydrophilic membranes, of which degree of hydration and hydraulic permeability (Kw) depended upon the length of the polyoxyethylene segment in the copolymers. The value of Kw for the membrane preheated in water at 50°C was lower than that for the original membrane in the temperature range from 25 to 45°C. However the permeability was completely restored by aging in water at room temperature for a week. From an investigation on the behavior of water molecules in the membrane in terms of the thermal analyses, such a peculiar hysteresis can be presumed to come from the quick response of some structural transformation on heating and its slow relaxation on cooling." @default.
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- W1997911452 date "1987-02-01" @default.
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- W1997911452 title "Hydraulic Permeability-Temperature Hysteresis for the Hydrophilic Membrane Prepared from the Block Copolymer Consisting of Polyamide and Polyoxyethylene Segments" @default.
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- W1997911452 doi "https://doi.org/10.1295/polymj.19.249" @default.
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