Journal
MACROMOLECULAR RESEARCH
Volume 22, Issue 9, Pages 963-970Publisher
POLYMER SOC KOREA
DOI: 10.1007/s13233-014-2142-6
Keywords
draw solution; LCST polymers; ionic polymers; forward osmosis
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Funding
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education, Science and Technology [2013-008607]
- National Research Foundation of Korea - Korean Government (MEST) [NRF-2010-M1A2A2-0029081]
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Thermo-responsive copolymers containing ionic groups (P(MTxEOy), where x and y are the feed molar percent of [2-(methacryloyloxy)ethyl]trimethylammonium chloride (MTAC) and 2-(2-methoxyethoxy)ethyl methacrylate (MEO), respectively) were synthesized via free radical polymerization using MTAC and MEO as monomers, in order to use the copolymers as a draw solute in a forward osmosis (FO) system. The osmotic pressure and lower critical solution temperature (LCST) could be controlled by changing the composition of the copolymers. For example, P(MT25EO75) shows a relatively high osmotic pressure of 0.909 Osmol/kg at 0.2 g/mL, and P(MT5EO95) shows a LCST close to room temperature at 32 A degrees C. When P(MT20EO80) was used as a draw solute in the FO system, a reasonable water permeation flux value of 5.45 Lm(-2)h(-1) at 0.1 g/mL was observed and the draw solute (P(MT20EO80)) could be recovered with a very large draw solute recovery value of 99.80% from the draw solutions by heating to 70 A degrees C, above the LCST, followed by a microfiltration process. Therefore, it is expected that such copolymer system could be a prospective candidate as a draw solute in the FO system.
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