Size-controlled nanoparticles of poly(acrylonitrile-<Emphasis Type="Italic">co</Emphasis>-methyl methacrylate) for moisture-absorbing heat release applications |
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Authors: | Young Ho Kim Won Seon Lee Jae Whan Cho |
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Institution: | (1) School of Chemistry and Environment, South China Normal University, Guangzhou, 510006, China;(2) College of Materials Science and Engineering, South China University of Technology, Guangzhou, 510641, China;(3) Key Lab of Electrochemical Technology on Energy Storage and Power Generation in Guangdong Universities, Guangzhou, 510006, China; |
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Abstract: | Hydrophilic and water-insoluble poly(acrylonitrile-co-methyl methacrylate) P(AN-co-MMA)] nanoparticles were prepared to investigate their moisture-absorbing heat release effect. The nanoparticle size was
controlled by varying the composition of AN and MMA. First, P(AN-co-MMA) nanoparticles were synthesized by emulsion polymerization, followed by cross-linking with hydrazine for water insolubility.
Secondly, the hydrazine-cross-linked P(AN-co-MMA) nanoparticles were hydrolyzed in an aqueous NaOH solution to form hydrophilic groups. The hydrolyzed and cross-linked
P(AN-co-MMA) hc-P(AN-co-MMA)] nanoparticles had a more uniform and smaller particle size with increasing MMA content compared to the PAN nanoparticles,
this is due to decreasing polar nitrile groups in the P(AN-co-MMA) with MMA content. A nanoparticle size less than 45 nm was obtained for P(AN-co-MMA) with a 20 mol% MMA content. The hc-P(AN-co-MMA) nanoparticles showed a temperature rise maximum of up to 12.9 °C in the moisture-absorbing heat release test. In addition,
when the nanoparticles with 20 mol % MMA content were coated on cotton fabrics, the temperature of the fabrics increased by
up to 7.8 °C at 90 % relative humidity. This demonstrates that the nanoparticles can be applied as a potential moisture-absorbing
heat release material. |
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