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Guangwei He 8 th sept ,2012

Guangwei He 8 th sept ,2012. The influence of hydrophilcity of the microcapsule shell on water retention capacity. Background ： Importence of water to PEM. The linear coefficient of proton conductivity to water uptake is 0.83.

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Guangwei He 8 th sept ,2012

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  1. Guangwei He 8th sept ,2012 The influence of hydrophilcity of the microcapsule shell on water retention capacity

  2. Background ：Importence of water to PEM • The linear coefficient of proton conductivity to water uptake is 0.83. • Highly related to vehicle-mechanism proton transport and Grotthuss-menchanism proton transport.

  3. Background ：approaches devoted to enhanceing water uptake previously • Incorporation of hydrophilic filler into polymer • Hydrophilic modification

  4. History of water-retention research in our group Polymer carboxylic acid -COOH -COOH -COOH -COOH -COOH -COOH -COOH -COOH -COOH -COOH -COOH -COOH -COOH -COOH -COOH

  5. History of water-retention research in our group Polymeric Microcapsules polymer void polymer Water uptake：＞94wt%

  6. History of water-retention research in our group Imidazole Microcapsules -COOH carboxylic acid cores and phosphonic acid shells imidazole void -COOH imidazole imidazole Double-Shelled Microcapsule （in submission ） imidazole

  7. Introduction of my ongoing work • It is assumed that the degree of hydrophilicity of the microcapsule shell is essential factor affecting water-retention capacity of polymer microcapsule. -COOH -COOH -COOH -COOH -COOH -COOH -COOH -COOH -COOH -COOH -COOH -COOH • This work will contribute to understanding the relationship between hydrophilcity of the microcapsule shell and its water retention capacity . Hydrophilicity is tuned by selectively used cross-linking agent

  8. Experimental plan MPS-modified silica DVB: hydrophobic EGDMA ：hydrophilic MAA+DVB MAA+DVB+EGDMA MAA+EGDMA -COOH -COOH -COOH 1.contact angle 2.Water retention properties 3Water state -COOH -COOH -COOH -COOH -COOH -COOH -COOH -COOH -COOH HF HF HF

  9. Idea spinning in my head • Triazole microcapsule • Grafting PEG on carboxylic acid microcapsule • Different functional groups synergistically enhancing water-retention properties. • Microcapsule with inorganic-organic hybrid shell Progress in Polymer Science 37 (2012) 1265– 1291； Angew. Chem. Int. Ed.2009, 48 , 3124 –3128

  10. Supporting information robust cross-linking structures Tianyou Chen，Langmiur ，2012

  11. Thank you！

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