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Influence of Microcapsule Shell Hydrophilicity on Water Retention Capacity

This study investigates how the hydrophilicity of microcapsule shells affects their water retention capacity, which is crucial for proton exchange membranes (PEM). A linear correlation between proton conductivity and water uptake is established, emphasizing the role of hydrophilic modifiers and polymers like carboxylic acid in enhancing water retention. Historical research within our group and ongoing work on double-shelled microcapsules with imidazole cores are discussed. The focus is on optimizing microcapsule shells through selective cross-linking agents to improve hydrophilicity.

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Influence of Microcapsule Shell Hydrophilicity on Water Retention Capacity

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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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