PowerPoint

Guangwei He 8th 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.Highly related to vehicle-mechanism proton transport and Grotthuss-menchanism proton transport.

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

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

History of water-retention research in our group
Polymeric Microcapsules
Water uptake94wt%

History of water-retention research in our group
Imidazole Microcapsules
carboxylic acid cores and phosphonic acid shells
Double-Shelled Microcapsule in submission

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.
This work will contribute to understanding the relationship between hydrophilcity of the microcapsule shell and its water retention capacity .

Experimental plan
DVB: hydrophobicEGDMA hydrophilic
1.contact angle2.Water retention properties3Water state

Idea spinning in my head
Triazole microcapsuleGrafting PEG on carboxylic acid microcapsuleDifferent 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

Tianyou ChenLangmiur 2012
Supporting information
robust cross-linking structures

Water retention is a vital property for diverse applicationsWithout a doubt, high water retention is urgently required for PEMs to achieve high performance and long lifetimesBound waterwater that is bound to the polymer chain via interactions with polar and ionic groups and shows an restricted mobility within the membrane free water water that is not intimately bound to the polymer chain and behaves like bulk wateri.e.a sharp melting point at around 0
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1.150nmPCAs5-30%SPEEK/PCAs76.8272.1934.31%50.1%20.6328.45%13.6821.64%39.8743.20%15%50% JMS2010

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Independent Control of Water Retention and Acid-Base Pairing through Double-Shelled Microcapsules to Confer Membranes Enhanced Proton Conduction under Low Humidity

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1Among several azole molecules, triazole was better than imidazole in both proton conductivity and electrochemical stability.PPS2011click reaction2PEGPEGrecent results demonstrated that a blend film containing PEG and poly(3-hydroxybutyrate) (PHB) in a 0.05:0.95 ratio displayed a 200 % increase in water perme-ability compared to pure PHB films. 3,,2--2-; 4PEM

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8111nm and20 4 nm robust cross-linking structures
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