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Core-Shell Composite Synthesized through In Situ Polymerization in Emulsion with High Electrical Conductivity Sensitive to Humidity

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WILEY-V C H VERLAG GMBH
DOI: 10.1002/ppsc.201600423

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  1. Science Development Special Fund Program of Jiangsu Province, the technic innovation platform of advanced water-bone pressure sensitive adhesive

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A core-shell composite has been synthesized through in situ polymerization in emulsion with an average of 205 nm of diameter. Each composite consists of a graphene oxide (GO) core and a poly(methyl methacrylate/butyl acrylate) shell. The latex is homogeneous without any aggregation after stability testing in normal temperature for 100 d and can be applied as an ideal conductive adhesive whose glass transition temperature (T-g) is under -30 degrees C and lucid conductive film whose T-g is above 17 degrees C. There exists half core-shell structure in the composite with part of GO exposed which contributes to the electrical conductivity of film formed by composite. The electrical conductivity of the composite is sensitive to humidity, increasing from 0.233 to 0.357 S m(-1), while the related humidity ranges from 0% to 60%. The flexible aliphatic shell established by polyacrylate chains with nanolevel of interspaces makes it easy for hydrone to move in and interact with the oxygen groups on the chains, and then the interaction enhances the difficulty for hydrone to move out, on account of which film formed by core-shell composite can hold hydrone and exhibit advanced electrical conductivity in high humidity atmosphere.

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