Stability of Humidity Response of Octavinyl POSS-acrylate Hybrid Copolymer Humidity-sensitive Material
The organic-inorganic hybrid acrylate copolymer Cop(MBHP0.23)was synthesized on the basis of octavinyl POSS(OV-POSS),a compound with a caged polyhedral structure consisting of the elements silicon,oxygen,and carbon.The molecular structure of the material was tested using infrared spectroscopy,which proved the successful synthesis of copolymer Cop(MBHP0.23).Scanning electron microscope and atomic force microscope were used to observe the surface morphology characteristics and roughness of the material film,which proved that the incorporation of OV-POSS improved the humidity-sensitive response performance of the film.A thermogravimetric analyzer was used to test the thermal stability of the material,and the results showed that the material has excellent thermal stability.The resistance values of the fork finger electrodes were tested using an LCR digital bridge,and the results showed that the moisture-sensitive response curves of the materials had a high linearity(r=0.996),a short response/recovery time(14.0 s/68.5 s),a small wet hysteresis(0.88%RH),and a low temperature change coefficient(0.035%RH/℃).The humidity response mechanism of the materials was investigated using an electrochemical workstation to test the dielectric properties of the films.It is dominated by the intrinsic conductivity of the moisture-sensitive material in the low and medium humidity ranges,and by the ionic conductivity in the high humidity range.
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