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Deposition in situ polymerization of polyaniline / polyimide / polyaniline composite film

. Table 2 An APS molar ratio with the obtained composite membrane conductivity 2.3.3 hydrochloric acid medium (HC1) concentration on conductivity of composite films with different concentration of hydrochloric acid in Table 3 are obtained under the conditions of membrane conductance rate. The results showed that: composite membrane conductivity changes little with increasing concentration of hydrochloric acid. Remove the higher concentration of hydrochloric acid (4mol / L) under the conditions of relatively low conductivity of composite membrane,[link widoczny dla zalogowanych], the remaining concentration of the conductivity of composite films did not show much difference, both in the 5S/cm about it with hydrochloric acid as a doping related to the relative excess. Hydrochloric acid at the same time during the reaction as a proton acid and the resulting eigenstates occur doping PANI,[link widoczny dla zalogowanych], doped in PANI chain nitrogen atom of quinone. Presented by JING Xia-bin style four-quinone variable structure model projections of polyaniline, polyaniline structure benzoquinone unit ratio of about 3:1,[link widoczny dla zalogowanych], which can be formed per 1mol An 4tool the quinone structure, and each of the quinone 1mol structure will consume 2tool hydrochloric acid. An experiment using a concentration of 0.2mol / I,[link widoczny dla zalogowanych], which can be calculated assuming full conversion of the An, fully doped PANI eigenstates of the concentration of hydrochloric acid needed: 0.2mol / L �� 1 / 4 �� 2 = 0. 1moL / L. Can be seen in the hydrochloric acid concentration of 0.25 ~ 4mol / L under the conditions of reaction sufficient to achieve complete doping PANI, so the concentration of the composite membrane conductivity did not show much difference. General morphology, hydrochloric acid concentration of 0.5 ~ 1mol / L morphology of the composite film is better, higher conductivity, experimental and more in 0.5mol / L hydrochloric acid under the conditions of reaction. Table 3 composite films with different electrical conductivity of hydrochloric acid concentration of 3 Conclusion PI membrane matrix deposition by in situ dispersion polymerization method, polymerization of PVP stabilizer adding an appropriate amount of space and control the media and the oxidant APS acid (HC1) concentration can be obtained PANI / PI / PANI layer composite film, composite membrane surface appearance of excellent quality PANI layer conductivity reached 10. S / cm. PVP stabilizer which space is 4% mass fraction of oxidant An APS and the molar ratio of 2:4, the medium concentration of hydrochloric acid 0.5mol / L obtained when the composite film, good appearance, high conductivity .

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