Method for preparing porous polyaniline/polyurethane composite material through electrochemical deposition
A composite material and electrochemical technology, which is applied in the field of preparation of porous polyaniline/polyurethane composite materials by electrochemical deposition, can solve the problems of difficult control of operating conditions and reduce the purity of polyaniline composite membranes, and achieve low price, light weight, and high-quality materials. evenly distributed effect
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Embodiment 1
[0022] Select polyurethane foam substrate with specifications of 1.5cm×1.5cm×0.3cm, and immerse it in absolute ethanol, 1-3 mol / L sodium hydroxide (or potassium hydroxide) solution, 1-3 mol / L hydrochloric acid ( or sulfuric acid) solution and deionized water, stirred and washed for 5 to 20 minutes to remove oil, and dried in an oven for later use.
[0023] Weigh 10g of stannous chloride (0.053mol) and dissolve it in 30mL of 12mol / L concentrated hydrochloric acid aqueous solution, then dilute to 150mL with distilled water, then add 1.5g of tin particles (0.013mol), stir well, and configure it as a sensitization solution .
[0024] Immerse the degreased polyurethane foam in the sensitizing solution for 5 minutes, take it out, dry it, put the liquid back into the original sensitization tank, and rinse the dried polyurethane foam with running water repeatedly. During the sensitization process, the foam matrix should be turned frequently to ensure the uniformity of the sensitized ...
Embodiment 2
[0027] Dissolve 4.56mL of aniline monomer 0.5mol / L into 100mL of 2mol / L HNO 3 In, first appear white precipitation, dissolve after stirring, make electrolytic solution with this solution, then use the conductive polyurethane foam of carrying silver layer obtained in embodiment 1 to make anode, graphite sheet is made cathode, and experiment process is carried out in electrolyzer. At room temperature (25°C), keep the voltage at 15V for 20min, soak the dark green polyaniline / polyurethane composite material obtained by electrochemical deposition in absolute ethanol for 1min, and then dry it in an oven at 80°C. The SEM photo of the obtained doped state polyaniline / polyurethane composite material is as follows figure 1 with figure 2 As shown, it can be seen that the material has a three-dimensional network structure with uniform pore distribution, good permeability, a porosity of 85-95%, and an electrical conductivity of 2.0-6.0 S / cm.
Embodiment 3
[0029] Dissolve 4.56mL of aniline monomer 0.5mol / L into 100mL of 2mol / L H 2 SO 4 In, first appear white precipitation, dissolve after stirring, make electrolytic solution with this solution, then use the conductive polyurethane foam of carrying silver layer obtained in embodiment 1 to make anode, graphite sheet is made cathode, and experiment process is carried out in electrolyzer. At room temperature (25°C), keep the voltage at 15V for 40min, soak the dark green polyaniline / polyurethane composite material obtained by electrochemical deposition in absolute ethanol for 1min, and then dry it in an oven at 80°C.
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