Study On Force Output Performance Of Electric Actuator Based On Chitosan Biogel

The electroactive polymer prepared based on biogel has the advantages of low cost,simple preparation,small driving voltage,light weight,low energy consumption,more flexible movement,large deflection displacement,and the same driveability as biological muscle,which has become the current hot topic.In this thesis,the biogel electric actuator based on carboxymethyl chitosan as the base material is taken as the research object,and a sandwich structure is prepared by heating and freezing methods,and tannic acid and carboxymethyl cellulose is used to enhance the comprehensive performance of chitosan-based biogel electric actuators,the effects of tannic acid and carboxymethyl cellulose crosslinking on force output and electrochemical performance of biogel electroactuators were studied.The output force and deflection displacement generated by bending deformation of the prepared sample were collected by means of analytical balance,laser displacement sensor and other testing methods.Electrochemical testing methods were used to test the specific capacitance and stability of the prepared sample.The micromorphology and elastic modulus of the prepared samples were analyzed and characterized by scanning electron microscopy,universal material machine and other physical means.Finally,the deflection phenomenon of the prepared samples was explained.The results are as follows:Using carboxymethyl chitosan as the base material,the biogel-like electric actuator material was assembled by heating and freezing preparation processes,and the force output performance of the chitosan-type electric actuator was studied by selecting different preparation processes influence.The results show that the maximum output force of the electric actuator prepared by the freezing method is 5.68 m N,and the maximum deflection displacement is 7.81 mm,which is 2.2 times and 1.6 times that of the heating method,and the preparation by the freeze-drying method further broadens the transmission channel of ions in the sample,the internal ions are stimulated by the electric field to move faster,so that the output force and deflection displacement of the electric actuator gradually increase.However,excessive addition will cause the internal channel to be blocked,which will reduce the performance of the prepared sample.Chitosan-type biogel electric actuators were prepared by freezing technology using different proportions of tannic acid.It is found that proper cross-linking is beneficial to modify the internal dense and uniform structure into a loose and porous structure,promote the migration of ions,improve the electrochemical performance of the prepared sample,and then improve the output performance of the electric actuator.When 20 mg and 30 mg of tannic acid were added,the output force and deflection displacement of the electric actuator were larger,and the maximum output force was 6.30 m N and 6.75 m N,respectively.At the same scan rate(50 m V/s),the specific capacitance of the sample increases first and then gradually decreases,corresponding to the trend of output force and deflection displacement first increasing and then decreasing.The biogel-like electric actuator based on carboxymethyl chitosan was prepared by freezing technology.Tannic acid and carboxymethyl cellulose are used as additives,and their fibrous network structure will expand the internal ion storage space of the sample and accelerate the ion migration rate,thereby effectively improve the deflection displacement and output of the electric actuator force.The results showed that the specific capacitances of samples(S1)and(S3)were 73.86 m F/g and 71.61 m F/g,respectively,which were 1.22 times and 1.18 times that of the samples without cross-linking treatment.At the same time,the scanning electron microscope also shows that after the freezing technology,the low temperature can make the water molecules form fine particles and distribute evenly,and finally present a channel structure,which improves the performance of the biogel electric actuator and makes it useful in the field of intelligent robots.Lay the foundation for the application prospect.