Preparation And Properties Of Gelatin Hydrogel With Electrical Response Properties

In order to prepare hydrogels with excellent performance of the electrical response,we used gelatin as matrix in this paper. Based on the principle of electric field response,the molecular chains of gelatine were modified by glycidyl methacrylate, sodium bisulfite and aniline, introducing polar groups on the gelatin molecule chains.This paper mainly explored impact the amount of modifier and the external electric field strength.This response primarily focused on changes in the storage modulus after external DC electric field stimulation.Specific analysis by infrared spectroscopy.Storage modulus about hydrogel was tested by dynamic viscoelastic spectrometer DMAQ800 test.In addition, the difference about the storage modulus between the hydrogels gelled in presence or absence of an electric field was tested to study the electrical properties of the hydrogel response.The specific experimental conditions responsive about four hydrogels was presented as follows:1.Using glycidyl methacrylate as modifier,the gelatin and GMA was dissolved in an acidic solution according to a certain molar ratio at a temperature for a period of time,then a certain amount of hydrogen peroxide oxidation was added the system,followed a different sodium bisulfite solution was mixed.A quantitative glutaraldehyde was mixed uniformly for cross-linking.The solution were poured into plexiglass box,and the sample were placed it under normal temperature conditions applying an external electric field.We can be obtained in two different at this hydrogels stage:A-hydrogels (E?0kV/mm) and B-hydrogels (E=0 kV/mm).The A-hydrogels were prepared, which applied electric field is 0.8?1.6 kV/mm.The storage of modulus which is greater than the modulus of power without the gel prepared,and its storage with the growing modulus applied electric field intensity increases.Under the same applied electric field,the greater the degree of sulfonation,the better the performance in response to an electric field. This indicates that the sulfonated gelatin hydrogel has a positive response.And the larger the electric field intensity applied, the response is more obviously. Through the environmental scanning electron microscope observe structure of the hydrogel,we found external structure of the electric field applied have a more orderly structure,which ordered a further description of this hydrogel electric field had a positive response.2.We used aniline as a modifier. gelatin was dissolved in acetic acid solution with different mass ratio at a temperature and reacted for a time.Then a certain amount of glutaraldehyde solution was added.the solution was poured powered into glass box and stored under room temperature conditions with an external electric field applied,and then we can obtain two different hydrogels:A-hydrogels (E?0 kV/mm) and B-hydrogels(E=0 kV/mm). For obtaining the A-hydrogels DC voltage was applied electric field intensity of 0.4?1.6 kV/mm.Experimental results show that Gelatin-g-ANI hydrogels generated a positive response,and the greater the intensity of the electric field was applied,the stronger this response was.3.In a similar manner was revealed that Al3+ link Gelatin-g-ANI hydrogel.We use aniline as a modifier,gelatin was dissolved in acetic acid solution with different mass ratio of aniline at a temperature and reacted for a period of time.A certain amount of glutaraldehyde solution was added,then an appropriate amount of aluminum trichloride was added and reacted for a period of time.The uniformly miixed solution was poured into plexiglass box and placed under normal temperature conditions under an external electric field.We can obtain two different hydrogels:A-hydrogels (E?0 kV/mm) and B-hydrogels (E=0 kV/mm).Experimental results show Al3+ cross-linked Gelatin-g-ANI hydrogels generated a positive response, and the applied electric field the greater the intensity,the stronger this response was.