. 2010, 28(18): 47-51.
耐电压；N-异丙基丙烯酰胺；甲基丙烯酸N,N-二甲氨基乙酯；水凝胶The electric-field sensitive hydrogel, composed of macromolecule's three-dimensional network and water, could bend and deswell under the action of an electric field. A series of electric field sensitive gels were prepared by free-radical polymerization with
N-isopropylacrylamide(PNIPAAm) and N-(2-(dimethylamino)ethyl)-methacrylamide(DMAEMA) as the monomers, N,N′-methylene bisacrylamide as the crosslinking agent, ammounium persulfate and sodium bisulfite as the redox initiator. The influences of the concentration of aqueous NaCl solutions, temperature and contacting DC electric field on the swelling ratios of the hydrogels were studied in detail. It is shown that the equilibrium swelling ratios decrease as the NIPAAm and the concentration of NaCl increase. Even in a normal saline with concentration of 0.9%, the equilibrium swelling ratio can be around 89g/g, that is to say, the retention is around 44%. The obtained hydrogels, with LCST around 43℃, could be a kind of temperature sensitive materials. Under the action of a contacting DC electric field, the Rm of hydrogels decreases as DMAEMA increases. Traditionally, the hydrogel prepared by anion or cation monomer, could deswell in an electric field. But in this paper, the hydrogel was prepared by copolymerization with anion monomer and non-ionic, the relationship between Rm and time could be described with fitting formulas, which indicate that the water retention could reach 53%. Due to the excellent voltage tolerance, the gels can be applied in the artificial muscle and bionic technology, and can substitute conventional metal fuses in the future.
