AM/DMDAAC共聚水凝胶的电场敏感性能

 为研究阳离子性DMDAAC共聚物水凝胶的电场敏感性能,以丙烯酰胺(AM)和二甲基二烯丙基氯化铵(DMDAAC)为单体,N,N'-亚甲基双丙烯酰胺为交联剂,过硫酸铵和亚硫酸氢钠为氧化还原引发剂,采用水溶液聚合法制备了AM/DMDAAC共聚物水凝胶,考查样品水凝胶在外加直流电场刺激下的消溶胀动力学和弯曲行为。研究表明,DMDAAC单体含量、施加电压的时间和施加电压大小以及所在溶液的离子强度对水凝胶的电敏感性能有着显著影响,有望使其在化学阀、仿生驱动器方面得到应用。在低浓度NaCl溶液中向正极弯曲,随着NaCl质量分数的增加,向正极弯曲角度逐渐减小,并进一步向负极弯曲。影响凝胶弯曲角度转变的临界NaCl质量分数为0.3%—0.4%,不同的单体配比,其临界NaCl质量分数也不一样。

Electric Field Sensitive of Poly(AM-Co-DMDAAC) Hydrogels

In order to study the electric field sensitive of cation character DMDAAC hydrogels, Acrylamide/Dimethyldiallylammonium chloride (AM/DMDAAC) hydrogels are prepared by free radical copolymerization in aqueous solution in the presence of N,N methylene bis (acrylamide) (MBAAm) as the crosslink agent, ammonium per sulfate and sodium bisulfite as the redox initiator. Deswelling kinetics and bending behaviors of the sample hydrogels under electric stimulus are illustrated. It is found that monomer amount of DMDAAC, the time as well as the size of applied voltage, and the ion intensity of solution have a favorable impact on the electric sensitive properties of the AM/DMDAAC hydrogels. It might have applications in chemical valve and bionic actuator. Hydrogels display a bending toward anode in NaCl solution of low chroma. The bending toward anode is depressing along with NaCl chroma increasing. Hydrogels show a bending toward cathode in NaCl solution of high chroma. The banding angle of hydrogels is affected by the critical chroma of NaCl from 0.3% to 0.4%. Since these hydrogels are made up of different monomer content, the critical chroma of NaCl is also different.