论文部分内容阅读
以4-乙酰基丙烯酰乙酸乙酯(AAEA)、2-丙烯酰胺基-2-甲基-1-丙磺酸(AMPS)为单体,不同分子量的聚乙二醇(PEG)为成孔剂,通过自由基溶液聚合法,合成了新型多孔快速响应电场敏感性水凝胶.结果表明,成孔剂PEG被洗脱后在凝胶内部形成了互相贯穿的孔洞结构,孔径在30～120μm之间.以PEG6000为成孔剂致孔后的多孔凝胶溶胀速率和消溶胀速率最快,在去离子水中30s达到溶胀平衡,在0.1mol/L的NaCl溶液中40min达到消溶胀平衡;电场作用下凝胶的消溶胀速度大大加快,12min内即可达到平衡.凝胶中AMPS含量的增多会加快凝胶在电场中的响应速度;而高温下,随着AAEA含量的增加,凝胶内部疏水基团增多并收缩产生大量的疏水微区,限制了凝胶内部水分的持续排出,因此n(AAEA)∶n(AMPS)=3∶1的凝胶4min内即可排出表面水分达到消溶胀平衡,可保水率却高达75%.同时,增大电解液的pH值、浓度以及提高电解电压,均会加快凝胶的消溶胀行为.
Using polyethylene glycol (PEG) with different molecular weight as the monomer and using ethyl 4-acetylacryloylacetate (AAEA) and 2-acrylamido-2-methyl-1-propane sulfonic acid Agent was synthesized by free radical polymerization, a new type of porous fast response field-sensitive hydrogel was synthesized. The results showed that the pore-forming agent PEG formed an interpenetrating pore structure in the gel after its elution, with a pore size of 30-120 μm .The swelling rate and deswelling rate of porous gel with PEG6000 as pore-forming agent were the fastest, swelling equilibrium was reached in deionized water for 30s and deswelling equilibrium in 0.1mol / L NaCl solution for 40min. The electric field Under the action of the gel, the deswelling rate of the gel is greatly accelerated, and the equilibrium can be reached in 12 minutes. The increase of the AMPS content in the gel will accelerate the response speed of the gel in the electric field; at high temperature, with the increase of AAEA content, Therefore, n (AAEA): n (AMPS) = 3: 1 gel can expel the surface moisture to deswell for 4min when the hydrophobic groups increase and shrink to produce a large number of hydrophobic micro-domains, which limits the continuous discharge of water inside the gel. Balance, but the water retention rate is as high as 75%. At the same time, increasing the pH of the electrolyte, the concentration and improve the electrolysis Voltage, will accelerate the elimination of gel swelling behavior.