高强度水凝胶P(HEMA-co-NEVER)溶胀特性的研究  

Swelling Properties of p(HEMA-co-NEVER) High-strength Copolymeric Hydrogels

作　　者：林智辉[1] 吴文辉[1] 王建全[1] 靳昕[2] 

机构地区：[1]北京理工大学材料科学与工程学院,北京100081 [2]中国石化集团北京燕山石油化工有限公司,北京102500

出　　处：《精细化工》2007年第11期1043-1046,1060,共5页Fine Chemicals

基　　金：中国石化集团总公司科研基金(P0043)~~

摘　　要：该文研究了酚醛环氧型乙烯基酯树脂(NEVER)/甲基丙烯酸-β-羟乙酯(HEMA)共聚水凝胶的溶胀性质。NEVER质量分数的增大,加强了水凝胶内部疏水基团间的相互作用,使平衡含水量EWC从39.7%下降到15.9%,聚合物体积分数φ2从0.5440上升到0.8085。溶胀介质离子强度增大,极性增强,形成了更加紧密的低溶胀水凝胶,导致产生盐出效应,水凝胶初始溶胀速率r0从0.189g水·g-1干胶·h-1下降到0.047g水·g-1干胶·h-1,理论最大吸水量S∞也从0.395g水·g-1干胶降到0.364g水·g-1干胶。水凝胶溶胀初期表现为Fickian行为,扩展溶胀符合Schott二级动力学方程。当温度由278K升至323K,水凝胶样品H/N3的r0从0.060g水·g-1干胶·h-1升高到0.287g水·g-1干胶·h-1,但S∞却从0.559g水·g-1干胶降到0.351g水·g-1干胶。热力学研究表明,水凝胶在水中的溶胀过程是放热过程。The swelling properties of epoxy vinyl ester resin （ NEVER ）/2-hydroxyethyl methacrylate （HEMA） copolymeric hydrogels were investigated. Increase of wt% of NEVER can enhance the hydrophobic bonding within the hydrogel, leading to the decrease in equilibrium water content （EWC） from 39. 7 to 15.9% and the increase in volume fraction of polymer in hydrogel （φ2） from 0. 544 0 to 0. 808 5. Increase of ionic strength of the swelling medium enhances its polarity, resulting in stronger hydrophobic bonding in the hydrogel, and then the initial swelling rate （ r0 ） decreases from 0. 189 to 0. 047 （g water）· （g xerogel）^-1· h^-1, and the maximum theoretical water content （S∞） also decreases from 0. 395 to 0. 364 （g water）/（g xerogel）. The initial swelling process exhibits Fickian behavior and the extensive swelling process follows the Schott second order dynamic equation. When the temperature increases from 278 K to 323 K, the hydrogel H/N3 undergoes increasing in r0 and decreasing in S∞. The thermodynamic analysis indicates that the swelling process is an exothermic process.

关 键 词：酚醛环氧型乙烯基酯树脂 甲基丙烯酸-Β-羟乙酯 水凝胶 溶胀性质 功能材料 

分 类 号：O632.72[理学—高分子化学]