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采用疏水烷基(C16H33)相同而亲水的聚氧乙烯链(CH2CH2O)n=2,10,20长度不同的表面活性剂苄泽(Brij 52/56/58)作为模板制备得到3种孔洞尺寸为5～80μm的聚异丙基丙烯酰胺水凝胶(HNB).研究表明,n值越小,疏水性越大.15 wt%浓度下,不同n值的Brij水溶液均呈现明显的液晶织构.在t=4和7 min时HNB58和HNB56凝胶预聚液的透光率迅速下降至3.3～3.5,而HNB52凝胶预聚液的透光度一直保持在3.5.以n=20的Brij 58作为模板制备的HNB58凝胶孔洞数量多,尺寸为5～10μm.以n=2的Brij52为模板制备的HNB52凝胶孔洞形态呈层状,溶胀度最小,为6.9 g/g.而以n=10的Brij56为模板制备的HNB56凝胶孔洞呈蜂窝状,尺寸最大,为40～80μm,溶胀度最高,为7.9 g/g,37℃下20 min时HNB56失水超过80%.由于模板的作用,n值的变化并没有改变HNB凝胶的体积相转变温度(VPTT≈33℃),但吸热峰面积变宽.
Three kinds of pore sizes were prepared by using Brij 52/56/58, a surfactant of the same and hydrophilic polyoxyethylene chain (CH 2 CH 2 O) n = 2, 10 and 20 in hydrophobic alkyl (C16H33) Is 5 ~ 80μm polyisopropylacrylamide hydrogel (HNB) .The results show that the smaller the value of n, the greater the hydrophobicity.With the concentration of 15wt%, different n-value Brij aqueous solution showed a clear liquid crystal texture At t = 4 and 7 min, the light transmittance of HNB58 and HNB56 gel prepolymers decreased rapidly to 3.3 ~ 3.5, while the transmittance of HNB52 gel prepolymers remained at 3.5. With Brij 58 as a template prepared HNB58 gel number of holes, the size of 5 ~ 10μm to n = 2 Brij52 prepared template HNB52 gel morphology layered, the smallest swelling, 6.9 g / g.With n = 10 Brij56 prepared as template HNB56 gel was honeycomb, the largest size, 40 ~ 80μm, the highest degree of swelling, was 7.9 g / g, HNB56 more than 80% loss of water at 37 ℃ under 20min. The change of n value did not change the volume phase transition temperature (VPTT≈33 ℃) of HNB gel, but the area of endothermic peak broadened.