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OALib Journal期刊
ISSN: 2333-9721
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亲水链段长度对液晶模板水凝胶形态和温敏性的影响
DOI: 10.3724/SP.J.1105.2013.12275, PP. 841-848
Keywords: 水凝胶,N-异丙基丙烯酰胺,模板,表面活性剂,温敏性
Abstract:
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(Brij52/56/58)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.15wt%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7min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Brij58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6.9g/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7.9g/g,37℃下20min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.
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