光-pH双重响应共聚凝胶的合成和响应性能研究.pdfVIP

光-pH双重响应共聚凝胶的合成及响应性能研究 赵义平 陈莉 张 青 松 张玉欣 王刚 天津工业大学材料科学与工程学院，天津市改性与功能纤维重点实验室，天津300160 摘要：采用自由基共聚合方法，将含偶氮苯基团的可反应性中间单体丙烯酰胺基偶氮苯(AAAB)与丙烯酸 (AA)共聚合，制备了一种具有pH和紫外光双重响应特性的新型智能高分子凝胶P(AA-co-AAAB)，研究了 共聚凝胶对pH和紫外光的响应性。研究结果表明，P(AA-co-AAAB)共聚凝胶在酸性环境中平衡溶胀率较 小，随着pH值的升高，共聚凝胶的平衡溶胀率逐渐升高，在pH为4～6的范围内突然增大，而后趋于平缓， 表现出良好的pH响应性。共聚凝胶在紫外光作用下，体积明显收缩，光照停止后，体积又逐渐恢复到原来的 溶胀状态，表现出较好的紫外光响应性及响应可逆性。 关键词：高分子凝胶;光响应性；pH响应性 Preparationandpropertiesstudyofpoly(AA-co-AAAB) hydrogelswithphotoresponseandpH-sensitivity ZHANYipingCHEN LiZHANGQingsongZHANG YuxinWANGGang TianjinKeyLaboratoryofFiberModificationandFunctionalFiber,SchoolofMaterialsScienceand Engineering,TianjinPolytechnicUniversity,Tianjin300160,China Abstract:Aphotoresponsivehydrogelofpoly(acrylicacid-co-acrylamidoazobenzene) [P(AA-co-AAAB)]was preparedviaafree-radicalcopolymerizationroutewithacrylicacid(AA)andacrylamidoazobenzene(AAAB)which containsofazobenzenegroups,andthepHandUVresponsivebehaviorswerestudied.Theresultsdisclosedthat theP(AA-co-AAAB)hydrogelhaspH-sensitivity.Theshrinkingratioofthecopolymerhydrogelinacidislow, butincreasedwiththeincreasingofpH.ThedegreeofswellingabruptlyincreasedinthepHregionof4～6andthen becamesaturated.TheresultsalsoshowedthattheP(AA-co-AAAB)hydrogelpossessgoodphotoresponsiveprop ertytoUVirradiation,andthephotoresponsivebehaviorisreversiblewiththetransformationbetweenUVandvisi blelightirradiation.WiththeincreaseofthetimeofUVirradiation,thevolumeofthehydrogeldecreased,and thenincreasedwiththeextendingofthetimeafterUVirradiation. Keywords:polymerhydrogels;photoresponse;pH-sensitivity 一厂；丙烯酌 至蒸馏提纯； 农删所耳 安一定刊 测量凝彤 ，将盛苇 疑胶体积舟 卟光照射． 琵胶的体{ re|ling ～1047 ~lei,Ik~