Preparation and Multiple Stimulus Responsiveness of Inverse Opal Hydrogel with Low Chemical Cross-Linking Degree
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摘要:
将物理交联与化学交联相结合，利用蛋白石结构光子晶体模板法制备了低化学交联的聚N-异丙基丙烯酰胺/丙烯酸（C-dots/BIS-P(NIPAm-AA)）反蛋白石结构光子晶体水凝胶(IOHP(NIPAm-AA))。其中，pH 敏感性单体丙烯酸(AA)和温敏性单体N-异丙基丙烯酰胺(NIPAm)的引入赋予了IOHP(NIPAm-AA)多重刺激响应性。通过扫描电镜表征了IOHP(NIPAm-AA)的内部微观结构，探究了共聚单体AA 含量对IOHP(NIPAm-AA)的影响，并基于结构色的变化来研究IOHP(NIPAm-AA)对外部刺激的响应行为。结果表明，低化学交联的IOHP(NIPAm-AA)具有规整有序的三维大孔结构。随着共聚单体AA 用量从0.54 mL 增大到0.9 mL，IOHP(NIPAm-AA)的结构色由蓝色转为蓝绿色再变为黄绿色，同时反射光谱发生了明显的红移。IOHP(NIPAm-AA)对pH、温度和溶剂有灵敏的响应，在这些因素刺激下，IOHP(NIPAm-AA)的结构色发生显著变化，其最大反射峰波长也产生了相应的移动。因温敏性单体NIPAm 的存在，IOHP(NIPAm-AA)的结构色在近40 ℃呈现可逆的出现-消失。
Abstract:
Combining physical cross- linking and chemical cross- linking, a kind of poly(N- isopropylacrylamideacrylic acid) inverse opal hydrogel with low chemical cross-linking degree (IOHP(NIPAm-AA)) was prepared based on poly styrene(PS) photonic crystal template. pH-responsive monomer acrylic acid (AA) and temperature-responsive monomer N- isopropylacrylamide (NIPAm) were introduced into the inverse opal system to provide multiple stimulus responsiveness. The microstructure of IOHP(NIPAm-AA) was characterized by SEM and the result illuminate that IOHP(NIPAm-AA) has a well- ordered three- dimensional macroporous structure.The responses of the IOHP(NIPAm- AA) to external stimuli were investigated based on the structural color. With the increase of AA content from 0.54 mL to 0.9 mL,the structural color of IOHP(NIPAm- AA) changes from blue to blue-green and then to yellow- green, and λmax of IOHP(NIPAm- AA) shows a obvious red- shift. The structural color and reflection peak wavelength of IOHP(NIPAm- AA) are changed significantly under pH and solvent stimuli. Thanks to the temperature- responsive monomer NIPAm, the structural color exhibits a reversible appearance-disappearance at nearly 40 ℃.