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首页> 外文期刊>Journal of Applied Polymer Science >Temperature-, pH-, and Ion-Stimulus-Responsive Swelling Behaviors of Poly(dimethylaminoethyl methacrylate) Gel Containing Cholic Acid
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Temperature-, pH-, and Ion-Stimulus-Responsive Swelling Behaviors of Poly(dimethylaminoethyl methacrylate) Gel Containing Cholic Acid

机译：含胆酸的聚（甲基丙烯酸二甲氨基乙酯）凝胶的温度，pH和离子刺激响应溶胀行为

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摘要

Poly(dimethylaminoethyl methacrylate) hydrogels containing cholic acid (PDMAEMA-CA) were synthesized by radiation crosslinking. The introduction of 10 and 20 mol% cholic acid (CA) into the poly(dimethylaminoethyl methacrylate) (PDMAEMA) hydrogel decreased the maximum swelling ratio (SR) of the gel from 40 to 6 and 5, respectively. The incorporation of CA with dimethylaminoethyl methacrylate led to a decrease in the lower critical swelling temperature of the gel from 44 to 42℃ but did not exert big influence on the ion-stimulus-responsive properties of the gel. However, the pH sensitivity of the PDMAEMA-CA gel was quite different from that of PDMAEMA gel. The SR of PDMAEMA gel decreased at pH 2.5, whereas the SRs of the PDMAEMA-CA gels showed a convex-upward function of pH; that is, SR of the PDMAEMA-10% CA gel first increased (pH 1.2-3.2) and then decreased (pH 3.2-11.9) with increasing pH. The pH-stimulus-responsive swelling behavior of the PDMAEMA-20% CA gel was similar to that of the PDMAEMA-10% CA gel except for the unique swelling behavior exhibited in the lower pH region. The unique decrease in SR in strong acidic solutions was attributed to aggregations driven by the hydrophobic interactions between CA molecules. Phase separation of the gel in strongly acidic solutions was observed; that is, the margin of the swollen gel was transparent and elastic (cellular structure), whereas the core of it was opaque (aggregated structure) as recorded by scanning electron microscopy.
机译：通过辐射交联合成了含有胆酸的聚（甲基丙烯酸二甲氨基乙酯）水凝胶（PDMAEMA-CA）。将10和20 mol％的胆酸（CA）引入到聚（甲基丙烯酸二甲氨基乙酯）（PDMAEMA）水凝胶中，将凝胶的最大溶胀率（SR）从40分别降低到6和5。 CA与甲基丙烯酸二甲基氨基乙基酯的掺入导致凝胶的较低临界溶胀温度从44℃降低至42℃，但对凝胶的离子刺激响应性没有太大影响。但是，PDMAEMA-CA凝胶的pH敏感性与PDMAEMA凝胶的pH敏感性完全不同。 PDMAEMA凝胶的SR在pH 2.5时降低，而PDMAEMA-CA凝胶的SR显示pH的向上凸功能;也就是说，PDMAEMA-10％CA凝胶的SR首先随着pH的升高而增加（pH 1.2-3.2），然后降低（pH 3.2-11.9）。 PDMAEMA-20％CA凝胶的pH刺激响应溶胀行为与PDMAEMA-10％CA凝胶相似，除了在较低pH区域表现出独特的溶胀行为。强酸性溶液中SR的独特降低是由于CA分子之间的疏水相互作用驱动的聚集。观察到凝胶在强酸性溶液中的相分离。即，通过扫描电子显微镜观察，溶胀的凝胶的边缘是透明且有弹性的（细胞结构），而其核心是不透明的（聚集的结构）。

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