基于可逆邻苯二酚-硼酸酯络合的pH响应和抗氧化湿胶,Chemistry of Materials

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基于可逆邻苯二酚-硼酸酯络合的pH响应和抗氧化湿胶
Chemistry of Materials ( IF 7.2 ) Pub Date : 2016-07-25 00:00:00 , DOI: 10.1021/acs.chemmater.6b01851
Ameya R. Narkar ₁ , Brett Barker ₁ , Matthew Clisch ₁ , Jingfeng Jiang ₁ , Bruce P. Lee ₁

Affiliation

通过使多巴胺甲基丙烯酰胺（DMA）和3-丙烯酰胺基苯基硼酸（AAPBA）共聚，制备了一种能够粘合到润湿表面的智能粘合剂。pH值用于控制DMA邻苯二酚侧链的氧化态和粘附性，并引发邻苯二酚-硼酸酯络合。FTIR光谱证实在pH 9时复合物的形成，而在pH 3时不存在。邻苯二酚-硼酸酯复合物的形成增加了粘合剂网络的交联密度。最值得注意的是，与在pH 3下测量的粘合剂相比，在pH 9下孵育的粘合剂的粘合剂的损耗模量值高出一个数量级。这种粘性耗散性能的急剧增加归因于可逆络合物的引入。粘合剂网络。（W _adh）＝ 2000mJ / m ²）至用酸性溶液（pH 3）润湿的硼硅酸盐玻璃。当pH增加到9时，W _adh值（180mJ / m ²）下降超过一个数量级。在连续的接触循环中，随着pH值的变化，胶粘剂具有在其胶粘状态和非胶粘状态之间可逆转变的能力。仅包含DMA的胶粘剂对pH的重复变化反应缓慢，并逐渐被氧化，而没有保护硼酸。虽然粘合剂仅含有AAPBA也表现出强的湿粘附性（w ^ _ADH〜为500mJ /米²），其粘合性能对pH值无响应。DMA和AAPBA都需要制造具有可调和可逆粘合剂性能的智能粘合剂。

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pH Responsive and Oxidation Resistant Wet Adhesive based on Reversible Catechol–Boronate Complexation

A smart adhesive capable of binding to a wetted surface was prepared by copolymerizing dopamine methacrylamide (DMA) and 3-acrylamido phenylboronic acid (AAPBA). pH was used to control the oxidation state and the adhesive property of the catechol side chain of DMA and to trigger the catechol–boronate complexation. FTIR spectroscopy confirmed the formation of the complex at pH 9, which was not present at pH 3. The formation of the catechol–boronate complex increased the cross-linking density of the adhesive network. Most notably, the loss modulus values of the adhesive were more than an order of magnitude higher for adhesive incubated at pH 9 when compared to those measured at pH 3. This drastic increase in the viscous dissipation property is attributed to the introduction of reversible complexation into the adhesive network. Based on the Johnson Kendall Roberts (JKR) contact mechanics test, adhesive containing both DMA and AAPBA demonstrated strong interfacial binding properties (work of adhesion (W_adh) = 2000 mJ/m²) to borosilicate glass wetted with an acidic solution (pH 3). When the pH was increased to 9, W_adh values (180 mJ/m²) decreased by more than an order of magnitude. During successive contact cycles, the adhesive demonstrated the capability to transition reversibly between its adhesive and nonadhesive states with changing pH. Adhesive containing only DMA responded slowly to repeated changes in pH and became progressively oxidized without the protection of boronic acid. Although adhesive containing only AAPBA also demonstrated strong wet adhesion (W_adh ∼ 500 mJ/m²), its adhesive properties were not pH responsive. Both DMA and AAPBA are required to fabricate a smart adhesive with tunable and reversible adhesive properties.

更新日期：2016-07-25

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