Small and large amplitude oscillatory shear behavior of supramolecular gels based on dopamine-boronic acid interactions
Small and large amplitude oscillatory shear behavior of supramolecular gels based on dopamine-boronic acid interactions
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基于多巴胺-硼酸相互作用的超分子凝胶小振幅和大幅度振荡剪切行为
DOI：
10.1122/1.5068709
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发表时间：
2019-05-01
影响因子：
3.3
通讯作者：
Stadler, Florian J.
中科院分区：
文献类型：
--
作者：
Du, Lei;Biswas, Chandra Sekhar;Stadler, Florian J.
研究了聚（N-异丙基丙烯酰胺-co-多巴胺甲基丙烯酰胺）（NIDO）和聚（N-异丙基丙烯酰胺-co-4-乙烯基苯基硼酸）（NIBA）在水溶液中的共混物在pH约为9时的流变学。NIDO的功能性邻苯二酚基团和NIBA的硼酸基团可以形成配位复合物，这些配位复合物是强的，但可以通过高变形而被破坏，而它们可以在宏观尺度上在1 min内快速重构。这些材料的线性和非线性行为的变化显着不同的组分混合比。在10 w/v %的总聚合物浓度下，与不对称共混物相比，两种聚合物的1：1混合物（w（NIBA）/w（NIDO））产生最强的凝胶。材料的非线性强度（I-n/I-1）随应变γ（0）成比例地增加，但一旦达到显著的非线性，它们表现出较低的非线性强度，这与常规的非缔合单相聚合物熔体和溶液不同。大振幅振荡剪切表征将阐明聚合物NIDO和NIBA的相互作用以及所形成的超分子凝胶的性质。(C)2019年流变学学会。
Blends of polymer solutions of poly(N-isopropylacrylamide-co-dopamine methacrylamide) (NIDO) and poly(N-isopropylacrylamide-co-4-vinylphenylboronic acid) (NIBA) in aqueous solutions were studied rheologically at pH approximate to 9. The functional catechol group of NIDO and the boronic acid group of NIBA could form coordinative complexes, which are strong, yet could be broken by high deformation, while they could reconfigure quickly within 1 min on a macroscopic scale. The linear and nonlinear behaviors of these materials vary significantly for different component mixing ratios. At a total polymer concentration of 10 w/v %, the 1:1 mixture (w(NIBA)/w(NIDO)) of the two polymers yields the strongest gel compared with asymmetric blends. The nonlinearity intensities (I-n/I-1) of the materials increase proportionately with strain gamma(0), but once a significant nonlinearity is reached, they show lower nonlinearity intensities, which is unlike regular nonassociative single phase polymer melts and solutions. Interaction of polymer NIDO and NIBA and the formed supramolecular gels' properties will be clarified by large amplitude oscillatory shear characterization. (C) 2019 The Society of Rheology.