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Elucidation of the chemical and morphological structure of double-network (DN) hydrogels by high-resolution magic angle spinning (HRMAS) NMR spectroscopy

机译:通过高分辨率魔角旋转(HRMAS)NMR光谱阐明双网络(DN)水凝胶的化学和形态结构

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摘要

~1H HRMAS NMR spectroscopy is applied to gain insight into the chemical and morphological structure of double-network (DN) hydrogels, prepared from poly(2-acrylamido-2-methyl-1-propanesulfonic acid) (PAMPS) and poly(acrylamide) (PAAm). The method enables one to obtain detailed information at the molecular level about the formation of covalent bonds between the two polymer networks through non-reacted double bonds of the cross-linker N,N′-methylene bis(acrylamide) (MBAA). Evidence to the existence of strong hydrogen-bond interactions based on the N-H group of the PAMPS as a hydrogen-bond donor and the C=O group of the PAAm as a hydrogen-bond acceptor is also provided. These findings clarify the origin of the toughening mechanism and the exceptionally strong mechanical properties of DN gels, further supported by microhardness data.
机译:使用〜1H HRMAS NMR光谱来深入了解由聚(2-丙烯酰胺基-2-甲基-1-甲基磺酸)(PAMPS)和聚(丙烯酰胺)制成的双网络(DN)水凝胶的化学和形态结构(PAAm)。该方法使人们能够在分子水平上获得有关两个聚合物网络之间通过交联剂N,N'-亚甲基双(丙烯酰胺)(MBAA)的未反应双键形成的详细信息。还提供了基于PAMPS的N-H基团作为氢键供体和PAAm的C = O基团作为氢键受体的强氢键相互作用的证据。这些发现阐明了增韧机理的起源以及DN凝胶异常强的机械性能,并进一步得到了显微硬度数据的支持。

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