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Mechanical Behavior of Polymer Gels for RDCs and RCSAs Collection: NMR Imaging Study of Buckling Phenomena

机译:用于RDC和RCSA的聚合物凝胶的机械行为:屈曲现象的NMR成像研究

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摘要

Anisotropic NMR parameters, such as residual dipolar couplings (RDCs), residual chemical shift anisotropies (RCSAs) and residual quadrupolar couplings (RQCs or (Q)), appear in solution-state NMR when the molecules under study are subjected to a degree of order. The tunable alignment by reversible compression/relaxation of gels (PMMA and p-HEMA) is an easy, user-friendly, and very affordable method to measure them. When using this method, a fraction of isotropic NMR signals is observed in the NMR spectra, even at a maximum degree of compression. To explain the origin of these isotropic signals we decided to investigate their physical location inside the NMR tube using deuterium 1D imaging and MRI micro-imaging experiments. It was observed that after a certain degree of compression the gels start to buckle and they generate pockets of isotropic solvent, which are never eliminated. The amount of buckling depends on the amount of cross-linker and the length of the gel.
机译:当所研究的分子处于一定程度的有序状态时,溶液状态NMR中会出现各向异性NMR参数,例如残留的偶极偶联(RDC),残留的化学位移各向异性(RCSA)和残留的四极偶联(RQC或(Q))。 。通过凝胶(PMMA和p-HEMA)的可逆压缩/松弛进行可调谐对齐是一种简单,用户友好且非常经济的测量方法。使用此方法时,即使在最大压缩程度下,在NMR谱图中也观察到一部分各向同性NMR信号。为了解释这些各向同性信号的起源,我们决定使用氘1D成像和MRI微成像实验研究其在NMR管内的物理位置。观察到,在一定程度的压缩之后,凝胶开始弯曲并且它们产生各向同性溶剂的囊,这些囊从未被消除。屈曲的量取决于交联剂的量和凝胶的长度。

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