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Double quantum NMR applied to polymer networks with low concentration of pendant chains

机译:双量子NMR应用于低浓度侧链的聚合物网络

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摘要

The influence of pendant chains at low concentrations in poly( dimethylsiloxane) networks is studied using double quantum proton nuclear magnetic resonance. Small relative variations of the average molecular weight of the elastically active chains, the molecular weight of pendant chains, and the concentration of pendant chains were analyzed. Changes induced by these defects in the residual dipolar couplings are related to changes in the viscoelastic relaxation times and compared against the behavior of the elastic shear modulus. A very good correlation between NMR measurements and the corresponding rheological experiments is found.
机译:使用双量子质子核磁共振研究了低浓度侧链在聚二甲基硅氧烷网络中的影响。分析了弹性活性链的平均分子量,侧链的分子量和侧链浓度的较小相对变化。由残余偶极耦合中的这些缺陷引起的变化与粘弹性弛豫时间的变化有关,并与弹性剪切模量的行为进行比较。发现NMR测量值和相应的流变学实验之间具有很好的相关性。

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