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首页> 外文期刊>Applied Magnetic Resonance >Study of Self-Diffusion of Silicone MQ Resins in Chloroform Solutions by Pulsed Field-Gradient NMR Spectroscopy
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Study of Self-Diffusion of Silicone MQ Resins in Chloroform Solutions by Pulsed Field-Gradient NMR Spectroscopy

机译：脉冲场梯度NMR光谱法研究有机硅MQ树脂在氯仿溶液中的自扩散

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摘要

The self-diffusion of silicone MQ copolymers in solutions with chloroform was studied by pulsed field-gradient nuclear magnetic resonance over a wide range of macromolecular concentrations. The highly branched structure of the molecules reveals some characteristic features of the translational mobility. The studies were performed with the initial MQ copolymer as well as with the narrowdispersed fractions obtained from it. The data indicate the differences in dynamics between fractions. The appearance of the species with different self-diffusivity with increasing of the polymer concentration in solutions was observed. Such behavior was attributed to the formation of aggregates of macromolecules in solution. The results show that the molecular weight influences the diffusion behavior of the MQ resins in solutions. The diffusion of the MQ resins reveals features characteristic for rigid macromolecular structures rather than flexible polymers. Differences in translational dynamics of MQ copolymers, linear flexible polymers and particle-like macromolecules are discussed.
机译：通过脉冲场梯度核磁共振在大分子浓度范围内研究了有机硅MQ共聚物在氯仿溶液中的自扩散。分子的高度分支结构揭示了平移迁移率的一些特征。使用初始的MQ共聚物以及从中获得的窄分散级分进行了研究。数据表明各馏分之间动力学的差异。随着溶液中聚合物浓度的增加，观察到具有不同自扩散性的物质的出现。这种行为归因于溶液中大分子聚集体的形成。结果表明，分子量影响MQ树脂在溶液中的扩散行为。 MQ树脂的扩散揭示了刚性大分子结构而不是柔性聚合物的特征。讨论了MQ共聚物，线性柔性聚合物和类颗粒大分子的平移动力学差异。

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