We review past and recent work carried out on viscous liquids, amorphous and semicrystalline polymers by multifrequency high-field electron paramagnetic resonance (HF-EPR) facility in Pisa. The emphasis is on the enhanced ability to provide fine details of the reorientation process of the paramagnetic guest, the spin probe, revealing features driving the dynamics of the host system, including the energy-barrier distribution of glassy polymers, the dynamical heterogeneity of semicrystalline polymers, and the dynamical changes occurring at the critical temperature predicted by the ideal mode-coupling theory.

中文翻译：

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玻璃形成液体、无定形和半结晶聚合物：通过多频高场 EPR 探索它们的能量景观和动力学异质性

我们回顾了过去和最近通过比萨多频高场电子顺磁共振 (HF-EPR) 设施对粘性液体、无定形和半结晶聚合物进行的工作。重点是增强提供顺磁客体重新定向过程的精细细节的能力，自旋探针，揭示驱动主体系统动力学的特征，包括玻璃状聚合物的能量势垒分布，半结晶聚合物的动态异质性，以及在理想模式耦合理论预测的临界温度下发生的动力学变化。