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Owing to its low-cost maintenance and easy adaptability, low-field NMR (LF-NMR), which is developed based on permanent magnets, has attracted increasing attention in recent decades. It shows great potential for fundamental research as well as quality assessment and control in the industry. In this review, we first present the key hardware features of LF-NMR, including magnets, radiofrequency (RF) coils, spectrometers, and hyphenated units. Subsequently, commonly used pulse sequences and basic theoretical treatments are summarized. The applications of LF-NMR in polymer science are discussed in detail, including chain dynamics, polymer networks, and hierarchical morphologies. The multiphase and multicomponent features of polymers make polymer science a suitable area for developing new LF-NMR techniques. A personal perspective on the further development of LF-NMR is also presented.
Chen et al. (2025) studied this question.