Abstract

This chapter deals with the magnetic properties of polymers. The principal magnetic properties of polymers are the diamagnetic susceptibility and the magnetic resonance. The former is a property of the material as a whole; the latter is connected with magnetic moments of electrons and nuclei within the material. Only the diamagnetic susceptibility and the second moment of the nuclear magnetic resonance show additive molar properties. The chapter begins with a detailed description of magnetic susceptibility, also known as magnetic inductive capacity. Under this, it also explains additivity of the molar magnetic susceptibility. Following this, it deals with magnetic resonance. Magnetic resonance occurs when a material, placed in a static magnetic field, absorbs energy from a superimposed oscillating magnetic field, perpendicular to the static field, due to the presence of small magnetic elementary particles in the material. The nature of the absorption is connected with transitions between energy eigenstates of the magnetic dipoles. Magnetic resonance spectroscopy deals with the observation of the interaction between an oscillating magnetic field and matter, which results in transition between energy levels of the magnetic dipoles, the degeneracy of which is usually removed by an externally applied steady magnetic field. Finally, the chapter elucidates nuclear magnetic resonance spectroscopy and electron magnetic resonance.

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