Proton Magnetic Resonance Absorption in Ethyl Stearate

The proton magnetic resonance absorption in ethyl stearate has been investigated at −77, 0, and 24 °C in the solid β-phase and at 28 °C in the solid α-phase. Spin-lattice proton magnetic resonance relaxation times were measured in the liquid up to 75 °C and in the solid α-phase. The results suggest that the α-phase is composed partly of molecules in a liquid-like state and partly of molecules constrained to rotate about their longitudinal axes. The results also support the proposal that the dielectric dispersion observed in the β-phase is due to molecular motion in crystal defects.