Abstract
Proton rotating frame spin-lattice relaxation time ( T 1 ρ ) measurements have been made in 10 samples of pitch from room temperature to 673 K to obtain information about the mechanisms of pitch softening. The T 1 ρ minimum of pitch was found to occur at approximately the same temperature as the softening point. This result suggests that the softening phenomenon of pitch can be detected at the molecular level by T 1 ρ measurements. Laboratory frame spin-lattice relaxation time ( T 1) measurements were also made on pitches to obtain information about the molecular motion of pitch in the high frequency ranges.
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