Proton spin-lattice relaxation in MBDBP |
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| Authors: | Meigan Aronson Peter Beckmann Victoria Guerra Cheryl Schwamb Swee Lian Tan |
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| Affiliation: | 1. Department of Physics , Bryn Mawr College , Bryn Mawr , Pennsylvania , 19010 , U.S.A.;2. Western Electric , 555 Union Boulevard, Allentown , Pennsylvania , 18103 , U.S.A.;3. Department of Physics , Bryn Mawr College , Bryn Mawr , Pennsylvania , 19010 , U.S.A.;4. Department of Material Science and Engineering , University of Pennsylvania , Philadelphia , Pennsylvania , 19104 , U.S.A.;5. University Information Processing, University of Southern California , Los Angeles , California , 90007 , U.S.A. |
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| Abstract: | We have measured the proton spin-lattice relaxation rate R in 4,4′-methylenebis(2,6-di-t-butylphenol) (MBDBP) and MBDBP-OD (deuteriated hydroxyl proton) between 88 K and 380 K. The experimental results are compared with those from a previous study in the closely related but simpler molecule 4-methyl-2,6-di-t-butylphenol (MDBP). The present experiment is analysed in terms of relaxation resulting from intramolecular reorientation modulation of the proton spin-spin interaction. This intramolecular reorientation involves different combinations of superpositions of methyl, t-butyl, aromatic ring and hydroxyl group reorientation and a discussion is presented concerning the effects on the relaxation of superimposing these motions. The MBDBP-OD data is best fitted with the assumption that only methyl and aromatic ring reorientations occur. In MBDBP it is found that, in addition, an OH flip-flop motion is superimposed on the aromatic ring reorientation. |
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