Nuclear Magnetic Resonance Studies of Molecular Motion in Natural Rubber
Keyword(s):
Abstract Nuclear magnetic resonance measurements have been made on natural rubber to examine how frequency, temperature, and crystallinity affect the nuclear relaxation. Moecular motions were studied by observing NMR linewidths and spin-lattice relaxation times at temperatures between −100° and 100° C, and at radio frequencies between 2 and 60 Mc. The effect of crystallinity was seen in measurements on stark rubber. The relation between frequency and temperature in the spin-lattice relaxation process is examined in terms of the Arrhenius equation and the WLF expression. The importance of using frequency as a variable in NMR studies of molecular motion is stressed.
1954 ◽
Vol 222
(1151)
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pp. 526-541
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1986 ◽
Vol 24
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pp. 872-874
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1975 ◽
Vol 97
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pp. 3573-3578
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1973 ◽
pp. 893-894
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1974 ◽
Vol 78
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pp. 1971-1977
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1973 ◽
Vol 12
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pp. 5-14
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1976 ◽
Vol 14
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pp. 253-256
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1984 ◽
Vol 80
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pp. 375-382
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