DOI: 10.1063/1.1743764. Proton Magnetic Resonance Studies on Natural Rubber. II. Line Shape and <i>T</i>1 Measurements

Proton Magnetic Resonance Studies on Natural Rubber. II. Line Shape and T1 Measurements

10.1063/1.1743764

Crossref journal-article

AIP Publishing

The Journal of Chemical Physics (317)

Abstract

Proton magnetic resonance absorption measurements have been made on samples of uncured Hevea, balata, and Coral rubber as well as on vulcanized samples with up to 9% combined sulfur. The motions of the chain segments were studied by observing line shapes and spin-lattice relaxation times at temperatures between —190 and 150°C. Several types of data show different molecular mobilities for vulcanized samples with a given combined sulfur but prepared by curing mixes with different fractions of raw sulfur for different times. Line width studies of the uncured Hevea sample as a function of thermal history indicate that the molecular mobility decreases with increasing crystallinity. Chemical shifts were resolved in high resolution studies of solutions of uncured Hevea, balata, and Coral rubber. The T1 measurements, including observations at 20 and 28 Mc/sec on uncured Hevea and balata, exhibit systematic deviations from the BPP theory. The significance of the deviations is discussed.

Bibliography

Gutowsky, H. S., Saika, A., Takeda, M., & Woessner, D. E. (1957). Proton Magnetic Resonance Studies on Natural Rubber. II. Line Shape and T1 Measurements. The Journal of Chemical Physics, 27(2), 534â542.

Authors 4

H. S. Gutowsky (first)
A. Saika (additional)
M. Takeda (additional)
D. E. Woessner (additional)

References 27 Referenced 94

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Dates

Type	When
Created	20 years, 7 months ago (Jan. 5, 2005, 8:54 p.m.)
Deposited	1 year, 6 months ago (Feb. 8, 2024, 1:21 p.m.)
Indexed	2 months ago (July 2, 2025, 12:53 p.m.)
Issued	68 years, 1 month ago (Aug. 1, 1957)
Published	68 years, 1 month ago (Aug. 1, 1957)
Published Print	68 years, 1 month ago (Aug. 1, 1957)

Funders 0

None

BibTeX

@article{Gutowsky_1957, title={Proton Magnetic Resonance Studies on Natural Rubber. II. Line Shape and T1 Measurements}, volume={27}, ISSN={1089-7690}, url={http://dx.doi.org/10.1063/1.1743764}, DOI={10.1063/1.1743764}, number={2}, journal={The Journal of Chemical Physics}, publisher={AIP Publishing}, author={Gutowsky, H. S. and Saika, A. and Takeda, M. and Woessner, D. E.}, year={1957}, month=aug, pages={534–542} }

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