Variable-temperature study of a gel-spun ultra-high molecular-mass polyethylene fiber by solid state NMR |
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| Authors: | Jinlong Cheng Matilda Fone Yigang Fu Wei Chen |
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| Affiliation: | (1) Raychem Corporation, 300 Constitution Drive, 94025 Menlo Park, CA;(2) Department of Chemistry, University of Tennessee, 37996 Knoxville, TN, USA |
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| Abstract: | Solid-state13C nuclear magnetic resonance (13C NMR) methods have been applied to study a gel-spun ultra-high molecular-mass polyethylene fiber. The mass fractions of the crystalline (orthorhombic and monoclinic), intermediate, and amorphous phases have been determined at temperatures between 296 and 413 K. The mobility of the polymer chains in the crystalline and the intermediate phases have been measured within the same temperature range, 296–413 K. Discussions on the chain conformation and the rate of motion are carried out based on the13C chemical shift and spin-lattice relaxation time, respectively.Dedicated to Professor Bernhard Wunderlich on the occasion of his 65th birthday |
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| Keywords: | chain motion and conformation mass fractions polyethylene fiber variable-temperature solid-state NMR |
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