Molecular motion of the main chain for a series of Poly(alkyl l-glutamate)s as studied by 2H NMR |
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| Affiliation: | 1. Department of Chemistry, Gunma University, 1-5-1 Tenjin-cho, Kiryu, Gunma 376-8515, Japan;2. Department of Industrial Chemistry, Tokyo Institute of Polytechnics, 1583 Iiyama Atsugi, Kanagawa 243-0297, Japan;1. State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, 100029, PR China;2. Changzhou Paint and Coatings Industry Institute, China National offshore Oil Corporation, 213000, PR China;3. Changzhou Institute of Advanced Materials, Beijing University of Chemical Technology, Changzhou, Jiangsu, 213164, PR China;1. Department of Analytical Chemistry, Faculty of Chemistry, Razi University, Kermanshah, Iran;2. Department of Chemistry, Tarbiat Modares University, Tehran, Iran;3. Faculty of Chemistry, Institute for Advanced Studies in Basic Sciences, Zanjan, Iran;1. Department of Chemical and Biomolecular Engineering, University of California, Berkeley, CA 94720, USA;2. Energy Biosciences Institute, University of California, Berkeley, CA 94704, USA;3. Materials Sciences Division, Lawrrence Berkeley National Laboratory, Berkeley, CA 94720, USA |
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| Abstract: | 2H NMR measurements were carried out for a series of poly(alkyl l-glutamate)s (PALG) in which the 1H of the amide group in the main chain is replaced by 2H in order to investigate the mobility and motional mode of the main chain. At low temperature, the 2H spectra were typical powder patterns, which have three principal values. The temperature dependencies for the 2H NMR spectra varied with the side chain length. For PALG with a short side chain length, Δv1, Δv2, and Δv3 are almost constant in all temperature ranges. As the side chain length increases, the difference between the peaks and shoulders decreased with temperature. For PG-12-N-D, the peaks and shoulders are fused at high temperature in a liquid crystalline state. The mobility and molecular motion of the main chain is discussed based on the obtained 2H NMR spectra. |
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