NMR Measurement of Identical Polymer Samples by Round Robin Method II. Reliability of Spin-Lattice Relaxation Time and Nuclear Overhauser Enhancement Factor

@article{Chj1988NMRMO,
  title={NMR Measurement of Identical Polymer Samples by Round Robin Method II. Reliability of Spin-Lattice Relaxation Time and Nuclear Overhauser Enhancement Factor},
  author={Riichirǒ Chǔjǒ and Koichi Hatada and Ryozo Kitamaru and Tatsuki Kitayama and Hirohiko Sato and Yasuyuki Tanaka and Fumitaka Horii and Yoshio Terawaki},
  journal={Polymer Journal},
  year={1988},
  volume={20},
  pages={627-638}
}
Abstract1H and 13C NMR spin-lattice relaxation times (T1) and 13C nuclear Overhauser enhancement (NOE) of radically prepared poly(methyl methacrylate) (Mn=28500) in CDCl3 were measured on 27 NMR spectrometers. Frequency range covered between 60 and 500 MHz for 1H NMR. Precision of 1H-T1’s of α-CH3 and CH2 protons was less than 5%. The 1H-T1’s of all sorts of protons increased linearly with increasing resonance frequency. The standard deviations for 13C-T1’s were larger than those for 1H-T1’s… CONTINUE READING