New PDF release: NMR Spectra of Polymers and Polymer Additives

By Anita J. Brandolini

"Compiles approximately four hundred totally assigned NMR spectra of roughly three hundred polymers and polymer ingredients, representing all significant clases of fabrics: polyolefins, styrenics, acrylates, methacrylates, vinyl polymers, elastomers, polyethers, polyesters, polymides, silicones, cellulosics, polyurethanes, plasticizers, and antioxidants."

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It is often the more subtle details of molecular structure, not simply the chemical classification or even the molecular weight, that ultimately account for a material's bulk properties. 95 g/cm3). In fact, branched PE is commonly called low-density polyethylene (LDPE); the linear form, high-density polyethylene (HDPE). Some polymer structures can exhibit either geometric or stereoisomerism, which also affects polymer properties. K High-cis and high-trans content PBd are strikingly different materials.

Page 18 13C peak multiplicities without overly complicating the spectrum. Adjustment of the decoupling frequency can reduce the magnitude of the splitting, and other approaches, such as DEPT, INEPT, and APT, have been devised which selectively invert or null particular multiplicities [47]. 4 Nuclear Relaxation The behavior of nuclei during the pulsed, or Fourier-transform, NMR experiment is time-dependent. The equilibrium magnetization is perturbed by the radiofrequency excitation pulse used. After the pulse, relaxation occurs by various processes, each of which is governed by a characteristic relaxation time.

Page 22 21. J. L. Koenig. Spectroscopy of Polymers Washington, DC: American Chemical Society, 1992. 22. J. C. Randall, ed. NMR and Macromolecules: Sequence, Dynamics, and Domain Structure. Washington, DC: American Chemical Society, 1984. 23. H. N. Cheng and T. A. Early. Macromol. Symp. 86:117129, 1994; and following articles. 24. P. J. Nelson. unpublished results. 25. A. J. Brandolini, J. M. Garcia, and R. E. Truitt. Spectroscopy 7:3439, 1992. 26. H. N. Cheng. J. Chem. Inf. Comput. Sci. 23:197, 1983.

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