Etude structurale du poly (pentadiene-1,3) par RMN du proton a 100 ET 220 MHz |
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| Authors: | P Aubert J Sledz F Schué J Prud &#x;homme |
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| Institution: | 1. Laboratoire de Chimie Macromoléculaire, Université des Sciences et Techniques du Languedoc, Place E. Bataillon, 34060 Montpellier Cedex, France;2. Département de Chimie, Université de Montréal, C.P. 6128, Montréal, Quebec, Canada |
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| Abstract: | High-resolution proton NMR spectra of C6D6 solutions of samples of poly(1,3-pentadiene) having different structures and different stereoregularities are presented and interpreted. Methylene resonances of isotactic and syndiotactic cis-1,4-polypentadienes measured at 220 MHz exhibit three-peak and eight-peak patterns, respectively, indicating that the methylene protons are non-equivalent in the syndiotactic polymer. Methyl groups of cis-1,4 units are about 0.02 ppm more shielded than those of trans-1,4 units. Spectra of trans-1,2-polypentadiene and spectra of polypentadiene prepared with lithiumnaphthalene in tetrahydrofuran are also interpreted. |
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