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Synthesis and 500 MHz-NMR characterization of poly(2-trimethylsiloxy)butadiene obtained by free radical and cationic polymerizations

✍ Scribed by J. Penelle; V. Mayné; C. Wynants

Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
389 KB
Volume
30
Category
Article
ISSN
0014-3057

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✦ Synopsis

2-(Trimethylsiloxy)butadiene was polymerized in the presence of AIBN, using different conditions of dilution and temperature. The resulting polymer was characterized by ~H-and ~3C-NMR: in particular, DEPT and ~H-~sC correlation spectra allowed to assign the different microstructures with high confidence. Cisand trans-1,4-microstructures and 3,4-microstructure were observed in all cases, but 1, 2-microstructure was never detected. The evolution of microstructure ratios with temperature was found to differ from the evolution described for other 2-substituted butadienes. Molecular weights determined by GPC are low to moderate in all cases (Mn < 104) decreasing with increasing temperature. Attempts to polymerize the monomer in the presence of cationic initiators failed to give a polymer, except when SnCI 4 was used.

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