New structures from the thermal rearrangement of polybutadiene revealed by 2D HSQC NMR

Nguyen Q. Hung (1, 2) , Corinne Sanglar (2) , Marie-Florence Grenier-Loustalot (2) , Pham V. Huong (3) , Hoang N. Cuong (4)

1 Center of Analysis Services and Experimentation
2 ISA - Institut des Sciences Analytiques
3 ISM - Institut des Sciences Moléculaires
4 University of Natural Sciences

The thermal reactions of polybutadiene (PB) at 260 °C in inert atmosphere were followed by 1H and 13C NMR spectroscopy. Within 24 h of heating, the change in the intensities of some peaks and the appearance of new peaks of NMR spectra permits to follow the reactions occurring in polybutadiene. The sample, after heating for 6 h, was then characterized by a two dimensional HSQC NMR spectrum, showing the appearance of CH3CH moiety, and the migration of double bond in polybutadiene. From these results the new mechanism of intra/intermolecular reactions was proposed.

Mots clés: Polybutadiene; Thermal rearrangement reaction; Double bond migration; Ene rearrangement; HSQC NMR spectroscopy

Domaines: Chimie analytique

Nguyen Q. Hung, Corinne Sanglar, Marie-Florence Grenier-Loustalot, Pham V. Huong, Hoang N. Cuong. New structures from the thermal rearrangement of polybutadiene revealed by 2D HSQC NMR. Polymer Degradation and Stability, 2011, 96 (7), pp.1255-1260. ⟨10.1016/j.polymdegradstab.2011.04.008⟩. ⟨hal-00616347⟩