Structural recombination of polymethylsilicone induced by laser plasma

A special synthetic reaction has been developed, in which vapor of the reac tant interacts with the high temperature plasma generated by laser ablating a graphite target. By selecting chained methylsilicone as reactant, a seri es of methylsilsesquioxanes products with various structural configurations have been obtained. Among them, two products, which were separated by subl imation in high vacuum and recrystalization, were characterized by X - ray crystal diffraction as (CH3SiO1.5)(n)(n = 8, 10). Both of them are found to have three - dimensional cage structure. In addition, other products with double ring structure were detected by GC - MS analysis. The results demons trate the potential application of the synthetic reaction. In the reaction described in this article, resulting from the collision and energy - transf er of the laser plasma, chain structure of the reactant dissociated and rec ombined to give the cage and ring structure of the products.