Thermal Properties of the Homologous Series of 8-fold Alkyl-Substituted Octasilsesquioxanes

摘要: The homologous series of 8-fold alkyl-substituted octasilsesquioxane has been prepared by hydrosilation alkenes with octakis(hydridosilsesquioxane) (HSiO3/2)8. Ethene, propene, 1-butene, 1-pentene, 1-hexene, 1-heptene, 1-octene, 1-nonene, and 1-decene were employed either in bulk or toluene solution. 1,3,5,7,9,11,13,15-octaalkylpentacyclo[9.5.1.13,9.15,15.17,13]octasiloxanes, which are interesting model compounds for silsesquioxane-based materials was characterized 1H, 13C, 29Si NMR spectroscopy, IR mass elemental analysis. Melting points the studied DSC, revealing a strong decrease melting point from octapropyl-substituted T8 to octapentyl derivative. derivatives longer n-alkyl chains showed an odd−even effect. TGA evidenced thermal stability under nitrogen up temperatures between 200 400 °C air 250 °C.