Studies On The Synthesis And Reaction Of Silicone Anhydride Dendrimers And Thermal Properties Of Their Imides

Abstract Dendritic silicone core polyimides have been synthesized using silicone anhydride dendrimers which inturn were synthesized by the hydrosilation reaction of maleic anhydride with Si-H terminated silicone dendrimers in presence of Speiers catalyst. The anhydride groups were converted to imide functionality by the reaction of aromatic diamines at elevated temperatures. All the products were characterized by usual physico-chemical method i.e. elemental analysis FT-IR and 1H- NMR spectroscopy. The molecular weights of dendrimers were determined by using vapor pressure osmometry. The dendritic polyimides have shown fairly good solubility in polar aprotic solvents e.g. N N-dimethylacetamide DMAc N N-dimethylformamide DMF N methyl-2 pyrrolidone NMP etc. Thermal studies TGA 26 DSC of these compounds have also been studied under inert atmosphere which have shown high char yield 65 at 800 C and thermal stability above 400 C. The glass transition temperature of these imides was found in the range of 170-190 C.