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Studies On The Synthesis And Reaction Of Silicone Anhydride Dendrimers And Thermal Properties Of Their Imides
[Full Text]
AUTHOR(S)
Sangeeta Kandpal, A. K. Saxena
KEYWORDS
KEYWORDS: dendrimers; hydrosilation; Speier’s catalyst; imidization; T.G.A.
ABSTRACT
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 Speier’s 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 & DSC) of these compounds have also been studied under inert atmosphere which have shown high char yield (~ 65% at 800 ºC) and thermal stability above 400 ºC. The glass transition temperature of these imides was found in the range of 170-190 ºC.
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