Abstract
Crosslinked polyurethanes were obtained when trifunctional –OH group containing castor oil was reacted with difunctional toluene-2,4-diisocyanate under different stoichiometric conditions varying NCO/OH ratio. These polyurethanes swelled in n-butyl acrylate monomer and subsequently polymerized by radical polymerization initiated with benzoyl peroxide in presence of crosslinking agent ethylene glycol dimethacrylate. A series of interpenetrating networks, PU/PnBA IPNs, were obtained as tough films by transfer moulding. All these IPNs films were characterized by resistance to chemical reagents, thermal behavior (DSC, TG), and mechanical studies such as tensile strength, Young’s modulus, elongation at break (%) and hardness shore A. The mechanothermal (DMA) and morphological (SEM) behavior were studied. Dielectric properties such as electrical conductivity, dielectric constant (e′), dielectric loss (e″), and dielectric loss tangent (tanδ) were estimated.
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