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    Thermal and surface characteristics of some b-cyclodextrin-based side-chainazo amphiphilic polyurethanes

    Year: 2013

    Journal: Polymer Degradation and Stability, 98, pp 951-957, 20130926

    Authors: D. Filip, D. Macocinschi, L.M. Gradinaru

    Organizations: “Petru Poni” Institute of Macromolecular Chemistry, Aleea Gr. Ghica 41 A, 700487 Iasi, Romania

    New amphiphilic azo aromatic b-cyclodextrin poly(ether urethanes) with different soft segment lengthshave been synthesized and characterized. The thermal stability and kinetic parameters of the synthesizedpolyurethanes by using thermogravimetry (TG) and derivative thermogravimetry (DTG) underdynamic conditions of temperature, were evaluated. The non-isothermal kinetic parameters of thethermal degradation (activation energy, order of reaction, pre-exponential factor) were discussed interms of the integral methods: CoatseRedfern, FlynneWall, van Krevelen and UrbanovicieSegal. TheReicheLevi method was also employed in evaluation of variation of the kinetic parameters with conversion.Surface parameters were evaluated based on contact angle determinations. Surface-free energyvalues and the polar and dispersive components were obtained by applying the OwenseWendteRabeland the Kaelbe methods.