High performance polyurethane dispersion synthesized from plant oil renewable resources : a challenge in the green materials

A series of hyperbranched polyesters were incorporated by the chemical reaction of the dimethylolpropionic acid with trimethylolpropane, pentaerythritol, and glycerol as the core group. The castor oil-based fatty acids were also successfully prepared in order to examine the impact of the biopolyols on the thermo-mechanical characteristics of the hyperbranched waterborne polyurethane. The chemical structure of the polyols and the resulting polymer were characterized. Developing −OH functionality of the polyols the polyurethanes represented an improvement in crosslinking density, leading to increasing Tg, tensile modulus, and tensile strength and a decrease in elongation and toughness. Thus, the overall results forward the synthesized HBWPU as a potent sustainable and eco-friendly polymeric material by a simple approach that possesses a higher degree of sustainability over a purely petrochemical route

Electrochemical and X-ray photoelectron spectroscopic investigations of conductive polymers

We report the synthesis of high soluble poly(aniline-co-o-hydroxyaniline) copolymers with varying the amount of o-hydroxyaniline (20, 40, 60, and 80 %) and referred as PA-co-o-HA20, PA-co-o-HA40, PA-co-o-HA60, and PA-co-o-HA80 respectively. The chemical and structural composition of the polymers and copolymers were determined by XPS, UV–Vis, and FE-SEM analysis. Electrochemical studies of the as-prepared polymers showed two single-electron oxidations and two single-electron reductions reversibly at various scan rates ranging from 20 to 50 mV and results reveals that the current density of the copolymer was lesser than the conventional polyaniline (PA). This is due to increasing the hydroxyl (-OH) branching on the polymer backbone in the polymer chain. The current density decreases from PA-co-o-HA20 to PA-co-o-HA80 by increasing the weight percentage of o-hydroxyaniline in the polymeric backbone.This work was funded by Qatar University

2. starptautiska zinatniski praktiska konference "Vide. Tehnologija. Resursi" Konferences materiali

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