Jonas Alves Fernandes

Synthesis of Oligothiophene-Layered Polymers

Polymers with layered π-electron systems comprising bithiophenes and quaterthiophenes based on a xanthene skeleton have been synthesized by an iron-catalyzed oxidative coupling reaction. The polymers are well soluble in common organic solvents, and polymer thin films are readily obtained by a spin-coating or casting technique. The synthesized polymers exhibit good thermal stability, and their 10% weight loss temperatures are approximately 400 °C. These behaviors of the polymers suggest that they can be used as opto-electronic devices such as hole-transporting materials.

The use of crude tall oil as feed-stock for alkyd resins

Abstract The synthesis of modified alkyd resins using a crude tall oil with a content of rosin acids of 39.8 % is described. This material has the composition of fatty acids close to soybean oil, has low cost and is widely available being a forest product industrial residue. The synthetic route includes the reaction of tall oil and maleic anhydride, in the presence of the catalyst (LiOH), followed by polyesterification reaction steps, resulting in an alkyd resin with interesting properties. The acid value (AN) and viscosity were used to follow the reaction, and it appears to be dependent upon the polyalcohol used in the polyesterification step. A period of 15 hours was needed to yield a tack-free coating.