The dynamic behaviour of polyacrylonitrile solution in dimethylformamide was investigated in presence of water as non-solvent. At low temperatures, the gelation becomes faster in presence of a small content of water (up to 3%). The sol-gel transition was investigated at C in function of water concentration through the evolution of the viscoelastic parameters as a function of time. The frequency sweep tests evidenced different behaviours in the

Polysiloxane-g-(styrene-co-butyl acrylate) copolymers with different architectures (four-armed star and brush) were synthesized and introduced into an alkydic resin in order to improve the flow properties and formulate new systems for painting applications. The viscoelastic properties of the alkydic resin as compared with the additives samples were investigated at different temperatures in the range of 0◦C to 80◦C. The experimental data showed