COLLOIDAL SCALE BLEND OF RIGID AND FLEXIBLE POLYAMIDES

A two step procedure was employed to prepare a colloidal scale, unifor m dispersion poly(p-aminobenzoic acid) (PAB) in Nylon 6(3)T. In the fi rst step, a colloidal suspension of PAB was prepared via direct polyco ndensation, starting from a concentrated solution of AB in dimethyl ac etamide (DMAc) containing suitable activators. In the second step, a s olution of Nylon 6(3)T in DMAc was mixed with the colloidal suspension . The composite powder was generated by precipitation in water and the composite film obtained by redispersing the powder in DMAc and castin g. The films contain PAB particles, below 100 nm in size, uniformly di stributed in the Nylon 6(3)T matrix. The mechanical properties and the thermal transitions of these composites were investigated.