The rheological properties of coal bitumens modified by polyesters. Rapid Communication (in English)
Polimery 2015, No 2, 144
The purpose of testing was to find changes of rheological properties of coal-tar pitch (CTP) due to modification with chosen polyesters. Poly(ethylene terephthalate) (PET), unsaturated polyester resin (UP) and polycarbonate (PC) were selected for testing. Polymers, in the amounts of 10 and 25 wt %, were mixed with CTP under conditions considered optimal for each modifier type. Properties of CTP-polymer compositions were assessed based on their softening point, content of components insoluble in toluene and quinoline and on rheological properties. Distinct changes of rheological properties, especially changes in viscosity versus shear rate and temperature, as well as viscoelastic properties were observed as results of modifications with all used polyesters. The modification effects became more intensive with increasing amount of the modifier added to CTP.