The 3 %, 6 %, 10 % and 12 % of copolymer hydrogenated poly (isoprene-co-styrene) solutions concentrations were studied in the temperature range 313 – 363 K, shear rates between 3 and 1312 s-1 viscometer Haake VT 550. Rheological model described the equation (3) describes the rheological behavior of the 3 %, 6 %, 10 % and 12 % solution of concentration at shear rates. A parameter is negative for all concentrations and shear velocities. Parameter B is positive at 6 %, 10 % and 12 % concentration solutions and 3 % solutions concentration negative. Correlation coefficients have values close to unity for all solutions.

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