our 13- arm star branched polystyrene samples differing in molecular weighthave been prepared and were determined by GPC combined viscometry. The fadtor in condition is obtained from viscosity data in good solVent by way of linear extrapolation. The difference between the factorpo factor as well as the selechon ofε - value in relationship between andis discused
' and wore compared with results for 4- armand 7 -any star' brarehed polystyrene