Colloid and polymer science vol:282 issue:4 pages:373-380
The effect of solely intermolecular interactions due to hydrophobic alkyl substituents on the flow behaviour of hmHEC solutions was determined via comparison of the structure-property relationships of hmHECs and HECs based on the overlap parameter c[eta]. For this purpose the eta(0)-[eta]-c relationship for HEC was determined to be eta(0)=8.91.10(-4)+8.91.10(-4).c[eta]+1.07.10(-3)(c[eta])(2)+1.83.10(-7)(c[eta])(5.56). In addition the structure-property relationship for the longest relaxation time via the lambda-[eta]-c relationship lambda.c(1+1/a)=2.65.10(-8)(c[eta])(2)+4.25.10(-8)(c[eta])(3)+5.44.10(-12)(c[eta])(5.27) has been determined. Although the hmHECs had a higher zero shear viscosity than HECs of comparable overlap parameters at a range of 1<c[eta]<13, the flow curves could be described via the same lambda-[eta]-c relationship in that range, indicating a timescale of the intermolecular interactions below the longest relaxation time.