Fig.1 GPC-MALLS chromatograms of PEO448000 at a flow rate of 1.0 mL/min^The lines are Rayleigh ratios Rθ from the MALLS detector of 11 angles between 34.8° and 142.6°(from top to bottom is in the order of increasing angle).

Fig.2 Weight-averaged molecular weight Mw,i(A) and Z-averaged radius of gyration Rgz,i(B) of GPC fractions as functions of elution volume for PEO448000^The solid lines are polymer concentrationof GPC fractions as calculated from the refractive index detector signals, while the dashed lines are the LS signals at scattering angle of 90°.

Fig.3 Monodisperse calibration relation lnM of the GPC columns and the experimental relation lnMw of individual PEG/PEO samples^The monodisperse calibration relation lnM-V is showed as a long straight line, which is obtained by linear fit to the cross points [Vw, M(Vw)](solid circles). The experimental relations lnMw-V of PEG3900, PEG12000, PEO45000, PEO293000, and PEO1358000 are shown as short straight lines, which are obtained by linear fits to the GPC-MALLS data(open squares), and the corresponding cross points are encircled.

Fig.4 Dependence of the spreading factor σ02 on the molecular weight Mw of PEG/PEO samples^The straight line is a linear fit of σ02 on lgMw for all samples except PEO1000000.

Fig.5 Rgz as a function of Mw for PEO in water^PEO samples with narrow molecular weight distribution(solid squares); GPC fractions of PEO1000000(open circles); Devanand and Selser[15](upward-pointing triangles); Kawagichi et al.[16](downward-pointing triangles). The straight line indicates Rg,z=0.0272Mw0.56, while the dashed and short dashed lines are Rgz=0.0215Mw0.583 established in ref.[15] and Rgz=0.0202Mw0.580 obtained in ref.[16], respectively.