Static and dynamic light scattering experiments were performed to character
ize the copolymer of tetrafluoroethylene (TFE) and perfluoromethyl vinyl et
her (PMVE). Solvents of perfluoro-2-butyltetrahydrofuran (FC-75) and Flutec
PP11 (PP11) were used to dissolve the TFE-PMVE copolymer. By taking advant
age of the solvent properties of FC-75 and PP11, homogeneous TFE-PMVE copol
ymer solutions were specially prepared in a FC-75/PP11 mixed solvent. Such
prepared solutions could provide a strong enough scattered intensity for li
ght scattering studies. The molecular weight, molecular weight distribution
, chain dimensions, and conformation were determined for the TFE-PMVE copol
ymer in the FC-75/PP11 mixed solvent. A combination of viscosity and molecu
lar weight measurements enabled the calculation of the k value in the relat
ion of eta(o) = k (M-w)(3.4) and thus the prediction of the molecular weigh
t of a given TFE-PMVE copolymer with the same composition by using only the
simpler and more readily available rheological measurements. (C) 2000 John
Wiley & Sons, Inc.