Light scattering characterization of poly(tetrafluoroethylene-co-perfluoromethyl vinyl ether) copolymer

✍ Scribed by S.-Q. Zhou; Q. Wan; D.-H. Liang; B. Chu; P. Xu; J. Lai

• Publisher: John Wiley and Sons
• Year: 2000
• Tongue: English
• Weight: 169 KB
• Volume: 77
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/(sici)1097-4628(20000725)77:4<733::aid-app3>3.0.co;2-k

✦ Synopsis

Static and dynamic light scattering experiments were performed to characterize the copolymer of tetrafluoroethylene (TFE) and perfluoromethyl vinyl ether (PMVE). Solvents of perfluoro-2-butyltetrahydrofuran (FC-75) and Flutec PP11 (PP11) were used to dissolve the TFE-PMVE copolymer. By taking advantage of the solvent properties of FC-75 and PP11, homogeneous TFE-PMVE copolymer solutions were specially prepared in a FC-75/PP11 mixed solvent. Such prepared solutions could provide a strong enough scattered intensity for light scattering studies. The molecular weight, molecular weight distribution, chain dimensions, and conformation were determined for the TFE-PMVE copolymer in the FC-75/PP11 mixed solvent. A combination of viscosity and molecular weight measurements enabled the calculation of the k value in the relation of 0 ϭ k (M w ) 3.4 and thus the prediction of the molecular weight of a given TFE-PMVE copolymer with the same composition by using only the simpler and more readily available rheological measurements.