Macromolecules, Vol.32, No.8, 2669-2674, 1999
Insights into the properties of novel trifluorovinyl ether copolymers
We have prepared new trifluorovinyl ether (TFVE) polymers and copolymers that have oligoether hydrocarbon pendant groups, providing facilitated processability and increased solubility in common organic solvents than commercially available fluoropolymers. In particular, we synthesized homo- and copolymers by a redox-initiated emulsion polymerization with 1-[2-(2-ethoxy-ethoxy)-ethoxy]-1,2,2-trifluoroethene (Et-TFVE) and 1-[2-(2-tertiary-butoxy-ethoxy)-ethoxy]-1,2,2-trifluoroethane (t-Bu-TFVE). The tert-butyl group is a protected alcohol, which, upon removal, provides a reactive handle for further modification after polymerization. The monomers, which appeared to have similar reactivity, controlled the copolymer composition. Polymers were prepared with M-w's as high as 40 000 and polydispersities from approximately 2 to 3. Poly(Et-TFVE) was more thermally stable than poly(t-Bu-TFVE) as determined by thermogravimetric analysis. The polymers had similar glass-transition temperatures (T-g's) Of approximately -60 degrees C; however, T-g increased with hydroxyl (i.e., TFVE-OH) content to +9 degrees C, as a result of hydrogen-bonding interactions. The hydroxyl functional groups of a TFVE-OH copolymer were modified with 1,6-hexamethylene diisocyanate to form a cross-linked polymer film, thereby demonstrating the potential utility of these functionalized polymers in coatings applications.