A study is reported, dealing with the microstructure and thermal behavior of the homopolymers of 1,1,1,3,3,3-hexafluoroisopropyl methacrylate (HFIM) and 1, 1,1,3,3,3-hexafluoroisopropyl alpha -fluoroacrylate (HFIFA), as well as of their copolymers with various vinyl ethers. The aim of this work was a better understanding of the role that fluorine content and distribution-first in the monomer and then along the ensuring macromolecular chain-play in determining the polymerizability of the selected vinyl monomers, and the final properties of the polymeric material. Primary (n-butyl, isobutyl, 2-ethylhexyl), secondary (cyclohexyl), and tertiary (tert-butyl) vinyl ethers were employed as the comonomers. A general tendency towards comonomer alternation was observed upon radical initiated copolymerization with HFIFA. On the other hand, the relatively more electron-rich HFIM did not usually yield strictly alternating sequences, unless the bulky tert-butyl vinyl ether was employed. The incorporation of electron-rich vinyl ether monomers within a partially fluorinated polymeric chain by simple radical initiated process was considered particularly interesting in view of the possible application of these materials as water-repellent protective coatings. In this case, the fluorinated units should provide the low energy surface (water repellency) and, possibly, photo- and thermostability, whereas the vinyl ether counits should grant improved adhesion and adequate film-forming properties.
Homo- and copolymers of hexafluoisopropyl methacrylate and alfa-fluoacrylate with alkyl vivyl ethers: microstructure and thermal properties
CASTELVETRO, VALTER;AGLIETTO, MAURO;
2001-01-01
Abstract
A study is reported, dealing with the microstructure and thermal behavior of the homopolymers of 1,1,1,3,3,3-hexafluoroisopropyl methacrylate (HFIM) and 1, 1,1,3,3,3-hexafluoroisopropyl alpha -fluoroacrylate (HFIFA), as well as of their copolymers with various vinyl ethers. The aim of this work was a better understanding of the role that fluorine content and distribution-first in the monomer and then along the ensuring macromolecular chain-play in determining the polymerizability of the selected vinyl monomers, and the final properties of the polymeric material. Primary (n-butyl, isobutyl, 2-ethylhexyl), secondary (cyclohexyl), and tertiary (tert-butyl) vinyl ethers were employed as the comonomers. A general tendency towards comonomer alternation was observed upon radical initiated copolymerization with HFIFA. On the other hand, the relatively more electron-rich HFIM did not usually yield strictly alternating sequences, unless the bulky tert-butyl vinyl ether was employed. The incorporation of electron-rich vinyl ether monomers within a partially fluorinated polymeric chain by simple radical initiated process was considered particularly interesting in view of the possible application of these materials as water-repellent protective coatings. In this case, the fluorinated units should provide the low energy surface (water repellency) and, possibly, photo- and thermostability, whereas the vinyl ether counits should grant improved adhesion and adequate film-forming properties.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
