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"Mechanism of Photostabilization of Perfluoropolyether Coatings by Hindered Amine Stabilisers " Polymer Degradation and Stability

Articolo
Data di Pubblicazione:
2001
Abstract:
Perfluoropolyethers show promising properties for coil coating application and a suitable layer is obtained by incorporating them in a crosslinked polyurethane network. However, photo-oxidative stability of urethane linkages is intrinsically low and an appropriate stabiliser must be added to the reactants prior to curing. The N-methyl HASbis(1,2,2,6,6-pentamethyl-4-piperidyl) sebacate (Tinuvin765) has been selected for this model study. The chemical structure of the network strongly depends on the curing conditions: coil coating conditions (280 C/1 min in air) lead to a polyurethane network also containing some urea-bridges and unreacted isocyanate. HASfurther modifies the network increasing the urea-bridges at the expenses of the unreacted isocyanate. This kind of network is shown to be intrinsically more resistant to the photo-oxidation than pure polyurethane. In curing conditions the Nmethyl HASis partially transformed into –NH derivatives which are still active antioxidants. During photo-oxidation HAS acts as a radical scavenger but slowly evaporates from the film.
Tipologia CRIS:
03A-Articolo su Rivista
Keywords:
Perfluoropolyether derivatives; Fluorinated polyurethane; Photo-oxidation; HAS stabiliser
Elenco autori:
M.P. Luda; G. Camino; E. Laurenti; S. Novelli; T. Temtchenko; S. Turri
Autori di Ateneo:
LAURENTI Enzo
Link alla scheda completa:
https://iris.unito.it/handle/2318/102494
Pubblicato in:
POLYMER DEGRADATION AND STABILITY
Journal
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