Fluorinated Hydroxytelechelic Polybutadiene as Additive in Cationic Photopolymerization of an Epoxy Resin

Bruno Ameduri (1) , Roberta Bongiovanni (2) , Marco Sangermano (2) , Aldo Priola (2)

1 ICGM ICMMM - Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier
2 DIpartimento di Scienza dei Materiali e Ingegneria Chimica

Fluorinated hydroxytelechelic polybutadiene (PBF), which is synthesized from the radical addition of a fluorinated mercaptan onto a hydroxytelechelic polybutadiene was used as an efficient surface and mechanical modifier in original formulations to enable the UV cationic polymerization of a telechelic diepoxy cycloaliphatic resin, leading to crosslinked films. Various amounts of PBF were used (ranging between 0 and 15 wt %). The kinetics of photocrosslinking revealed that the diepoxyde conversion reached 70% only in the absence of PBF, whereas it was about 90% in the presence of 10 wt % of PBF. When the PBF content increased, the dynamic mechanical measurements showed that: (i) the glass transition temperature values decreased and (ii) the resilience increased. The hydrophobicity of these films was investigated from the water contact angle (WCA) values showing a surface modification of the poxy-based system. Indeed, great modifications were noted on the extreme surface (i.e., air side) of the films (with WCA values as high as 120°) in contrast to those observed on the substrate side.

Mots clés: crosslinking; fluoropolymers; morphology; photopolymerization; polybutadiene; surface modification

Domaines: Polymères

Bruno Ameduri, Roberta Bongiovanni, Marco Sangermano, Aldo Priola. Fluorinated Hydroxytelechelic Polybutadiene as Additive in Cationic Photopolymerization of an Epoxy Resin. Journal of Polymer Science Part A: Polymer Chemistry, 2009, 47, pp.2838-2842. ⟨10.1002/pola.23376⟩. ⟨hal-00379289⟩