Fluorinated hydroxytelechelic polybutadiene as additive in cationic photopolymerization of an epoxy resin |
| |
Authors: | B Ameduri R Bongiovanni M Sangermano A Priola |
| |
Institution: | 1. Ingénierie et Architectures Macromoleculaires;2. Institut Charles Gerhardt, UMR (CNRS) 5253, Ecole Nationale Superieure de Chimie de Montpellier, 8, rue Ecole Normale F‐34296 Montpellier Cedex, France;3. Politecnico di Torino, Dipartimento di Scienza dei Materiali e Ingegneria Chimica, C.so Duca degli Abruzzi 24, 10129 Torino, Italy |
| |
Abstract: | 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 oligomer, leading to crosslinked polymers. 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 polymers was investigated from the water contact angle (WCA) values showing a surface modification of the epoxy‐based system. Indeed, great modifications were noted on the extreme surface (i.e., air side) of the polymers (with WCA values as high as 120°) in contrast to those observed on the substrate side. © 2009 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 47: 2835–2842, 2009 |
| |
Keywords: | crosslinking fluoropolymers morphology photopolymerization polybutadiene surface modification |
|
|