Chemistry Reference
In-Depth Information
Figure 1.26
(a) Photo-DSC profiles for ESO-ATX-DBA, ESO-ATX/ESO-DBA, ETX-DBA
and ETX/EDB, inset picture: dispersion of the four photo-initiators
in A-BPE-10. (b) Conversion versus time curves for the polymerization
of A-BPE-10 initiated by ESO-ATX-DBA, ESO-ATX/ESO-DBA, ETX-DBA
and ETX/EDB, cured at 25 1C by UV light with an intensity of
45 mW cm
2
(all photo-initiator concentrations were 0.06 M wrt the
TX moiety).
We synthesized a series of photo-initiators based on vegetable oil by
introducing TX and co-initiator dimethylaminobenzene moieties into the
ESO backbone through the reaction between carboxyl and epoxy groups
(Figure 1.25). The obtained photo-initiators based on ESO exhibited high
photo-eciency in the photo-polymerization of acrylate monomers and low
migration (Figure 1.26).
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1.6 Conclusions
Modifying vegetable oils can lead to new materials through a photo-poly-
merization process. The raw vegetable oils can be easily modified to obtain
UV-curing monomers. Otherwise, modified vegetable-oil-based monomers
can be introduced into polymeric materials to obtain specific properties, or
form the basis of the polymers themselves. Consequently, photo-cured ma-
terials based on modified vegetable oils have a large variety of applications
such as coatings, inks, bio-materials and so on.
Radiation-curing technology has developed very rapidly in recent years
due to some obvious advantages. However, this technology retains
some problems yet to be solved, such as the oxygen inhibition of radical
polymerization, migration of photo-initiators and the low mechanical per-
formance of the resulting materials. The development of non-hazardous
photo-initiators which can be used safely in medicinal applications and in
food contact coatings is a new opportunity. For industrial applications, new
trends in the future will concern the development of ultrafast reactive
monomers with low toxicity.
