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Título:
Resins, Foams and Shape Memory Copolymers from Vegetable Oils and Oleochemicals
Autor/es:
F. ALTUNA; MEIORIN, C; D. MARIN; J.P. ESPINOSA; M. A. MOSIEWICKI; R.A. RUSECKAITE; M. I. ARANGUREN; P.M. STEFANI
Lugar:
Sitges
Reunión:
Simposio; Third International Symposium. Frontiers in Polymer Science; 2013
Resumen:
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The aim of this work is to present our current
work on vegetable oil - based resins, foams and shape memory copolymers.
Thermal, mechanical and optical properties of epoxy resins synthesized by the partial replacement of the
synthetic diglycidyl ether of bisphenol A (DGEBA) with increasing amounts of
epoxidized soybean oil (ESO) using a cycloaliphatic anhydride as a cross-linking agent and 1-methyl imidazole as
an initiator were investigated. The combination of DGEBA with 40 wt % ESO
resulted in a resin with significant improvement in the impact strength (38%
higher than the neat DGEBA) accompanied by a small reduction of the glass
transition temperature, Tg (from
120ªC to 109ºC) a reduction of about 11ºC in Tg value and without a loss in
transparency and with additional
benefit of being more environmentally sound than neat synthetic epoxy resins.
Current work is undertaken in order to
synthesize triacylglycerides containing sterically accessible
terminal epoxy functionalities
which are far more reactive than the
??internal?? epoxy groups in ESO.
DGEBA/ESO formulations were
used to produce syntactic foams. Formulation with 60%ESO and 55% (volume) of
glass microballons gave rise to foams with comparable compression and thermal
properties than those of the 100% synthetic counterpart.
Some
selected properties of shape memory copolymers obtained by cationic
copolymerization of tung oil with styrene were also studied. Tg values were
close to room temperature for all the copolymers, and values increased with
styrene content as well as occurred with the modulus. These hard elastomers
presented shape memory behavior with high recovery and fixity ratios, as well
as high damping quality (damping factors 0.4 and 1.38 at 28.9 and 43.3 °C, for
the tung oil homopolymer and the copolymer with 70 wt% styrene, respectively),
opening possibilities for practical applications that require material response
close to room temperature.