INVESTIGADORES
RUSECKAITE Roxana Alejandra
artículos
Título:
Thermal and Mechanical Properties of Anhydride-Cured Epoxy Resins with Different Contents of Biobased Epoxidized Soybean Oil
Autor/es:
ALTUNA, FACUNDO I; ESPÓSITO, LEANDRO H; RUSECKAITE, ROXANA A.; STEFANI, PABLO M
Revista:
JOURNAL OF APPLIED POLYMER SCIENCE
Editorial:
JOHN WILEY & SONS INC
Referencias:
Año: 2010
ISSN:
0021-8995
Resumen:
Thermosetting resins were synthesized by
the partial replacement of the synthetic epoxy prepolymer
based on diglycidyl ether of bisphenol A (DGEBA) with
increasing amounts of epoxidized soybean oil (ESO) with
methyltetrahydrophthalic anhydride as a crosslinking
agent and 1-methyl imidazole as an initiator. Calorimetric
studies showed a drop in the reaction heat with ESO content;
this was associated with the lower reactivity of oxirane
rings in ESO due to steric constrains. The effects of
the replacement of increasing amounts of synthetic
DGEBA with ESO on the network properties, such as the
storage modulus (E0) in the glassy and rubbery regions,
glass-transition temperature (Tg), and impact and compressive
properties were examined. All formulations were
transparent, although phase-separated morphologies were evidenced by scanning electron microscopy observations.
The intensity of the transmitted light passed to a minimum
at a short reaction time associated with the cloud
point and then increased continuously until the refractive
index of the dispersed phase approximated that of the
continuous phase at complete conversion. The combination
of DGEBA with 40 wt % ESO resulted in a resin with an
optimum set of properties; E0 in the glassy state was 93%
of that of the neat DGEBA resin, Tg decreased only about
11C, and the impact strength increased about 38% without
a loss of transparency