New aromatic-aliphatic hyperbranched polyesters with vinylic end groups of different length as modifiers of epoxy/anhydride thermosets
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10.1016/j.reactfunctpolym.2012.05.008
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hdl:2117/19589
Tipus de documentArticle
Data publicació2012-09
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Abstract
The synthesis and characterization of two new aromatic–aliphatic hyperbranched polyesters modified
with long and short vinylic chains was reported. These hyperbranched polymers were used as toughening
modifiers of epoxy/anhydride thermosets. The curing of mixtures of diglycidyl ether of bisphenol A and
hexahydro-4-methylphtalic anhydride with different proportions of both hyperbranched polymers using
N,N-benzyldimethylamine as catalyst was investigated by differential scanning calorimetry. The kinetic
of curing process was established using an isoconversional integral procedure. The characterization of
these materials was done by means of several thermal analysis techniques and their morphology was
investigated by electron microscopy. The addition of highly branched structures led to homogeneous
morphologies and a more toughening fracture of the thermosets in comparison to the neat epoxy/anhydride
material. The modified thermosets presented slightly lower glass transition temperature than the
unmodified one and the thermal stability barely changed by the addition of the modifiers.
CitacióTomuta, A. [et al.]. New aromatic-aliphatic hyperbranched polyesters with vinylic end groups of different length as modifiers of epoxy/anhydride thermosets. "Reactive and functional polymers", Setembre 2012, vol. 72, núm. 9, p. 556-563.
ISSN1381-5148
Versió de l'editorhttp://www.sciencedirect.com/science/article/pii/S1381514812001484
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