Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5210134 | Reactive and Functional Polymers | 2012 | 8 Pages |
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.
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Related Topics
Physical Sciences and Engineering
Chemistry
Organic Chemistry
Authors
Adrian Tomuta, Francesc Ferrando, Ãngels Serra, Xavier Ramis,