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The Effect of the Degree of Branching in Hyperbranched Polyesters Used as Reactive Modifiers in Epoxy Thermosets

✍ Scribed by David Foix; Anna Khalyavina; Mireia Morell; Brigitte Voit; Albena Lederer; Xavier Ramis; Angels Serra

Publisher
John Wiley and Sons
Year
2011
Tongue
English
Weight
447 KB
Volume
297
Category
Article
ISSN
1438-7492

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✦ Synopsis

Abstract

The effect of the degree of branching (DB) of a hyperbranched polyester (GBPEX) added as a modifier of new thermosets obtained from diglycidylether of bisphenol A has been studied. The use of ytterbium triflate as cationic initiator allows the hydroxyl chain‐ends in the GBPEX to become covalently linked to the matrix through the monomer activated propagation mechanism. The curing process has been studied by DSC and rheology. The DB of the modifier does not affect appreciably the thermal stability and the chemical reworkability but shrinkage exhibits a significant reduction on increasing the DB. Thermomechanical characteristics are also improved with increasing the DB of the modifier.

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