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Synthesis of a New Hyperbranched Polyaminoester and Its Use as a Reactive Modifier in Anionic Curing of DGEBA Thermosets
Author(s) -
Morell Mireia,
FernándezFrancos Xavier,
Ramis Xavier,
Serra Angels
Publication year - 2010
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.201000152
Subject(s) - thermosetting polymer , curing (chemistry) , polymer chemistry , epoxy , materials science , toughness , chemistry , chemical engineering , composite material , engineering
The synthesis and characterization of a new hyperbranched PAE with a flexible structure and terminal hydroxyl groups is reported. The influence of PAE in the anionic curing of DGEBA with 1‐methylimidazole was studied. The curing reaction was investigated by DSC and FT‐IR. The covalent incorporation of the modifier in the matrix was proven. The addition of PAE to the formulation reduced the contraction on curing. The modified materials were more thermally degradable than neat DGEBA thermosets, which is advantageous from the point of view of their reworkability. Their T g s were reduced by the flexibility introduced by the aliphatic structure of PAE. SEM microscopy on the fractured surface of cured samples revealed a homogeneous morphology and a possible effect of PAE as a toughness enhancer.