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Improvement of epoxy thermosets using a thiol‐ene based polyester hyperbranched polymer as modifier
Author(s) -
Foix David,
Ramis Xavier,
Ferrando Francesc,
Serra Angels
Publication year - 2012
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/pi.3230
Subject(s) - diglycidyl ether , differential scanning calorimetry , thermosetting polymer , curing (chemistry) , glass transition , epoxy , polymer chemistry , materials science , fourier transform infrared spectroscopy , polymer , ether , polyester , dynamic mechanical analysis , copolymer , composite material , bisphenol a , chemical engineering , organic chemistry , chemistry , physics , thermodynamics , engineering
The anionic curing initiated by 1‐methyl imidazole of diglycidyl ether of bisphenol A with a hyperbranched polymer (HBP) containing long aliphatic chains in the structure were studied. The hydroxyl groups present as chain ends in the HBP structure played an important role in the curing kinetics, as demonstrated by differential scanning calorimetry, Fourier transform infrared spectroscopy and rheological studies. Properties such as shrinkage on curing and thermomechanical characteristics were also investigated. The structure of the HBP, which contains long aliphatic chains and reactive hydroxyl groups as chain ends, flexibilizes the network significantly, improving the impact resistance without notably affecting either the glass transition temperature or the microhardness of the modified thermosets. Copyright © 2012 Society of Chemical Industry