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Toughness improvement of high‐performance epoxy resin using aminated polyetherimide
Author(s) -
Shin Seunghan,
Jang Jyongsik
Publication year - 1997
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/(sici)1097-4628(19970912)65:11<2237::aid-app21>3.0.co;2-z
Subject(s) - polyetherimide , epoxy , materials science , composite material , ethylenediamine , flexural strength , fracture toughness , toughening , toughness , amination , curing (chemistry) , polymer , chemistry , organic chemistry , catalysis
A tetrafunctional epoxy resin was modified with polyetherimide (PEI) to improve its fracture toughness. To improve the high‐performance epoxy toughening, the effective functional groups were introduced for pristine PEI. PEI containing a ethylamine group as a functionality was obtained by reacting it with ethylenediamine. In the mode I fracture test, the K Ic values of aminated PEI‐toughened epoxies were higher than that of pristine PEI‐toughened epoxy. The maximum K Ic value was obtained when the interface between the PEI domain and the epoxy matrix was strengthened without much disturbing of the spherical domain shape. In addition, it was also observed that the toughening effect of aminated PEI depended on the amount of curing agent. The flexural strengths of aminated PEI‐toughened epoxies were also higher than that of pristine PEI‐toughened epoxy. However, when excessive amination was performed, the flexural strength of aminated PEI‐toughened epoxy decreased due to the reduction of physical properties of PEI. © 1997 John Wiley & Sons, Inc. J Appl Polym Sci 65: 2237–2246, 1997