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Encyclopedia of polymer science and engineering
- Publisher
- Springer Journals
- Copyright
- Copyright © 2003 by Kluwer Academic Publishers
- Subject
- Materials Science; Materials Science, general; Characterization and Evaluation of Materials; Polymer Sciences; Continuum Mechanics and Mechanics of Materials; Crystallography and Scattering Methods; Classical Mechanics
- ISSN
- 0022-2461
- eISSN
- 1573-4803
- DOI
- 10.1023/A:1021182320285
- Publisher site
- See Article on Publisher Site
Abstract
An epoxy-functionalized hyperbranched polymer (HBP) was used to toughen a conventional epoxy resin, diglycidyl ether of bisphenol A (DGEBA) cured with diethyltoluene-2,6-diamine (DETDA). There was little change in gel time as a result of addition of HBP, even though the HBP reacts at a slower rate with amine hardeners compared to DGEBA alone. Phase separation was investigated for various HBP contents and as a function of cure conditions as well. The thermal and dynamic viscoelastic behavior of the modified matrices have been examined and compared to the DGEBA epoxy matrix. It appears that the HBP which phase separates does not react as fully as when it is reacted with the amine alone. Nonetheless, good improvement in impact strength as a result of incorporation of HBP were observed and explained in terms of morphological behavior for a DGEBA matrix modified with various amounts of HBP.
Journal
Journal of Materials Science – Springer Journals
Published: Oct 6, 2004