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Improving the toughness of epoxy with a reactive tetrablock copolymer containing maleic anhydride
Author(s) -
He Ren,
Zhan Xiaoli,
Zhang Qinghua,
Chen Fengqiu
Publication year - 2016
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/app.42826
Subject(s) - epoxy , materials science , copolymer , maleic anhydride , diglycidyl ether , thermosetting polymer , toughness , polystyrene , composite material , bisphenol a , styrene , polymer chemistry , polymer
Reactive block copolymers (BCPs) provide a unique means for toughening epoxy thermosets because covalent linkages provide opportunities for greater improvement in the fracture toughness ( K IC ). In this study, a tailored reactive tetrablock copolymer, poly[styrene‐ alt ‐(maleic anhydride)]‐ block ‐polystyrene‐ block ‐poly( n ‐butyl acrylate)‐ block ‐polystyrene, was incorporated into a diglycidyl ether of bisphenol A based epoxy resin. The results demonstrate the advantage of reactive BCP in finely tuning and controlling the structure of epoxy blends, even with 95 wt % epoxy‐immiscible triblocks. The size of the dispersed phase was efficiently reduced to submicrometer level. The mechanical properties, such as K IC , of these cured blends were investigated. The addition of 10 wt % reactive BCP into the epoxy resins led to considerable improvements in the toughness, imparting nearly a 70% increase in K IC . The designed reactive tetrablock copolymer opened good prospects because of its potential novel applications in toughening modification of engineering polymer composites. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 132 , 42826.