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Copolymerizing behavior and processability of benzoxazine/epoxy systems and their applications for glass fiber composite laminates
Author(s) -
Xu Mingzhen,
Yang Xulin,
Zhao Rui,
Liu Xiaobo
Publication year - 2012
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.38422
Subject(s) - materials science , flexural strength , epoxy , composite material , composite number , copolymer , differential scanning calorimetry , flexural modulus , dynamic mechanical analysis , izod impact strength test , modulus , composite laminates , glass fiber , thermal stability , fiber , polymer , ultimate tensile strength , chemical engineering , physics , engineering , thermodynamics
Copolymerizing behavior and processability of epoxy/benzoxazine containing cyano groups (EP/BA‐ph) systems were investigated by differential scanning calorimetry and dynamic rheological analysis. The results showed that EP/BA‐ph systems exhibited two characteristic peaks corresponding to ring‐opening of benzoxazine and ring‐formation of cyano groups, respectively. Compared with BA‐ph, EP/BA‐ph copolymer processability was improved and can be controlled by varying EP contents, processing temperature, and time. Then EP/BA‐ph copolymers were employed to prepare EP/BA‐ph/glass fiber (GF) composite laminates and their mechanical, morphological, and thermal properties were investigated. Compared with those of BA‐ph/GF composites, the flexural strength, and modulus of EP/BA‐ph/GF composites with 50 wt % EP content were increased by 13.5 and 20%, respectively. The enhancements in mechanical properties are mainly due to the strong interfacial adhesions between GF and matrices, which was confirmed by SEM observations. All EP/BA‐ph/GF composite laminates are stable up to 510°C in air. EP/BA‐ph/GF laminates will have potential applications in the areas where require of excellent mechanical properties and high temperature resistance. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013