Toughening of BMI based graphite laminates by Ex-situ concept

Qun Feng Cheng, Ya Hong Xu, Xiao Su Yi

Research output: Journal PublicationArticlepeer-review


High-performance bismaleimdes (BMI) matrix composites reinforced by graphite fibers were prepared and toughened with a thermoplastic component (PAEK) by using the Ex-situ concept. Experimental matrix was designed for overall toughening of the base resin, periodically interleaving thermoplastic films into each plies (Ex-situ concept) and for varying the film compositions. The highest impact damage resistance characterized by compression after impact (CAI) was obtained for the laminates toughened on the Ex-situ concept, especially, when two-component cast films of a special ration of PAEK/BM/60:40 were interleaved though the thermoplastic concentration for the overall toughening, interleaving the pure thermoplastic films and the two-component films was comparable. There were two peaks found in the DSC trace of the laminates toughened implying a phase separation process occurred. The glass transition temperature of the laminates toughened was slightly reduced due to the low-temperature PAEK. Morphological study revealed a typical granular structure just in the interplay region as a result of spinodal decomposition and coarsening process. This was in agreement with the result of DSC investigation.

Original languageEnglish
Pages (from-to)41-45
Number of pages5
JournalCailiao Gongcheng/Journal of Materials Engineering
Issue number5
Publication statusPublished - May 2006
Externally publishedYes


  • Bismaleimdes
  • Compression after impact
  • Ex-situ concept

ASJC Scopus subject areas

  • Aerospace Engineering


Dive into the research topics of 'Toughening of BMI based graphite laminates by Ex-situ concept'. Together they form a unique fingerprint.

Cite this