Application of carbon fiber/RTMable polyimide composites by ex-situ toughness method

Zhizhen Liu, Enyu Guo, Jun Xing, Hongyun Li, Xiaosu Yi, Zhen Wang, Yang Yu

Research output: Journal PublicationArticlepeer-review

11 Citations (Scopus)

Abstract

The effect of ex-situ method on the mechanical properties and toughness of the RTMable carbon fiber (G827)/polyimide(PI-9731) composites was studied. The results show that the interlaminar shear strength of G827/PI-9731 composites toughened by the ex-situ methods with powder and film increases from 97.9 MPa to 108 MPa and 110 MPa, respectively, when the thermoplastic PI mass fraction is 15% at room temperature. However, the interlaminar shear strength changes slightly at high temperature (288°C). The mode I fracture toughness of G827/PI-9731 composites toughened with powder method is improved from 310 J/m2 to 410 J/m2. The Mode II fracture toughness is improved from 590 J/m2 to 939 J/m2. However the mode I fracture toughness of G827/PI-9731 composites toughened with film method increases to 459 J/m2. The mode II fracture toughness is improved to 1100 J/m2. By SEM analysis, it is found that the toughness improvement results from the introduction of thermoplastic PI and the formation of the TP/TS phase inversion structure in the interlaminar regions, in which the PI-9731 particles wrapped by thermoplastic PI will be orientated and deformed in the process of crack extension.

Original languageEnglish
Pages (from-to)1-8
Number of pages8
JournalFuhe Cailiao Xuebao/Acta Materiae Compositae Sinica
Volume27
Issue number6
Publication statusPublished - Dec 2010
Externally publishedYes

Keywords

  • Composites
  • Ex-situ toughening
  • Mechanical properties
  • Polyimides
  • RTM

ASJC Scopus subject areas

  • Ceramics and Composites
  • Chemistry (all)
  • Condensed Matter Physics
  • Mechanics of Materials

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