Toughening of epoxy resin by poly(ether ether ketone) with pendant fluorocarbon groups

Ye Luo, Ming Zhang, Guodong Dang, Yan Li, Xuefeng An, Chunhai Chen, Xiaosu Yi

Research output: Journal PublicationArticlepeer-review

20 Citations (Scopus)

Abstract

In this article, poly(ether ether ketone) (PEEK) with pendant fluorocarbon groups was synthesized to impart better impact resistance to diglycidyl ether of bisphenol-A (DGEBA) epoxy resins cured with 4,4′-diamino-diphenyl-sulfone (DDS). Mechanical properties were investigated as a function of the molecular weight and contents of PEEK. It was found that both impact strength and tensile strength varied with molecular weight and contents of PEEK. In the system of epoxies modified with Mn 24,000 PEEK, drastic decline rather than increase of impact strength and tensile strength was observed, while impact strength was increased by 17% for the system of epoxies modified with M n 9500 PEEK at a relatively low PEEK content. To reveal the toughening mechanism, phase morphology of the modified epoxies were examined with scanning electron microscopy (SEM) and a two-phase morphology was observed. Ductile fracture mode was observed for the modified epoxies and a rigid particle toughening mechanism was proposed. An image analysis software Quantlab-MG was used to analyze the dimension parameters of the dispersed particles for the epoxies modified with Mn 9500 PEEK. A larger and more dispersed distribution of particles at higher thermoplastic content was found. Dynamic mechanical analysis (DMA) was employed to further study the phase behavior of Mn 9500 PEEK modified epoxies. The observed phenomenon was interpreted by the reaction-induced phase separation mechanism. On the basis of the rubber elasticity theory, an indirect measurement of crosslinking density was taken and the results indicated that the incorporation of PEEK might reduce the crosslinking density of epoxies.

Original languageEnglish
Pages (from-to)1758-1765
Number of pages8
JournalJournal of Applied Polymer Science
Volume122
Issue number3
DOIs
Publication statusPublished - 5 Nov 2011
Externally publishedYes

Keywords

  • interfaces
  • mechanical properties
  • morphology
  • toughening mechanism
  • toughness

ASJC Scopus subject areas

  • Chemistry (all)
  • Surfaces, Coatings and Films
  • Polymers and Plastics
  • Materials Chemistry

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