Structure, thermal and fracture mechanical properties of benzoxazine-modified amine-cured DGEBA epoxy resins

S. Grishchuk, Z. Mbhele, S. Schmitt, J. Karger-Kocsis

Research output: Contribution to journalArticle

46 Citations (Scopus)

Abstract

First, traditional diamine hardeners of epoxy resins (EP) were checked as potential accelerators for the benzoxazine (BOX) homopolymerization. It was established that the acceleration effect depends on both the type and amount of the diamine compounds. In the follow-up work amine-curable diglycidyl ether bisphenol A (DGEBA) type EP was modified with BOX keeping the EP/BOX ratio constant (75/25 wt.%). The amine hardeners, added in the EP in stoichiometric amounts, were of aliphatic and aromatic nature, viz. diethylenetriamine (DETA), 4,4!-diaminodiphenyl methane (DDM), and their 1/1 mixture. The thermal, viscoelastic, flexural and fracture mechanical properties of the EP/BOX hybrids were determined and compared to those of the reference EPs. Based on dynamic-mechanical thermal analysis and atomic force microscopy the formation of co-network between EP and BOX was concluded. Homopolymerized BOX was built in the network in nanoscaled inclusions and it was associated with internal antiplasticization. Incorporation of BOX improved the charring, enhanced the flexural modulus and strength, and reduced the glass transition of the parent EP. The fracture toughness and energy were not improved by hybridization with BOX.

Original languageEnglish
Pages (from-to)273-282
Number of pages10
JournalExpress Polymer Letters
Volume5
Issue number3
DOIs
Publication statusPublished - 2011

Fingerprint

Benzoxazines
hardeners
Epoxy Resins
bisphenols
epoxy resins
diamines
Epoxy resins
Amines
Ethers
ethers
amines
charring
mechanical properties
Mechanical properties
Fracture energy
Homopolymerization
fracture strength
Thermoanalysis
Particle accelerators
Fracture toughness

Keywords

  • Benzoxazine
  • Epoxy resin
  • Fracture mechanics
  • Morphology
  • Thermosetting resins

ASJC Scopus subject areas

  • Polymers and Plastics
  • Materials Chemistry
  • Chemical Engineering(all)
  • Organic Chemistry
  • Physical and Theoretical Chemistry

Cite this

Structure, thermal and fracture mechanical properties of benzoxazine-modified amine-cured DGEBA epoxy resins. / Grishchuk, S.; Mbhele, Z.; Schmitt, S.; Karger-Kocsis, J.

In: Express Polymer Letters, Vol. 5, No. 3, 2011, p. 273-282.

Research output: Contribution to journalArticle

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