Toughening of aromatic epoxy via aliphatic epoxy copolymers

Markus A. Downey, Lawrence T. Drzal

Research output: Contribution to journalArticle

  • 8 Citations

Abstract

While aromatic diglycidyl ether of bisphenol A (DGEBA) based epoxy polymer matrix systems are important for high-performance applications, their brittle nature is an issue that needs to be addressed. In this paper the authors show that small additions of a more flexible aliphatic epoxy copolymers, both di- and tri-functional, can significantly increase the notched Izod impact strength (56-77%) over the neat DGEBA, while not detrimentally affecting other mechanical properties such as glass transition temperature and flexural properties. In fact, at 1 wt% concentrations, the tri-functional epoxy shows a slight increase (∼2%) in the glass transition temperature compared to neat DGEBA. The improvement in impact toughness is attributed to the more flexible backbone of the aliphatic epoxy molecules. The total miscibility of the aromatic and aliphatic epoxies within the investigated concentration range (up to 20 wt%) allows for this toughening approach to be directly applied to current composite production methods, such as resin transfer molding (RTM).

LanguageEnglish (US)
Pages6658-6663
Number of pages6
JournalPolymer (United Kingdom)
Volume55
Issue number26
DOIs
StatePublished - Dec 15 2014

Profile

Toughening
Ethers
Copolymers
Resin transfer molding
Impact strength
Polymer matrix
Fracture toughness
Solubility
Mechanical properties
Molecules
Composite materials
2,2-bis(4-glycidyloxyphenyl)propane
Glass transition temperature

Keywords

  • Aliphatic epoxy
  • Enhanced impact strength
  • Toughening

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics

Cite this

Toughening of aromatic epoxy via aliphatic epoxy copolymers. / Downey, Markus A.; Drzal, Lawrence T.

In: Polymer (United Kingdom), Vol. 55, No. 26, 15.12.2014, p. 6658-6663.

Research output: Contribution to journalArticle

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