Toughening of aromatic epoxy via aliphatic epoxy copolymers

Markus A. Downey, Lawrence T. Drzal

    Research output: Research - peer-reviewArticle

    • 7 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
    Copolymers
    2,2-bis(4-glycidyloxyphenyl)propane
    Ethers
    Glass transition temperature
    Resin transfer molding
    Impact strength
    Polymer matrix
    Fracture toughness
    Solubility
    Mechanical properties
    Molecules
    Composite materials

    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: Research - peer-reviewArticle

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