ABA and ABC type thermoplastic elastomer toughening of epoxy matrices

Gomatheeshwar Pitchiaya, Lawrence Drzal

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Epoxy-matrix composites have found widespread use in the aerospace, adhesive, and coating fields. Upon curing, the highly-cross linked microstructure provides high modulus and strength, excellent creep resistance, but lacks ductility and is a subject of extensive research. One approach to improve the mechanical toughness is the addition of thermoplastic elastomers (TPEs). This approach is attractive since TPEs possess ductility accompanied by improved strength and stiffness without compromising the visco-elastic properties. TPEs self-assemble into micro or nano-domains in the thermoset matrix, depending on the choice of curing agent used. The mechanical and thermal properties that result are also affected by the processing technique, choice of curing agent and cure cycle. The TPEs investigated here are triblock copolymers of styrene-butadiene-methyl methacrylate (SBM) and methylmethacrylate-butylacrylate-methylmethacrylate (MAM) of the ABC and ABA type, respectively. The effect of concentration (1-12.5 wt %) of these TPEs on a diglycidyl ether of bisphenol-A (DGEBA) epoxy cured with metaphenylenediamine, has been investigated. The TPE-DGEBA epoxies were characterized by Thermo gravimetric Analysis (TGA), Dynamic Mechanical Analysis (DMA), impact, rheology and Scanning Electron Microscopy (SEM). The TPEs micro-phase separated into particles when the DGEBA-mPDA reaction took place. A non-linear increase with up to 60% in Izod impact strength was observed with increased concentration of TPEs, and up to a 70% increase was observed with synergistic toughening with graphene nanoplatelets and SBM. In addition, fracture toughness was improved ∼250% with TPE addition to epoxy/mPDA matrix. The flexural modulus and strength was unaffected up to 5 wt% loading of TPEs, and exhibited less than 10% decrease at higher weight percent. The choice of processing technique (magnetic stirring, paddle mixing, ultrasonication, vacuum agitation) produced different levels of shear which also had an effect on the mechanical properties and transparency of the system.

LanguageEnglish (US)
Title of host publicationInternational SAMPE Technical Conference
PublisherSoc. for the Advancement of Material and Process Engineering
ISBN (Print)9781934551165
StatePublished - 2014
EventSAMPE Tech Seattle 2014 Conference - Seattle, United States
Duration: Jun 2 2014Jun 5 2014

Other

OtherSAMPE Tech Seattle 2014 Conference
CountryUnited States
CitySeattle
Period6/2/146/5/14

Profile

Thermoplastic elastomers
Toughening
Methylmethacrylate
Curing
Ethers
Methacrylates
Butadiene
Ductility
Styrene
Mechanical properties
Creep resistance
Graphite
Thermosets
Impact strength
Dynamic mechanical analysis
Processing
Rheology
Transparency
Graphene
Block copolymers

ASJC Scopus subject areas

  • Mechanical Engineering
  • Mechanics of Materials
  • Materials Science(all)

Cite this

Pitchiaya, G., & Drzal, L. (2014). ABA and ABC type thermoplastic elastomer toughening of epoxy matrices. In International SAMPE Technical Conference Soc. for the Advancement of Material and Process Engineering.

ABA and ABC type thermoplastic elastomer toughening of epoxy matrices. / Pitchiaya, Gomatheeshwar; Drzal, Lawrence.

International SAMPE Technical Conference. Soc. for the Advancement of Material and Process Engineering, 2014.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Pitchiaya, G & Drzal, L 2014, ABA and ABC type thermoplastic elastomer toughening of epoxy matrices. in International SAMPE Technical Conference. Soc. for the Advancement of Material and Process Engineering, SAMPE Tech Seattle 2014 Conference, Seattle, United States, 6/2/14.
Pitchiaya G, Drzal L. ABA and ABC type thermoplastic elastomer toughening of epoxy matrices. In International SAMPE Technical Conference. Soc. for the Advancement of Material and Process Engineering. 2014.
Pitchiaya, Gomatheeshwar ; Drzal, Lawrence. / ABA and ABC type thermoplastic elastomer toughening of epoxy matrices. International SAMPE Technical Conference. Soc. for the Advancement of Material and Process Engineering, 2014.
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