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Journal of Materials Science

, Volume 32, Issue 18, pp 4749–4758 | Cite as

Fracture mechanisms of poly(ethylene terephthalate) and blends with styrene-butadiene-styrene elastomers

  • V Tanrattanakul
  • W. G Perkins
  • F. L Massey
  • A Moet
  • A Hiltner
  • E Baer
Article

Abstract

Poly(ethylene terephthalate) (PET) was blended with 5 wt % of an elastomeric block copolymer. The hydrogenated styrene-butadiene-styrene (SEBS) elastomers were functionalized with 0–4.5 wt % maleic anhydride grafted on the midblock. Notched tensile tests in the temperature range − 40–55 °C differentiated among the blends in terms of their toughness. The least effective elastomer was the unfunctionalized SEBS; all the functionalized SEBS elastomers effectively increased the toughness of PET. Fractographic analysis indicated that PET and the blend with unfunctionalized SEBS fractured through a pre-existing craze. Although adhesion of the unfunctionalized SEBS to the matrix was poor, the elastomer strengthened the craze somewhat, as indicated by an increase in length of the pre-existing craze when final separation occurred. A functionalized SEBS caused the fracture mechanism to change from crazing to ductile yielding. Graft copolymer formed by reaction of PET hydroxyl end groups with the anhydride in situ was thought to act as an emulsifier to decrease particle size and improve adhesion. These factors promoted cavitation, which relieved the triaxiality at the notch root and permitted the matrix to shear yield.

Keywords

Fracture Surface Cavitation Crack Path Maleic Anhydride Notch Root 

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Copyright information

© Chapman and Hall 1997

Authors and Affiliations

  • V Tanrattanakul
    • 1
  • W. G Perkins
    • 2
  • F. L Massey
    • 2
  • A Moet
    • 3
  • A Hiltner
  • E Baer
  1. 1.Department of Macromolecular Science and Centre for Applied Polymer ResearchCase Western Reserve UniversityClevelandUSA
  2. 2.Polyester Technical CentreShell Chemical CompanyAkronUSA
  3. 3.Department of Chemical and Petroleum EngineeringUnited Arab Emirate UniversityUnited Arab Emirates

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