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      Manipulating morphology in thermoplastic protein/polyester blends for improved impact strength

      Smith, Matthew J.; Verbeek, Casparus Johan R.
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      Adv Polym Technol - 2017 - Smith - Manipulating morphology in thermoplastic protein polyester blends for improved impact.pdf
      1.561Mb
      DOI
       10.1002/adv.21911
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      Permanent link to Research Commons version
      https://hdl.handle.net/10289/15576
      Abstract
      Novatein thermoplastic protein was blended with 10 wt% poly(butylene adipate- co- terephthalate) (PBAT) compatibilized with Joncryl ADR- 4368 and 2- methylimidazole (2MI). Morphology was tailored for favorable impact strength through changing vis-cosity ratio (λ) and interfacial tension (γ12). For uncompatibilized blends, λ decreased and γ12 increased with increasing Novatein water content, whereas compatibilizers caused a decrease in both λ and γ12. PBAT continuity was high when uncompatibi-lized, but dispersion improved with decreasing λ and increasing γ12. The dispersed domain size decreased in all compatibilized blends; PBAT continuity was lowest in samples with the smallest λ. Compatibilized blends had higher impact strength than Novatein and uncompatibilized blends through improved interfacial adhesion, smaller domain size, and increased dispersion. By altering λ and γ12, and with ap-propriate chemical interaction, a morphology can be created for improved impact strength. Increasing PBAT content showed further increases in impact strength; however, a cocontinuous morphology formed, demonstrating that composition can override the effect of λ and γ12.
      Date
      2018-10-01
      Type
      Journal Article
      Publisher
      WILEY
      Rights
      © 2017. This work is licensed under a CC BY 4.0 licence.
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      • Science and Engineering Papers [3124]
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