The influence of block copolymer microstructure on the toughness of compatibilized polylactide/polyethylene blends

Kelly S. Anderson, Marc A. Hillmyer

Research output: Contribution to journalArticlepeer-review

242 Scopus citations

Abstract

Poly(l-lactide) (PLLA) was melt blended with a set of polyethylenes (PE) in an effort to increase the impact strength of the PLLA. As compatibilizers, we prepared a series of molecularly distinct polylactide-polyethylene block copolymers. The influence of the copolymer structure on the matrix/dispersed phase interfacial adhesion was correlated with the mechanical properties of the PLLA composites. For the lowest modulus PE dispersed phase, the block copolymer that gave the strongest interfacial adhesion was necessary to achieve the most significant improvement in toughening. Whereas with the stiffest PE, the block copolymer that gave the weakest interfacial adhesion resulted in the greatest improvement in impact strength. For the intermediate stiffness PE, an intermediate degree of adhesion was necessary to obtain the largest increase in the impact properties. The impact properties of the composites were also found to be highly dependent on the dispersed phase properties.

Original languageEnglish (US)
Pages (from-to)8809-8823
Number of pages15
JournalPolymer
Volume45
Issue number26
DOIs
StatePublished - Dec 2004

Keywords

  • Interfacial adhesion
  • Polylactide
  • Toughening

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