Structure and properties of PBO-PEO diblock copolymer modified epoxy

Junxian Wu, Yonathan S. Thio, Frank S. Bates

Research output: Contribution to journalArticlepeer-review

181 Scopus citations

Abstract

Amphiphilic poly(n-butylene oxide)-b-poly(ethylene oxide) (PBO-PEO) diblock copolymers of various compositions were synthesized and studied as modifiers for epoxy resins. In blends of PBO-PEO, epoxy resin, and curing agent, the copolymers formed well-defined microstructures that persisted upon curing of the epoxy. The resulting morphologies were vesicles, worm-like micelles, and spherical micelles (in order of increasing size of PEO block), as well as transitional morphologies. Addition of 5% by weight of these block copolymers improved the fracture toughness of the epoxy by as much as 19 times with relatively small reduction in the elastic modulus. The highest level of toughness was measured in a system containing branched worm-like micelles. Close examination of the fracture surfaces of these compositions suggests that although all the dispersed morphologies played a similar role to inclusions in particle-toughened thermosets, crack deflection toughening contributed to the significantly higher levels of toughness in the worm-like micelle systems.

Original languageEnglish (US)
Pages (from-to)1950-1965
Number of pages16
JournalJournal of Polymer Science, Part B: Polymer Physics
Volume43
Issue number15
DOIs
StatePublished - Aug 1 2005

Keywords

  • Amphiphilic block copolymers
  • Epoxy
  • Toughness
  • Worm-like micelles

Fingerprint

Dive into the research topics of 'Structure and properties of PBO-PEO diblock copolymer modified epoxy'. Together they form a unique fingerprint.

Cite this