Block copolymer compatibilization of cocontinuous polymer blends

Jeffrey A. Galloway, Hyun K. Jeon, Joel R. Bell, Chris Macosko

Research output: Contribution to journalArticlepeer-review

107 Scopus citations

Abstract

The effect of block copolymers on the cocontinuous morphology of 50/50 (w/w) polystyrene (PS)/high density polyethylene (HDPE) blends was investigated using symmetric polystyrene-polyethylene block copolymers (PS-PE) with molecular weights varying from 6 to 200 kg/mol. The coarsening rate during annealing was compared to the Doi-Ohta theory. An intermediate molecular weight PS-PE, 40 kg/mol, showed remarkable results in reducing the phase size and stabilizing the blend morphology during annealing. Mixing small amounts of 6, 100 or 200 kg/mol PS-PE in the blend did not reduce the phase size significantly, but did decrease the coarsening rate during annealing. In stabilizing the morphology, 6 kg/mol PS-PE was inferior to 100 and 200 kg/mol. The existence of an optimal molecular weight block copolymer is due to a balance between the ability of the block copolymer to reach the interface and its relative stabilization effect at the interface.

Original languageEnglish (US)
Pages (from-to)183-191
Number of pages9
JournalPolymer
Volume46
Issue number1
DOIs
StatePublished - Jan 6 2005

Keywords

  • Cocontinuous
  • Copolymer
  • Polystyrene-polyethylene block copolymers

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