A composition-morphology map for particle-filled blends of immiscible thermoplastic polymers

Derrick Amoabeng, David Roell, Kendal M. Clouse, Brian A. Young, Sachin S. Velankar

Research output: Contribution to journalArticlepeer-review

26 Scopus citations


We explore the effects of adding silica particles to blends of two immiscible polymers, polyisobutylene (PIB) and polyethylene oxide (PEO) across a wide range of compositions, and particle loadings of up to 30 vol %. The silica particles have strong affinity for PEO, and hence, if there is sufficient PEO to fully engulf the particles, a combined phase of particles-in-PEO is formed. We construct a composition-morphology map which reveals two microstructures that are qualitatively different from those seen in particle-free polymer blends: one in which particles are bonded together by small menisci of PEO, and the other in which a highly-filled particles-in-PEO phase percolates throughout the sample. Particles widen the composition range over which co-continuous structures appear. Overall we find that particles affect the morphology greatly when the polymer preferred by the particles (PEO) is in a minority, but only modestly when the preferred polymer is in a majority.

Original languageEnglish (US)
Pages (from-to)212-223
Number of pages12
StatePublished - Jun 16 2017

All Science Journal Classification (ASJC) codes

  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry


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