Morphological effects on glass transitions in immiscible polymer blends

Vivek M. Thirtha, Richard L. Lehman, Thomas J. Nosker

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Scopus citations


This paper describes the effects of structures on the glass transition of glassy polymers blended with a semi-crystalline polymer. Immiscible blends of PS/PP and PS/HDPE were prepared from commercially available polymers using melt processing and extrusion without additives. The weight fractions of the components were varied from 0 to 1. SEM analysis of the blends showed a range of morphologies over the composition range from small inclusions at low volume concentrations through intertwined co-continuous structures at specific intermediate compositions, and a reversal of this configuration at high volume fractions. The glass transition of the glassy polymer was measured with differential scanning calorimetry using the sensitive and high resolution modulated DSC method. A systematic change in glass transition of glassy polymers is observed as a function of composition in various immiscible polymer blends. Results show that the glass transition of polystyrene increases with a reduction in volume fraction, by approximately 5.4°C in polypropylene and 6.5°C in polyethylene. Probable models which might explain this effect are mentioned.

Original languageEnglish (US)
Title of host publicationMulticomponent Polymer Systems
Subtitle of host publicationPhase Behavior, Dynamics and Applications
PublisherMaterials Research Society
Number of pages6
ISBN (Print)155899808X, 9781558998087
StatePublished - 2004
Event2004 MRS Fall Meeting - Boston. MA, United States
Duration: Nov 29 2004Dec 3 2004

Publication series

NameMaterials Research Society Symposium Proceedings
ISSN (Print)0272-9172


Other2004 MRS Fall Meeting
Country/TerritoryUnited States
CityBoston. MA

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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