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Morphological effects on Glass Transitions in Immiscible Polymer Blends

Published online by Cambridge University Press:  01 February 2011

Vivek M. Thirtha ,
Richard L. Lehman  and
Thomas J. Nosker
Vivek M. Thirtha
Affiliation:
Dept of Ceramic and Materials Engineering, Rutgers University, Piscataway NJ 08854, USA
Richard L. Lehman
Affiliation:
Dept of Ceramic and Materials Engineering, Rutgers University, Piscataway NJ 08854, USA
Thomas J. Nosker
Affiliation:
Dept of Ceramic and Materials Engineering, Rutgers University, Piscataway NJ 08854, USA
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Abstract

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.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 856: Symposium BB – Multicomponent Polymer Systems-Phase Behavior, Dynamics, and Applications , 2004 , BB11.12
Copyright
Copyright © Materials Research Society 2005

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References

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