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The Ordered Bicontinuous Double Diamond Structure in Binary Blends of Diblock Copolymer and Homopolymer.

Published online by Cambridge University Press:  21 February 2011

Karen I. Winey  and
Edwin L. Thomas
Karen I. Winey
Affiliation:
University of Massachusetts, Polymer Science and Engineering Department, Amherst, MA 01003
Edwin L. Thomas
Affiliation:
Massachusetts Institute of Technology, Materials Science and Engineering Department, Cambridge, MA 02139
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Abstract

We report the observation of the ordered bicontinuous double diamond (OBDD) structure in binary blends of poly(styrene-isoprene) diblock copolymer and homopolystyrene. The overall polystyrene volume fraction range is 64 - 67 PSvol% for the OBDD structure in binary blends of a lamellar diblock (SI 27/22) and a homopolymer (14.0 hPS). This composition range is approximately within the polystyrene volume fraction range established for pure diblock copolymers in the strong segregation regime having the OBDD structure. Ordered lamellae are observed at approximately 65 PSvol% when the homopolystyrene molecular weight is greater than the molecular weight of the polystyrene block of the copolymer. This observation is discussed in terms of the decreased degree of mixing between the homopolymer and the corresponding block and the resultant effect on the interfacial curvature.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 171: Symposium O – Polymer Based Molecular Composites , 1989 , 255
Copyright
Copyright © Materials Research Society 1990

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References

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