Phase behavior of pure diblocks and binary diblock blends of poly(ethylene)-poly(ethylethylene)

Jin Zhao, Biswaroop Majumdar, Mark F. Schulz, Frank S Bates, Kristoffer Almdal, Kell Mortensen, Damian A. Hajduk, Sol M. Gruner

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193 Scopus citations

Abstract

We have determined the phase behavior of a series of model poly(ethylene)-poly-(ethylethylene) (PE-PEE) diblock copolymers with poly(ethylene) block volume fractions (fPE) ranging from 0.25 to 0.46. Four ordered microstructures make contact with the ODT: spheres arranged on a body-centered cubic lattice (Im3m space group), cylinders packed on a hexagonal lattice, a bicontinuous structure of space group Ia3d, and lamellae. A fifth ordered phase, tentatively identified as hexagonally perforated layers (HPL), separates the cylindrical and lamellar morphologies at moderate or greater degrees of segregation. Binary blends of fPE = 0.37 and 0.46 diblocks were used to investigate the bicontinuous cubic phase region in greater detail; these experiments indicate that this phase extends as much as 100 °C below the ODT for (fPE) values in the blend from 0.385 to 0.420.

Original languageEnglish (US)
Pages (from-to)1204-1215
Number of pages12
JournalMacromolecules
Volume29
Issue number4
DOIs
StatePublished - Feb 12 1996

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