Phase Behavior of Pure Diblocks and Binary Diblock Blends of Poly(ethylene)−Poly(ethylethylene)

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 (f PE) ranging from 0.25 to 0.46. Four ordered microstructures make contact with the ODT:  spheres arranged on a body-centered cubic la...

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Bibliographic Details
Published in:Macromolecules 1996-02, Vol.29 (4), p.1204-1215
Main Authors: Zhao, Jin, Majumdar, Biswaroop, Schulz, Mark F, Bates, Frank S, Almdal, Kristoffer, Mortensen, Kell, Hajduk, Damian A, Gruner, Sol M
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
Properties and characterization
Thermal and thermodynamic properties
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Summary: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 (f PE) ranging from 0.25 to 0.46. Four ordered microstructures make contact with the ODT:  spheres arranged on a body-centered cubic lattice (Im3̄m space group), cylinders packed on a hexagonal lattice, a bicontinuous structure of space group Ia3̄d, 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 f PE = 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 〈f PE〉 values in the blend from 0.385 to 0.420.
ISSN:0024-9297
1520-5835
DOI:10.1021/ma9507251