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

doi:10.1021/ma9507251

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

Chemical Engineering and Materials Science

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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 (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 (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 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.

Original language	English (US)
Pages (from-to)	1204-1215
Number of pages	12
Journal	Macromolecules
Volume	29
Issue number	4
DOIs	https://doi.org/10.1021/ma9507251
State	Published - Feb 12 1996

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title = "Phase behavior of pure diblocks and binary diblock blends of poly(ethylene)-poly(ethylethylene)",

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.",

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AU - Zhao, Jin

AU - Majumdar, Biswaroop

AU - Schulz, Mark F.

AU - Bates, Frank S

AU - Almdal, Kristoffer

AU - Mortensen, Kell

AU - Hajduk, Damian A.

AU - Gruner, Sol M.

PY - 1996/2/12

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N2 - 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.

AB - 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.

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

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