Polyisoprene-Polystyrene Diblock Copolymer Phase Diagram near the Order-Disorder Transition

Ashish K. Khandpur; Stephan Förster; Frank S. Bates; Ian W. Hamley; Anthony J. Ryan; Wim Bras; Kristoffer Almdal; Kell Mortensen

doi:10.1021/ma00130a012

Polyisoprene-Polystyrene Diblock Copolymer Phase Diagram near the Order-Disorder Transition

Ashish K. Khandpur, Stephan Förster, Frank S. Bates, Ian W. Hamley, Anthony J. Ryan, Wim Bras, Kristoffer Almdal, Kell Mortensen

Chemical Engineering and Materials Science

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Abstract

The phase behavior often polyisoprene-polystyrene (PI-PS) diblock copolymers, spanning the composition range from 0.24 to 0.82 polyisoprene volume fraction (f_PI), has been studied near the order-disorder transition (ODT). Dynamic mechanical spectroscopy, transmission electron microscopy, and neutron and X-ray scattering have been used to characterize phase transition temperatures and ordered state symmetries. Five distinct microstructures weee observed for this chemical system: spheres, hexagonally packed cylinders (HEX), lamellae (LAM), hexagonally perforated layers (HPL), and a bicontinuous cubic phase having an Ia3d space group symmetry. The bicontinuous Ia3d phase only occuss in the vicinity of the ODT between the HEX and LAM states at compositions of 0.65; ≲ f_PI ≲ 0.68 and 0.36 ≲ f_PI ≲ 0.39 (prior report). Farther from the ODT, within these composition ranges, the HPL phase occurs. We did not find the ordered bicontinuous double diamond (OBDD) morphology at any composition or temperature studied, and the overall phase diagram is qualitatively different from those reported previously for PI-PS block copolymers.

Original language	English (US)
Pages (from-to)	8796-8806
Number of pages	11
Journal	Macromolecules
Volume	28
Issue number	26
DOIs	https://doi.org/10.1021/ma00130a012
State	Published - Dec 1 1995

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@article{083b442082ea4db589f17fa711cba618,

title = "Polyisoprene-Polystyrene Diblock Copolymer Phase Diagram near the Order-Disorder Transition",

abstract = "The phase behavior often polyisoprene-polystyrene (PI-PS) diblock copolymers, spanning the composition range from 0.24 to 0.82 polyisoprene volume fraction (fPI), has been studied near the order-disorder transition (ODT). Dynamic mechanical spectroscopy, transmission electron microscopy, and neutron and X-ray scattering have been used to characterize phase transition temperatures and ordered state symmetries. Five distinct microstructures weee observed for this chemical system: spheres, hexagonally packed cylinders (HEX), lamellae (LAM), hexagonally perforated layers (HPL), and a bicontinuous cubic phase having an Ia3d space group symmetry. The bicontinuous Ia3d phase only occuss in the vicinity of the ODT between the HEX and LAM states at compositions of 0.65; ≲ fPI ≲ 0.68 and 0.36 ≲ fPI ≲ 0.39 (prior report). Farther from the ODT, within these composition ranges, the HPL phase occurs. We did not find the ordered bicontinuous double diamond (OBDD) morphology at any composition or temperature studied, and the overall phase diagram is qualitatively different from those reported previously for PI-PS block copolymers.",

author = "Khandpur, {Ashish K.} and Stephan F{\"o}rster and Bates, {Frank S.} and Hamley, {Ian W.} and Ryan, {Anthony J.} and Wim Bras and Kristoffer Almdal and Kell Mortensen",

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T1 - Polyisoprene-Polystyrene Diblock Copolymer Phase Diagram near the Order-Disorder Transition

AU - Khandpur, Ashish K.

AU - Förster, Stephan

AU - Bates, Frank S.

AU - Hamley, Ian W.

AU - Ryan, Anthony J.

AU - Bras, Wim

AU - Almdal, Kristoffer

AU - Mortensen, Kell

PY - 1995/12/1

Y1 - 1995/12/1

N2 - The phase behavior often polyisoprene-polystyrene (PI-PS) diblock copolymers, spanning the composition range from 0.24 to 0.82 polyisoprene volume fraction (fPI), has been studied near the order-disorder transition (ODT). Dynamic mechanical spectroscopy, transmission electron microscopy, and neutron and X-ray scattering have been used to characterize phase transition temperatures and ordered state symmetries. Five distinct microstructures weee observed for this chemical system: spheres, hexagonally packed cylinders (HEX), lamellae (LAM), hexagonally perforated layers (HPL), and a bicontinuous cubic phase having an Ia3d space group symmetry. The bicontinuous Ia3d phase only occuss in the vicinity of the ODT between the HEX and LAM states at compositions of 0.65; ≲ fPI ≲ 0.68 and 0.36 ≲ fPI ≲ 0.39 (prior report). Farther from the ODT, within these composition ranges, the HPL phase occurs. We did not find the ordered bicontinuous double diamond (OBDD) morphology at any composition or temperature studied, and the overall phase diagram is qualitatively different from those reported previously for PI-PS block copolymers.

AB - The phase behavior often polyisoprene-polystyrene (PI-PS) diblock copolymers, spanning the composition range from 0.24 to 0.82 polyisoprene volume fraction (fPI), has been studied near the order-disorder transition (ODT). Dynamic mechanical spectroscopy, transmission electron microscopy, and neutron and X-ray scattering have been used to characterize phase transition temperatures and ordered state symmetries. Five distinct microstructures weee observed for this chemical system: spheres, hexagonally packed cylinders (HEX), lamellae (LAM), hexagonally perforated layers (HPL), and a bicontinuous cubic phase having an Ia3d space group symmetry. The bicontinuous Ia3d phase only occuss in the vicinity of the ODT between the HEX and LAM states at compositions of 0.65; ≲ fPI ≲ 0.68 and 0.36 ≲ fPI ≲ 0.39 (prior report). Farther from the ODT, within these composition ranges, the HPL phase occurs. We did not find the ordered bicontinuous double diamond (OBDD) morphology at any composition or temperature studied, and the overall phase diagram is qualitatively different from those reported previously for PI-PS block copolymers.

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Polyisoprene-Polystyrene Diblock Copolymer Phase Diagram near the Order-Disorder Transition

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