Polyisoprene-polystyrene diblock copolymer phase diagram near the order-disorder transition

A.K. Khandpur; S. Förster; F.S. Bates; I.W. Hamley; A.J. Ryan; W. Bras; K. Almdal; K. Mortensen

doi:10.1021/ma00130a012

Polyisoprene-polystyrene diblock copolymer phase diagram near the order-disorder transition

A.K. Khandpur, S. Förster, F.S. Bates, I.W. Hamley, A.J. Ryan, W. Bras, K. Almdal, K. Mortensen

Research output: Contribution to journal › Journal article › Research › peer-review

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
Journal	Macromolecules
Volume	28
Issue number	26
Pages (from-to)	8796-8806
ISSN	0024-9297
DOIs	https://doi.org/10.1021/ma00130a012
Publication status	Published - 1995

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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.",

keywords = "Materialer med s{\ae}rlige fysiske og kemiske egenskaber",

author = "A.K. Khandpur and S. F{\"o}rster and F.S. Bates and I.W. Hamley and A.J. Ryan and W. Bras and K. Almdal and K. Mortensen",

year = "1995",

doi = "10.1021/ma00130a012",

language = "English",

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pages = "8796--8806",

journal = "Macromolecules",

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TY - JOUR

T1 - Polyisoprene-polystyrene diblock copolymer phase diagram near the order-disorder transition

AU - Khandpur, A.K.

AU - Förster, S.

AU - Bates, F.S.

AU - Hamley, I.W.

AU - Ryan, A.J.

AU - Bras, W.

AU - Almdal, K.

AU - Mortensen, K.

PY - 1995

Y1 - 1995

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.

KW - Materialer med særlige fysiske og kemiske egenskaber

U2 - 10.1021/ma00130a012

DO - 10.1021/ma00130a012

M3 - Journal article

SN - 0024-9297

VL - 28

SP - 8796

EP - 8806

JO - Macromolecules

JF - Macromolecules

IS - 26

ER -

Polyisoprene-polystyrene diblock copolymer phase diagram near the order-disorder transition

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