Unifying weak- and strong-segregation block copolymer theories

M. W. Matsen; F. S. Bates

doi:10.1021/ma951138i

Unifying weak- and strong-segregation block copolymer theories

M. W. Matsen, F. S. Bates

Chemical Engineering and Materials Science

Research output: Contribution to journal › Article › peer-review

1588 Scopus citations

Abstract

A mean-field phase diagram for conformationally symmetric diblock melts using the standard Gaussian polymer model is presented. Our calculation, which traverses the weak- to strong-segregation regimes, is free of traditional approximations. Regions of stability are determined for disordered (DIS) melts and for ordered structures including lamellae (L), hexagonally packed cylinders (H), body-centered cubic spheres (Q_Im3̄m), close-packed spheres (CPS), and the bicontinuous cubic network with Ia3̄d symmetry (Q_Ia3̄d). The CPS phase exists in narrow regions along the order-disorder transition for χN ≥ 17.67. Results suggest that the Q_Ia3̄d phase is not stable above χN above χN approx. 60. Along the L/Q_Ia3̄d phase boundaries, a hexagonally perforated lamellar (HPL) phase is found to be nearly stable. Our results for the bicontinuous Pn3̄m cubic (Q_Pn3̄m) phase, known as the OBDD, indicate that it is an unstable structure in diblock melts. Earlier approximation schemes used to examine mean-field behavior are reviewed, and comparisons are made with our more accurate calculation.

Original language	English (US)
Pages (from-to)	1091-1098
Number of pages	8
Journal	Macromolecules
Volume	29
Issue number	4
DOIs	https://doi.org/10.1021/ma951138i
State	Published - Jan 1 1996

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10.1021/ma951138i

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abstract = "A mean-field phase diagram for conformationally symmetric diblock melts using the standard Gaussian polymer model is presented. Our calculation, which traverses the weak- to strong-segregation regimes, is free of traditional approximations. Regions of stability are determined for disordered (DIS) melts and for ordered structures including lamellae (L), hexagonally packed cylinders (H), body-centered cubic spheres (QIm{\=3}m), close-packed spheres (CPS), and the bicontinuous cubic network with Ia{\=3}d symmetry (QIa{\=3}d). The CPS phase exists in narrow regions along the order-disorder transition for χN ≥ 17.67. Results suggest that the QIa{\=3}d phase is not stable above χN above χN approx. 60. Along the L/QIa{\=3}d phase boundaries, a hexagonally perforated lamellar (HPL) phase is found to be nearly stable. Our results for the bicontinuous Pn{\=3}m cubic (QPn{\=3}m) phase, known as the OBDD, indicate that it is an unstable structure in diblock melts. Earlier approximation schemes used to examine mean-field behavior are reviewed, and comparisons are made with our more accurate calculation.",

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N2 - A mean-field phase diagram for conformationally symmetric diblock melts using the standard Gaussian polymer model is presented. Our calculation, which traverses the weak- to strong-segregation regimes, is free of traditional approximations. Regions of stability are determined for disordered (DIS) melts and for ordered structures including lamellae (L), hexagonally packed cylinders (H), body-centered cubic spheres (QIm3̄m), close-packed spheres (CPS), and the bicontinuous cubic network with Ia3̄d symmetry (QIa3̄d). The CPS phase exists in narrow regions along the order-disorder transition for χN ≥ 17.67. Results suggest that the QIa3̄d phase is not stable above χN above χN approx. 60. Along the L/QIa3̄d phase boundaries, a hexagonally perforated lamellar (HPL) phase is found to be nearly stable. Our results for the bicontinuous Pn3̄m cubic (QPn3̄m) phase, known as the OBDD, indicate that it is an unstable structure in diblock melts. Earlier approximation schemes used to examine mean-field behavior are reviewed, and comparisons are made with our more accurate calculation.

AB - A mean-field phase diagram for conformationally symmetric diblock melts using the standard Gaussian polymer model is presented. Our calculation, which traverses the weak- to strong-segregation regimes, is free of traditional approximations. Regions of stability are determined for disordered (DIS) melts and for ordered structures including lamellae (L), hexagonally packed cylinders (H), body-centered cubic spheres (QIm3̄m), close-packed spheres (CPS), and the bicontinuous cubic network with Ia3̄d symmetry (QIa3̄d). The CPS phase exists in narrow regions along the order-disorder transition for χN ≥ 17.67. Results suggest that the QIa3̄d phase is not stable above χN above χN approx. 60. Along the L/QIa3̄d phase boundaries, a hexagonally perforated lamellar (HPL) phase is found to be nearly stable. Our results for the bicontinuous Pn3̄m cubic (QPn3̄m) phase, known as the OBDD, indicate that it is an unstable structure in diblock melts. Earlier approximation schemes used to examine mean-field behavior are reviewed, and comparisons are made with our more accurate calculation.

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Unifying weak- and strong-segregation block copolymer theories

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