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On the Nature of the Perforated Layer Phase in Undiluted Diblock Copolymers

Qi, Shuyan and Wang, Zhen-Gang (1997) On the Nature of the Perforated Layer Phase in Undiluted Diblock Copolymers. Macromolecules, 30 (15). pp. 4491-4497. ISSN 0024-9297. doi:10.1021/ma970206t.

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The nature, stability, and mechanism of formation of the block copolymer perforated lamellar structure are elucidated. This structure is shown to develop from the anisotropic fluctuations of the lamellar phase when it reaches its spinodal. It is proposed that there can be two different perforated lamellar structures, one based on a hexagonal close packed (hcp) lattice and one based on a body-centered cubic (bcc) lattice, with nearly degenerate free energy. In the framework of a Leibler-type free energy functional, it is shown that the perforated lamellar structure is only pseudostable (corresponding to a saddle point in the free energy surface) in the weak-segregation limit but can become metastable in the intermediate-segregation regime. Calculation of the fluctuation spectrum of metastable perforated lamellar structures enables us to explain in a simple and consistent manner several puzzling structural data from small-angle neutron scattering studies.

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Wang, Zhen-Gang0000-0002-3361-6114
Additional Information:© 1997 American Chemical Society. Received February 13, 1997; Revised Manuscript Received May 1, 1997. We thank F. S. Bates, D. A. Hajduk, and E. L. Thomas for helpful discussions. This research is supported in part by the National Science Foundation (Grant Nos. ASC-9217368 and DMR-9531914), the Camille and Henry Dreyfus Foundation (Award No. TC-96-063), and the Alfred P. Sloan Foundation (Award No. BR-3508).
Funding AgencyGrant Number
Camille and Henry Dreyfus FoundationTC-96-063
Alfred P. Sloan FoundationBR-3508
Issue or Number:15
Record Number:CaltechAUTHORS:20180719-153004411
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Official Citation:On the Nature of the Perforated Layer Phase in Undiluted Diblock Copolymers Shuyan Qi and Zhen-Gang Wang Macromolecules 1997 30 (15), 4491-4497 DOI: 10.1021/ma970206t
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:88029
Deposited By: George Porter
Deposited On:19 Jul 2018 22:43
Last Modified:16 Nov 2021 00:23

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