On the Nature of the Perforated Layer Phase in Undiluted Diblock Copolymers
- Creators
- Qi, Shuyan
- Wang, Zhen-Gang
Abstract
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.
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).Additional details
- Eprint ID
- 88029
- DOI
- 10.1021/ma970206t
- Resolver ID
- CaltechAUTHORS:20180719-153004411
- ASC-9217368
- NSF
- DMR-9531914
- NSF
- TC-96-063
- Camille and Henry Dreyfus Foundation
- BR-3508
- Alfred P. Sloan Foundation
- Created
-
2018-07-19Created from EPrint's datestamp field
- Updated
-
2021-11-16Created from EPrint's last_modified field