Orthorhombic Fddd Network in Diblock Copolymer Melts

By M. Takenaka, Tsutomu Wakada, S. Akasaka, S. Nishitsuji, K. Saijo, H. Shimizu, H. Hasegawa. 2006

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For the first time a Fddd network structure is found in a poly(styrene-b-isoprene) (S-I) diblock copolymer melts by using small-angle X-ray scattering and transmission electron microscope, as predicted by Tyler et al. by using calculations with self-consistent field theory for diblock copolymer melts. The phase diagram of the S-I exhibits the sequence of Disorder- Fddd-Lamellae with decreasing temperature. The measured unit cell parameters ratios (a,b,c) are (1:2.02:3.46), which agrees with the result of the theoretical calculation.

Subfields: Electrical and Electronic Engineering, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/5bfe3ac2a17b71b2bf8578b5b54040c92af2f564