Microphase segregation of diblock copolymers studied by the self-consistent field theory of Scheutjens and Fleer

Merve Mocan, Marleen Kamperman, Frans A.M. Leermakers*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

4 Citations (Scopus)

Abstract

We used the self-consistent field (SCF) formalism of Scheutjens and Fleer (SF-SCF) to complement existing theoretical investigations on the phase behavior of block copolymer melts. This method employs the freely jointed chain (FJC) model for finite chain length and systematic differences exist compared to the classical SCF predictions. We focus on the critical and hexagonal (HEX) to lamellar (LAM) phase transition region at intermediate and strong segregations. Chain length (N) dependence of the critical point (Χcr) was found to be ΧcrN = 10.495(1 + 4/N). The characteristic spacing (D) of LAM was found as D = 4/3 p N at the critical conditions. We present SF-SCF predictions for the phases single gyroid (SG), double gyroid (DG) and hexagonally perforated lamellar (HPL), in the region where HEX and LAM compete. At ΧN = 30, N = 300; we found SG and HPL were metastable with respect to LAM or HEX, DG was stable in a narrow region of the asymmetry ratio. In contrast to the latest predictions, at strong segregation ΧN = 120, DG was found to be metastable. From the structural evolution of HPL, we speculate that this may be an intermediate phase that allows the system to go through various connectivity regimes between minority and majority blocks.
Original languageEnglish
Article number78
JournalPolymers
Volume10
Issue number1
DOIs
Publication statusPublished - 17 Jan 2018

Keywords

  • Block copolymers
  • Microphase segregation
  • Self-consistent field theory

Fingerprint Dive into the research topics of 'Microphase segregation of diblock copolymers studied by the self-consistent field theory of Scheutjens and Fleer'. Together they form a unique fingerprint.

  • Cite this