Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 533119
Title Microphase segregation of diblock copolymers studied by the self-consistent field theory of Scheutjens and Fleer
Author(s) Mocan, Merve; Kamperman, Marleen; Leermakers, Frans A.M.
Source e-Polymers 10 (2018)1. - ISSN 1618-7229
DOI http://dx.doi.org/10.3390/polym10010078
Department(s) VLAG
Physical Chemistry and Soft Matter
Publication type Refereed Article in a scientific journal
Publication year 2018
Keyword(s) Block copolymers - Microphase segregation - Self-consistent field theory
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.
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