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Journal of Chemical Physics / Volume 129 / Issue 5 / ARTICLES / Polymers and Complex Systems

J. Chem. Phys. 129, 054904 (2008); http://dx.doi.org/10.1063/1.2962978 (6 pages)

Effects of interaction range and compressibility on the microphase separation of diblock copolymers: Mean-field analysis

Qiang Wang

Department of Chemical and Biological Engineering, Colorado State University, Fort Collins, Colorado 80523-1370, USA

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(Received 7 May 2008; accepted 30 June 2008; published online 4 August 2008)

Using the random-phase approximation and self-consistent field calculations, we have investigated the effects of finite interaction range and compressibility on the order-disorder transition (ODT) and the lamellar structure of symmetric diblock copolymers. While the compressibility does not affect the ODT, both the values of χN and bulk lamellar period at the ODT increase with increasing interaction range. On the other hand, both the free-energy density and bulk period of the lamellae increase with either increasing interaction range or decreasing compressibility. Even with a finite compressibility, the mean-field ODT is still a second-order phase transition. The scaling exponent of bulk lamellar period with χN, however, decreases with increasing compressibility. Our mean-field analysis provides a well understood reference for the study of fluctuation effects in diblock copolymers with finite interaction range and compressibility.

© 2008 American Institute of Physics

Article Outline

  1. INTRODUCTION
  2. THEORETICAL FORMALISM
    1. Field theory
    2. Random-phase approximation
    3. Self-consistent field equations
  3. RESULTS AND DISCUSSION
  4. SUMMARY

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KEYWORDS and PACS

Keywords

compressibility, free energy, order-disorder transformations, polymer blends, polymer structure, RPA calculations, SCF calculations

PACS

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.2962978

PUBLICATION DATA

ISSN

0021-9606 (print)  
1089-7690 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

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