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Journal of Chemical Physics / Volume 117 / Issue 22 / ARTICLES / Polymers, Biopolymers, and Complex Systems

J. Chem. Phys. 117, 10315 (2002); http://dx.doi.org/10.1063/1.1519537 (6 pages)

Theory of T junctions and symmetric tilt grain boundaries in pure and mixed polymer systems

Daniel Duque, K. Katsov, and M. Schick

Department of Physics, University of Washington, Seattle, Washington, 98195-1560

(Received 29 July 2002; accepted 16 September 2002)

We apply self-consistent-field theory to T junctions and symmetric tilt grain boundaries in block copolymer systems with and without the addition of homopolymer. We find that, in the absence of homopolymer, T junctions have a larger free energy per unit area than that of the symmetric tilt junctions with which they compete except for a range of angles between about 100° and 130°. With the addition of homopolymer, this range increases. These results are quite consistent with experiment. As the angle between grains increases towards 180°, the T junction undergoes a morphological change somewhat similar to that which occurs in symmetric tilt grain boundaries. At the onset of this change, the free energy per unit area decreases markedly. © 2002 American Institute of Physics.

© 2002 American Institute of Physics

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KEYWORDS and PACS

Keywords

polymer blends, free energy, grain boundaries, tilt boundaries, polymer structure

PACS

  • 61.41.+e

    Polymers, elastomers, and plastics

  • 65.60.+a

    Thermal properties of amorphous solids and glasses: heat capacity, thermal expansion, etc.

  • 61.72.Mm

    Grain and twin boundaries

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.1519537

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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