Europhys. Lett.
Volume 76, Number 5, December 2006
Page(s) 959 - 964
Section Interdisciplinary physics and related areas of science and technology
Published online 08 November 2006
Europhys. Lett., 76 (5), pp. 959-964 (2006)
DOI: 10.1209/epl/i2006-10363-6

Phase transitions in block copolymers resulting in a discontinuous change of the spatial period of mesophases

S. Kuchanov1, 2, V. Pichugin1 and G. ten Brinke3

1  Polymers and Crystals Chair, Physics Department, Lomonosov Moscow State University - Vorobjevy gory, 119992 Moscow, Russia
2  Keldysh Institute of Applied Mathematics - Miusskaya Square 4 125047 Moscow, Russia
3  Department of Polymer Chemistry and Material Science Center University of Groningen - Nijenborgh 4, 9747 AG Groningen, The Netherlands

received 25 August 2006; accepted 12 October 2006
published online 8 November 2006

The phase behavior of a melt of two-scale multiblock copolymers has been theoretically studied in the framework of the Weak Segregation Limit theory with a two-component order parameter. The existence of a thermodynamically stable mesophase with two scales of the space periodicity has been revealed for a melt of monodisperse nonperiodic heteropolymers. For the first time a discontinuous change with temperature of the spatial period of the mesophases has been predicted.

82.35.Jk - Copolymers, phase transitions, structure.
64.10.+h - General theory of equations of state and phase equilibria.

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