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