We study the morphological transitions of microphase separated structures in diblock copolymers in the weak segregation regime. A general theory for the stability of the mesophases is presented in terms of the amplitude equation for periodic structures under the single-wave-number approximation. Simulations of morphological transitions in three dimensions are also presented. In particular, we show the time-evolution of domains in the transitions from a rhombohedral structure to a hexagonal structure. (C) 2002 Elsevier Science B.V. All rights reserved. [References: 26]
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