Multicritical Phenomena and Microphase Ordering in Random Block Copolymers Melts

Glenn H. Fredrickson, Scott T. Milner, Ludwik Leibler

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232 Scopus citations


A mean-field analysis of microphase separation and phase behavior is described for melts of linear A-B multiblock copolymers, each chain consisting of a stochastic sequence of flexible segments (each with M monomers), AM and BM, for a total of Q ≫ 1 segments per chain. We find a phase diagram similar to that for statistical A-B copolymers (M = 1) but with an isotropic Lifshitz point that should be accessible for a wide variety of materials. Due to the broad distribution of sequence lengths of like monomers, the microphases are predicted to lack long-range order and to exhibit unusual temperature sensitivity at the order-disorder transition. This may open the way to a novel class of polyurethanes and thermoplastic elastomers.

Original languageEnglish (US)
Pages (from-to)6341-6354
Number of pages14
Issue number23
StatePublished - Nov 1 1992

All Science Journal Classification (ASJC) codes

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry


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