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Glass transition of an amphiphilic random copolymer and relation to the Ising model of spin-glass

A. Moskalenko, Yu. A. Kuznetsov and K. A. Dawson

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We present the results of our study of the freezing transition of an amphiphilic random copolymer. We here confirm that a replica variational approach predicts a "scale"-dependent freezing transition due to the connectivity of the chain. In addition we suggest that two systems, a random copolymer and an Ising spin-glass, can be directly related to each other on the mean-field level in the vicinity of the freezing transition. Both systems have the same type of effective free energy. The properties of replica symmetrical (RS) and replica symmetry broken (RSB) solutions are discussed. The latter has larger radius of gyration and effective free energy, and is less phase separated. It might be related to a globule with more than one hydrophobic core.


PACS

36.20.Ey Conformation (statistics and dynamics)

64.70.Pf Glass transitions

Subjects

Soft matter, liquids and polymers

Atomic and molecular physics

Condensed matter: structural, mechanical & thermal

Dates

Issue 2 (15 October 1997)

Received 4 April 1997, accepted for publication 4 September 1997, in final form 4 September 1997



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