Phase behavior of cross-linked block copolymers

POSTER

Abstract

To study the order-disorder transition in cross-linked copolymer melts we have selectively cross-linked the polyisoprene chains in poly (styrene-block-isoprene) copolymers using high energy radiation. The temperature during irradiation was controlled to allow cross-linking in the ordered or disordered state. We present the phase behavior of block copolymers with either cylindrical or lamellar morphologies before and after the gelation point and compare the results for samples below the gelation point with a mean-field theory based on a coarse grained free energy and the Random Phase Approximation.

Authors

  • Hyeok Hahn

  • Enrique Gomez

    University of California, Berkeley

  • Jayajit Das

  • Arup Chakraborty

  • Nitash Balsara

    University of California, Berkeley, Lawrence Berkeley National Laboratory, University of California, Berkeley and Lawrence Berkeley National Laboratory, Univ. of California-Berkeley, University of California, Berkeley

  • Mark Ellsworth

    Tyco Electronics Corporation, Tyco Electronics