Interfacial Segregation in Disordered Block Copolymers: Effect of Tunable Surface Potentials

P. Mansky; T. P. Russell; C. J. Hawker; J. Mays; D. C. Cook; S. K. Satija

doi:10.1103/PhysRevLett.79.237

Interfacial Segregation in Disordered Block Copolymers: Effect of Tunable Surface Potentials

P. Mansky, T. P. Russell, C. J. Hawker, J. Mays, D. C. Cook, and S. K. Satija

Phys. Rev. Lett. 79, 237 – Published 14 July 1997

Abstract

The response of disordered P(d-S-b-MMA) diblock copolymers to variable strength surface fields has been studied by neutron reflectivity. Surface interactions were controlled by end grafting P(S-r-MMA) random copolymers with various styrene contents onto Si substrates. The degree interfacial segregation of the block copolymer was proportional to the surface potential. A first-order transition in the degree of segregation was observed as the brush composition was varied. Conditions were found which yielded neutral boundary conditions simultaneously at the vacuum and substrate interfaces.

Received 30 January 1997

DOI:https://doi.org/10.1103/PhysRevLett.79.237

Authors & Affiliations

P. Mansky¹, T. P. Russell¹, C. J. Hawker², J. Mays³, D. C. Cook³, and S. K. Satija⁴

¹Polymer Science and Engineering Department, University of Massachusetts, Amherst, Massachusetts 01032
²IBM Almaden Research Center, San Jose, California 95120
³Department of Chemistry, University of Alabama at Birmingham, Birmingham, Alabama 3529
⁴National Institute of Standards and Technology, Gaithersburg, Maryland 20899