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

Journal Article · Tue Jul 01 00:00:00 EDT 1997 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.79.237· OSTI ID:587191

Mansky, P; Russell, T P ^[1]; Hawker, C J ^[2]; Mays, J; Cook, D C ^[3]; Satija, S K ^[4]

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

The response of disordered P({ital d}-S-{ital b}-MMA) diblock copolymers to variable strength surface fields has been studied by neutron reflectivity. Surface interactions were controlled by end grafting P(S-{ital 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 {ital simultaneously} at the vacuum and substrate interfaces. {copyright} {ital 1997} {ital The American Physical Society}

• OSTI ID: 587191
• Journal Information: Physical Review Letters, Vol. 79, Issue 2; Other Information: PBD: Jul 1997
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
66 PHYSICS
COPOLYMERS
INTERFACES
SEGREGATION
SURFACE POTENTIAL
NEUTRON DIFFRACTION
STYRENE
METHACRYLIC ACID ESTERS
PHASE TRANSFORMATIONS