Block copolymer mixtures as revealed by neutron reflectivity

Journal Article · Sun Dec 04 23:00:00 EST 1994 · Macromolecules; (United States)

DOI:https://doi.org/10.1021/ma00103a030· OSTI ID:6870656

Mayes, A M ^[1]; Russell, T P; Deline, V R ^[2]; Satija, S K; Majkrzak, C F ^[3]

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1. Massachusetts Inst. of Technology, Cambridge, MA (United States). Dept. of Materials Science and Engineering
2. IBM Research Division, San Jose, CA (United States). Almaden Research Center
3. National Inst. of Standards and Technology, Gaithersburg, MD (United States). Reactor and Radiation Division

Thin film mixtures of high and low molecular weight symmetric poly(styrene-b-methyl methacrylate) diblock copolymers were investigated by neutron reflectivity. The preferential interaction of the block components with the surface and substrate causes the mixtures to organize upon annealing into alternating lamellar microdomains of PS and PMMA oriented parallel to the substrate surface. By deuterating the PMMA blocks of both mixture components, the periodicity and interfacial width were determined as a function of the mixture composition. The lamellar period, d, of the mixture was found to scale approximately with the number-average molecular weight as d [approximately] M[sub n][sup 2/3]. Via selective deuteration, the copolymer block distributions within the domains were obtained by combining results from complementary experiments. In all cases investigated, nonuniform profiles were observed whereby the shorter copolymer chains localized to the PS/PMMA interface regions while longer chains enriched the domain centers.

• DOE Contract Number: FG03-88ER45375
• OSTI ID: 6870656
• Journal Information: Macromolecules; (United States), Journal Name: Macromolecules; (United States) Vol. 27:25; ISSN MAMOBX; ISSN 0024-9297
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360602* -- Other Materials-- Structure & Phase Studies
CHEMICAL REACTIONS
COHERENT SCATTERING
COPOLYMERS
DEUTERATION
DIFFRACTION
ESTERS
MATERIALS
MICROSTRUCTURE
NEUTRON DIFFRACTION
ORGANIC COMPOUNDS
ORGANIC POLYMERS
PETROCHEMICALS
PETROLEUM PRODUCTS
PLASTICS
PMMA
POLYACRYLATES
POLYMERS
POLYOLEFINS
POLYSTYRENE
POLYVINYLS
SCATTERING
SYNTHETIC MATERIALS
USES