Block Copolymer Mixtures As Revealed By Neutron Reflectivity

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 alte...

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Bibliographic Details
Published in:Macromolecules 1994-12, Vol.27 (25), p.7447-7453
Main Authors: Mayes, A. M, Russell, T. P, Deline, V. R, Satija, S. K, Majkrzak, C. F
Format: Article
Language:English
Subjects:
Applied sciences
CHEMICAL REACTIONS
COHERENT SCATTERING
COPOLYMERS
DEUTERATION
DIFFRACTION
ESTERS
Exact sciences and technology
MATERIALS
MATERIALS SCIENCE
MICROSTRUCTURE
NEUTRON DIFFRACTION
ORGANIC COMPOUNDS
ORGANIC POLYMERS
PETROCHEMICALS
PETROLEUM PRODUCTS
Physicochemistry of polymers
PLASTICS
PMMA
POLYACRYLATES
POLYMERS
POLYOLEFINS
POLYSTYRENE
POLYVINYLS
Properties and characterization
SCATTERING
Structure, morphology and analysis
SYNTHETIC MATERIALS 360602 > Other Materials-- Structure & Phase Studies
USES
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Summary: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.
ISSN:0024-9297
1520-5835
DOI:10.1021/ma00103a030