Solubilization of a Homopolymer in a Block Copolymer

Blends containing styrene-butadiene diblock copolymer (50 wt % styrene content) and polystyrene of various molecular weights are studied by light scattering, transmission electron microscopy, and small-angle X-ray scattering. The solubility of polystyrene in the styrene domain of the block copolymer...

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Bibliographic Details
Published in:Macromolecules 1994-04, Vol.27 (9), p.2439-2447
Main Authors: Jeon, Kyung-Jin, Roe, Ryong-Joon
Format: Article
Language:English
Subjects:
360602 - Other Materials- Structure & Phase Studies
Applied sciences
COPOLYMERS
Exact sciences and technology
MATERIALS
MATERIALS SCIENCE
MATHEMATICAL MODELS
MORPHOLOGY
ORGANIC COMPOUNDS
ORGANIC POLYMERS
PETROCHEMICALS
PETROLEUM PRODUCTS
Physicochemistry of polymers
PLASTICS
POLYMERS
POLYOLEFINS
POLYSTYRENE
POLYVINYLS
Properties and characterization
SOLUBILITY
SOLVENT PROPERTIES
SYNTHETIC MATERIALS
Thermal and thermodynamic properties
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Summary:Blends containing styrene-butadiene diblock copolymer (50 wt % styrene content) and polystyrene of various molecular weights are studied by light scattering, transmission electron microscopy, and small-angle X-ray scattering. The solubility of polystyrene in the styrene domain of the block copolymer is governed by the ratio of the homopolymer molecular weight to the block molecular weight. A finite solubility limit exists when this ratio exceeds [approximately]1. The lamellar repeat period increases linearly as more polystyrene is added, but the butadiene layer thickness remains constant, signifying that the average interfacial area occupied by a copolymer junction point does not change with added polystyrene. This contrasts to the case found by the others that the average area per junction point increases when the added homopolymer is smaller than the block size. Small-angle X-ray scattering patterns obtained from samples having lamellar morphology are described by an idealized model in which layers of styrene and butadiene of randomly varying thicknesses with a diffuse interface between them are stacked parallel.
ISSN:0024-9297
1520-5835
DOI:10.1021/ma00087a012