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Mechanical properties of weakly segregated block copolymers : 1. Synergism on tensile properties of poly(styrene-b-n-butylmethacrylate) diblock copolymers

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Author: Weidisch, R. · Michler, G.H. · Fischer, H. · Arnold, M. · Hofmann, S. · Stamm, M.
Type:article
Date:1999
Institution: Technisch Physische Dienst TNO - TH
Source:Polymer, 5, 40, 1191-1199
Identifier: 234958
doi: doi:10.1016/S0032-3861(98)00196-7
Keywords: Block copolymers · Mechanical properties · Structure · Composition effects · Deformation · Energy absorption · Interfaces (materials) · Molecular structure · Morphology · Polyacrylates · Polystyrenes · Strain · Tensile strength · Polybutylmethacrylate · Block copolymers

Abstract

Mechanical properties of poly(styrene-b-n-butylmethacrylate) diblock copolymers, PS-b-PBMA, with different lengths of the polystyrene block were investigated. The copolymers display a composition range where the tensile strength of the block copolymers exceeds the values of the corresponding homopolymers. At a PS-content of 74 vol% not only the tensile strength but also the strain at break is higher than that of pure polystyrene. Furthermore, the absorbed energy shows a maximum at a polystyrene content of 29 vol%. This composition reveals a morphology of hexagonally packed PS-cylinders which turns out to be effective for the increase of toughness in PS-b-PBMA diblock copolymers. The improved mechnical properties of PS-b-PBMA diblock copolymers are discussed with respect to a possible correlation and synergism between phase behaviour, morphology, deformation mechanism, and interface formation. © 1998 Elsevier Science Ltd.