Title
Mechanical Properties of Weakly Segregated Block Copolymers. 3. Influence of Strain Rate and Temperature on Tensile Properties of Poly(styrene-b-butyl methacrylate) Diblock Copolymers with Different Morphologies
Author
Weidisch, R.
Stamm, M.
Michler, G.H.
Fischer, H.R.
Jérôme, R.
Technisch Physische Dienst TNO - TH
Publication year
1999
Abstract
Poly(styrene-b-butyl methacrylate) diblock copolymers, PS-6-PBMA, with different morphologies are investigated with respect to the influence of strain rate and temperature on tensile properties. In the first part the mechanical properties of bicontinuous and perforated lamellar structure are compared with other morphologies. Diblock copolymers with bicontinuous structures (39% PS) show a much higher tensile strength as well as a higher strain at break than diblock copolymers with lamellar structures (50% PS). In the second part the dependence of tensile properties on strain rate and temperature are discussed for different morphologies. A diblock copolymer with a polystyrene content of 76% PS reveals hexagpnally packed PBMA-cylinder, and the tensile strength, strain at break, and Young's modulus exceed the values of pure polystyrene at all measured strain rates. The interesting properties of PS-b-PBMA diblock copolymers are discussed with respect to the phase behavior, interface formation, and chain conformation.
Subject
Conformations
Elastic moduli
Interfaces (materials)
Molecular structure
Morphology
Polyacrylates
Polystyrenes
Strain measurement
Strain rate
Tensile strength
Thermal effects
Polybutyl methacrylate
Block copolymers
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TNO identifier
234940
ISSN
0024-9297
Source
Macromolecules, 32 (3), 742-750
Document type
article