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Authors
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Ganß, M. ; Satapathy, B. K. ; Thunga, M. ; Weidisch, R. ; Knoll, K.
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Title
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Molecular-weight-controlled brittle-to-semiductile-o-ductile transition in S-(S/B)-S triblock copolymers
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Date
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12.02.2010
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Number
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52470
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Abstract
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Toughness enhancement of S-(S/B)-S triblock copolymers via a molecular-weight-controlled pathway is demonstrated. The post-yield crack toughness behavior of the triblock copolymers uniquely reveal a brittle-to-semiductile-to-ductile transition with increasing equation image while keeping the basic molecular architecture fixed. TEM and SAXS investigations indicated three distinct morphologies as a function of ·effN as a consequence of the increase in equation image: (i) a homogeneous structure without phase-separation, (ii) a weakly segregated structure, and (iii) a lamellar structure. The increase in crack toughness is also reaffirmed from kinetic and strain field analysis studies concerning dynamics of crack growth in block copolymers with high PS content.
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Publisher
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Macromolecular Materials and Engineering
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Wikidata
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Citation
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Macromolecular Materials and Engineering 295 (2010) 178-188
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DOI
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https://doi.org/10.1002/mame.200900259
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Tags
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