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Authors
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Duan, Y. ; Rettler, E. ; Schneider, K. ; Schlegel, R. ; Thunga, M. ; Weidisch, R. ; Siesler, H.W. ; Stamm, M. ; Mays, J.W. ; Hadjichristidis, N.
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Title
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Deformation behavior of sphere-forming trifunctional multigraft copolymer
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Date
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20.06.2008
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Number
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16502
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Abstract
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Recently, a series of multigraft (MG) polystyrene-g-polyisoprene (PS-g-PI) copolymers, with controlled molecular weight of the backbone and the graft arm, the arm polydispersity, number of branch points, and the number of arms grafted to each branch point, were synthesized successfully by Mays et al.58 Preliminary studies have shown that multigraft PS-g-PI copolymers with ca. 20 wt % PS, and regular spaced junction points, without respect to different functionality (tri-, tetra-, and hexafunctionality) and microphase morphology (PS spheres, cylinders, and lamella) have exceptional elasticity compared to commercial thermoplastic elastomers (TPE).13 Multigraft copolymers stretched up to about 1400% show a residual strain of 40% only, not yet reached by any TPE. For understanding the origin or mechanism of such exceptional elasticity, named as superelasticity, more detailed studies are required. In this paper we studied the deformation behavior of sphere-forming trifunctional MG copolymer by synchrotron SAXS and rheo-optical FT-IR on nanometer size scales and molecular level, respectively.
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Publisher
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Macromolecules
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Wikidata
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Citation
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Macromolecules 41 (2008) 4565-4568
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DOI
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https://doi.org/10.1021/ma801036y
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Tags
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model graft-copolymers x-ray-scattering triblock copolymer tensile deformation branch-points morphology elongation
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