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- W2065342137 abstract "Symmetric poly(ethylene oxide-b-styrene-b-isoprene-b-styrene-b-ethylene oxide) (OSISO) pentablock terpolymers with narrow molecular weight distributions in all blocks were synthesized by anionic polymerization. These OSISO pentablock terpolymers have a common poly(styrene-b-isoprene-b-styrene) (SIS) core containing equal volume fractions of polyisoprene and polystyrene but having different lengths of terminal poly(ethylene oxide) (PEO) chains. Small-angle X-ray scattering, transmission electron microscopy, dynamic mechanical spectroscopy, and differential scanning calorimetry were used to identify two-domain lamellae, O70 (the orthorhombic Fddd network), and three-domain lamellae (LAM3) in the OSISO materials; these morphologies were previously identified in poly(isoprene-b-styrene-b-ethylene oxide) (ISO) triblock terpolymers with comparable compositions. Mechanical tensile testing was employed to probe the consequences of adding different lengths of semicrystalline PEO to the ends of intrinsically tough SIS triblock. An OSISO sample with the LAM3 mesostructure fractured in a brittle fashion at a strain of 0.06 while an OSISO containing the O70 network, in contrast, had a strain at failure of 1.3, even though the crystallinity of the terminal PEO blocks was above the brittle threshold established in other multiblock materials. This improved toughness is attributed to the combined effects of a triply continuous morphology and an intrinsically tough SIS core." @default.
- W2065342137 created "2016-06-24" @default.
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- W2065342137 creator A5069824583 @default.
- W2065342137 date "2008-07-19" @default.
- W2065342137 modified "2023-10-17" @default.
- W2065342137 title "Structure and Mechanical Properties of an O<sup>70</sup> (<i>Fddd</i>) Network-Forming Pentablock Terpolymer" @default.
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- W2065342137 doi "https://doi.org/10.1021/ma800885s" @default.
- W2065342137 hasPublicationYear "2008" @default.
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