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- W2003444877 abstract "The utility of two-dimensional wideline separation (2D WISE) NMR in following the phase dependence of the radiation-induced crosslinking of multiphase materials has been demonstrated. Crosslink production in semicrystalline polyolefins by high-energy electron irradiation in air was monitored via the experimentally resolved 1H lineshapes of the respective amorphous and crystalline regions. It was shown that radiation-induced crosslinks can be primarily restricted to one phase or the other by proper functionalization, or nonfunctionalization, of the host polymer. Poly(1,23-tetracosadiyne), a diacetylene-functionalized polyethylene, was synthesized and shown to predominantly undergo crystalline-phase crosslinking for dosages of 100 kGy and less. Thus, chain mobility within amorphous regions may be maintained upon radiation-induced crosslinking. In comparison, linear polyethylene exhibited amorphous-phase crosslinking for electron beam radiation dosages of at least 400 kGy; application of 2D WISE NMR represents a direct method for following this well-known process." @default.
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- W2003444877 date "1994-05-01" @default.
- W2003444877 modified "2023-09-26" @default.
- W2003444877 title "Phase-restricted radiation crosslinking in semicrystalline polyolefins investigated by two-dimensional solid-state nuclear magnetic resonance" @default.
- W2003444877 doi "https://doi.org/10.1002/macp.1994.021950502" @default.
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