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- W1969521285 abstract "Abstract Proton spin-spin relaxation curves for liquid polymers have been used to obtain information on molecular weight, entanglement and crosslink density. Previous results obtained with polydimethylsiloxanes show characteristic proton decay curves which can either have a single exponential (T2L) for low molecular material, or a double exponential with an additional component (T2S) related to the crosslinked and entangled density in network material where present. These investigations have been extended to polyethylene of various molecular weights and degrees of branching. For very high molecular weight polyethylene where no significant non-network component should be present, the relaxation curve is not purely exponential, but can be represented by an equation A(t) A(0) = a exp ( − t T a ) + b exp ( − t T b ) with only two independent parameters (a + b = 1; T b T a ≈ 0.28 ) . Crosslinking by irradiation causes a decrease in the time constants and in the longer component b. Radiation in the presence of oxygen gives an additional, long-time component, ascribed to radiation-induced scission which provides a low molecular weight component. These measurements can be used to characterize polyethylenes, and may lead to information on their morphology." @default.
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- W1969521285 date "1978-01-01" @default.
- W1969521285 modified "2023-09-27" @default.
- W1969521285 title "Study of very high molecular weight polyethylene using pulsed NMR techniques" @default.
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- W1969521285 doi "https://doi.org/10.1016/0146-5724(78)90049-3" @default.
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