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- W2068277639 abstract "The molar cyclization equilibrium constants Kx for cyclics [NH(CH2)5CO]x with x = 1−6 were measured for an undiluted melt equilibrate of nylon-6 at 525K using gel permeation chromatography as the principal analytical technique. They were compared with the corresponding theoretical values calculated by the Jacobson and Stockmayer theory using the rotational isomeric state model of Flory and Williams to describe the statistical conformations of the corresponding open chain molecules. Ring-chain equilibration reactions were carried out on samples of nylon-6 at a temperature 46K below the melting point of the polymer. Polymers were prepared at 459K over periods of more than 30 days by (i) heating nylon-6 containing 11.5% w/w cyclic oligomers, (ii) heating nylon-6 containing no cyclic oligomers, (iii) polymerizing ϵ-caprolactam alone. These polymers were all found to contain ∼2% w/w cyclics [NH(CH2)5CO] with x = 1−6. However, although the concentrations of the larger cyclic oligomers were identical within experimental error in the samples prepared by (i) and (ii), they were strikingly different from those in the sample prepared by (iii). These differences in cyclic concentrations are discussed in terms of the structures of the solid polymers at the equilibration temperature." @default.
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- W2068277639 date "1974-07-01" @default.
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- W2068277639 title "Equilibrium ring concentrations and the statistical conformations of polymer chains: Part 12. Cyclics in molten and solid nylon-6" @default.
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- W2068277639 doi "https://doi.org/10.1016/0032-3861(74)90104-9" @default.
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