Results 121 to 130 of about 2,853 (179)
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Journal of Polymer Science Part C: Polymer Symposia, 1967
AbstractAccording to the accepted mechanism of the anionic polymerization of 6‐caprolactam the chain growth proceeds through addition of lactam anion to the imide group. For the evaluation of rate constants it is necessary to know the concentration of lactam anions in the reaction system.
E. Šittler, J. Šebenda
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AbstractAccording to the accepted mechanism of the anionic polymerization of 6‐caprolactam the chain growth proceeds through addition of lactam anion to the imide group. For the evaluation of rate constants it is necessary to know the concentration of lactam anions in the reaction system.
E. Šittler, J. Šebenda
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Macromolecular Symposia, 1996
AbstractThe anionic polymerization of ∈‐caprolactam initiated with magnesium initiators was studied in the interval 180–250°C. ∈‐Caprolactam magnesium bromide was much more active than magnesium di(∈‐caprolactamate) and the activity of both depended on the way of their preparation.
Václava Nováková +4 more
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AbstractThe anionic polymerization of ∈‐caprolactam initiated with magnesium initiators was studied in the interval 180–250°C. ∈‐Caprolactam magnesium bromide was much more active than magnesium di(∈‐caprolactamate) and the activity of both depended on the way of their preparation.
Václava Nováková +4 more
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The genetic toxicology of benzoin and caprolactam
Mutation Research/Genetic Toxicology, 1989A summary is presented of the published literature on the genetic toxicology of the two rodent non-carcinogens benzoin and caprolactam.
A L, Brady, H F, Stack, M D, Waters
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Disposition of [14C]caprolactam in the rat
Food and Cosmetics Toxicology, 1981Abstract The tissue distribution and excretion of [ carbonyl - 14 C]caprolactam was studied in male Fischer 344 rats given a single oral dose of 0·18 mg/kg body weight. After 24 hr, 77·6% of the administered radioactivity had been excreted in the urine, 3·5% in the faeces and 1·5% in the expired air of the animals. Elimination of radioactivity in the
P D, Unger, A J, Salerno, M A, Friedman
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Journal of Polymer Science, 1959
AbstractThe equilibrium resulting from the water initiated polymerization of caprolactam has been investigated for initial water concentrations (w) in the range, 0.01 ≤ w ≤ 1 (moles H2O/mole caprolactam) at temperatures 220, 235, 250, and 265°C. Based upon the postulate that, at a given temperature, the degree of polymerization is directly proportional
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AbstractThe equilibrium resulting from the water initiated polymerization of caprolactam has been investigated for initial water concentrations (w) in the range, 0.01 ≤ w ≤ 1 (moles H2O/mole caprolactam) at temperatures 220, 235, 250, and 265°C. Based upon the postulate that, at a given temperature, the degree of polymerization is directly proportional
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The vapor-liquid state of caprolactam-water and caprolactam-water-nitrogen systems
Fibre Chemistry, 1993The vapor-liquid state of the CL-H2O system in a wide range of temperatures was determined based on the thermodynamic characteristics of CL (caprolactam). The vapor-liquid state of the open system CL-H2O-N2 was investigated, and a method for calculating this state was proposed.
I. M. Vlasov +3 more
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Polymerization of caprolactam. Part IV. Stannic chloride ‐ caprolactam complex
Die Makromolekulare Chemie, 1967AbstractSnCl4 forms a 1:2 molar complex with caprolactam, and the role of this complex in initiating the polymerization of caprolactam has been studied. At the temperature of polymerization, the complex decomposes with the evolution of two moles of HCl per mole of complex.
A. J. Amass, J. N. Hay
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Anionic polymerization of caprolactam. Optimization of the system NaH/N‐benzoyl caprolactam
Die Angewandte Makromolekulare Chemie, 1976AbstractThe effects of changes in concentration of sodium hydride as catalyst, and N‐benzoyl caprolactam as cocatalyst upon the polymerization of ε‐caprolactam were studied. The effects were monitored as changes in the intrinsic viscosity of the resultant polymer determined in m‐cresol at 25°C.
J. A. Moore, T. J. Pahls
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Suspension polymerization of caprolactam
Journal of Applied Polymer Science, 1965AbstractThe anionic polymerization of caprolactam (with sodium hydride and acetyl caprolactam as catalysts) carried out in glass ampules is reported. The effect of the catalyst concentration, polymerization temperature, and other variables was studied. Polymerization of caprolactam at temperatures around 120°C.
G. B. Gechele, G. F. Martinis
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Cationic polymerization of caprolactam
European Polymer Journal, 1968Abstract The theories on the cationic polymerization of caprolactam, at temperatures above the melting point of the polymer, are compared and discussed. The results of fractionations and molecular weight distributions, carried out on polymers prepared with caprolactam hydrochloride as initiator under anhydrous conditions, are used as the basis of the
G.B. Gechele, G. Stea, F. Manescalchi
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