Electrolytic Interaction of Nylon with Aqueous Solutions of Hydrochloric Acid.

Wall, Frederick T.; Beresniewicz, A.

doi:10.1021/j150539a047

Cited by 16 publications

(2 citation statements)

References 1 publication

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“…28) In the concentrated hydrochloric acid solutions, nylon absorbs more acid than would be expected from the number of amino groups present. This excess absorption has been attributed to the interaction of the acid with amide linkages.…”

Section: Resultsmentioning

confidence: 99%

Surface Chemistry of the Polyamide Series. III. Monolayers of Nylons from ω-Aminocarboxylic Acids at the Air/Water Interface

Yamashita¹

1965

Bulletin of the Chemical Society of Japan

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The surface films of a series of nylons prepared from ω-aminocarboxylic acids and with 2 to 11 CH2 groups per monomer unit (Nylons 3 to 12) have been studied at the air/water interface in order to investigate the correlation of the film properties with the numbers of CH2 groups. The film of Nylon 9 at the oil/water interface and that of polynonamethylene urea at the air/water interface have also been studied. The film of Nylon 3 on the 40% ammonium sulfate subsolution was of the condensed type and the area occupied per residue was quite small, probably because of the especially strong hydrogen bonds between amide groups. On the other hand, the films of Nylons 4, 5 and 6 on 40% ammonium sulfate and that of Nylon 6 on distilled water were of the expanded type. These polymers might be spread in rather flexible states because of the effect of the increased number of CH2 groups. Nylons 8 to 12 and polyurea gave condensed films on distilled water, their limiting areas per residue being much smaller than the areas calculated for the fully extended chains. The condensation of the films might be primarily caused by the increased van der Waals attractive force between hydrocarbon groups, as has been proved by the remarkable expansion of Nylon 9 film at the petroleum ether/distilled water interface. The small limiting areas of these polymer films have been interpreted by assuming that the hydrocarbon chains are folded near these areas. Nylon 7 was found to give an intermediate film between expanded films, such as Nylons 4 to 6, and condensed films, such as Nylons 8 to 12. Interesting differences in the film properties of odd- and even-numbered nylons have been found with Nylons 8 to 12. Odd-numbered nylons occupied somewhat larger areas per residue than even-numbered nylons, and the maximum surface moments of the formers were higher than those of the latters. This is the result of the difference in shapes of the folded chains between the two series of nylons. The surface viscosities of Nylons 8 to 12, with the exception of the last, were first detected at larger areas than the close-packed areas calculated for the fully-extended chains. The areas found for even-numbered nylons were much smaller than those for odd-numbered ones. This may be attributed to the difference in modes of hydrogen bond formation between amide groups. A remarkable effect of the concentrated sulfuric acid subsolution on the film properties of Nylons 6 to 9 has been found, and interpreted as being due to the protonation to the amide linkages.

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Section: Resultsmentioning

confidence: 99%

Surface Chemistry of the Polyamide Series. III. Monolayers of Nylons from ω-Aminocarboxylic Acids at the Air/Water Interface

Yamashita¹

1965

Bulletin of the Chemical Society of Japan

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“…In reality, there will be a gradual transition from the first stage of titration of the excess of basic groups to the second stage of back titration of the ionized acidic groups, so that at best an inflexion in the sorption curve will be seen, rather than the clear plateaus at high P1 values in Figure 3. In addition, the onset of electrolyte sorption at high P1 values will further complicate the picture, 1-3,7 not to mention the possibility of protonation of the amide group^.^ Wall and Beresniewicz could find no satisfactory theoretical explanation of their experimental data for the first stage of the sorption of hydrochloric acid at 14°C for polyamide l. 7 These data have been plotted to the left in Figure 3 to make clear the deviations from the present model, and to avoid confusing the other data comparisons. To obtain the parameter estimates for KH * KD/ Ks in Table 111, the data were fitted to a curve for P5 = 0.19 at log 8, = -0.5, using the observation by Wall and Beresniewicz that only 84% of the acidic and basic groups are accessible to the acid.…”

Section: Pol Yamidesmentioning

confidence: 99%

Dimensionless groups for the description of sorption equilibria in dyeing with anionic dyes. I. Inorganic co‐ion exclusion

McGregor¹,

Iijima²

1990

J of Applied Polymer Sci

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SynopsisThe equations of a general Donnan Model have been simplified and used to describe the equilibrium sorption of anionic dyes by fibers containing acidic and basic groups. By examining simple situations, the dependence of the sorption behavior on specific dimensionless groups of variables has been clarified. This approach emphasizes common features of different ionic dyeing systems, it can be applied in graphical methods of data analysis, and it has potential applications in process control.

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Heats of Hydrogenation: A Brief Summary

Jensen

1976

Progress in Physical Organic Chemistry

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Electrolytic Interaction of Nylon with Aqueous Solutions of Hydrochloric Acid.

Cited by 16 publications

References 1 publication

Surface Chemistry of the Polyamide Series. III. Monolayers of Nylons from ω-Aminocarboxylic Acids at the Air/Water Interface

Surface Chemistry of the Polyamide Series. III. Monolayers of Nylons from ω-Aminocarboxylic Acids at the Air/Water Interface

Dimensionless groups for the description of sorption equilibria in dyeing with anionic dyes. I. Inorganic co‐ion exclusion

Heats of Hydrogenation: A Brief Summary

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