Destruction of polyamides in aggressive media

Nechaev, P. P.; Moiseev, Yu. V.; Заиков, Г. Е.; Petrova, T.

doi:10.1007/bf00855650

Cited by 4 publications

(4 citation statements)

References 13 publications

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“…In this work, nylon 6 was dissolved in different concentrations of various acids such as formic acid, hydrochloric acid, and sulfuric acid, and this was followed by the heating of the solutions under reflux for different times. Zaikov and coworkers 9,10 carried out kinetic studies on the breakdown of nylon 6 by hydrolysis in an aqueous solution of sulfuric acid. Because of heating, long-chain polymeric molecules became hydrolyzed, and chain scission took place.…”

Section: Resultsmentioning

confidence: 99%

Depolymerization of nylon 6 waste fibers

Shukla

Harad

Mahato

2006

J of Applied Polymer Sci

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ABSTRACT:The depolymerization of nylon 6 was carried out with various solvents, such as formic acid, hydrochloric acid, and sulfuric acid, followed by heating under reflux for different times. From the polymer dissolved and refluxed in formic acid, degradation products with different ranges of molecular weights were collected by fractional precipitation, with small lots of distilled water added as a nonsolvent. The characterization of different fractions was carried out by the measurement of the viscosity-average molecular weight, the number-average molecular weight, and the number of amino end groups. The presence of the monomer, aminocaproic acid, was confirmed by thin-layer chromatography in the case of hydrochloric acid treated nylon 6. With a strongly acidic ion-exchange resin, the monomer was separated in its purest form, and the melting point was noted.

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Section: Resultsmentioning

confidence: 99%

Depolymerization of nylon 6 waste fibers

Shukla

Harad

Mahato

2006

J of Applied Polymer Sci

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“…and Equation (8), (9), (11 and Equation (8), (9), (11). The values of the rate constants were obtained by solving these equations by the Runge-Kutta fourth-order numerical integration combined with Nelder's simplex method.…”

Section: Resultsmentioning

confidence: 99%

“…The very slow hydrolysis of the cyclic dimer, as compared to the cyclic trimer or poly(6-hexanelactam), was explained [9] by a high conformational stability of its fourteen-membered cycle and by the mutual electrostatic effect of the two amide groups. It is the aim of the present paper to compare the rates of the acidolysis of 6-hexanelactam and its nearest homologues, i. e. the corresponding cyclic dimer and trimer, in anhydrous acetic acid as the medium.…”

Section: Introductionmentioning

confidence: 99%

“…The reactivity of the 6-hexanelactam cyclic oligomers is usually supported by their rate of acid hydrolysis. [8] The tendency of the cycles to be hydrolyzed, expressed by the values of the corresponding rate constants, decreases in the order: monomer S trimer A tetramer S dimer The very slow hydrolysis of the cyclic dimer, as compared to the cyclic trimer or poly(6-hexanelactam), was explained [9] by a high conformational stability of its fourteen-membered cycle and by the mutual electrostatic effect of the two amide groups. It is the aim of the present paper to compare the rates of the acidolysis of 6-hexanelactam and its nearest homologues, i. e. the corresponding cyclic dimer and trimer, in anhydrous acetic acid as the medium.…”

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confidence: 99%

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