Ultrasonic degradation of polycaproamide in 40% sulfuric acid solution

Szorek, Ryszard

doi:10.1002/pol.1979.180170603

Cited by 4 publications

(2 citation statements)

References 11 publications

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“…Degradation as well as depolymerisation occurs as a result of elongational flow fields, thus producing a less viscous polymer [22]. The rate of degradation increased with an increase in ultrasonic power [48][49][50].…”

Section: Chemical Effectsmentioning

confidence: 99%

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Input power-mechanism relationship for ultrasonic Irradiation: Food and polymer applications

Kasaai¹

2013

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Mechanisms for interactions between ultrasound waves and materials vary as a function of input power of ultrasound. The objectives of this study were to compare mode of actions for ultrasound waves at different input powers. This study also describes various effects of ultrasound on materials at different input powers with emphasize on food and polymer applications. At low power of ultrasound, the major mechanism is acoustic streaming and at a power above threshold value, the most possible one is acoustic cavitation. Low power of ultrasound is a powerful analytical technique to investigate on physico-chemical properties of both biological and non-biological materials. While at sufficiently high power, it generates shear forces that are able to create different effects. For each pair of medium-acoustic wave, two types of mechanisms, acoustic streaming and cavitation may be occurred simultaneously.

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Section: Chemical Effectsmentioning

confidence: 99%

“…The effects of ultrasonic power on degradation of hydroxyethyl cellulose and poly (ethylene oxide) in aqueous solutions [49,50,52] were investigated. They reported that the efficiency and rate of degradation process increased with an increase in ultrasonic power.…”

Section: Chemical Effectsmentioning

confidence: 99%

Input power-mechanism relationship for ultrasonic Irradiation: Food and polymer applications

Kasaai¹

2013

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Ultrasonic mechanochemical degradation of the ternary copolymer poly(acrylonitrile‐co‐vinyl acetate‐co‐α‐methylstyrene)

Oprea¹,

Popa²

1991

Acta Polymerica

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The ultrasonic mechanochemical degradation of poly(acrylonitri1e-co-vinyl acetate-co-a-methylstyrene) in solution is studied. Based on an experimental design whose results were processed on a computer, the function correlating the intensity of mechanodegradation with the reaction parameters concentration, temperature, and duration was obtained. The radicalic mechanism of the mechanochemical degradation was proved. Durch Ultraschall bewirkter mechanochemischer Abbau des terniiren Copolymers Poly (acrylnitril-co-vinylacetat-co-a-methylstyren)Der mechanochemische Abbau von Poly(acrylnitril-co-vinylacetat-co-a-methylstyren) bei Ultraschalleinwirkung in Losung wurde untersucht. Auf Basis eines experimentellen Programms, dessen Ergebnisse auf einem Computer verarbeitet wurden, wurde eine funktionelle Abhangigkeit erhalten, die die Intensitat des mechanischen Abbaus mit den Reaktionspavametern Konzentration, Temperatur und Zeit korreliert. Der radikalische Mechanismus der mechanochemischen Abbaureaktion wurde nachgewiesen.

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Fragmentation of chitosan by ultrasonic irradiation

Kasaai

Arul

Charlet

2008

Ultrasonics Sonochemistry

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Kinetics of chitosan fragmentation by ultrasonic irradiation at frequency of 20 kHz, and the effects of experimental variables (power of ultrasound, chitosan concentration and solution temperature) on fragmentation were investigated. The kinetics studies were followed by measuring solution viscosity of the original and its fragments, and determining average number of chain scission of the fragments. The effects of ultrasonic power, chitosan concentration and solution temperature on fragmentation process were followed by viscometry and size exclusion chromatography. The chemical structure of the original chitosan and its fragments were examined by (1)H NMR spectroscopy and elemental analysis. The experimental results showed that the rate of fragmentation increased with an increase in power of ultrasound. Chain scission increased with an increase in power of ultrasound; and solution temperature, but a decrease in chitosan concentration. The chemical structure and polydispersity of the original and the fragments were nearly identical. A model based on experimental data to describe the relationship between chain scission and experimental variables (power of ultrasound; irradiation time; reduced concentration, c[eta]; and solution temperature) was proposed. It was concluded that ultrasonic irradiation is a suitable method to perform partial depolymerization and to obtain moderate macromolecules from large ones.

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Ultrasonic degradation of polycaproamide in 40% sulfuric acid solution

Cited by 4 publications

References 11 publications

Input power-mechanism relationship for ultrasonic Irradiation: Food and polymer applications

Input power-mechanism relationship for ultrasonic Irradiation: Food and polymer applications

Ultrasonic mechanochemical degradation of the ternary copolymer poly(acrylonitrile‐co‐vinyl acetate‐co‐α‐methylstyrene)

Fragmentation of chitosan by ultrasonic irradiation

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