Sonolytic decomposition of poly(vinylpyrrolidone), ethanol, and tetranitromethane in aqueous solution

Journal Article · Thu May 19 04:00:00 EDT 1988 · J. Phys. Chem.; (United States)

DOI:https://doi.org/10.1021/j100321a052· OSTI ID:6884767

Gutierrez, M; Henglein, A

Aqueous solutions of poly(vinylpyrrolidone), PVP (as nonvolatile solute), ethanol (as volatile and soluble solute), and tetranitromethane, TNM (as volatile and almost insoluble solute), were irradiated under argon with 300-kHz ultrasound at an intensity of 2 W x cm/sup -2/. In all three cases, products were observed (such as CH/sub 4/, C/sub 2/H/sub 4/, C/sub 2/H/sub 6/, CO, and CO/sub 2/ from PVP and ethanol, and NO/sub 2//sup -/, NO/sub 3//sup -/, N/sub 2/, CO, and CO/sub 2/ from TNM), the formation of which can only be understood in terms of pyrolysis in or close to the cavitation bubbles. More pyrolysis products are formed from PVP than bonds are broken in the main chain by hydrodynamic shear forces in the neighborhood of cavitation bubbles. The decomposition of TNM is one of the fastest sonochemical reaction. The yields were determined at various solute concentrations, and it was concluded from these data that (1) the extent of pyrolysis depends on the rate of dehydration of solute molecules, this rate increasing with their hydrophobicity, and (2) pyrolysis might be supported by free-radical attack.

• Research Organization: Hahn-Meitner-Institut Berlin (Germany, F.R.)
• OSTI ID: 6884767
• Journal Information: J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 92:10; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ALCOHOLS
AMIDES
AQUEOUS SOLUTIONS
ARGON
AZOLES
BLOOD SUBSTITUTES
CHEMICAL EXPLOSIVES
CHEMICAL REACTIONS
DATA
DECOMPOSITION
DISPERSIONS
DRUGS
ELEMENTS
ETHANOL
EXPERIMENTAL DATA
EXPLOSIVES
FLUIDS
FREQUENCY RANGE
GASES
HEMATOLOGIC AGENTS
HETEROCYCLIC COMPOUNDS
HYDROXY COMPOUNDS
INFORMATION
KHZ RANGE
KHZ RANGE 01-100
LACTAMS
MIXTURES
NITRO COMPOUNDS
NITROMETHANE
NONMETALS
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC POLYMERS
POLYMERS
POLYVINYLS
PVP
PYRROLES
PYRROLIDONES
RARE GASES
SOLUTIONS
SOUND WAVES
ULTRASONIC WAVES