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Distributed Midpoint Chain Scission in Ultrasonic Degradation of Polymers.
- Source :
- AIChE Journal; Sep2004, Vol. 50 Issue 9, p2258-2265, 8p, 1 Chart, 5 Graphs
- Publication Year :
- 2004
-
Abstract
- The ultrasonic degradation of poly(bisphenol A carbonate), poly(ε-caprolactone), and poly(vinyl acetate) was investigated with various solvents such as benzene, monochlorobenzene, and dichlorobenzene. The time evolution of molecular weight was determined using gel permeation chromatography. A limiting molecular weight was observed for all the systems and was a function of solvent properties. The degradation rates increased with increase in viscosity and decrease in vapor pressure. The polydispersity reached a maximum before reaching a constant value at longer times. The experimental data indicate that the breakage of the polymer is around midpoint, with a distribution rather than an ideal midpoint scission. A continuous distribution model with a stoichiometric kernel based on Lorentzian probability distribution function was developed to satisfactorily model the experimental data. [ABSTRACT FROM AUTHOR]
- Subjects :
- ULTRASONICS
SOUND
BIODEGRADATION
BIOCHEMISTRY
CARBONATES
CHLOROBENZENE
BENZENE
Subjects
Details
- Language :
- English
- ISSN :
- 00011541
- Volume :
- 50
- Issue :
- 9
- Database :
- Complementary Index
- Journal :
- AIChE Journal
- Publication Type :
- Academic Journal
- Accession number :
- 14598025
- Full Text :
- https://doi.org/10.1002/aic.10185