๐”– Bobbio Scriptorium
โœฆ   LIBER   โœฆ

Free radical decay kinetics in PMMA bone cement

โœ Scribed by Turner, R. C.

Publisher
John Wiley and Sons
Year
1984
Tongue
English
Weight
381 KB
Volume
18
Category
Article
ISSN
0021-9304

No coin nor oath required. For personal study only.

โœฆ Synopsis

Electron-spin resonance has been used to measure the decay of the concentration of polymerization radicals in polymethyl methacrylate (PMMA) bone cement and the kinetics of the decay determined. Thermal annealing at various temperatures has shown that the logarithm of the concentration of radicals vanes linearly with time, but with a nonzero intercept. These results have been analyzed by including both first-and second-order decay processes. The first-order process has an activation energy of 39 e 2 kcaVmol and is probably due to a diffusion-limited termination. The second-order process has an activation energy of 36 -C 5 kcaVmol and is probably due to bimolecular termination.

๐Ÿ“œ SIMILAR VOLUMES

The effect of initial temperature on fre
The effect of initial temperature on free radical decay in PMMA bone cement
โœ Turner, R. C. ;White, F. B. ;Park, J. B. ๐Ÿ“‚ Article ๐Ÿ“… 1982 ๐Ÿ› John Wiley and Sons ๐ŸŒ English โš– 690 KB

## Abstract The effect of varying the initial temperature of the components of poly(methyl methacrylate) (PMMA) bone cement has been investigated. Electron paramagnetic resonance (EPR) spectroscopy was used to monitor free radical decay during the curing of the cement. Samples cured in saline at 37

Dependence of free radical decay on pres
Dependence of free radical decay on pressure in irradiated pmma
โœ F. Szรถcs; J. Plaฤek ๐Ÿ“‚ Article ๐Ÿ“… 1972 ๐Ÿ› Elsevier Science ๐ŸŒ English โš– 216 KB

The influence of pressure on the decay of free radicals in irradiated PMMA has been investigated by ESR over the ranges 80-130 ยฐ and 1-13,000 atm. Dependence on pressure of both the rate constants and activation energies for decay has been determined. The influence of pressure on the mechanism of de

Kinetics of free-radical decay reactions
Kinetics of free-radical decay reactions in polymeric solids
โœ Rafil Basheer; Malcolm Dole ๐Ÿ“‚ Article ๐Ÿ“… 1981 ๐Ÿ› John Wiley and Sons ๐ŸŒ English โš– 376 KB

## Abstract Kinetic equations for the decay of the free radicals in polymeric solids are given for the following assumptions on which they are based: (1) two simultaneous firstโ€order but physically separated decay reactions; (2) two simultaneous noninteracting secondโ€order decay reactions; (3) comb

Decay of free radicals in irradiated PMM
Decay of free radicals in irradiated PMMA at high pressures studied by ESR
โœ F. Szล‘cs ๐Ÿ“‚ Article ๐Ÿ“… 1970 ๐Ÿ› John Wiley and Sons ๐ŸŒ English โš– 204 KB ๐Ÿ‘ 1 views

## Abstract The decay of free radicals in irradiated PMMA subjected to high pressures has been studied by the method of ESR. The rate constants and activation energies has been determined for the decay of free radicals at the pressures of 5000 and 10,000 atm over the temperature range of 100โ€“170ยฐC.

Molecular and macroscopic properties of
Molecular and macroscopic properties of PMMA bone cement: Free-radical generation and temperature change versus mixing ratio
โœ Turner, R. C. ;Atkins, P. E. ;Ackley, M. A. ;Park, J. B. ๐Ÿ“‚ Article ๐Ÿ“… 1981 ๐Ÿ› John Wiley and Sons ๐ŸŒ English โš– 384 KB

## Abstract The molecular and macroscopic changes occurring during the polymerization of poly(methyl methacrylate) (PMMA) bone cement have been investigated. Electron paramagnetic resonance (EPR) spectroscopy was used to monitor freeโ€radical generation and this was compared to temperature changes o