## Abstract The technique of SPPLP EPR, which is singleβpulse pulsedβlaser polymerization (SPPLP) in conjunction with electron paramagnetic resonance (EPR) spectroscopy, is used to carry out a detailed investigation of secondary (chainβend) radical termination of acrylates. Measurements are perform
Polymer chain-length dependence of bimolecular reaction and polymerization
β Scribed by Kamachi, Mikiharu
- Publisher
- Wiley (John Wiley & Sons)
- Year
- 1985
- Weight
- 477 KB
- Volume
- 14
- Category
- Article
- ISSN
- 0025-116X
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β¦ Synopsis
both activation-and diffusion-controlled bimolecular reactions.
The reaction rate constants for the former reactions are independent of the chain length of reactants, and those for the latter reactions decrease with increasing degree of polymerization of reactants. Quantitative studies on the chain length dependence of the diffusion-controlled reactions are mentioned with the historical development. Termination reaction in radical polymerization is a typical example of the diffusion-controlled reaction.
The effect of chain-length of the termination rate constant on radical polymerization kinetics is shown both computationally and experimentally.
At last, several examples of polymer effect on stereoregularity of polymers obtained by radical polymerizations are given.
π SIMILAR VOLUMES
The photosensitized polymerization of styrene in bulk was investigated in the temperature range of 25-70Β°C with respect to the average rate coefficient of bimolecular chain termination k t , especially its chain length dependence at low conversions, by means of pulsed laser polymerization (PLP). Thr
A numerical procedure is developed which allows taking into account the chain length dependence of the termination and propagation constants for calculating molecular weight distributions (MWDs) formed under free-radical polymerization initiated by an arbitrary sequence of laser pulses. The law whe
The correct (event-weighted) average of k,, (k,), has been calculated from simulation data for pseudostationary laser-induced polymerization for a kinetic scheme with chain-length dependent termination and compared to the average k, which is obtained by employing the formal procedures, originally de