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- W2060159049 abstract "This work was aimed at studying variations in the termination mechanism occurring during the after-effects of a light-induced polymerization of a dimethacrylate monomer after the irradiation had been discontinued. The experimental method was based on differential scanning calorimetry. The initiation was stopped at various moments of the reaction corresponding to different degrees of double-bond conversion (starting conversions). Three termination models: monomolecular, bimolecular, and mixed were used to calculate the ratio of the bimolecular termination and propagation rate coefficients ktb/kp and/or the monomolecular termination rate coefficient ktm. The models were determined over short time intervals (conversion increments) of the dark reaction giving different values of rate coefficients for each time interval (interval approximation method). Two-stage statistical analysis was used to find the model that best reproduced the experimental data obtained for each conversion increment. This enabled variations in the termination mechanism during the after-effects to be followed. It was found that the termination mechanism changed with the time of the dark reaction from the bimolecular reaction to the mixed reaction when the light was cut off at low and medium double-bond conversions. At higher starting conversions a monomolecular termination mechanism dominated from the beginning of the dark reaction. The mixed termination model was the only model to describe correctly the variations of rate coefficients in the dark, i. e., the increase in ktm and the decreasein the ktb/kp ratio." @default.
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- W2060159049 date "2001-11-01" @default.
- W2060159049 modified "2023-10-14" @default.
- W2060159049 title "Variations of Rate Coefficients and Termination Mechanism During the After-Effects of a Light- Induced Polymerization of a Dimethacrylate Monomer" @default.
- W2060159049 doi "https://doi.org/10.1002/1521-3919(20011101)10:9<842::aid-mats842>3.0.co;2-q" @default.
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