Journal ArticleDOI
Synthesis of carboxy-telechelic oligostyrene by dead-end polymerization: Evaluation of primary radical termination by kinetic study and kinetic simulation model
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In this article, a new termination reaction known as the primary radical termination (PRT) was observed by a deviation from the simple kinetic law and was determined by several kinetic models to be more important than the constant of bimolecular termination.Abstract:
Styrene was polymerized with azobiscyanovaleric acid (ACVA) to obtain carboxy-telechelic polystyrene. Our aim was to synthesize an oligostyrene with a molecular weight of about 2000 g/mol. Thus, styrene was polymerized at 90 °C, where t 1/2ACVA is very short, and at very high initiator concentrations. In these conditions a new termination reaction appeared, known as the primary radical termination (PRT). At first, PRT was observed by a deviation from the simple kinetic law. Then, the constant of PRT was determined by several kinetic models to be more important than the constant of bimolecular termination. Finally, the PREDICI simulation program was used to confirm the predominance of PRT. This simulation program allowed the determination of the constant of primary radical deactivation k rr and the influence of this reaction on the conversion rate.read more
Citations
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Journal ArticleDOI
A Critical Assessment of the Kinetics and Mechanism of Initiation of Radical Polymerization with Commercially Available Dialkyldiazene Initiators
TL;DR: The dialkyldiazene or azo-compound initiators are one of the most important classes of initiators being widely used in both conventional and reversible-deactivation radical polymerization (RDRP).
Book ChapterDOI
Telechelic Oligomers and Macromonomers by Radical Techniques
TL;DR: In this paper, a review summarizes nearly 400 references (since 1990) intended to highlight directions on the synthesis of telechelic oligomers and macromonomers by radical techniques, taking into account the recent developments in conventional radical polymerizations, such as dead-end polymerizationand also telomerization reactions.
Journal ArticleDOI
An efficient process for synthesizing and hydrolyzing a phosphonated methacrylate: Investigation of the adhesive and anticorrosive properties
Zhor El Asri,Kamel Chougrani,Claire Negrell-Guirao,Ghislain David,Bernard Boutevin,Cédric Loubat +5 more
TL;DR: In this paper, a new phosphonated methacrylate, namely dimethyl(methacryloyloxy)- methyl phosphonate (MAPC1), has been synthesized using paraformaldehyde and po- tassium carbonate according to the Pudovik reaction.
Journal ArticleDOI
Synthesis of telechelic oligomers by atom transfer radical polymerization: A study of acrylate monomers
TL;DR: In this paper, different acrylate oligomers were synthesized by atom transfer radical polymerization in the presence of a transfer agent and CuBr/1,1,4,7,10,10-hexamethyltriethylenetetramine.
Journal ArticleDOI
Investigation of termination reactions in free radical photopolymerization of UV powder formulations
Ahmad Ibrahim,Vanessa Maurin,Christian Ley,Xavier Allonas,Céline Croutxé-Barghorn,Florent Jasinski +5 more
TL;DR: In this paper, the termination mechanism in a UV powder coating system during photopolymerization process was investigated and compared to a conventional acrylate monomer system, and the influence of the photoinitiator concentration, viscosity and conversion percentage of the monomer were assessed leading to the study of curing kinetics of a urethane diacrylate based system.
References
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Journal ArticleDOI
Thermal polymerization of styrene at high conversions and temperatures. An experimental study
Albert W. Hui,Archie E. Hamielec +1 more
TL;DR: An experimental study of thermal polymerization of styrene in the temperature range 100-200°C and conversion range 0-100% is reported in this paper, where conversions, molecular weight averages, and molecular weight distributions were measured.
Journal ArticleDOI
The simulation of molecular weight distributions in polyreaction kinetics by discrete Galerkin methods
TL;DR: A comprehensive solver for the differential equations arising from the modeling of molecular weight distributions in polyreactions is described, based on a so-called discrete Galerkin h-p-method, which allows the efficient treatment of numerous polymerization reaction types.
Journal ArticleDOI
Rate Constants in Free Radical Polymerization. III. Styrene1
Journal ArticleDOI
Primary radical termination in polymerization: Evaluation of the characteristic constant
Pramil C. Deb,G. Meyerhoff +1 more
TL;DR: In this paper, the authors derived an equation which allows determination of the classical efficiency of initiation as a function of [I]/[M]2 and also allowed a correction of Rp in handling the above equation by taking into account the small amount of monomer consumed in initiation.
Journal ArticleDOI
Termination kinetics of free-radical polymerization of styrene over an extended temperature and pressure range
TL;DR: In this paper, the termination rate coefficient k t of the free radical bulk polymerization of styrene is determined between 30 and 90°C up to a maximum pressure of 2800 bar.
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