autoacceleration


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autoacceleration

[¦ȯd·ō·ik‚sel·ə′rā·shən]
(organic chemistry)
The increase in polymerization rate and molecular weight of certain vinyl monomers during bulk polymerization.
References in periodicals archive ?
This effect, causing autoacceleration of the polymerization reactions, was first reported by Norrish and Brookman [32] on poly-methyl methacrylate (PMMA) polymerizations.
Rheological Behavior of Reaction Mixtures during the Graft Copolymerization of Cassava Starch with Acrylic Acid
However, the various phenomena of autoacceleration, unequal reactivity of different functional groups, multiple termination processes, volume shrinkage, and the heterogeneities of the networks formed make the understanding of the mechanisms difficult.
Thermal and photocuring of an acrylate-based coating resin reinforced with nanosilica particles
ABSENCE OF AUTOACCELERATION IN AROMATIC SULFONYL AZIDES AS FREE-
Overview of Divisional Programs
The main motivation to search for other models for the simulation of the photopolymerization process was to see the effects of autoacceleration, autodeceleration, volume shrinkage, and reaction diffusion terms on the system besides the basic photopolymerization reaction mechanisms of initiation, propagation, and termination.
Simulation of models for multifunctional photopolymerization kinetics
6 and 7, some typical features of the curing process are represented, such as autoacceleration and autodeceleration, which are in agreement with theoretical predictions.
Synthesis, photopolymerization kinetics, and thermal properties of UV-curable waterborne hyperbranched polyurethane acrylate dispersions
ABSENCE OF AUTOACCELERATION IN AROMATIC SULFONYL AZIDES AS FREE-RADICAL INITIATORS FOR PHOTOPOLYMERIZATION
Chemistry and chemical engineering
Unlike as reported in this paper for nylon fibers, the property gradients in polypropylene fibers were attributed to autoacceleration by surface oxidation during processing or screening by UV absorbing additives.
Effect of accelerated ultraviolet and thermal exposure on nanoscale mechanical properties of nylon fibers
The data illustrates autoacceleration immediately after irradiation commences so that the reaction rate reaches a maximum value at a double bond conversion of about 10%.
Impact of radiation attenuation and temperature evolution on monomer conversion of dimethacrylate-based resins with a photobleaching photoinitiator
With the process of reaction, three-dimensional gel structure is formed, which restricts the diffusion and mobility of macroradicals and pendant double bonds, slowing down the radical termination rate, which leads to autoacceleration.
Polymeric Michler's ketone photoinitiator containing coinitiator amine
Indeed, if the proposed mechanism is valid, one would expect autoacceleration and chain scissions after a certain exposure time (longer than 1200 h) at 20 [degrees]C, because hydroperoxides also accumulate at this temperature.
Aging of polyethylene pipes transporting drinking water disinfected by chlorine dioxide. I. chemical aspects
A reduction in the termination rate accumulated radical population and thus resulted in an autoacceleration in the polymerization rate.
Diffusion-controlled atom transfer radical polymerization with crosslinking
But in the experiment, the gel effect often takes place at intermediate or high degrees of polymerization, and then results in the autoacceleration of the rate of the polymerization [38, 39].
Computer simulation of reactive extrusion processes for free radical polymerization
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