gelation time


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gelation time

[jə′lā·shən ‚tīm]
(chemical engineering)
In the manufacture of a thermosetting resin, the time interval between the addition of the catalyst into a liquid adhesive system and the formation of a gel.
References in periodicals archive ?
1 and corresponds to the point at which the viscosity starts to increase, whereas point B is designated as the gelation time.
2] In series B, where the pigments contain zinc either as the oxide or in the form of ions, an increase in the silica/alumina ratio leads to a decrease in the gelation time.
The effect of viscosity was clearly reflected in the gelation time of resin prepared from both of the tannins; the higher the viscosity, the lower the gelation time.
Before gelation time, the thermosetting resin at the early stage of curing is in liquid state and the viscous behavior dominates the initial part of the curing process.
The use of high incubation temperature resulted in a decrease in gelation time and G' values at pH 4.
A gelation time of around 90 seconds, after which the sample will cease to flow like a liquid, is easily identified from the graph above.
In addition, the gelation time refers to the time where the critical degree of polymerization was measured.
The pH and gelation time of the batch containing with and without water was examined.
The gelation time was determined when the magnetic stirrer stopped stirring.
Finally, it was observed that the higher acrylic acid increases the polymerization rate and shorter the gelation time.
The gelation time (determined from the storage modulus and the loss modulus crossover point) for the PAEK-CN-II prepolymers is summarized in Table 2.