36) The increase in the silica level in series B is able to counter the inhibiting effect of the zinc and leads to a decrease in the gelation time
The nonlinear dependence of the gelation time
on the photoinitiator loading concentration somewhat decreases as the functionality of monomers decreases.
This trace shows a gelation time
of about 20 s; reactions of deoxygenated systems are much faster, with characteristic times on the order of a few seconds.
Traces of gels appeared at around 6 min of compounding time, which is very close to the gelation times
estimated by the APA measurements, in spite of the fact that the processing environment was entirely different.
The addition of CTBN in the system had a great influence on the gelation time
of the systems at lower temperatures, but little influence at higher temperatures, as shown in Fig.
And the time to reach this liquid-to-rubber transition is gelation time
and it is used to calculate the activation energy for chemical curing reaction.
However, this equation does not imply a gelation time
t*, defined as the time at which the material no longer flows ([eta] = [infinity]).
The conventional ZnO basically has no effect, although the gelation peak becomes slightly higher, and the gelation time
(the time at the torque peak) is slightly shortened because the viscosity is increased by the filler particles and more heat is generated.
The viscosity of UP and VDAC-MMT mixture increases slowly and the gelation time
was observed much longer than in styrene and VDAC-MMT mixture (15, 16).
The influence of the organoclay on the gelation time
of the three different DETDA cured resins was investigated by dynamic rheology.
The fact that the experimental gelation time
is between these two extremes confirms that the reactivit y of HBP when mixed with DGEBA is increased, but becomes noticeably lower than that of DGEBA as the HBP content is increased.
Two models are available: the 1rpm GT-5 shows times in one-minute increments up to 9999 minutes, while the 10rpm GT-6 version displays to the nearest tenth of a minute, making it ideal for materials with shorter gelation times
The gelation times
of the gels prepared were in the range of one to four hours depending on the composition, but the gel was always left for 48 h to enable the curing process to take place.
4 that the gelation times
decline with increasing temperature due to the faster progression of crosslinking reaction at higher temperatures.
One can now compare resin gelation times
at sensors 1 and 3 by using the ratio of the difference between the gel time at sensors 1 and 3 and divide it by the time it takes to fill the mold.