peaks at 330.2 and 432.5 AoC could be attributed to the low-temperature decomposition (LTD) process and the high-temperature decomposition (HTD) process of AP.
The TGA curve of the straight novolak in nitrogen flux is displayed in Fig.6A, and shows that the decomposition onset was around 400[degrees]C, a slight exothermic
peak was found around 600[degrees]C that can be attributed to a self-oxidation due to the oxygen belonging to the phenol formaldehyde resin.
The total amount of heat release in different hydration stages also shows a similarity to the second exothermic
peak, as can be seen from Figure 2, TG, TB, DMO, and EAC can improve the total amount of heat release in 24 h, 48 h, and 72 h, and the greater the number of ester groups, the stronger the effect.
In the FeAc graph (Figure 3.a) is seen a decrease of the exothermic
peaks when the dynamic temperature increases and it may be associated with the larger particles of the material, while in the FeAc-FD (Figure 3.b) we can see an increase of the peaks when it increases the dynamic temperature, so it may be related to the smaller particles.
[Al.sub.2][Si.sub.2][O.sub.5][(OH).sub.4] [right arrow] [Al.sub.2] [Si.sub.2][O.sub.7] + [H.sub.2]O (2) Kaolinite metakaolinite Exothermic
temperature peaks between 930 [degree]C and 1000 [degree]C were attributed to the temperature range for mullite formation from metakaolinite (Ekosse, 2008) as per the following equation:
Thus, it can be assumed that the exothermic
maximum at temperatures 250...280[degrees]C is a consequence of the interaction of ammonium nitrate with nitrogen dioxide (7), as well as interaction of N[O.sub.2] with formed by (4) ammonia:
The OZSBO/pMDl resins with eqMRs of 1:0.5, 1:0.75, and 1:1 exhibited an exothermic
reaction at 150[degrees]C, resins with eq-MRs of 1:2 and 1:3 showed exothermic
peaks at 185[degrees]C and resins with an eqMR of 1:4 presented an exothermic
peak at 180[degrees]C.
They are shown that a clear linear relationship between the heating rate and reversal of the exothermic
This would then be followed by an exothermic
step involving the expulsion of an activated atom, [CHS-HA.sup.*] [right arrow] CHS-H + [A.sup.*], followed by the line emission from [A.sup.*], [A.sup.*] [right arrow] A + hv.
In combination, Huntsman says the system's good thixotropic and low exothermic
properties lead to improved process efficiencies, characterised by easy handling and mixing, a long pot life of 240 minutes at 23[degrees]C, fast strength build-up and reduced curing cycle capabilities.
Effects of activation energy (E) and exothermic
parameter ([beta]) on the temperature, the concentration and velocity profiles are shown in Figure 1 to Figure 3, respectively.
The binding of PPA-I or PPA-II with 5-CQA or CA was all exothermic