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- W2149118832 abstract "Polycyclotrimerization of 4,4′-thiodiphenylcyanate was studied by means of differential scanning calorimetry. Samples of different impurity levels or different catalyst loadings (n-nonylphenol (NP), 1 to 10 phr) were studied. In the absence of added catalyst, the sample with higher impurity level (most likely residual water) underwent polycyclotrimerization at a lower temperature range than the sample of comparatively higher purity, although both samples shared the same apparent activation energy (Ea = 93 kJ mol−1) and exhibited similar autocatalysed first-order characteristics. The lowering of the reaction temperature range was more significant in the presence of NP. Interestingly, kinetic features in this case were quite different from the uncatalysed counterpart: in addition to the expected decrease in the apparent activation energy (Ea = 75 kJ mol−1, independent of the catalyst concentration), the cure reaction followed an autocatalysed second-order kinetics. These observations are explained in terms of a mechanistic scheme in which the competition between hydroxyl-catalysed and autocatalytic paths is considered. In particular, formation of NP aggregates ((NP)m, where m ≈ 7) is proposed to account for the less-than-additive catalytic capacity with increasing NP level." @default.
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- W2149118832 date "1995-01-01" @default.
- W2149118832 modified "2023-10-16" @default.
- W2149118832 title "Kinetics of polycyclotrimerization of 4,4′-thiodiphenylcyanate" @default.
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- W2149118832 doi "https://doi.org/10.1016/0032-3861(95)99435-w" @default.
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