Abstract
In order to modify the curing procedure and broaden the processing windows of phthalonitrile, allyl phenolic moieties were incorporated into phthalonitrile resins at different ratios through sequential nucleophilic substitution reaction. The curing behavior, along with the reaction between allyl and nitrile groups, were investigated in detail. The curing kinetic equations were derived by Šesták-Berggren (SB) model. The rheological tests showed that the minimum viscosity significantly decreased from 15Pa·s to less than 1Pa·s and the processing windows varied from 24 to 89°C with the allylation degree increasing. The novel oligomers demonstrated a maximum T5% of 494°C, 74% char yield at 1000°C and a high glass transition temperature exceeding 400°C. The correlation between allylation degree and concerned parameters, including curing temperatures, processing windows and T5% was established, which allows for tailoring polymer structure for various applications.
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