| Nitrogen heterocyclic compound(NHC) phenothiazine(PTS), hydroquinone(HQ), benzyl triethyl ammonium chloride(BTEAC) and Bisphenol A(BPA) were selected as inhibitors to improve storage life of novolac-epoxy vinyl-ester resin (Novolac-VER). The inhibitors were combined by orthogonal test and the best combination was found which most significantly improve storage life of Novolac-VER and the effect of the best combination on curing drift was studies. Quantitative analysis the change rate of C=C double-bond of Novolac-VER with the best combination in storage life at 80℃and after cured by FTIR. The effect of inhibitors on cure kinetics was studied by DSC and Kissinger equation. The result showed that 0.03wt% NHC and 0.03wt% PTS were the best combination which can significantly increase the storage life of Novolac-VER from 11h to 60h at 80℃, while HQ, BPA and BTEAC with little affection. The result of quantitative analysis showed that residual percentage of total C=C double-bond was 63.7% in 50h at 80℃, and it can increase apparent activation energy of resin from 79.00KJ/mol to 87.44KJ/mol, which meaned that the best combination inhibitor made a good role of inhibiting. The result of the test of insoluble matter content of resin is 96.91%, which showed that the inhibitors would not effect final curing degree.NHC, PTS, HQ, BTEAC and BPA were selected as inhibitors to improve storage life of MFE-W3. The inhibitors were combined by orthogonal test and the best combination was found which most significantly improve storage life of MFE-W3. And effect of inhibitors on cure kinetics was studied by curing curves and DSC. The result showed that the combination which include 0.03wt% NHC,0.03wt% PTS and 0.03wt%(BPA:BTEAC) can increase the storage life of MFE-W3 from 23h to 69h at 80℃, the combination which include 0.03wt% NHC and 0.03wt% PTS can increase apparent activation energy of resin from 76.95KJ/mol to 83.90KJ/mol, but curing drift was not improved. |
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