Jing-zhi Ma, K. Cheng, J. Lv
Apr 1, 2018
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0
Influential Citations
22
Citations
Journal
Chinese Journal of Polymer Science
Abstract
Hydroxy-containing low molecular weight poly(2,6-dimethyl-1,4-phenylene oxide) (rPPO) and self-promoted hydroxycontaining phthalonitrile (HPPH) were prepared by redistribution reaction and the simple nucleophilic displacement of a nitro-substituent from 4-nitrophthalonitrile in a dipolar aprotic solvent respectively. The hydroxy-containing phthalonitriles modified by rPPO were prepared by mechanical blending without compatibilizer, followed by heating. The curing behavior was studied using dynamic rheological analysis, and the results showed that the rPPO-modified phthalonitrile exhibited a large processing window (over −67 °C) and complex viscosity (0.18−0.8 Pa·s) at moderate temperatures. After curing at 300 °C, the resulting polymers showed good thermal stability and high modulus as observed by thermogravimetric analysis (TGA) and dynamic mechanical analysis (DMA). The dielectric properties and the morphology of rPPO-modified phthalonitrile networks were studied by dielectric analysis and field-emission scanning electron microscopy (SEM).