Issue 127, 2015

Preparation of self-promoted hydroxy-containing phthalonitrile resins by an in situ reaction

Abstract

The in situ reaction of a hydroxy group with a phthalonitrile system was carried out by the simple nucleophilic displacement of a nitro-substituent from 4-nitrophthalonitrile in a dipolar aprotic solvent, in a one-pot reaction. The hydroxy-containing phthalonitrile system (HPBD) was prepared by mixing 4-hydroxyphenoxy phthalonitrile (HPPH) and 1,3-bis(3,4-dicyanophenoxy)benzene (BDB), followed by heating. The curing behavior was studied using differential scanning calorimetry and dynamic rheological analysis, and the results indicated that the HPBD exhibits a large processing window (∼75 °C) and low complex viscosity (0.1–1 Pa s) at moderate temperatures. Fourier transform infrared spectroscopy (FT-IR) showed that polytriazine, polyindoline and phthalocyanine structures were formed during polymerization, and that the introduction of HPPH facilitated the curing reaction. Additionally, the prepared HPBD polymers showed outstanding thermal stability, a high modulus and a high glass transition temperature (Tg). After curing at 300 °C, the Tg of HPBD resin was raised to 410 °C. Postcuring effects on the thermal and dynamic mechanical properties were evaluated using thermogravimetric analysis (TGA) and dynamic mechanical analysis (DMA).

Graphical abstract: Preparation of self-promoted hydroxy-containing phthalonitrile resins by an in situ reaction

Article information

Article type
Paper
Submitted
09 Sep 2015
Accepted
25 Nov 2015
First published
26 Nov 2015

RSC Adv., 2015,5, 105038-105046

Author version available

Preparation of self-promoted hydroxy-containing phthalonitrile resins by an in situ reaction

J. Wang, J. Hu, K. Zeng and G. Yang, RSC Adv., 2015, 5, 105038 DOI: 10.1039/C5RA18472J

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