Synthesis and properties of phthalonitrile terminated polyaryl ether nitrile containing fluorene group

Abstract

A series of phthalonitrile terminated polyaryl ether nitrile oligomers containing fluorene group (BPPENs) were synthesized and cured in the presence of bis[4‐(4‐aminophenoxy)phenyl]sulfone. Additionally, the quartz fiber reinforced composites were prepared by hot‐pressing process. The structure of oligomers was characterized by 1H‐NMR and GPC. The curing behavior of BPPENs was studied by DSC, IR, and rheological tests in detail. Thermal stability and mechanical properties were also investigated. The results showed that the oligomers showed excellent solubility. BPPENs could be dissolved in common solvents at ambient temperature. TGA and DMA results showed that the cured polymer and composites possessed excellent thermal properties with high residual weight of 72.4% at 1000 °C and 5% thermal degradation temperature (T5%) of 548 °C under inert atmosphere. The bending strength of quartz fiber reinforced composites was about 500 MPa, exhibiting good mechanical property. The products could be used as high performance polymers or a modifier for heat‐resistant resins. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46606.

Enhanced properties of phthalonitrile resins reinforced by novel phthalonitrile-terminated polyaryl ether nitrile containing fluorene group

“…BPPEN was prepared according to our previous publication and characterized by using hydrogen nuclear magnetic resonance ( 1 H NMR), FTIR, and GPC. 26 Based on the previous studies, BPPEN with an average molecular weight of 4500 ( M w ) was selected as the modifier used in this work.…”

“…This phenomenon demonstrated that, within 15 wt%, BPPEN had limited impact on the rheological behavior of the blends, despite BPPEN itself possessed very high viscosity as reported in previous work. 26 And the low viscosity values of BPAPNs made these resins suitable for liquid composite fabrication process, such as resin transfer molding. 4 The viscosity of blends started to increase sharply around 280-310 C, which convinced the cross-linking reaction of the resins in the presence of amine catalyst.…”

“…As discussed in our previous work, phthalonitrile-terminated polyaryl ether nitrile containing fluorene group (BPPEN) oligomers possessed excellent thermal stability, good mechanical properties, and processability. 26 Also, we developed a series of phthalonitrile resins, including ortho-linked aromatic and heterocyclic monomers, 27 novolac-phthalonitrile resins, 28 and self-catalytic amino-containing phthalonitrile resins. 4,29 And relationship between thermal and mechanical properties and molecular structures were established.…”

Polymerization mechanism of 4-APN and a new catalyst for phthalonitrile resin polymerization

“…[7][8][9] This promoted the development of PN resin, 9,11 which has happened rapidly over the past 20 years. [12][13][14][15][16][17][18] Among these PN catalysts, the catalysts containing -NH 2 have the highest outstanding catalytic performance and have been widely used, [19][20][21][22][23][24] such as p-BAPS, 25 m-APB, 26 4-APN, 5 etc. (shown in Fig.…”

Improving the thermal and mechanical properties of poly(arylene ether nitrile) films through blending high‐ and low‐molecular‐weight polymers

“…Poly(arylene ether nitrile)‐phenyl (PEN‐Ph) as a kind of high‐performance engineering plastics is usually a linear polymer, and it is widely used in the commercial and academic fields due to its excellent performance such as outstanding chemical properties (radiation resistance, low flammability, and toxic gas emission), high thermal stability, superior mechanical properties as well as good molding workability . The PEN with different dihydric phenol structure (Figure ) possesses different properties.…”