Novel tough and thermally stable cyanate ester resins with high flame retardancy, low dielectric loss and constant based on a phenolphthalein type polyarylether sulfone

Abstract

It still remains a big challenge to improve the toughness and flame retardancy of cyanate ester (CE) resin through a simple and effective method without sacrificing its excellent dielectric properties and thermal stability. New modified CE resins were facilely developed through melt-blending with phenolphthalein type polyarylether sulfone (cPES), and the integrated performances including the reactivity, mechanical, dielectric, thermal and flame retarding properties were systematically investigated. Results show that compared with CE resin, cPES/CE resins have 1.2-3.2 times higher impact strengths according to the concentration of cPES on the base of maintaining good thermal stability, high modulus, low dielectric constant and loss. Through analyzing thermogravimetric kinetics, cone calorimeter tests, structures of chars and pyrolysis gases, it proves that the addition of cPES into CE resin brings greatly increased difficulty of catching fire, reflected by the time to ignition (TTI), fire performance index (FPI) and fire growth index (FGI); while once ignited, cPES/CE resin exhibits a bigger heat release rate and total heat release. These attractive results demonstrate that cPES is a multi-functional modifier of CE resin. The origin behind was systematically revealed through discussing the influence of cPES on the structure of crosslinked network.

Flame‐retardant cyanate ester resin with suppressed toxic volatiles based on environmentally friendly halloysite nanotube/graphene oxide hybrid

“…Although the T di of CE resin is as high as 427.3 °C, when the temperature is only 200 °C, a absorption peak of CO 2 (2362 cm −1 ) appears in the FTIR spectrum of CE resin [Figure (c)]; in contrast, only when the temperature reaches 396–415 °C can the CO 2 absorption peak be observed in the FTIR spectra of all composites. As the temperature is further increased, peaks reflecting nitrogen (1183 cm −1 ), aliphatic (1259 cm −1 ), aromatic (1596 cm −1 ), and hydrocarbon compounds (3050 cm −1 ) are found in the FTIR spectra of 2.0GO/CE [428 °C, Figure (d)], (2.0GO+2.5HNT)/CE [433 °C, Figure (f)], and 2.5HNT/CE [443 °C, Figure (e)], respectively. When the temperature is increased to 451 °C, these peaks can be observed in the spectra of the CE resin [Figure (c)] and the 5.0GHNT/CE composite [Figure (g)].…”

Semi-Interpenetrating Polymer Networks Based on Cyanate Ester and Highly Soluble Thermoplastic Polyimide

“…Considerable improvements were achieved in terms of impact strength, flame retardancy, and dielectric constant and loss factor when compared with pure polycyanurates. However, the majority of thermoplastics for CE modifications possessed a T g of less than 250 °C because of the presence of a flexible ether linkage, which could downgrade the T g and high-temperature modulus of the resultant thermosets [21].…”

Facile strategy and mechanism of greatly toughening epoxy resin using polyethersulfone through controlling phase separation with microwave‐assisted thermal curing technique

“…However, TRRs generally have poor toughness due to highly crosslinked structure . In order to improve toughness without degrading heat resistance of TRRs, engineering thermoplastics with good heat resistance, such as polyethersulfone (PES), polysulfone, polyetheretherketone, and polyetherimide have been utilized to toughen thermosetting resins, and many valuable achievements in theoretic and industrial aspects have been obtained.…”