Ambient temperature cross-linking of a sustainable, cardanol-based cyanate esterviasynergistic thiol–ene copolymerization

Abstract

Cardanol, a low-cost component of cashew nut shell oil, is a phenolic compound with a 15-carbon unsaturated chain in the position meta to the hydroxyl group. This biorenewable substrate was...

Effects of Accelerated Aging on Thermal, Mechanical and Shape Memory Properties of Cyanate-Based Shape Memory Polymer: III Vacuum Thermal Cycling

“…The T g of SMCR treated with vacuum thermal cycling increased by 5-10 • C. Both the storage modulus of the SMCR in the glass state and the storage modulus in the rubber state increased significantly with the increase in the times of vacuum thermal cycling. When SMCR suffered 50 high-and low-temperature cycles, the peak of its tan δ curve moved to the higher temperature, from 205.8 to 215.3 • C. The storage modulus in the high-temperature section was often used as the basis for evaluating the cross-linking density of polymers [35][36][37]. The higher the storage modulus of the polymer in the high-temperature range, the higher the cross-link density.…”

“…temperature cycles, the peak of its tan δ curve moved to the higher temper 205.8 to 215.3 °C. The storage modulus in the high-temperature section was of the basis for evaluating the cross-linking density of polymers [35][36][37]. The high age modulus of the polymer in the high-temperature range, the higher the cros sity.…”

Controllable confinement nano-reinforced organic–inorganic cyanate ester resins with optimal modulus and dielectric properties trade-offs

“…Cyanate ester (CE) possess outstanding mechanical properties and thermal stabilities, low dielectric constant (ε) and dielectric loss (tan δ), resistance to vacuum atomic oxygen irradiation, and excellent size stability, making them especially suitable as structural materials in aerospace applications, such as for radomes and antennas of satellites. [1][2][3][4][5][6][7] CE resins are typically employed as a matrix in this application, while highmodulus carbon fiber serves as the reinforcement, resulting in the formation of high-modulus carbon reinforced cyanate ester resin composites. Due to the high modulus of highmodulus carbon fiber (>370 GPa), it is crucial to ensure that the modulus and elongation at break of the matrix and the carbon fiber match to take full advantage of its performance.…”

Preparation and properties of bisphenol A polyetherketoneketone based phthalonitrile resins

“…These CE polymers possess properties such as low cure temperature, dielectric constants, superior adhesive properties, and radar transparency. [11][12][13][14] However, CE resins have critical disadvantages including long-term moisture-promoted degradation 15 coupled with synthesis involving the highly toxic cyanogen bromide reagent. Moreover, CE resins undergo an especially exergonic cure that can result in a runaway exothermic reaction, which requires a meticulously managed cure procedure.…”

“…Although some work to lower the cure temperatures has been developed recently, 10 CE resins are a widely studied and utilized class of polymers. These CE polymers possess properties such as low cure temperature, dielectric constants, superior adhesive properties, and radar transparency 11–14 . However, CE resins have critical disadvantages including long‐term moisture‐promoted degradation 15 coupled with synthesis involving the highly toxic cyanogen bromide reagent.…”