Synthesis, characterization, and properties of a novel propargyl ether naphthalene phenolic resin

Abstract

In this study, 1,5‐dihydroxynaphthalene moiety was introduced into a novolac resin structure, and propargyl ether naphthalene phenolic resin (PNPF) was synthesized by the Williamson etherification reaction, which improved the heat resistance of the resin and its processability. The structure of the PNPF resin was characterized using 1H NMR and FTIR analysis, and its processability, heat resistance, thermal expansion, and dielectric properties were evaluated. The results revealed that the addition of 1,5‐dihydroxylhine, increased the reaction activity of the PNPF resin, and decreased its initial curing temperature, with the resin exhibiting excellent processability. The cured resin also showed excellent heat resistance and thermomechanical properties. The 5% weight loss temperature (Td5) and glass transition temperature (Tg) of the resin increased to 437.61 and 362.04°C, respectively, while the coefficient of thermal expansion decreased from 60.17 to 44.52 ppm, with a reduction of 26.01%. Moreover, the dielectric constant and dielectric loss of the cured resin were 3.02 and 0.00239, respectively.

Preparation and properties of novolac epoxy resins containing polycyclic aromatic hydrocarbons

“…This results in low shrinkage stress and low CTE of the thermosets. In addition, for NPF‐EP/MeTHPA, the introduction of a rigid naphthalene ring into the primary chain of the molecule provides the cured resin with a robust cohesive force and favorable molecular orientation, leading to a significant reduction in the CTE 46,47 …”

“…This results in low shrinkage stress and low CTE of the thermosets. In addition, for NPF-EP/ MeTHPA, the introduction of a rigid naphthalene ring into the primary chain of the molecule provides the cured resin with a robust cohesive force and favorable molecular orientation, leading to a significant reduction in the CTE 46. 47 4 | CONCLUSIONS In this study, two novolac epoxy resins containing PHAs (NPF-EP and LPF-EP) had been successfully synthesized and cured by MeTHPA to prepare the epoxy thermosets.…”