Self-Toughening and Self-Enhancement Poly(arylene ether nitrile) with Low Dielectric Constant by Solid Crosslinking Reaction

Abstract

A novel poly(arylene ether nitrile) terminated with hydroxyl groups (PEN–OH) was synthesized successfully. The effects of heat-treatment temperature on the thermal properties, mechanical properties, and dielectric properties of the PEN–OH films were studied in detail. Due to the cross-linking reaction occurring, at high temperature, among the nitrile groups on the side of the PEN–OH main chain to form a structurally stable triazine ring, the structure of materials changes from a linear structure to a bulk structure. Thus, the thermal properties and mechanical properties were improved. In addition, the occurrence of cross-linking reactions can reduce the polar groups in the material, leading to the decrease of dielectric constant. As the heat-treatment temperature increased, the glass-transition temperature increased from 180.6 °C to 203.6 °C, and the dielectric constant decreased from 3.4 to 2.8 at 1 MHz. Proper temperature heat-treatment could improve the tensile strength, as well as the elongation, at the break of the PEN–OH films. Moreover, because of the excellent adhesive property of PEN–OH to copper foil, a double-layer flexible copper clad laminate (FCCL) without any adhesives based on PEN–OH was prepared by a simple hot-press method, which possessed high peel strength with 1.01 N/mm. Therefore, the PEN–OH has potential applications in the electronic field.

Novel low‐dielectric‐constant fluorine‐functionalized polysulfone with outstanding comprehensive properties

“…The absorption peaks at 1307 cm −1 and 1142 cm −1 belong to the asymmetric stretching vibration and symmetrical stretching vibration of the sulfone group, respectively . Compared with the spectrum of sample I, a new absorption peak at 1215 cm −1 (–CF 3 ) appeared in the spectrum of the other samples, indicating the successful reaction between DCS and BPF . Moreover, the desired formation of F‐PSU (sample V) copolymer was further confirmed by liquid phase 1 H NMR spectroscopy with THF as the solvent, as shown in Fig.…”

Dielectric properties of polyethersulfone copolymers containing bisphenol S and six fluorine hexafluorobisphenolA (6AF) segments

“…The absorption bands at 1300 cm −1 and 1140 cm −1 belong to the asymmetric stretching vibration and symmetrical stretching vibration of sulfone group, respectively [38]. Compared with the PES-6AF-0%, a new characteristic absorption peak at 1170 cm −1 (-CF 3 ) in the spectrum of other copolymers appeared, which indicated the successful reaction between DCS and 6AF [39]. Moreover, the chemical structure of PES-6AF copolymers were further affirmed by liquid phase 1H-NMR spectrum with CDCl 3 (δ = 7.28, 1H impurity) as the solvent, as shown in Fig.…”

Preparation and properties of high-temperature resistant bisphthalonitrile resins containing trifluoromethyl groups reinforced by poly (aryl ether nitrile) capped by phthalonitrile and their composites

“…The absorption peak at 1014 cm À1 is the characteristic absorption peak of the phthalocyanine ring 25 and the characteristic absorption peak at 1652 cm À1 was the triazine ring. [26][27][28] Moreover, the cyano absorption peak was at around 2230 cm À1 which obviously diminished with the increasing extent of polymerization. These phenomena all prove that BFPh resin and the blend system undergo crosslinking reaction after curing.…”