Investigation of the controllable thermal curing reaction for ultrahigh T polyarylene ether nitrile compositions

Self Cite

The synergistic effects of carbon fiber (CF) and polytetrafluoroethylene (PTFE) on the friction and wear behavior of polyarylene ether nitrile (PEN) under dry lubrication condition were studied. According to the scanning electron microscopy (SEM) on the composites' surface after wear, the wear mechanism of the composites under dry sliding condition was analyzed. The research results show that the addition of solid lubricants PTFE and carbon fibers to PEN helps to enhance the properties of friction and wear. The specific wear rate is decreased to 5.7 × 10−7 mm3/N m at a PTFE composition of 5 wt%, which is optimized by 33.4% more than PEN/CF composites. In addition, wear mechanisms are mainly abrasive wear, accompanied by adhesive wear and plowing of the friction ring.

Section: Resultsmentioning

confidence: 98%

Synergistic effects of carbon fiber and polytetrafluoroethylene on the friction and wear behavior of polyarylene ether nitrile under dry lubrication condition

Wang

Liu

et al. 2023

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“…Meanwhile, the gradual decrease of the dielectric constant is thought to be due to the presence of slow dielectric relaxation at the interface between the amorphous phase and the crystal 33 . To quantify the dielectric constant stability of PEN with frequency, the frequency dispersion factor F (x) 34 is calculated here. Equation () is as follows:

F_{((), x)} = \frac{ε_{r (10^{3})} - ε_{r (10^{6})}}{ε_{r ((), 10^{3})}}

F (x) represents the frequency dispersion factor.…”

Section: Resultsmentioning

confidence: 99%

Effect of molecular weight on properties of polyarylene ether nitrile‐based flexible copper clad laminate

Zhang

Wang

et al. 2023

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A series of Polyarylene ether nitriles (PENs) with different molecular weights were synthesized and studied the effect of molecular weight size on the performance of PEN and PEN-based flexible copper clad laminate (FCCL). It shows that these PENs have excellent thermal properties with T g > 200 C, T 5% > 500 C, and a long service life at 200 C (2.64 Â 10 3 min, 95 wt% of the residual weight). The tensile mechanical properties of PENs increase gradually as the molecular weight of PENs increases, and the water absorption decreases with the increasing molecular weight of PENs. However, the peer strength of FCCL showed an opposite trend compared to the tensile properties of pure PEN, and the PEN-2 shows the largest peer strength of 12.79 N/cm. Combining the thermal properties, mechanical properties, water absorption rate of PENs, and the peel strength and flexibility of FCCL, PEN-2 is considered to be the most suitable for FCCL.

“…Poly(arylene ether nitrile) (PEN) is a novel type of special polymer with a large number of rigid benzene rings, flexible ether linkages and strongly polar cyano side-groups. [18][19][20][21][22] Due to these unique molecular structures, PEN offers outstanding heat resistance, chemical resistance, flame retardancy, rigidity and toughness, tunable dielectric properties and processability, as well as molecular structure designability and performance tunability. [23][24][25][26][27][28] In contrast to other polyarylether engineering plastics (such as the sulfone group and ketone group in polyethersulfone and polyetheretherketone), the cyano group hanging on one side of the main chain of PEN molecule has little influence on the molding fluidity of the polymer, which is beneficial to the molding process of PEN.…”

Section: Introductionmentioning

confidence: 99%

“…Hence, it is necessary to choose high performance polymers with excellent properties as the matrix of porous films. Poly(arylene ether nitrile) (PEN) is a novel type of special polymer with a large number of rigid benzene rings, flexible ether linkages and strongly polar cyano side‐groups 18–22 . Due to these unique molecular structures, PEN offers outstanding heat resistance, chemical resistance, flame retardancy, rigidity and toughness, tunable dielectric properties and processability, as well as molecular structure designability and performance tunability 23–28 .…”

Section: Introductionmentioning

confidence: 99%

Synthesis of phenolphthalein/bisphenol A‐based poly(arylene ether nitrile) copolymers: Preparation and properties of films

Zhang

Liu

2022

Self Cite

Poly(arylene ether nitrile) (PEN) is a class of high‐performance engineering plastics of poly(arylene ether) with cyano groups as side groups, which can get improved thermal, mechanical, and electrical properties through simple molecular structure design. In this work, a series of PEN (BPA/PP based PEN) copolymers were synthesized with varying amounts of phenolphthalein and bisphenol A. The influence of the copolymer molecular structure variations on the thermal, mechanical, and dielectric properties of PEN copolymer films was investigated. The results demonstrated that the BPA/PP based PEN copolymer films have great mechanical properties and low dielectric constant, as well as enhanced thermal properties. The highest 5% weight loss temperature of 494.9°C was obtained by PEN‐B7P3, while the highest glass transition temperature of 238.6°C was obtained by PEN‐B3P7. Porous BPA/PP based PEN films prepared by non‐solvent induced phase separation (NIPS) exhibited satisfactory mechanical properties and the highest tensile strength of 9.4 MPa was achieved. Moreover, the introduction of the phenolphthalein structure into the PEN molecular chain can improve the heat resistance of the PEN copolymers without deteriorating the dielectric properties, which gives the copolymers great potential as candidates for applications in flexible electronics and wireless communication.