Composite films with low dielectric constant and dielectric loss factor at high frequency prepared from polyimide and polytetrafluoroethylene

Zhang, Wang; Jiang, Hanzhou; Nie, Yong; Fang, Xingzhong; Chen, Guofei

doi:10.1002/pen.26181

Cited by 17 publications

(7 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Due to its unique molecular structure, polyimide (PI) has excellent temperature resistance, mechanical properties, and insulation properties. This make it extensively utilized in the fields of automotive, aerospace, and electronic devices 1–4 . However, limitations such as relatively low mechanical properties, high cost, poor machinability, and susceptibility to mechanical damage under extreme conditions significantly restrict its application in demanding engineering scenarios 5,6 .…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Investigation on flame‐retardant, thermal and mechanical properties of glass fiber reinforced polyimide composites

He,

Liu,

Jiao

2023

Polymer Composites

View full text Add to dashboard Cite

Composites with excellent flame retardant and mechanical properties are in high demand in the aerospace and various industrial fields. Glass fiber (GF) reinforced polyimide (PI) composites (GFRPCs) were fabricated using a simple ball milling and hot pressing technique. The effect of GF content on the thermal stability, mechanical and flame retardant properties of composites has been systematically studied. The Rockwell hardness of GFRPCs increase with increasing GF content, while the compressive strength, impact strength and flexural strength initially show an increase followed by a decrease due to the excellent dispersibility of the fillers and the strong interfacial interaction between the one‐dimensional GF and PI matrix. Thermogravimetric analysis results show that the addition of GF with very low thermal conductivity and excellent temperature resistance can effectively improve the thermal stability of PI. Adding GF into PI can obviously improve the limiting oxygen index value. Moreover, as the GF content increased, the time to ignition of the composites prolonged while total heat release decreased. These findings suggest a viable solution for enhancing both the flame retardance and mechanical properties of PI‐based composites.Highlights GFRPCs with high GF content fabricated via ball milling‐hot pressing method. Silane modified GF obviously improves the thermal stability of PI matrix. GFRPCs‐28 exhibits superior mechanical properties. An increases in time to ignition (TTI) and mass residual rate (MRR) of the GFRPCs was observed on adding GF.

show abstract

Section: Introductionmentioning

confidence: 99%

“…This make it extensively utilized in the fields of automotive, aerospace, and electronic devices. [1][2][3][4] However, limitations such as relatively low mechanical properties, high cost, poor machinability, and susceptibility to mechanical damage under extreme conditions significantly restrict its application in demanding…”

mentioning

confidence: 99%

Investigation on flame‐retardant, thermal and mechanical properties of glass fiber reinforced polyimide composites

He,

Liu,

Jiao

2023

Polymer Composites

View full text Add to dashboard Cite

show abstract

“…3,4 The introduction of fluorine element in the poly(aryl ether) can simultaneously obtain the advantages of both fluorine resin and poly(aryl ether), and this molecular modification method also further broadens the application fields of fluoropolymers. [5][6][7][8][9][10] Although FPAE has many advantages, most of them are amorphous, which leads to poor dimensional stability and thermal resistance, limiting the practical applications. Dimensional stability is an important parameter that should be considered for polymers in practical processing scenarios.…”

Section: Introductionmentioning

confidence: 99%

“…As a class of high performance polymer, fluorinated poly(aryl ether) (FPAE) have excellent thermal and mechanical properties due to the presence of a large number of aromatic structures, while the presence of ether groups increases the flexibility of the polymer molecular chain to a certain extent, making it both tough and machinable 3,4 . The introduction of fluorine element in the poly(aryl ether) can simultaneously obtain the advantages of both fluorine resin and poly(aryl ether), and this molecular modification method also further broadens the application fields of fluoropolymers 5–10 …”

Section: Introductionmentioning

confidence: 99%

Preparation of fluorinated poly(aryl ether) with high dimensional stability and high temperature resistance by photo‐thermal dual crosslinking reaction

Wang,

Yang,

Zhang

et al. 2023

Polymer Engineering & Sci

View full text Add to dashboard Cite

Improving the dimensional stability is significant for fluorinated poly(aryl ether) (FPAE). In this work, zirconium tungstate (ZrW2O8) with negative thermal expansion (NTE) modified by thiol groups is successfully obtained by surface modification with 3‐(trimethoxysilyl)‐1‐propanethiol. Then, the dispersion of ZrW2O8 is improved and a certain crosslinked structure is formed by click reaction between thiols on the surface of ZrW2O8 and allyl groups on the backbone of FPAE. On this basis, the residual allyl groups on the FPAE can undergo addition reaction under heating conditions to further form crosslinked structure. Due to the introduction of photo‐thermal dual crosslinked structure, the dimensional stability of FPAE is significantly improved, and the coefficient of thermal expansion decreased by 64.3% compared to the unoptimized samples. Meanwhile, the dielectric properties are characterized with dielectric constant and dissipation factor of 3.70 and 0.008 at 1 kHz. Finally, the prepared film is used to assemble triboelectric nanogenerators, where the short‐circuit current, open‐circuit voltage and transferred charge is 3 μA, 30 V, and 10 nC, respectively. Crosslinked FPAE with high dimensional stability and high temperature resistance are successfully gained by avoiding the complexity of monomer synthesis and realizing higher performance with the same inorganic filler loading.Highlights Dual crosslinked structure is built by photo‐thermal dual crosslinking reaction. ZrW2O8 gains homogeneous dispersion in polymer matrix by photo‐crosslinking reaction. Introducing ZrW2O8 and dual crosslinked structure raises dimensional stability of film.

show abstract

“…1 The versatility of PTFE can be seen in many applications, such as additives, gaskets, low-friction materials, and electronics. [2][3][4][5] Stemming from this polymer, a derivative form of PTFE called expanded polytetrafluoroethylene (ePTFE), is produced by mechanically stretching (expansion) of PTFE to create a highly porous structure. First pioneered by Gore,6 this version of PTFE exhibits increased flexibility and porosity, making it attractive to many applications such as filtration and breathable fabrics as well as medical devices and implants.…”

mentioning

confidence: 99%

A double‐expanded polytetrafluoroethylene fabrication method for increased mechanical compliance in tubular vascular graft applications

Chen,

Turng

2024

Polymer Engineering & Sci

View full text Add to dashboard Cite

A novel manufacturing technique has been developed to enhance the compliance of expanded polytetrafluoroethylene (ePTFE) for vascular graft applications. This new method involves modifying the existing processing procedures by introducing an additional expansion step while using a lower temperature during the first expansion stage. The new process results in the production of highly compliant ePTFE grafts without the need for supplementary additives or inherent material alterations. Tensile testing in both the longitudinal and circumferential directions as well as cyclical tensile testing were conducted to characterize the mechanical properties of double‐expanded ePTFE grafts prepared using varying expansion ratios. The double‐expanded ePTFE grafts consistently outperformed the prevailing, single‐expanded counterparts in both tensile stress tests and cyclical assessments of its elastic compliance. Notably, the double‐expanded ePTFE samples exhibited the desirable, biomimetic “toe‐region” and an elastic strain capacity of up to 50%, comparable to native vascular materials. Scanning electron microscopy (SEM) imaging was used to examine the morphological characteristics of the wavy fibers within the double‐expanded PTFE samples, which contributed to the enhanced compliance that is needed for vascular graft applications.Highlights A new process has been developed for expanded polytetrafluoroethylene (ePTFE). This new process involves an additional expansion step at a lower temperature. This new process results in the production of highly compliant ePTFE grafts. Double‐expanded D‐ePTFE grafts outperform the single‐expanded counterparts. D‐ePTFE grafts exhibit an elastic strain capacity similar to native vasculature.

show abstract

Composite films with low dielectric constant and dielectric loss factor at high frequency prepared from polyimide and polytetrafluoroethylene

Cited by 17 publications

References 41 publications

Investigation on flame‐retardant, thermal and mechanical properties of glass fiber reinforced polyimide composites

Investigation on flame‐retardant, thermal and mechanical properties of glass fiber reinforced polyimide composites

Preparation of fluorinated poly(aryl ether) with high dimensional stability and high temperature resistance by photo‐thermal dual crosslinking reaction

A double‐expanded polytetrafluoroethylene fabrication method for increased mechanical compliance in tubular vascular graft applications

Contact Info

Product

Resources

About