Facile functionalization strategy of PBO fibres for synchronous improving the mechanical and wave-transparent properties of the PBO fibres/cyanate ester laminated composites

Tang, Lin; Yang, Zhiyong; Zhang, Junliang; Kong, Jie; Gu, Junwei

doi:10.1016/j.compositesa.2021.106622

Cited by 41 publications

(16 citation statements)

References 44 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In principle, the polarization mechanism of polymers includes electronic polarization, atomic polarization, and orientation polarization . Among them, the dipole orientation polarization has the greatest influence on the dielectric properties of materials. , The cross-linked structure can effectively hinder the electron mobility of the PI molecular chains, further preventing the electron cloud of PI molecular chains being polarized by external electric or electromagnetic fields, causing an obvious decrease in the dielectric constants of cross-linked and rigid PI-based composite foams . The transmission state of electromagnetic waves in the medium is usually characterized in terms of wave transmission coefficient ( T ).…”

Section: Resultsmentioning

confidence: 99%

Cross-Linked and Rigid Polyimide Composite Foams with Prominent Fire Resistant, Thermal Insulating, and Wave-Transparent Properties

Lin

Wang

et al. 2022

ACS Appl. Polym. Mater.

View full text Add to dashboard Cite

High-performance and light-weight polymer foams with ultralow dielectric constant, good thermal stability, and high mechanical strength are greatly needed in aviation and aerospace fields. In this work, cross-linked and rigid polyimide (PI) composite foams were fabricated based on norbornene terminated polyamide ester oligomer precursor powders via thermal foaming method. The obtained PI composite foams exhibit outstanding characteristics of light weight (90–130 kg·m–3) and high mechanical strength. When the glass fiber (GF) loading was 10 wt %, the compressive strength and modulus of PI/GF composite foams reached 1.7 and 49.6 MPa, respectively. Moreover, the PI foams exhibit remarkable thermal stability and fire-resistant property (LOI > 42%). The thermal conductivity of the prepared PI foams was measured to be in the range of 0.039–0.052 W·m–1·K–1 at room temperature. In addition, the PI composite foams present ultralow dielectric characteristic (tan δ = 0.006–0.008 at 10 GHz) and prominent wave-transparent performance (>95%) in the X band (8.2–12.4 GHz). These beneficial integrated properties enable the resultant PI composite foams to be attractive candidates for applications in aviation and aerospace fields.

show abstract

Section: Resultsmentioning

confidence: 99%

Cross-Linked and Rigid Polyimide Composite Foams with Prominent Fire Resistant, Thermal Insulating, and Wave-Transparent Properties

Lin

Wang

et al. 2022

ACS Appl. Polym. Mater.

View full text Add to dashboard Cite

show abstract

“…The silane CA solution of 4 wt% was prepared by adding silane CA to 95% ethanol. 27 Meanwhile, the pristine PI fibers and PI fibers treated with O 2 plasma for 18, 27, and 36 min were wound and fixed on a rectangular frame, and then soaked in the silane CA solution for 6 h at 25°C. Afterwards, the fibers were washed three times with deionized water and dried in an oven at 100°C for 4 h. No significant difference between pristine and treated fibers was observed by visual inspection.…”

Section: Methodsmentioning

confidence: 99%

“…15 –26 However, alkali treatment and thermal treatment will destroy the structure of PI fibers. Surface functionalization with polymer membranes can improve the interfacial properties between fiber and resin without impairing the mechanical properties of fibers, such as dopamine, silane CA, 27 and different random copolymers. 28 Liu et al.…”

mentioning

confidence: 99%

Surface modification of polyimide fibers for high-performance composite by using oxygen plasma and silane coupling agent treatment

Cheng

Shao

Chen

et al. 2022

Textile Research Journal

View full text Add to dashboard Cite

In this study, the oxygen plasma and silane coupling agent composite treatment was used to modify the polyimide fiber surface to improve the interfacial properties. The oxygen plasma treatment introduced active groups on the fiber surface, which facilitated the grafting of silane coupling agent to the fiber surface. The surface morphology and chemical composition of fibers were characterized by scanning electron microscope and X-ray photoelectron spectroscopy. The results showed that after plasma treatment, the etching spots on the fiber surface increased with the plasma treatment time, and the surface O atom content, O/C ratio and C–O(H) bond ratio reached the highest value at 27 min plasma treatment. After the composite treatment, the surface Si atomic content reached the highest value after 27 min plasma pretreatment. Moreover, polyimide/polyamic acid unidirectional reinforced composites were prepared. In polyimide/polyamic acid composites, the interfacial shear strength of polyimide fibers first increased and then decreased with plasma treatment time, both in oxygen plasma treatment and in composite treatment, and increased by up to 36.98% and 61.68% respectively compared. In addition, the transverse tensile strength of polyimide/polyamic acid composites increased by 103.73% after composite treatment compared with the pristine specimens.

show abstract

“…As shown in Figure 9, there are no other absorption peaks except for the characteristic absorption peaks of -OH at 3400 cm À1 , which indicates that organic groups in PBO aerogels basically burns during the combustion process, and only the porous residual carbon and adsorbed moisture. However, the characteristic peaks of Si-O-Si at 1115 cm À1 and 463 cm À1 still exist in SiO 2 -PBO-C. [36][37][38] Moreover, the characteristic peaks of the benzene ring (1500 cm À1 ) and C-H (827 cm À1 ) bond also exist, indicating that the structure of benzene ring has not been destroyed completely in SiO 2 -PBO-C, 7,34,35 and further justifying that SiO 2 -PBO aerogels have superior flame retardancy, high temperature oxidation resistance.…”

Section: Flame-retardant Property and Speculated Mechanism Of Sio 2 -...mentioning

confidence: 98%

Excellent antioxidizing, thermally insulating and flame resistance silica‐polybenzoxazine aerogels for aircraft ablative materials

Xiao

Liu

et al. 2022

J of Applied Polymer Sci

View full text Add to dashboard Cite

High‐performance thermal protective composites with lightweight, micro‐ ablation and high‐efficient thermal insulation are urgently required for thermal protection systems in advanced hypersonic speed vehicles. However, the practical applications of thermal protective composites have long been hampered by the main issues such as low mass residual rate and poor long‐term antioxidation of the matrix in high‐temperature aerobic environments. Here, we report a novel silica‐polybenz oxazine (SiO2‐PBO) aerogels with interpenetrated networks, possessing the ability to antioxidation, thermal insulation, and flame‐retardant properties. The resulting SiO2‐PBO aerogels exhibit low density (0.25 g/cm3), low thermal conductivity (0.035 W/(m·K)), and superior peak heat release rate value (15.3 W/g). Moreover, the mass residual rate is up to 70.46 wt% in the N2 atmosphere and remains 57.83 wt% despite existing in the air atmosphere and experiencing the highest temperature of 800°C. Briefly, SiO2‐PBO aerogels as‐prepared could be a potential matrix for a new gene ration of high‐performance thermal protective composites in the future.

show abstract

Facile functionalization strategy of PBO fibres for synchronous improving the mechanical and wave-transparent properties of the PBO fibres/cyanate ester laminated composites

Cited by 41 publications

References 44 publications

Cross-Linked and Rigid Polyimide Composite Foams with Prominent Fire Resistant, Thermal Insulating, and Wave-Transparent Properties

Cross-Linked and Rigid Polyimide Composite Foams with Prominent Fire Resistant, Thermal Insulating, and Wave-Transparent Properties

Surface modification of polyimide fibers for high-performance composite by using oxygen plasma and silane coupling agent treatment

Excellent antioxidizing, thermally insulating and flame resistance silica‐polybenzoxazine aerogels for aircraft ablative materials

Contact Info

Product

Resources

About