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Nano-Micro Letters 2024年第2期16卷 423-437页

作者： Lin tang Kunpeng Ruan Xi Liu yusheng tang Yali Zhang Junwei Gu Chongqing Key Laboratory of Green Synthesis and Applications College of ChemistryChongqing Normal UniversityChongqing 401331People’s Republic of China Shaanxi Key Laboratory of Macromolecular Science and Technology School of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXi’an 710072People’s Republic of China

With the rapid development of 5G information technology,thermal conductivity/dissipation problems of highly integrated electronic devices and electrical equipment are becoming *** this work,“high-temperature solid-phase&diazonium salt decomposition”method is carried out to prepare benzidine-functionalized boron nitride(m-BN).Subsequently,m-BN/poly(pphenylene benzobisoxazole)nanofiber(PNF)nanocomposite paper with nacremimetic layered structures is prepared via sol–gel film transformation *** obtained m-BN/PNF nanocomposite paper with 50 wt%m-BN presents excellent thermal conductivity,incredible electrical insulation,outstanding mechanical properties and thermal stability,due to the construction of extensive hydrogen bonds andπ–πinteractions between m-BN and PNF,and stable nacre-mimetic layered ***λ∥andλ_(⊥)are 9.68 and 0.84 W m^(-1)K^(-1),and the volume resistivity and breakdown strength are as high as 2.3×10^(15)Ωcm and 324.2 kV mm^(-1),***,it also presents extremely high tensile strength of 193.6 MPa and thermal decomposition temperature of 640°C,showing a broad application prospect in high-end thermal management fields such as electronic devices and electrical equipment.

关键词： Poly(p-phenylene-2,6-benzobisoxazole)nanofiber Boron nitride Thermal conductivity Electrical insulation

Excellent electromagnetic wave absorption of MOF/SiBCN nanomaterials at high temperature

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Chinese Journal of Aeronautics 2021年第11期34卷 277-291页

作者： Chunjia LUO Peng MIAO yusheng tang Jie KONG MOE Key Laboratory of Material Physics and Chemistry under Extraordinary Shaanxi Key Laboratory of Macromolecular Science and TechnologySchool of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXi’an 710072China

Electromagnetic wave absorbing materials at high-temperature are urgently needed for stealth aircrafts or aero-engines worked in harsh *** this contribution,cobaltcontaining siliconboron carbonitride(MOF/SiBCN)nanomaterials were prepared by pyrolyzing metal–organic framework,*** 2-methylimidazole(ZIF-67),and hyperbranched *** rhombic dodecahedral ZIF-67 and cobalt element promoted in situ formation of dielectric loss phases,including SiC nanocrystals,CoSi nanocrystals and turbostratic *** ZIF-67/SiBCN nanomaterials showed excellent microwave absorption both at room and elevated *** minimum reflection coefficient(RC_(min))was-51.6dB and effective absorption bandwidth(EAB)is 3.93GHz at room *** an elevated temperature of 600℃,the RC_(min) reached-30.29 dB and EAB covered almost the whole X-band(3.95GHz,8.45–12.4GHz).The ZIF-67/SiBCN nanocomposites are promising and useful platform for microwave absorbing materials at *** may shed light on the downstream applications in designing next generation areo-engines and stealth aircrafts.

关键词： Electromagnetic wave absorption High temperature resistance Metal-organic framework Polymer-derived ceramics Siliconboron carbonitride

Polymer matrix wave-transparent composites:A review

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Journal of Materials Science & Technology 2021年第16期75卷 225-251页

作者： Lin tang Junliang Zhang yusheng tang Jie kong Tianxi Liu Junwei Gu Shaanxi Key Laboratory of Macromolecular Science and Technology School of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXi'an 710072China State Key Laboratory for Modification of Chemical Fibers and Polymer Materials Donghua University.Shanghai 201620China School of Materials Science and Engineering Henan University of Science and TechnologyLuoyang 471023China

With the rapid development of electronic information technology,antenna systems in the fields of aviation,aerospace,transportation,and 5 G communication services are becoming more and more intensive and *** matrix wave-transparent composites with lightweight,low dielectric constant(∈)and dielectric loss tangent(tanδ),high temperature resistance,and excellent mechanical properties are urgently needed in order to ensure high-fidelity transmission of electromagnetic wave and protect antenna systems from external *** review introduces the wave transmission mechanism,key compositions(polymer matrix&reinforced fibers),and several typical testing methods for dielectric properties of polymer matrix wave-transparent composites,mainly elaborates the latest research progress and achievements of polymer matrix wave-transparent composites from polymer matrix,reinforced fibers and their surface functionalization methods,and presents the key scientific and technical problems that need to be solved urgently in the application of polymer matrix wave-transparent composites in the antenna ***,the future development trends and application prospects of the polymer matrix wave-transparent composites are also proposed.

关键词： Polymer matrix wave-transparent composites Reinforced fibers Surface functionalization Testing methods Application prospect

Polysilsesquioxane‑PBO Wave‑Transparent Composite Paper with Excellent Mechanical Properties and Ultraviolet Aging Resistance

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Advanced Fiber Materials 2023年第6期5卷 2114-2126页

作者： Yuhan Lin Xiaoli Fan Lin tang yusheng tang Junwei Gu Shaanxi Key Laboratory of Macromolecular Science and Technology School of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXi’an 710072ShaanxiPeople’s Republic of China State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi’an 710072ShaanxiPeople’s Republic of China Chongqing Key Laboratory of Green Synthesis and Applications College of ChemistryChongqing Normal UniversityChongqing 401331People’s Republic of China

The rapid development of radar antenna systems to meet requirements for high integration and precision places stringent requirements on the dielectric properties,mechanical properties and heat resistance of wave-transparent composite *** this paper,poly(p-phenylene-2,6-benzobisoxazole)(PBO)fibers are first dissolved by trifluoroacetic acid/methyl sulfonic acid to obtain PBO nanofibers(PNF),and the amino polysilsesquioxane(NH_(2)-POSS)is dispersed uniformly inside the PNF via ultrasonic-assisted and *** POSS-PNF composite paper is fabricated by the method of“suction filtration and hot-pressing”.Because of the uniformly dispersion of NH_(2)-POSS,the POSS-PNF composite paper has a low dielectric constant(ε,2.08)and dielectric loss tangent(tanδ,0.0047),and the wave-transparent coefficient(|T|2)is 96.7%(1 MHz),which is higher than that of PNF paper(95.5%,1 MHz).Additionally,the POSS-PNF composite paper possesses excellent tensile strength of 163.3 MPa,tensile modulus of 6.9 GPa,toughness of 9.1 MJ/m^(3),outstanding flame retardancy and excellent UV aging *** to a simulation of the radome honeycomb panel,POSS-PNF composite paper has low loss and reflections of electromagnetic waves in the X-band(8.4~12.4 GHz),and wide angle of incidence(0°-80°),which favor high|T|*** results indicate that the POSS-PNF composite paper has excellent potential for applications in the fields of aerospace,wearable flexible electronic devices and 5G communication.

关键词： PBO nanofibers POSS Wave-transparent Tensile strength

Ultraflexible,highly efficient electromagnetic interference shielding,and self-healable triboelectric nanogenerator based on Ti_(3)C_(2)T_(x) MXene for self-powered wearable electronics

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Journal of Materials Science & Technology 2022年第5期100卷 1-11页

作者： Yuzhang Du Xudong Wang Xingyi Dai Wenxuan Lu yusheng tang Jie Kong Shaanxi Key Laboratory of Macromolecular Science and Technology School of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXi’an 710072China

Integrating smart functions into one flexible electronic is vastly valuable in improving their working performances and broadening ***,this work reports a ultraflexible,highly efficient electromagnetic interference(EMI)shielding,and self-healable triboelectric nanogenerator(TENG)that is assembled by modified Ti_(3)C_(2)T_(x) MXene(m-MXene)-based nanocomposite *** from the excellent electronegativity of m-MXene,the single-electrode mode-based TENG can generate high open-circuit voltage(V_(oc))oscillating between-65 and 245 V,high short-circuit current(I_(sc))of 29 μA,and an instantaneously maximum peak power density of 1150 mW m^(-2) that can power twenty light-emitting diodes(LEDs).Moreover,the resultant TENG possesses outstanding EMI shielding performance with the maximum shielding effectiveness of 48.1 dB in the *** enhanced shielding capability is dominated by the electromagnetic absorption owning to high conduction loss in m-MXene network,multiple reflections between m-MXene sheets,and polarization effect on the surface of m-MXene ***,a self-powered wearable sensor is fabricated based on the as-prepared *** sensor shows an intrinsic healing ability with healing efficiency of 98.2% and can accurately detect the human large-scale motions and delicate physical *** work provides an enhanced way to fabricate the wearable electronics integrated with smart functions,and the reported MXene-based TENG may have a broad prospect in the fields of aerospace,artificial intelligence,and healthcare systems.

关键词： MXene Triboelectric nanogenerator(TENG) Wearable electronics Electromagnetic interference(EMI) Self-healing

Block copolymer functionalized quartz fibers/cyanate ester wave-transparent laminated composites

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Journal of Materials Science & Technology 2023年第8期139卷 189-197页

作者： Jiani Zhang Zheng Liu Muyi Han Junliang Zhang yusheng tang Junwei Gu Shaanxi Key Laboratory of Macromolecular Science and Technology School of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXi’an 710072China Queen Mary University of London Engineering School Northwestern Polytechnical UniversityXi’an 710072China

A block copolymer of PDMS-b-PGMA is synthesized by polymerizing glycidyl methacrylate(GMA)via reversible addition-fragmentation chain transfer(RAFT)polymerization applying a polydimethylsiloxane(PDMS)based macro-RAFT agent,which is then performed to functionalize the quartz fibers(QFs@PDMS-b-PGMA)via a simple coating ***,the QFs@PDMS-b-PGMA/bisphenol A dicyanate ester(BADCy)wave-transparent laminated composites are fabricated by high-temperature *** magnetic resonance(NMR)spectroscopy,Fourier transform infrared(FT-IR)spectroscopy and size ex-clusion chromatography(SEC)demonstrate the successful preparation of PDMS-b-PGMA with expected *** the molar mass and coating amount of PDMS-b-PGMA are respectively 8100 g/mol and 2.0 wt.%,QFs@PDMS-b-PGMA/BADCy wave-transparent laminated composites present optimal mechan-ical properties and wave-transparent *** interlaminar shear strength(ILSS)and flexural strength are 53.6 and 552.0 MPa,***,the dielectric constant and dielectric loss val-ues are 2.61 and 0.0028 at 1 MHz(wave transmittance of 93.8%),showing good stability at different frequencies(102-106 Hz and 8.4-12.4 GHz)and temperatures(25-250℃).

关键词： Bisphenol A dicyanate ester(BADCy)resins Quartz fibers(QFs) Wave-transparent laminated composites Block copolymer

PBO fibers/fluorine-containing liquid crystal compound modified cyanate ester wave-transparent laminated composites with excellent mechanical and flame retardance properties

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Journal of Materials Science & Technology 2023年第21期152卷 16-29页

作者： Zheng Liu Xiaoli Fan Junliang Zhang Lixin Chen yusheng tang Jie Kong Junwei Gu Shaanxi Key Laboratory of Macromolecular Science and Technology School of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXi’an 710072China State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi’an 710072China

Bisphenol A dicyanate ester resins modified by fluorine-containing liquid crystal compound(LCFE)are applied as polymer matrix(LCFE-BADCy),poly(p-phenylene-2,6-benzobisoxazole)(PBO)fibers as rein-forcements,and fluorine/adamantane PBO precursor(pre FABPBO)as interfacial compatibilizer to prepare the corresponding PBO fibers/FABPBO/LCFE-BADCy wave-transparent laminated *** could improve the order degree of BADCy cured network,in favor of enhancing the wave-transparent perfor-mance,mechanical properties,and intrinsic thermal *** dielectric constant and dielectric loss of PBO fibers/FABPBO/LCFE-BADCy composites are highly temperature(25–200℃)and frequency(10^(4)–10^(7) Hz and 8.2–12.4 GHz)stable with the value of 2.49 and 0.003 under 10^(6) Hz at 25℃,and the corresponding wave transmission efficiency is 95.0%,higher than that of 92.5%for PBO fibers/BADCy *** interlamellar shear strength and flexural strength are respectively 50.7 MPa and 682.5 MPa,38.1%and 16.2%higher than those of PBO fibers/BADCy ***,the volume resistivity,breakdown voltage,heat resistance index,glass transition temperature,flame retardant grade,and ul-timate oxygen index of PBO fibers/FABPBO/LCFE-BADCy composites are respectively 5.3×10^(15)Ωcm,29.75 kV/mm,217.2℃,245.7℃,V-1 grade,and 33.6%,expected to be performed as a new generation of“lightweight/loading/wave-transparent”electromagnetic window materials in advanced military weapons and civil communication base station.

关键词： Bisphenol A dicyanate ester(BADCy)resins Fluorine-containing liquid crystal compound Poly(p-phenylene-2,6-benzobisoxazole) (PBO)fibers Fluorine/adamantane PBO precursor Wave-transparent laminated composites

Hybrid Polymer Membrane Functionalized PBO Fibers/Cyanate Esters Wave‑Transparent Laminated Composites

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Advanced Fiber Materials 2022年第3期4卷 520-531页

作者： Zheng Liu Xiaoli Fan Lei Cheng Junliang Zhang Lin tang yusheng tang Jie Kong Junwei Gu Shaanxi Key Laboratory of Macromolecular Science and Technology School of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXi’anShaanxi 710072People’s Republic of China State Key Laboratory of Solidifcation Processing Northwestern Polytechnical UniversityXi’anShaanxi 710072People’s Republic of China Aerospace Research Institute of Materials and Processing Technology Beijing 100076People’s Republic of China

Hybrid polymer membrane(TA-APTES),synthesized by tannic acid(TA)and aminopropyl trethoxysilane(APTES)based on the Schif’s base and Michael addition reaction,is deposited on the surface of poly(p-phenylene-2,6-benzobisoxazole)(PBO)fbers,and then grafted with epoxy-terminated polysesquisiloxane(POSS)to obtain POSS-g-PBO@TA-APTES *** POSS-g-PBO@TA-APTES fbers reinforced bisphenol A dicyanate ester(BADCy)resins(POSS-g-PBO@TAAPTES fbers/BADCy)wave-transparent laminated composites are *** interlaminar shear strength and fexural strength of POSS-g-PBO@TA-APTES fbers/BADCy composites are respectively enhanced from 36.7 and 587.4 MPa to 42.8 and 645.8 MPa,increased by 16.6%and 9.9%compared with those of PBO fbers/BADCy *** 1 MHz,the corresponding dielectric constant and dielectric loss are reduced to 2.85 and 0.0047,respectively,lower than those of PBO fbers/BADCy(3.06 and 0.006)***,the simulated wave transmittance rate of POSS-g-PBO@TA-APTES fbers/BADCy composites with the thicknesses of 1.5–3.5 mm is higher than 86.2%at 0.3–40 *** volume resistivity and breakdown strength of POSS-g-PBO@TA-APTES fbers/BADCy composites are 2.8×10^(15)Ω·cm and 19.80 kV/mm,higher than PBO fbers/BADCy composites(2.2×10^(15)Ω·cm and 17.69 kV/mm),*** the corresponding heat resistant index is 221.5℃,lower than PBO fbers/BADCy composites(229.6℃).

关键词： Poly(p-phenylene-2,6-benzobisoxazole)fbers Bisphenol A dicyanate ester resins Wave-transparent laminated composites Interlaminar shear strength Surface functionalization

High-strength super-hydrophobic double-layered PBO nanofiberpolytetrafluoroethylene nanocomposite paper for high-performance wave-transparent applications

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Science Bulletin 2022年第21期67卷 2196-2207页

作者： Lin tang yusheng tang Junliang Zhang Yuhan Lin Jie Kong Kun Zhou Junwei Gu Shaanxi Key Laboratory of Macromolecular Science and Technology School of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXi’an 710072China School of Mechanical and Aerospace Engineering Nanyang Technological UniversitySingapore 639798Singapore

Poly(p-phenylene-2,6-benzobisoxazole)nanofiber(PNF)paper is facing unprecedented challenges in enhancing the interaction between the PNFs and improving its *** this work,a sol–gel film transformation approach was developed to fabricate high-strength PNF *** ions formed coordination bonds between PNFs to obtain a preforming three-dimensional,interconnective nanofiber ***,polytetrafluoroethylene(PTFE)particles were sprayed onto the surface of the paper,followed by thermal treatment to obtain double-layered PTFE-P/PNF nanocomposite *** nanocomposite paper presents incredible tensile strength(271.6 MPa,increased by 52.9%),folding endurance,super-hydrophobicity,and self-cleaning ***,it exhibits low dielectric constant(2.06)and dielectric loss tangent(0.0133)*** to the wave-transparent model for a doublelayered dielectric established by Maxwell’s equations,the wave-transparent coefficients of electromagnetic waves incident from both sides of the paper are 97.6%(PNF side)and 96.0%(PTFE/P(S-co-BCB-coMMA)side),*** PTFE-P/PNF nanocomposite paper possesses great potential in the fields of wave-transparent applications.

关键词： Poly(p-phenylene-2,6-benzobisoxazole) Coordination bonds Tensile strength Wave-transparent Super-hydrophobicity

Highly efficient and broad electromagnetic wave absorbers tuned via topology-controllable metal-organic frameworks

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Science China Materials 2020年第10期63卷 2050-2061页

作者： Peng Miao Jianxin Chen yusheng tang Kai-Jie Chen Jie Kong MOE Key Laboratory of Materials Physics and Chemistry in Extraordinary Conditions Shaanxi Key Laboratory of Macromolecular Science and TechnologySchool of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXi’an 710072China

Advanced electromagnetic(EM)wave absorbing materials with strong absorption and broad bandwidth are important for military stealth and elimination of microwave pollution in consumers’*** organic framework(MOF)-derived metal/carbon hybrids with ordered structure are significantly urgent in this *** this contribution,we presented a design strategy of hollow cage-like or solid box-like magnetic/dielectric Fe/Co/C and dielectric Fe/Mn/C EM wave absorbing nanomaterials via pyrolyzing Prussian blue’s analogs with controllable topology and phase *** solid box-like Fe/Co/C and hollow cage-like Fe/Mn/C showed favorable absorption property with a broad effective absorption bandwidth(EAB)and a low reflection loss(RL).Especially,the EAB of 8.8 GHz at a thickness of 2.5 mm for solid box-like Fe/Co/C nanocomplex prepared at 900℃is a new record for this type of *** design and tuning strategy for EM wave absorbers derived from topology-controllable MOF is important for EM functional materials possessing great potential in military stealth and consumers’electronics.

关键词： electromagnetic wave absorber MOF Prussian blue's analogs topology pyrolysis