COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
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2021
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IF 7.664
Zheng Liu,Xiaoli Fan,Junliang Zhang,Zhiyong Yang,Yusheng Tang,Jianwei Li,Jie Kong,Junwei Gu
Hyperbranched fluorine and epoxy containing PBO precursor (epoxy- pre FHBPBO) was synthesized and utilized as interface compatibilizer to synchronously improve the mechanical and dielectric properties of poly( p -phenylene-2, 6-benzobisoxazole) (PBO) fibres reinforced bisphenol A dicyanate ester (BADCy) resins (PBO fibres/FHBPBO- co -BADCy) laminated composites. 1 H NMR, 13 C NMR, and FTIR analyses confirmed the successful preparation of epoxy- pre FHBPBO. The introduction of hyperbranched structure and fluorine groups significantly improved the mechanical properties and wave-transparent performance. Compared with PBO fibres/BADCy, the flexural strength and interlaminar shear strength of PBO fibres/FHBPBO- co -BADCy composites with 7 wt% epoxy- pre FHBPBO were respectively enhanced to 634.9 and 46.9 MPa, increased by 8.1% and 27.8%. The corresponding dielectric constant and dielectric loss were 2.65 and 0.003, respectively, lower than those of PBO fibres/BADCy (3.06 and 0.006) composites. Meanwhile, the corresponding volume resistivity and breakdown strength were 4.93 × 10 15 Ω•cm and 25.38 kV/mm, higher than PBO fibres/BADCy resins composites (2.2 × 10 15 Ω•cm and 17.69 kV/mm).
研究领域:
材料科学
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复合材料
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高分子化学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Junping Shi,Lielin Wang,Hua Xie,Shidi Yao,Xiuqi Pu,Zhu Liu,Xiaojiang Chen,Yun Ding
Highly reactive fission product cesium may volatilize at high temperatures. PbO–B 2 O 3 –ZnO glass with low melting temperature and excellent chemical durability can be used as a potential matrix for immobilizing Cs. In this work, five PbO–B 2 O 3 –ZnO glasses with different contents of Pb were synthesized via a melt-quenching process. These specimens were characterized with XRD , Raman, DTA and viscosity measurements . The results showed that the melting temperature decreases, viscosity decreases and structural polymerization increases with increasing lead content. Cs-doped 35PbO–60B 2 O 3 –5ZnO glasses were synthesized at low temperatures. XRD results revealed the amorphous nature of the glass solidified bodies. EDS and ICP-MS studies confirmed that Cs is retained in the glass. Clear vitrified waste products containing up to 13.6 wt% Cs were obtained. The chemical durability of the samples was evaluated via PCT-A and MCC-1 method. For the glass solidified body comprising a Cs/matrix ratio of 0.136, the leaching rate of Cs was 1.6 × 10 −1 g m −2 d −1 from the PCT test, which indicates that it has a good chemical stability. 35PbO–60B 2 O 3 –5ZnO glass was expected to be a suitable matrix for Cs immobilization.
研究领域:
材料科学
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核废料管理
✓ 已验证
DOI
高影响因子
Chinese Journal of Aeronautics
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2020
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IF 2.215
Lin TANG,Junliang ZHANG,Junwei GU
Poly(p-phenylene-2,6-benzobisoxazole) (PBO) fibers possess excellent dielectric, mechanical properties and heat resistance. However, the surface of PBO fibers is smooth and highly chemical inert, resulting in poor interfacial compatibility to polymer matrix, which severely limits its wider application in high-performance fiber-reinforced resin matrix composites. In this work, random copolymers (P(S- co -BCB- co- MMA)) containing benzocyclobutene in the side-chain were synthesized by reversible addition-fragmentation chain transfer (RAFT) polymerization, which were then utilized to form dense random copolymer membrane on the surface of PBO fibers by thermally cross-linking at 250 °C (PBO@P fibers). Four kinds of synthesized P(S- co -BCB- co -MMA) with different number-average molar mass ( M n ) were well controlled and possessed narrow dispersity. When the M n was 32300, the surface roughness of PBO@P fibers was increased from 11 nm (PBO fibers) to 39 nm. In addition, PBO@P fibers presented the optimal interfacial compatibility with bisphenol A cyanate (BADCy) resins. And the single fiber pull-out strength of PBO@P fibers/BADCy micro-composites was 4.5 MPa, increasing by 45.2% in comparison with that of PBO fibers/BADCy micro-composites (3.1 MPa). Meantime, PBO@P fibers still retained excellent tensile strength (about 5.1 GPa). Overall, this work illustrates a simple and efficient surface functionalization method, which would provide a strong theoretical basis and technical support for controlling the surface structure & chemistry of inert substrates.
研究领域:
材料科学
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高分子化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
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IF 8.128
Yanling Wang,Zhaozhu Zhang,Mingming Yang,Junya Yuan,Peilong Li,Meng Liu
Co-MOF (cobased metal-organic frame) nanosheets were developed onto the surface of PBO (poly(p-phenylene benzobisoxazole)) fabric, and OMMT (modified montmorillonite) was incorporated into phenolic resin synergistically to improve the wear resistance of PBO/phenolic resin composites. Co-MOF nanosheets with a large specific surface area exhibited strong interlocking and excellent compatibility between the fabric and resin. In addition, OMMT possessed excellent affinity with phenolic resin and a larger lamellar space, and then polymer chains could be conveniently entangled into interlayers, which further confined the movement of molecular chains caused by friction heat. In addition, a weak interlayer force was conducive to facilitating the formation of a uniform and robust transfer-film on the counterpart. It was demonstrated that the Co-MOF@PBO/OMMT composites presented optimal tribological behavior due to the synergistic effect between interfacial modification and OMMT reinforcement.
研究领域:
材料科学
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表面工程
✓ 已验证
DOI
PubMed
高影响因子
POLYMER COMPOSITES
·
2025
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IF 4.7
Xuejiao Peng,Huiwen He,Yulong Liu,Meng Ma,Yanqin Shi,Yulu Zhu,Si Chen,Xu Wang
The rigidity and toughness of the resin matrix significantly influence the impact resistance of ballistic composites. However, the relationship between the properties of the resin matrix and the ballistic performance of the composites remains inadequately defined. In this study, the ballistic performance of composites with various matrix resins was investigated to assess how matrix toughness affects energy absorption. A series of epoxy resins exhibiting different rigidity and toughness were combined with PBO (poly-p-phenyl-2,6-benzobisoxazole) fibers, and their quasi-static mechanical properties were evaluated to analyze their effectiveness in resisting ballistic impacts. In ballistic test, the brittle matrix composite demonstrated concentrated fiber breakage and localized damage, while the toughened matrix composite exhibited more dispersed damage characterized by reduced fiber breakage and minimal delamination, suggesting enhanced energy absorption via deformation within the matrix. Compared with the specific energy absorption value of the brittle matrix composite material, which is only 9.28 Jm 2 /kg, the specific energy absorption value of the tough matrix composite material has increased by 125% to 20.88 Jm 2 /kg. These findings underscore the critical role that matrix toughness plays in improving ballistic-resistant performance by facilitating better energy distribution while mitigating fiber damage. Highlights Matrix toughness significantly enhances ballistic energy absorption in composites. Toughened matrix reduces fiber breakage and delamination under ballistic impact. Toughened matrix composite achieves a 125% higher specific energy absorption. Findings offer insights for designing high-performance ballistic-resistant materials.
研究领域:
材料科学
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力学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
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2014
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IF 5.211
Pengran Gao,Yi Liu,Weixin Lv,Rui Zhang,Wei Liu,Xianfu Bu,Guanghua Li,Lixu Lei
Three artificial mixtures of PbSO 4 and PbO 2 as well as the active materials obtained directly from the positive plates of spent batteries have been solvothermally treated in methanol at 140 °C for 24 h, which produce mainly PbO·PbSO 4 . The PbO·PbSO 4 can be easily desulphated with ammonium carbonate to produce PbCO 3 , which can be calcined to form α-PbO to be used as positive active material of lead acid batteries . The α-PbO powders are irregular particles and highly electrochemically active, which discharges around 165 mAh g −1 at 5 mA g −1 , 80 mAh g −1 at 200 mA g −1 and 60 mAh g −1 at 400 mA g −1 with excellent cyclic stability in 50 cycles. SEM investigations show that the as-formed PbO·PbSO 4 may inherit and enhance the morphological characteristics of PbSO 4 , and carbonation of PbO·PbSO 4 does not destroy the rod-like characteristics. For the active material from the positive plates of spent lead acid batteries, the discharge capacities are 170 mAh g −1 at the current density of 5 mA g −1 , and 60 mAh g −1 at 400 mA g −1 , which is also similar. In 50 cycles, its capacity loss is only 5%.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
PROGRESS IN NUCLEAR ENERGY
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2022
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IF 2.461
Yifeng Wang,Xiaobo Li,Ruixian Liang,Huiping Zhu,Hao Wu,Fang Liu,Yang Liu,Fenglei Niu
The lead oxide (PbO) ceramics play an important role in the solid-phase oxygen control system of the lead-cooled fast reactor. But sintering process and properties of PbO ceramics are rarely studied. In this paper, the effects of PVB addition on the mechanical properties and microstructure of PbO ceramics are studied. PbO ceramic specimens added with x wt.% (the value of x is 0, 1, 2, 4 or 6) PVB solution, a kind of binder, are fabricated, debonded and sintered at 620 °C. The results reveal that compared with pure PbO ceramics, the addition of PVB solution improves the mechanical properties such as hardness, flexural strength, density, and the microstructure of PbO ceramics according to scanning electron microscopy images. The optimal relative density and flexural strength are found to be 90.16% and 26.33 MPa with 4 wt% PVB solution, respectively. And the optimum hardness of 1212.58 MPa is achieved with 2 wt% PVB solution. Lastly, the sintered PbO particles are placed in a pool-type LBE flowing set-up to check the integrity of the shape and change of microstructure. The results of flushing experiment show that most PbO ceramics with PVB solution can maintain the shape integrity in spite of the appearances of some internal cracks.
研究领域:
材料科学
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核能工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Sustainable Metallurgy
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2024
·
IF 2.5
Yang Yi,Ouyang Lun-ao,He Yapeng,He Puqiang,Tu Jian,Huang Hui,Guo Zhongcheng
The hydrometallurgical recycling of spent lead-acid battery has received extensive attention benefitting from its features of cleanability and process controllability, but the process still suffers from significant challenges of huge chemical consumption and low economic efficiency. Here, a sustainable green approach that enables closed-loop recovery of leaching reagent NH 4 Ac to obtain high-purity PbO powder from discarded lead paste is proposed. The process includes dissolution, chemical transformation, carbonization, and calcination stages. Under the optimal leaching condition of NH 4 Ac concentration 4.5 mol L –1 , H 2 O 2 /PbO 2 molar ratio 1.5, reaction temperature 40 °C, and time 60 min, the leaching ratio of lead reaches as high as 99.35%. The exceptionally high concentration of NH 4 Ac to dissolve PbSO 4 phases than theoretical ratio could be attributed to the distribution state of Pb substances. With (NH 4 ) 2 CO 3 as carbonizing agent, above 99.9% of lead could be precipitated as PbCO 3 products when the molar ratio CO 3 2– /Pb is 1.2. High-purity β-PbO powder is subsequently achieved from the thermal decomposition of PbCO 3 precursor, where the effect of calcination temperature and atmosphere on the chemical compositions are examined. Economic analysis reveals the economic feasibility and profits of the recycling approach. The process produces high-purity PbCO 3 and PbO products enabling leaching reagents NH 4 Ac reuse, providing a practicable solution for sustainable recovery of lead from waste lead paste. Graphical
研究领域:
环境科学
·
冶金工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2013
·
IF 4.675
Pengran Gao,Weixin Lv,Rui Zhang,Yi Liu,Guanghua Li,Xianfu Bu,Lixu Lei
We have developed a novel route to make new batteries from spent ones, in which we obtain and regenerate the active materials of positive electrode and negative electrode respectively. For the spent lead acid batteries , the positive electrode active materials contain both PbSO 4 and PbO 2 . To make full use of them, we have to investigate the treatment of the mixtures rather than only PbO 2 , which we have reported previously. Here we report our investigation on three mixtures of PbSO 4 and PbO 2 in different mole ratios, as well as the electrode materials directly from the spent batteries. The mixtures are firstly desulphated, and then solvothermally processed in methanol at 140 °C for 24 h. The as-obtained solids contain both PbO·PbCO 3 and PbCO 3 , which have been calcined to form α-PbO. The α-PbO powders are similar irregular particles and highly electrochemically active, which discharge around 170 mAh g −1 at 5 mA g −1 , 80 mAh g −1 at 200 mA g −1 and 60 mAh g −1 at 400 mA g −1 with excellent cyclic stability in 50 cycles.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
POLYMER COMPOSITES
·
2024
·
IF 4.8
Bo Tian,Jie Zhao,Na Zhou,Jinfeng Li,Jizhuang Fan,Yunchen Du,Hongtao Zhao
Polymer-based radiation shielding materials are receiving more and more interests due to their desirable advantages in lightweight and maneuverability. Herein, we employ polypropylene (PP) as the matrix to construct γ -ray shielding composites through the embedment of PbO particles with a wet reaction melt blending method. From the changes in dynamic rheological behaviors and fracture surface of PP/PbO composite, it can be found that the gradient addition of PbO particles facilitates the formation of heterogeneous network structure with, and high PbO content may make the composites undergo a “liquid–solid” transition. Rheological temperature and time scanning show that both PbO content and heterogeneous network structure greatly contribute to the storage modulus ( G ') and thermal stability. The γ -ray ( 137 Cs) shielding tests manifest that BPP/PbO-4 has the best shielding performance, whose thicknesses of half value layer ( HVL ) and tenth value layer ( TVL ) are 0.32 and 1.05 cm, respectively, obviously smaller than those shielding materials ever reported. The analyses on effective atomic number ( Z eff ) and effective electron density ( N E ) reveal that the good shielding performance of BPP/PbO-4 benefits from its proper content and dispersion of PbO particles.
研究领域:
材料科学
·
辐射防护
✓ 已验证
产品关联
DOI
高影响因子
HIGH PERFORMANCE POLYMERS
·
2024
·
IF 1.8
Weihua Zhong,Jinwang Bai,Yunjun Luo,Dianbo Zhang,Chen Liang,Xiangdong Chen
Poly(p-phenylene-2,6-benzobisoxazole) (PBO) fiber is currently one of the best-performing organic fibers; however, its low UV aging resistance limits its use. To improve the UV aging performance of PBO fibers, a novel PBO-Fe-PDA fiber was created by depositing a biomimetic structure of polydopamine (PDA) on the surface of PBO fibers with the transition metal ion Fe3+ as the active center. The surface morphology and elemental composition of PBO-Fe-PDA fibers were investigated. It was revealed that Fe3+ formed a coordination bond structure with the oxazole ring, and PDA was successfully loaded onto the surface of PBO-Fe fibers. After UV aging, the crystallinity and crystallographic orientation of PBO fibers significantly decrease, microcrystals inside the fibers slip, and the size of microvoids in the fibers rises. As a result, the strength of PBO fibers was significantly decreased after UV aging. The anti-UV aging capacity of PBO-Fe-PDA fibers, on the other hand, has been enhanced, as evidenced by a slight drop in crystallinity and crystallographic orientation and a significant decrease in the size growth of internal microvoids in the fibers after UV aging. The tensile strength retention of PBO-Fe-PDA fibers after UV aging increased by 93.13% when compared to PBO fibers without altering the fibers’ initial strength. The testing results show that this surface modification method is simple to employ and extends the service life of PBO fibers significantly.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Huiwen He,Yulong Liu,Xuejiao Peng,Meng Ma,Yanqin Shi,Yulu Zhu,Si Chen,Xu Wang
The development of lightweight and high-performance fiber-reinforced composite protective equipment holds great significance for national defense and personal safety. Composite materials necessitate a matrix resin exhibiting both strength and toughness, while the design and application remains significant challenge. Herein, a new composite material with multi-scale energy dissipation structure is designed based on the failure mechanism of composite materials under impact, the impact resistance of the obtained material (129.2MJ·m −3 ) is significantly improved by 34 % compared with traditional composite material (96.5 MJ·m −3 ). The incorporation of epoxy vitrimer with dynamic non-covalent bonds imparts an impact-stiffening effect to the originally brittle matrix, thereby meeting higher requirements for impact resistance. The addition of carbon nanotubes in the epoxy vitrimer matrix improves its strength and toughness. The reinforcement consists of high-performance PBO fiber that is surface treated with oxygen plasma. The composite material exhibits excellent interface bonding, which directly contributes to the improvement of interlaminar shear strength from 7.84 MPa to 11.56 MPa. This composite material structure design based on multi-scale energy dissipation mechanism confirms the possibility of further lightweight and high-performance bulletproof composite materials.
研究领域:
材料科学
·
复合材料工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）