REACTIVE & FUNCTIONAL POLYMERS
·
2019
·
IF 3.074
Yubin Li,Zhijian Yang,Ling Ding,Liping Pan,Jianhu Zhang,Xue Zheng,Congmei Lin
Damages generated in functional materials can deteriorate their performance and shorten their lifetime, endowing the materials with self-healing ability is expected to resolve this problem. In this work, a novel energetic composite refers to CL-20 based PBX, which can self-heal its mechanical damage under a mild condition, was designed and prepared via incorporating disulfide bonds into the polymeric binder. The highly efficient self-healing polyurethane-urea containing disulfide bonds (DSPU) was synthesized by using the prepolymer of poly(caprolactone) diol (PCL-diol) with isophorone diisocyanate (IPDI) as the main-chain to achieve good mechanical toughness, then cross-linking with bis(4-aminophenyl) disulfide (APD) to gain the superior reversibility. The CL-20 based PBX using this DSPU as binder can evidently self-heal its inner damage, i.e. micro-crack, after heating at 60 °C for several hours, and the strength of the damaged sample after Brazilian test can also be recovered to more than 70% of the pristine value.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2023
·Vol. 30
·期 6
·1-17
·
IF 2.8
Lin Gao-Ming,Wang Su-Wei,Xiao Lei,Hu Yu-Bing,Hao Ga-Zi,Guo Hu,Zhang Guang-Pu,Jiang Wei
To tackle challenges of man-machine contact, manual operation, and low degree of mechanical automation in the charging process of traditional polymer bonded explosive (PBX), we adopted a vertical extrusion charging process to realize continuous extrusion charging of the slurry into missiles. In this work, the screw structures were optimized via simulation software after slurry physical property analysis, as well as the influence of the parameters including speed and temperature on the process was further explored. The results indicated that, compared with the pineapple head structure featuring a high shear function, the conventional three-piece screw structure maintains the moderate fluctuation in viscous heating of the slurry, which is suitable for stable and safe delivery of high-sensitivity slurries. Meanwhile, an appropriate outlet size φ and barrel cone angle θ contributes to pressure distribution manipulation in the flow path, and a relatively high output was obtained at 30 mm and 1°, respectively. Additionally, the adjustment of process parameters such as speed and temperature is conducive to reducing occurrence probability of local hot spots and restraining deformation of screw blade structures, the balance between output and process hazard was achieved.
研究领域:
机械工程
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材料科学
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炸药技术
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产品关联
DOI
高影响因子
POLYMER
·
2022
·
IF 4.432
Chao Deng,HuiHui Liu,YuTao Cui,XiaoNan Zhu,YongPing Bai,Zhen Hu
This work provides an energy saving strategy for strengthening and toughening fluoroelastomer (linear F2314) by using liquid fluorine rubber (HTLF-700). A series of semi-interpenetrating polymer networks based on the F2314 and the crosslinked HTLF-700 (namely F23-CLF-X semi-IPNs) were firstly prepared at low temperatures and characterized using FTIR , SEM, EDS , TGA , DSC , DMA and tensile testing et al. The as-prepared F23-CLF-30 semi-IPNs film possessed well interpenetrating co-continuous phases and thus exhibited prominent mechanical performance with the higher tensile strength (33.0 MPa), the larger elongation at break (165.0%), the better mechanical stability at high and low temperature shock and the higher high-temperature creep resistance compared with the F2314. Meanwhile, the arc Brazilian test indicates that F23-CLF semi-IPNs could be a promising candidate as a polymer binder for polymer bonded explosive (PBX).
研究领域:
材料科学
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聚合物化学
·
爆炸工程
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产品关联
DOI
高影响因子
POLYMER
·
2025
·
IF 4.5
Shengjun Zheng,Chengcheng Zeng,Jianhu Zhang,Yajun Luo,Feiyan Gong,Fude Nie
Improving the interfacial interaction between explosive crystals and the polymeric binder was essential for enhancing the mechanical properties of polymer bonded explosives (PBXs). In this study, the surface of the 1,3,5-triamino-2,4,6-trinitrobenzene (TATB) crystal was initially coated with a polydopamine (PDA) layer, which served as an active platform for anchoring the 2-bromoisobutyryl bromide as an ATRP initiator; then, the co-polymer chains composed of Acrylonitrile(AN), 2-Hydroxyethyl methacrylate (HEMA) and 2-(Dimethylamino)ethyl methacrylate (DMAEMA) were grown through surface-initiated atom transfer radical polymerization (SI-ATRP) from the surface of TATB modified with ATRP initiator. The formation of the PDA, ATRP initiator and polymer brush coating layer on the surface of TATB was confirmed through SEM, TEM, XPS and contact angle tests. After incorporating a rigid-flexible gradient interface structure composed of PDA and polymer brush layer, the PBXs exhibited enhanced mechanical strength and creep resistance. Compared with the pristine TATB-based PBXs, the static mechanical properties, including tensile and compressive strength, of TATB@PDA@PAN-co-PHEMA-co-PDMAEMA based PBXs were increased by 36.7% and 23.9%, respectively. The maximum creep strain decreased by 39.4% at 30 °C and 14.6% at 75 °C. Additionally, the coefficient of thermal expansion decreased by 8.37%. This study presents an universal method for enhancing the mechanical properties of PBX by integrating PDA chemistry with SI-ATRP.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
PROPELLANTS EXPLOSIVES PYROTECHNICS
·
2021
·Vol. 46
·期 12
·1837-1843
·
IF 1.887
Shuyi Duan,Feng Ding,Haitao Sun,Chun Xiao,Shangbin Li,Qing Zhu
To have a deep understanding of the effects of surface wettability on the mechanical sensitivity and rheological characteristics of PBX slurry, CL-20 particles with hydrophilic property was prepared through a polymerization process of dopamine, and CL-20 particles with hydrophobic property were prepared through a condensation polymerization process of hexadecyltrimethoxylsilane. The morphology, surface element content and surface wettability of CL-20 crystals before and after modification were characterized by scanning electronic microscope (SEM), X-ray photoelectron spectroscopy (XPS), and contact angle test. The rheological characteristics of CL-20 based PBX slurry showed that the interaction between explosive particles and binder was changed with different surface wettability of CL-20. The weaker interaction between CL-20@hydrophobic and binder lead to weaker solid-liquid friction, resulted in lower apparent viscosities of CL-20@hydrophobic based PBX slurry at high shear rate. The mechanical sensitivity of wax coated CL-20 with different surface wettability was tested. CL-20@hydrophobic-wax exhibited better mechanical stability compared to CL-20-wax and CL-20@hydrophilic-wax, probably owning to the weaker interaction between CL-20@hydrophobic surface and wax.
研究领域:
爆炸物化学
·
材料科学
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产品关联
DOI
高影响因子
Polymers
·
2019
·Vol. 11
·期 8
·1308
·
IF 3.164
Chengcheng Zeng,Zhijian Yang,Jianhu Zhang,Yubin Li,Congmei Lin,Guansong He,Xu Zhao,Shijun Liu,Feiyan Gong
The mechanical properties of composites are highly dependent on the interfacial interaction. In the present work, inspired by marine mussel, the adhesion between energetic crystals of 1,3,5-triamino-2,4,6-trinitrobenzene (TATB) and polymer binders was improved. Three types of linear polymeric agents of glycidyl azide polymer (GAP), polyethylene glycol (PEG), and polytetramethylene ether glycol (PTMEG) were grafted onto TATB particles bridged through polydopamine (PDA) films. SEM images showed that 5% grafting contents could evidently form roughness shells on the surface. With a reinforcement at the interface produced by grafting shells, the mechanical properties of polymer-bonded explosives (PBXs) exhibited outstanding mechanical performance, especially for the PTMEG-grafting sample. Examined by the contact-angle test, the PTMEG-grafting sample possessed a value of polar component similar to that of fluoropolymer, leading to an excellent wettability of the two phases. Additionally, different contents of PTMEG were grafted to reveal that the mechanical properties could be improved even with content as little as 0.5 wt.% PTMEG. These results might highlight a correlation between interfacial interaction and macroscopic properties for mechanically energetic composites, while providing a versatile route of grafting on highly loaded composites.Keywords:grafting;energetic crystals;PDA;mechanical properties
研究领域:
材料科学
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化学工程
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产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Cuihuan Lv,Jinpeng Cai,Guohui Wang,Jiuxiu Chen,Hao Lai,Peilun Shen,Dianwen Liu
Organic depressants often exhibit low selectivity at high dosages, and introduce risks of concentrate dewatering. The combined depressants composed of inorganic and organic substances can significantly reduce reliance on organic depressant dosage, providing a promising solution to this challenge. In order to achieve highly efficient separation of sphalerite and pyrite in the CuSO 4 -butyl xanthate (PBX) flotation system, the combined depressant Fe 2+ / baicalin (BCL) was innovatively employed to inhibit copper-activated pyrite. The flotation tests indicate that compared with the single depressant BCL, the combined depressant Fe 2+ /BCL demonstrates superior selective inhibitory effects on copper-activated pyrite. For artificially mixed ores, a zinc concentrate is obtained with a zinc grade of 62.33 % and a zinc recovery of 93.86 % when the combined depressant of 10 mg/L Fe 2+ and 5 mg/L BCL are used, and the separation efficiency is significantly improved from 40.66 to 79.69 %. Adsorption characteristic studies indicated that BCL exhibits stronger affinity for copper-activated pyrite than for sphalerite. The introduced Fe 2+ provide additional active sites, thereby enhancing the depression effect on copper-activated pyrite. Following Fe 2+ /BCL modification, the adsorption of PBX on copper-activated pyrite was hindered, while having no substantial impact of that on sphalerite, which is also confirmed by molecular dynamics simulations. Therefore, the combined depressant Fe 2+ /BCL markedly widened the hydrophobicity difference between sphalerite and pyrite, creating the potential for their effective separation.
研究领域:
矿物加工
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浮选化学
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表面化学
·
提取冶金
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产品关联
DOI
高影响因子
PROPELLANTS EXPLOSIVES PYROTECHNICS
·
2023
·Vol. 48
·期 4
·e202200154
·
IF 1.8
Chengcheng Zeng,Zongwei Yang,Jiahui Liu,Ling Ding,Shilong Hao,Feiyan Gong,Zhijian Yang
Low melting point compound MTNP was usually adopt to form co-crystal explosive with CL-20 to reduce sensitivity, and the co-crystal may have the potential of green engineering application. Improving mechanical properties of co-crystals explosive is one of the effective ways to broaden its practical application. In this work, CL-20/MTNP energetic co-crystal was selected to be coated by polydopamine (PDA) and neutral bonding agent (NBA), with enhanced mechanical properties and developed interfacial strength between crystal and binder. The TG-DSC curve showed that thermal decomposition of co-crystal explosives divided into two steps, and the melting point delayed to 210 °C compared with that of MTNP. After surface modification, the storage modulus of PBX was increased by more than 20 % at the temperature range of (25–120) °C, and creep strain was also effectively reduced. The Brazilian and compressive strength of PDA coating samples increased by 69.89 % and 210.53 % respectively, as well as improved elongation, leading to increased fracture toughness. Here, the highlighted modification on the surface of CL-20/MTNP co-crystal can be used as a reference insight to improve the mechanical properties of new explosives.
研究领域:
材料科学
·
爆炸物工程
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产品关联
DOI
高影响因子
MINERALS ENGINEERING
·
2026
·
IF 6
Wanting Yang,Chenxu Wang,Yuchen Shi,Hongchang Liu,Jun Wang
High Mg 2+ induces hydrophilic deposits that passivate malachite. • Mg 2+ deposition suppresses Cu–S film formation during sulfidization. • Mixed collectors improve malachite flotation in high-Mg 2+ recycled water. • XPS, SEM–EDS and ToF-SIMS reveal Mg coverage and Cu–S film evolution. The flotation recovery of malachite from complex polymetallic ores is often severely depressed by high concentrations of Mg 2+ in recycled water; however, the underlying mechanism and effective mitigation strategy remain unclear. In this study, microflotation experiments combined with surface characterization and spectroscopic analyses were conducted to elucidate the inhibitory role of Mg 2+ in malachite sulfidization flotation and to evaluate the performance of a mixed-collector system. The results showed that in the sodium hydrosulfide (NaHS)–potassium butyl xanthate/potassium amyl xanthate (PBX/PAX) system, increasing the Mg 2+ concentration from 0 to 100 mmol/L decreased malachite recovery by 37.13%. In contrast, the addition of benzohydroxamic acid (BHA) to the PBX/PAX system markedly improved flotation recovery under high-Mg 2+ conditions. Scanning electron microscopy coupled with energy-dispersive spectroscopy (SEM–EDS), zeta-potential, X-ray photoelectron spectroscopy (XPS), and time-of-flight secondary ion mass spectrometry (ToF-SIMS) revealed that Mg 2+ promoted the formation of a heterogeneous Mg(OH) 2 –Cu–S composite deposit layer on the malachite surface, which blocked active Cu sites and suppressed the formation of the Cu–S sulfidized film. Contact-angle and adsorption results further showed that the synergistic interaction between BHA and PBX/PAX accelerated and enhanced collector adsorption, leading to a more stable hydrophobic surface. Fourier transform infrared (FTIR) spectra indicated that xanthates chemisorbed on Cu–S sites through Cu–S–C bond formation, whereas BHA coordinated with surface Cu 2+ via Cu–O/N chelation. Their cooperative adsorption resulted in the formation of a Cu–S/Cu–O/N composite interfacial layer, which effectively alleviated Mg 2+ -induced surface passivation. These findings demonstrated that the mixed-collector system restored the hydrophobicity and flotation performance of malachite in high-Mg 2+ water through synergistic interfacial reconstruction.
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DOI
高影响因子
CRYSTENGCOMM
·
2024
·
IF 2.6
Chengwei Wang,Rui Wang,Yanan Liao,Kai Liu,Qingyi Zhang,Lei Wang,Dawei Gu,Feifei Qin,Feng Chen
PbX(OH) (X=Cl, Br, I) is considered one of the effective encapsulation matrixes to improve the stability and luminescence efficiency of perovskite. Several strategies have been explored to construct perovskite@PbBr(OH) composites with high photoluminescence quantum yield. However, there is limited research on their precise growth kinetics mechanism and morphology control. Here, PbBr2 microwires (MWs) were applied to act as the lead source and serve as a skeleton frame for the growth of CH3NH3PbBr3 (MAPbBr3) MWs. The structures transition from MAPbBr3 to MAPbBr3@PbBr(OH) MWs were triggered by the synergistic effect of H2O and CH3NH3OOCCH3 (methylamine acetate, MAAc). All components and synthesis processes used in this system are explicit which allows a more in-depth exploration of the MAPbBr3@PbBr(OH) formation kinetics. The results indicate that the hydrolysis of MAAc provides OH- and partly replaces Br- ions in MAPbBr3 to form MAPbBrxAc3-x intermediate, which induces the transformation of MAPbBr3 into PbBr(OH) and until the stable MAPbBr3@PbBr(OH) microwires are formed. Based on this growth kinetics process, utilizing H2O-MAAc and extra sodium halide (NaCl, NaI) mixture can synthesize MAPbBrnX3-n@PbX(OH) (X=Cl, I) microwires successfully. Our study can open a new avenue for developing high-efficiency and high-stability fluorescent hybrid perovskites for three primary color detectors, lasing cavities, and sensors.
研究领域:
材料科学
·
化学
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产品关联
DOI
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2026
·
IF 8.2
Chengcheng Zeng,Zijian Li,Wen Qian,Zhichao Zhu,Liangfei Bai,Sheng Zhong,Feiyan Gong,Fude Nie
The poor bonding of fluoropolymers had indeed affected the mechanical performance of explosive composite. Herein, two types of polythiourea (PT) binders with lined and crosslinking structures were utilized in polymer bonded explosives (PBXs). PT binders were uniformly coated on 2,4,6-trinitrobenzene-1,3,5-triamine (TATB), confirmed by the homogeneous distribution of sulfur (S) element in the molding powder. For creep resistance, PBX-PT-4 exhibited strain below 0.0006 at 60 °C and storage modulus of 6295 MPa at room temperature. Moreover, the mechanical properties showed that PBX-PT-2 possessed the maximum tensile strength of 10.49 MPa, which was about 54.7% enhancement than that of PBX-0. PBX-PT-2 and PBX-PT-4, owning entangled polymer chains, reached the maximum fracture energy with values of W b and W c increased by 205.3% and 93.8%, respectively. Meanwhile, structural characterization and simulation for PT-4 and PBX-PT-4 presented the fracture resistance and enhanced interfacial adhesion with TATB via intermolecular hydrogen bond, which effectively contributed to the remarkable improvement in mechanical properties. By using cross-linked PT as binders demonstrated in this study provided a important strategy for the design of PBXs and facilitated the achievement of ultra-high mechanical properties in composites.
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Shuai Ma,Jiushuai Deng,Dingquan Xing,Gen Huang,Tianyu Cheng,Di Zhang,Jianying Deng,Wenhui Zhong,Xincun Leng,Bofei Quan
It was previously understood that the smelting process involving high-graphite content sulfide concentrates would result in a chemical reaction with oxygen, which would subsequently release a significant amount of CO 2 . This not only contributes to environmental pollution but also hampers smelting efficiency and quality, consequently escalating smelting costs. Therefore, this work improved the purity of sulfide ores by flotation methods using environmentally friendly depressant to depress graphite. The results of the micro-flotation study reveal that the flotation separation of graphite and sphalerite mixed ore was best under the flotation reagent concentration system of 10 mg/L PBX, 10 mg/L CMC and 8 × 10 −5 mol/L CuSO 4 , and the flotation recoveries were 8.22 % and 79.24 %, respectively. Analyses conducted using FTIR and XPS reveals that PBX competed with CMC for the adsorption of Cu 2+ , and exhibited a stronger adsorption for Cu 2+ on the sphalerite surface compared to CMC, which increased the adsorption of PBX with the sphalerite surface. Meanwhile, the graphite is only affected by CMC, which results led to sphalerite surface hydrophobicity and graphite surface hydrophilicity for efficient separation. Further confirmation was provided by DFT and MD simulations that Cu 2+ were adsorbed on the graphite (001) surface through physical interactions. The adsorption order was as follows: CuOH + < Cu 2+ < Cu(OH) 2 . CMC chemisorbed with Cu 2+ on the graphite surface, resulting in an increase in the adsorbed content of CMC on the graphite surface and an improvement in the hydrophilicity of graphite. These results indicate that CMC effectively depress graphite during the flotation separation of graphite and sphalerite.
研究领域:
矿物加工
·
环境科学
·
化学工程
✓ 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）