CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Wenjie Ma,Wenrui Cai,Wenhua Chen,Pengju Liu,Jianfeng Wang,Zhuoxin Liu
MXenes, a fast-growing family of two-dimensional (2D) materials, can offer an excellent electromagnetic interference (EMI) shielding performance because of ultra-high electrical conductivity, multi-layered structure, and abundant termination groups. In turn, as a result of the favorable interaction with electromagnetic wave, MXene might evoke an intense energy conversion from electromagnetic energy to thermal energy upon exposure to the microwave irradiation. Herein, for the first time, the microwave heating behavior of Ti 3 C 2 T x caused by the strong electromagnetic wave absorption was investigated. Ti 3 C 2 T x nanosheets were flocculation-assembled onto the surface of polypropylene (PP) and used as the “interfacial solder”, inducing a unique selective heating to construct a continuous and compact network in segregated Ti 3 C 2 T x /PP composite under the optimal microwave field. The sintered composite possessed the ultrahigh EMI shielding effectiveness (EMI SE) of 75.12 ~ 78.85 dB over the X-band with an extremely low Ti 3 C 2 T x loading of 1.138 vol%, superior to the vast majority of Ti 3 C 2 T x -based polymer composites. In addition, the compact Ti 3 C 2 T x frameworks also provided an excellent anti-dripping performance for composite even with 0.284 vol% Ti 3 C 2 T x . Therefore, by fully utilizing the intrinsic response of MXene to electromagnetic wave, we developed a novel method for not only process molding but also structural/chemical decoration of MXene-based materials.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
POWDER TECHNOLOGY
·
2022
·
IF 5.64
Jinyi Zhang,Jing Zuo,Wenhua Yuan,Wenjing Fu,Jiupeng Zhang,Cundi Wei
A conductive powder of coal gasification fine slag porous microbeads (CMs) coated with silver (Ag) nanoparticles was synthesized by a simplified electroless plating method. CMs were coated with uniform and dense Ag nanoparticles (Ag@CMs) to form a conductive structure consisting of internal conductive channels and a surface coating layer. The powder volume resistivity of Ag@CMs reached 1.47 Ω·cm. Subsequently, Ag@CMs were mixed with polypropylene (PP) to prepare an Ag@CMs@PP composite with a volume resistivity of 3.35 × 10 5 Ω·cm, a tensile strength of 26.06 MPa, and an elongation at break of 43.09%. Due to the high specific surface area (65.41 m 2 /g), small particle size (8.13 μm), and low density (1.51 g/cm 3 ) of Ag@CMs, the Ag@CMs@PP composite had better volume resistivity and mechanical properties than the PP composite filling with commercial silver-plated glass beads. The findings of this research could provide a theoretical foundation for future applications of Ag@CMs.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2023
·Vol. 15
·期 9
·2135
·
IF 5
Mingqiang Shao,Ying Li,Yiran Shi,Jiangtao Liu,Baoxia Xue,Mei Niu
It is difficult to enhance the char yields of polypropylene (PP) due to the preferential complete combustion. Successful formation of abundant char layer structure of PP upon flammability was obtained due to the synergistic effect of NiO, Al2O3and activated carbon (AC). From characterization of scanning electron microscopy (SEM) and transmission electron microscopy (TEM), it was revealed that the microstructure of residual char contained large amount of carbon nanotubes. Compared to the modification of AC, NiO and Al2O3alone, the combination of AC, NiO and Al2O3dramatically promotes the charring ability of PP. In the case of AC and NiO, NiO plays a role of dehydrogenation, resulting in the degradation product, while AC mainly acts as carbonization promoter. The addition of Al2O3results in higher dispersion and smaller particle size of NiO, leading to greater exposure of active sites of NiO and higher dehydrogenation and carbonization activity. Compared to the neat PP, the decomposition temperature of the PP modified by combined AC, NiO and Al2O3was increased by 90 ℃. The yield of residual char of AC-5Ni-Al-PP reached as high as 44.6%. From the cone calorimeter test, the heat release rate per unit area (HRR) and total heat release per unit area (THR) of PP composite follows the order AC-5Ni-Al-PP < AC-10Ni-Al-PP < AC-Ni-PP < AC-15Ni-Al-PP < AC-1Ni-Al-PP. Compared to the neat PP, the peak of HRR declined by 73.8%, 72.7%, 71.3%, 67.6% and 62.5%, respectively.Keywords:polypropylene composites;activated carbon;NiO;Al2O3;carbon nanotubes;flame retardancy;thermal stability
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MATERIALS SCIENCE FORUM
·
2020
·
IF 0
Nian Liang Gu,Jian Rong Wang,Cai Xia Chu,Juan Chen,Ke Li
In this paper, the effect of simulated seawater on properties of corn straw fibers (CSF) reinforced polypropylene composites was studied. Firstly, CSF was modified with nano-TiO2 particles, and then the modified CSF reinforced polypropylene (PP) composite was prepared. The flexural property and the microstructure of the composites before and after soaking simulated seawater for 21 days were investigated. The results showed that the simulated seawater in short-term immersion could play a role in plasticizing interface and improve the flexural property of CSF/PP composite. After 21 days of simulated seawater immersion, the flexural strength of CS/PP was increased by 18.00%. The modification of TiO2-CSF could improve the flexural property of CSF/PP composite. When the addition of TiO2 was 4 wt.%, the flexural strength reached 44.91 MPa, increased by 17.54% compared with that of unmodified composite.
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
MATERIALS SCIENCE FORUM
·
2020
·
IF 0
Min Gao
The jute and polypropylene fiber (PP) were formed into jute/PP composite by carding, netting and needling. Using surface dusting process, β-CD and ammonium phosphate (APP) were combined and hot pressed to form a flame-retardant layer on the surface of jute/PP composite. The results show that the thermal compression film formation on the surface of jute/PP composite after β-CD and APP compounding can significantly improve the flame retardancy and thermal stability of the jute/PP composite. When the mass ratio of β-CD to APP is 1:2 and keeping the 20wt% total content of the flame retardants, the jute/PP composite becomes extinguished after 58s combustion. The limiting oxygen index (LOI) value is 26.6%, which reaches the third fire resistance according to Japan's JISD 1201-77 standard. The heat release rate and effective combustion calorific show the lowest value and the carbon residual at 700°C is increased by 11. 68%.
研究领域:
材料科学
·
燃烧学
✓ 已验证
DOI
COMPOSITES PART B-ENGINEERING
·
2024
·
IF 12.7
Linmin Xia,Jianyu Wu,Han Wang,Zhijian Huang,Rilong Yang,Xuexia Zhang,Fei Guo,Jiqing Li,Yan Yu
Developing high-performance plant fiber-reinforced thermoplastic polymer composites using environmentally friendly and cost-effective methods remains a significant challenge. In this study, we present a novel micro-nano strategy for producing robust short bamboo fibers (BFs) reinforced polypropylene (PP) composites (SBFPCs) without the need for chemical modification. Our approach involves the utilization of purified short micron BFs, which is surface-coated with holocellulose nanofibers (HNFs) extracted from bamboo parenchyma cells (BP). Through conventional injection processing, the resulting SBFPCs demonstrate remarkable mechanical enhancements with just a 0.2 wt% addition of HNFs compared to control samples. Notably, the mechanical properties of our SBFPCs surpass those of most reported short plant fiber-reinforced thermoplastic composites. The superior mechanical performance of our SBFPCs can be attributed to several factors, including the use of purified micron BFs with optimal aspect ratios as the primary reinforcement phase, enhanced interfacial mechanical interlocking between BFs and the PP matrix facilitated by the addition of HNFs, and the potential dispersion of HNFs within the PP matrix at submicron or nanoscale as a secondary reinforcement phase. This study highlights the promising application of SBFPCs in engineering areas with stringent mechanical requirements.
研究领域:
材料科学
·
植物纤维复合材料
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Xi Yu,Lu He,Xiaofeng Zhang,Gege Bao,Rong Zhang,Xiaobei Jin,Daochun Qin
Bamboo fibers (BF), as an important sustainable natural material, are becoming a hot alternative to synthetic fibers for the reinforcement of polypropylene (PP)-based composites. However, the weak interfacial compatibility between BF and PP as matrix and their inherent flammability limit the practical application of BF/PP composites (BPC). Here, a fire-safe BPC was fabricated by constructing flame-retardant interfacial layers containing tannic acid (TA)-Fe 3+ complex and halloysite nanotubes (HNTs) on the fiber matrix followed by a hot-pressing process. The results showed that the interfacial chelating of TA with Fe 3+ improved the dispersion of HNTs on the fibers and the interfacial interactions within the fiber matrix, resulting in the as-fabricated composite with significantly improved mechanical properties and water resistance. In addition, the flame-retardant composite exhibited higher thermal stability and enhanced residual char content. Moreover, the composite possessed significant flame-retardant performances with a reduction of 23.75 % in the total heat release and 32.44 % in the total smoke production, respectively, owing to the flame retarding in gaseous phase and condensed phase of TA-Fe 3+ @HNTs layers. This work offers a green and eco-friendly strategy to address the inherent problems of BPC material in terms of fire safety and interfacial compatibility, thus broadening their applications in the automotive interior and construction industries.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
IEEE SENSORS JOURNAL
·
2024
·
IF 4.3
Tianqing Liu,Yutao Rong,Gandong Zhou,Guangjian Zhang,Chen Su,Peipei Li,Xiaoqiang Yin,Gang Wang,Weiwei Wu,Lu Zhang
Wearable humidity sensors have attracted extensive interest because of their affordability, high sensitivity, portability, and ease of use in the rapidly developing fields of noncontact medical diagnostics, healthcare monitoring, and environmental sensing. However, achieving a high-performance and stable wearable humidity sensor for healthcare monitoring, such as respiration, is still challenging. In this work, we propose a simple direct-writing method for the in situ fabrication of wearable resistive-type humidity sensors based on Ti3C2Tx metal carbides/nitrides (MXene). The sensing performance of MXene/PP composite-based humidity sensors has been thoroughly investigated, including sensitivity (0.601%/%RH), response/recovery time (17/37 s), and stability (20 h under 84% RH). Moreover, we demonstrate that the proposed wearable humidity sensor can accurately recognize different breathing patterns and monitor human respiration in real time, enabling the evaluation of physiological conditions for early warning. In addition, it can easily monitor sleep quality and rapidly identify any issues with mask use. Even more, an MXene/PP composite-based humidity sensor matrix can be applied for noncontact gesture tracing. Therefore, this work provides a practical solution for the fabrication of wearable, high-performance humidity sensors for individualized healthcare monitoring in real time, which paves a solid path for the creation of personalized healthcare monitoring devices.
研究领域:
材料科学
·
生物医学工程
·
传感技术
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2025
·
IF 3.9
Xiaojing Lv,Jiehao Dong,Minao Xia,Jin Li,Yufeng Shi,Cheng Zhang
Polypropylene composites are widely used for their excellent properties, but poor flame retardance is a major concern. The phosphorus content of the material in intumescent flame retardant (IFR) has a direct effect on retarding smoke and dehydrating to carbon during combustion. This study presents a hybrid flame retardant (MPA@ZrP-Zn) synthesized by noncovalent bonding between melamine and phytic acid molecules, containing a large number of phosphorus atoms in the system. Theoretical calculations confirm that the structure formed by zinc ions and melamine phytate (MPA) is more stable, and the overall electrophilicity index is at the level of a moderate Lewis acid. In addition, the Zr–Zn bimetallic effect significantly improves the drip resistance of IFR and reduces smoke emissions during combustion. UL-94 and LOI tests have shown that PP composites with MPA@ZrP-Zn (PPZn30) can achieve a V-0 rating and 33.5% of the LOI value. The THR and PHRR were 15.1% and 54.2% lower, respectively, for PPZn30 (compared to pure PP), and the ID/IG curves further indicate a higher degree of graphitization of the carbon layer in the combustion residue, which should be ascribed to the bimetallic effect. Therefore, this work puts forward a strategy to achieve high-performance PP composites with excellent flame retardant properties, which exhibit huge applications in electrical appliances and energy vehicles.
研究领域:
材料科学
·
燃烧学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMER COMPOSITES
·
2016
·Vol. 39
·期 2
·405-413
·
IF 2.004
Cui-Cui Wang,Yue-Ying Zhao,He-Yi Ge,Ru-Sheng Qian
The article reports the mechanical and thermal properties of graphene oxide (GO)/short carbon fiber (SCF)/polypropylene (PP) composite. The GO-coated SCF (GO-SCF) was prepared by a simple physical absorption method. The GO filled PP (GO-PP) was obtained by extrusion melt-mixing method. Then, GO-SCF reinforced GO-PP composite (GO-SCF/GO-PP) was prepared via the conventional extrusion compounding and injection molding techniques. The tensile, flexural and impact strengths of GO-SCF/GO-PP were obviously improved due to the chemical reaction and mechanical interlocking between the GO on SCF surface and PP. X-ray diffraction results showed the GO on SCF surface could act as a β-nucleating agent for PP crystallization. Differentials scanning calorimeter showed that GO-SCF/GO-PP had good thermal stability. Therefore, the multiscale and synergistic effects of GO-SCF/GO-PP show the extensive potential on improving mechanical and thermal performance for various fields. POLYM. COMPOS., 39:405–413, 2018. © 2016 Society of Plastics Engineers
研究领域:
材料科学
·
复合材料工程
✓ 已验证
DOI
高影响因子
POLYMER BULLETIN
·
2016
·Vol. 74
·期 4
·911-930
·
IF 1.371
Yang Jin,Lu Shaorong,Pan Lulu,Luo Qiyun,Song Laifu,Wu Lingyan,Yu Jinhong
A new green compatibilizer named epoxidized soybean oil grafted poly(12-hydroxy stearate) (ESO- g -PHS) was successfully synthesized using 12-hydroxy stearic acid and epoxidized soybean oil (ESO). The chemical structure of ESO- g -PHS was investigated through Fourier transformed infrared spectroscopy, thermogravimetric analysis, and gel permeation chromatography. ESO- g -PHS was used as a compatibilizer to enhance the interfacial compatibility between polypropylene (PP) and microcrystalline cellulose fibers (MCF). The results showed that the impact strength and tensile strength were 33.55 and 27.57 MPa when the content loading of MCF reached 10 wt% and ESO- g -PHS was 4 wt%, which enhanced by 75.4 and 30.04 %, respectively, compared to that of composites without ESO- g -PHS. In addition, the SEM images of the fracture surfaces display that PP was highly bonded to MCF with ESO- g -PHS treated. In addition, the wide angle X-ray diffraction measurement revealed that the addition of ESO- g -PHS did not change the crystal structure of PP. Moreover, there was a slight improvement in thermal properties for PP composites with the addition of ESO- g -PHS.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 34
·e52603
·
IF 3.057
Kun Chai,Zesheng Xu,Dong Chen,Yingtao Liu,Yiqun Fang,Yongming Song
Microcellular foamed wood-plastic composites (WPCs) have shown good development prospects in environmentally-friendly composites. Herein, the foamed wood flour (WF)/polypropylene (PP) composites were fabricated by mold-opening injection molding using supercritical N 2 as a physical foaming agent. The effects of nano TiO 2 on the microcellular structure and mechanical properties of WF/PP composites were investigated, and the results show that nano TiO 2 accelerates the crystallization rate and reduces the crystallinity of PP, which is beneficial to the formation of foamed homogeneous systems and cell growth in the WF/PP composites. This is mainly due to heteronucleation effect of nano TiO 2 , resulting in the refinement of crystal. Molecular chain movement of PP is limited with the introduction of nano TiO 2 , resulting in increased the melt elasticity of WF/PP composites, thereby reducing cell coalescence and collapse. With the addition of 5 wt% nano TiO 2 , the cell density was increased by 393.8%, the cell size was reduced by 54.4%, and the cell size homogeneity was clearly improved. In addition, impact strength increased by 33.3%. The improved foamability of WF/PP composites using nano TiO 2 shows a great promise for the production and application of WPC foams, especially in automotive, packaging and building areas.
研究领域:
材料科学
·
环境科学
✓ 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）