Journal of Coatings Technology and Research
·
2024
·Vol. 21
·期 3
·879-892
·
IF 2.3
Kuang Guankun,Liu Yan,Qin Ying,Lu Tianhao,Xin Binjie
Acrylic acid is commonly used to modify anionic waterborne polyurethanes, and little research has been done on the modification of cationic waterborne polyurethanes. In this study, the effect of acrylic acid addition at different levels on the performance of cationic waterborne polyurethanes was investigated. The experimental results showed that the stability, and chemical resistance of cationic waterborne polyurethane coatings were improved with the addition of acrylic acid, which has the advantages of better chemical resistance, high stability and low price, and the hardness of the coating gradually increased and the adhesion decreased with the increase of acrylic acid content, therefore, the acrylic acid content of 21% was the most suitable. In addition, the effect of amino acids as neutralizing agents on the performance of cationic waterborne polyurethane coatings was also explored. The addition of amino acids helped the cationic waterborne polyurethane to form a reticular crosslinked structure, and the experimental results showed that the mechanical properties of the cationic waterborne polyurethane coatings were greatly improved. Compared with the commonly used acids (hydrochloric acid and acetic acid), amino acids have the advantage of being environmentally friendly and non-toxic, which is more conducive to the industrial production and application of cationic waterborne polyurethane coatings.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Xinyu Ma,Aiqi Wang,Jinlei Miao,Tingting Fan
Efficient wastewater treatment under harsh conditions remains a great challenge, while traditional filtration membranes are inefficient to meet the demands due to its poor chemical resistance as well as the “trade-off” effect between high permeability and selectivity. Herein, a chemical-resistant 2D lamellar membrane simultaneously with high flux and rejection for harsh environmental wastewater treatment was proposed, via assembled small sized graphene oxide nanosheets (NGO) layer-by-layer on polyphenylene sulfide (PPS) while hetero-intercalated with MXene. As the performance of 2D laminated membranes is determined by the length/tortuosity of transport channels and interlayer spacing between the flakes, NGO nanosheets were sonicated into small sizes (<500 nm) and intercalated with MXene to engineer shorter/less tortuous transport pathways while tuning the interlayer spacing for fast and selective separation. The membranes exhibit remarkably high-water permeability (up to 136.68 L·m −2 ·h −1 ·bar −1 ) while simultaneously with excellent retention (>99.99 %) for various dyes (molecular weight 288.77–1017.65) at the NGO/MXene ratio of 1/7, which is much higher than most reported membranes. Meanwhile, the Ti-O-C covalent bonding between NGO and MXene nanosheets also enables stable ultrafast water transmission and anti-swelling stability. The PPS-NGO/MXene membranes could still exhibit excellent separation performance even under various harsh environments (strong acids, bases, high pressures, high temperatures, bacteria, organic solvents), which holds great promise for sustainable wastewater treatment under harsh conditions.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF POLYMER SCIENCE
·
2017
·Vol. 36
·期 1
·85-97
·
IF 1.692
Li Ning,Zeng Fang-Lei,Wang Yu,Qu De-Zhi,Zhang Chun,Li Juan,Huo Jin-Zhao,Bai Yong-Ping
In this study, two fluorinated polyurethanes (FPU) containing carborane groups in the main chains were firstly designed and synthesized via the reaction of hexamethylene diisocyanate trimer (HDI trimer) with fluorinated polyesters (CFPETs) having hydroxyl-terminated carborane groups at room temperature. The structures of carborane fluorinated polyesters (CFPETs) and polyurethanes (CFPUs) were characterized by gel permeation chromatography (GPC), Fourier transform infrared (FTIR) spectroscopy and nuclear magnetic resonance (NMR) measurements. The thermal stability, mechanical properties, Shore A hardness, solvent resistance and acid-alkali resistance of the carborane fluorinated polyurethane films were also studied. Thermogravimetric analysis (TGA) tests manifested that the introduction of carborane groups into the main chain of fluorinated polyurethane endowed the obtained fluorinated polyurethane with excellent thermal stability. The thermal decomposition temperature of carborane fluorinated polyurethane (CFPU) increased by 190 °C compared with that of the carborane-free fluorinated polyurethane (FPU). Even at 800 °C, CFPU showed the char yield of 66.5%, which was higher than that of FPU (34.3%). The carborane-containing fluorinated polyurethanes also showed excellent chemical resistance and prominent mechanical property even after the cured films being immersed into Jet aircraft oil or 37% HCl for 168 h or at high temperature (700 °C). It is found that the structural characteristics of carborane group and the compacted structure of CFPU effectively improve the thermal stability, mechanical property, solvent resistance and acid-alkali resistance of the carborane-free fluorinated polyurethane. These excellent properties make CFPU as the useful raw materials to prepare the high temperature resistant coatings or adhesives for automotive engines, engine or fuel tank of aircraft and other equipment working in high-temperature or high concentrations of acid-alkali environments.
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
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Xue Yang,Yi Pu,Shuxia Li,Xiaofang Liu,Zheshan Wang,Ding Yuan,Xin Ning
To address the challenge of high-temperature air filtration, a novel electreted polysulfonamide/polyacrylonitrile-boehmite (PSA/PAN-B) composite nanofiber based filter was developed via electrospinning for effective high-temperature dust removal. In this study, the spinnability of PSA was greatly improved by adding a small amount of PAN as an auxiliary polymer, and the introduction of a boehmite electret further significantly reinforced the properties of PSA fibers. As a result, the PSA/PAN-B membrane exhibited a high filtration efficiency (up to 99.52 ± 0.32%), low pressure drop (45.16 ± 1.39 Pa), excellent flexibility, good mechanical properties, high thermal stability (up to approximately 300 °C), and superior chemical resistance. Through data analysis and 3D simulation, the important benefits of the boehmite electret in the optimization of the PSA fibrous membrane performance were determined: it increases the charge storage capacity, constructs a rough surface morphology, improves the specific surface area, and enhances the mechanical properties. More importantly, the PSA/PAN-B film possessed a robust PM2.5 purification capacity, and the particulate matter removal efficiency was kept unchanged after high-temperature, acid, or alkali treatment—a performance derived from the intrinsic molecular structure of PSA. The PSA/PAN-B composite fibrous membrane, with excellent comprehensive properties, is a promising candidate for air filters, especially in harsh environments, further broadening the applications of PSA and providing new insight into the design of high-performance filters with high-temperature and corrosion resistance.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2021
·Vol. 56
·期 18
·11174-11185
·
IF 4.22
Cong Xin,Ren Jiannan,Xiang Chunhui,Gai Xuzhao,Wang Guibin,Yang Yanchao,Wang Shengdao,Zhang Jiacheng,Luan Jiashuang,Yu Zhenxiang
It remains a challenge to prepare special engineering paper with excellent mechanical properties, high temperature resistance and chemical resistance. The emergence of high-performance fiber provides support for the technical progress of special engineering paper. Herein, a novel method to obtain a novel self-reinforced poly (ether ether ketone) (PEEK) composite paper (SR-DI-PEEK/paper) by vacuum filtration, impregnation and hot pressing. Specially, PEEK fibers were used as the skeleton fiber and a small amount of aramid pulp was added as the decanted fiber. By optimizing the process of SR-DI-PEEK/paper preparation, the best mechanical properties of SR-DI-PEEK/paper was presented. Compared with the composite paper prepared with Phenolic solution (PF-PEEK/paper) and Polyimide solution (PI-PEEK/paper), the mechanical properties of SR-DI-PEEK/paper was significantly improved. In particular, when the concentration of impregnation was 3 wt%, the tensile index of SR-DI-PEEK/paper reached 51.10 N m g −1 (tensile strength 47.16 kN m −1 ), which is 16.48 times than that of the un-impregnated PEEK/paper (2.86 kN m −1 ). SR-DI-PEEK/paper also exhibited excellent chemical resistance among acid, alkali, and polar solvents, while the tensile index maintained 96.3% after 40 wt% H 2 SO 4 treatment. Besides, SR-DI-PEEK/paper showed superior thermal performance, while the temperatures corresponding to the weight loss of 5% were 574 °C. Graphical abstract
研究领域:
材料科学
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工程学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Pengfei Li,Xu Ma,Guifen Gong,Caihong Xu,Zongbo Zhang
AgNW networks show high promise as a conductive material due to excellent flexibility, low resistance, high transparency, and ease of large-scale preparation. However, the application of AgNW networks has been hindered by their inherent characteristics, such as easy oxidation degradation, chemical corrosion, and structural instability at high temperatures. In this study, a dense SiOx protective layer derived from perhydropolysilazane was introduced to fabricate a robust SiOx/AgNW nanocomposite coating through an all-solution process at room temperature. The achieved nanocomposite coating shows outstanding thermal stability up to 450 °C, resistance to ultraviolet radiation, and excellent mechanical performance by maintaining stability after 10,000 cycles of bending at a radius of 2.5 mm, 1000 cycles of peeling, and 1200 cycles of wearing. Meanwhile, the nanocomposite coating demonstrates exceptional chemical tolerance against HCl, Na2S, and organic solvents. A transparent heater based on the nanocomposite coating achieves a remarkable benchmark with a maximum temperature of 400 °C at 20 V. These features highlight the potential of the nanocomposite coating in flexible electronics, optoelectronics, touch screens, and high-performance heaters.
研究领域:
材料科学
·
纳米技术
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电子工程
✓ 已验证
DOI
PubMed
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2024
·
IF 7.4
Huajun Sun,Kangbo Yang,Nan Xiang,Guifeng Tang,Na Zhang,Chuanxing Wang
This study presented the synthesis and characterization of polyester block polyamide hot melt adhesives (PPHMAs) with high adhesion strength and toughness. The PPHMAs demonstrated an adhesion strength of 11.04 MPa and toughness of 22.54 MJ·m −3 , making them suitable for various substrates such as aluminum , copper, and stainless steel. The polyamide segments synthesized from dimer acid and 2-methyl-1,5-diaminopentane exhibited characteristics of softness and high elongation. Using isophorone diamine as a reinforcing agent introduced a stable six-membered ring structure, which enhanced the polymer's rigidity and strength, thus meeting the requirements for polyamide segments to function as the hard segments in block polymers . A trace amount of Tris (2-aminoethyl) amine provided the cross-linking sites which are similar to those in neuronal structures. The polyester segments, which were synthesized from poly (propylene glycol) diglycidyl ether and sebacic acid, served as the soft segments in the block polymer and were connected to the hard segment via amide bonds. The addition of the polyester segments enhanced the non-covalent molecular interactions within PPHMAs, leading to dynamic crosslinking properties. The adhesive maintained stable adhesion even after six cycles, which showcased its durability. Furthermore, the PPHMAs exhibited notable chemical resistance. It retained over 60 % adhesion strength after exposure to some chemical solvents including artificial seawater , 5 % NaOH solution, 5 % HCl solution, and DMSO for 24 h. These findings offered a novel approach to enhancing the adhesion strength and toughness of conventional thermoplastic hot melt adhesives.
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
Polymers
·
2024
·Vol. 16
·期 8
·1154
·
IF 4.7
Mingpeng Hou,Qiuying Li,Yanchao Che
Polytetrafluoroethylene (PTFE) capillary membranes, known for the great chemical resistance and thermal stability, are commonly used in membrane separation technologies. However, the strong hydrophobic property of PTFE limits its application in water filtration. This study introduces a method whereby acrylamide (AM), N, N-methylene bisacrylamide (MBA), and vinyltriethoxysilane (VTES) undergo free radical copolymerization, followed by the hydrolysis-condensation of silane bonds, resulting in the formation of hydrophilic three-dimensional networks physically intertwined with the PTFE capillary membranes. The modified PTFE capillary membranes prepared through this method exhibit excellent hydrophilic properties, whose water contact angles are decreased by 24.3–61.2%, and increasing pure water flux from 0 to 1732.7–2666.0 L/m2·h. The enhancement in hydrophilicity of the modified PTFE capillary membranes is attributed to the introduction of hydrophilic groups such as amide bonds and siloxane bonds, along with an increase in surface roughness. Moreover, the modified PTFE capillary membranes exhibit chemical resistance, maintaining the hydrophilicity even after immersion in strong acidic (3 wt% HCl), alkaline (3 wt% NaOH), and oxidative (3 wt% NaClO) solutions for 2 weeks. In conclusion, this promising method yields modified PTFE capillary membranes with great hydrophilicity and chemical resistance, presenting substantial potential for applications in the field of water filtration.
研究领域:
材料科学
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环境工程
·
膜技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials Today Communications
·
2024
·
IF 3.7
Tingting Zhang,Ning Xu,Wang Yin,Dongli Liu,Chang Liu,Meidong Lang
Polydicyclopentadiene (PDCPD) was attractive in marine, automotive and new energy fields, but limited by its lower rigidity . Herein, poly(dicyclopentadiene- co -tricyclopentadiene) (poly(DCPD- co -TCPD)), was prepared by rapid and energy-efficient frontal polymerization (FP). The flexural properties of copolymers prepared via FP were comparable to those prepared by long-term oven curing. Furthermore, the study explored the cis-trans isomerization of double bond , molecular weight between cross-links, density, swelling degree and monomer conversion to systematically analyze the influence of tricyclopentadiene (TCPD) incorporation. Notably, the selected comonomer TCPD was relatively simple in synthesis, and its incorporation resulted in remarkable enhancement of the thermomechanical properties and acid-base resistance of neat PDCPD. At an 80 wt% TCPD incorporation, the flexural modulus increased significantly from 1865 MPa to 2703 MPa, and the T g elevated from 147 ℃ to 210 ℃. Compared to other widely used thermosets , poly(DCPD- co -TCPD) exhibited significant advantages in terms of being lightweight and heat-resistant. The resulting thermosets demonstrated considerable potential for applications as high-performance thermosets and in composites with adjustable thermomechanical properties .
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
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Lei Zhang,Chunlei Gao,Lieshuang Zhong,Lingmei Zhu,Huan Chen,Yongping Hou,Yongmei Zheng
We present a robustly durably corrosive superhydrophobic coating with photothermal effect (DCSCPE) for anti-icing/de-icing performance that can be designed by using as-synthetized Fe 3 O 4 composite nanoparticles (NPs), along with protective coat (polydimethylsiloxane) and bonding basecoat (epoxy). In this design, the Fe 3 O 4 nanoparticles (NPs) are optimized in dual-size: 200 /20 nm and weight ratio:1/2 to achieve both micro/nanostructures and superior photothermal conversion properties (up to 14.4 °C/min) and light-to-heat conversion efficiency (62.38%), which is superior to other DCSCPE coatings. As a result, the DCSCPE 1/2 takes on excellent superhydrophobicity under corrosion for 20 days by pH ∼ 1–14 and efficient de-icing performance, i.e., the ice-covering is melted in short time of 790 s under sunlight illumination and the DCSCPE 1/2 surfaces show a high deicing rate (∼1.96 kg m −2 h −1 ), which is benefited from synergy effect that is resulted from the excellent micro/nanostructures and the high-efficiently photothermal ability of as-synthetized Fe 3 O 4 composite NPs. The stability on chemical and mechanical interface of micro/ nanostructures can be further demonstrated to greatly favor the robust anti-icing/de-icing performance for a long term. This studying is considerably significant to design the novel protective materials on anti-icing, anti-corrosion that can be extended into practical applications.
研究领域:
材料科学
·
表面工程
·
能源转换材料
✓ 已验证
DOI
高影响因子
Materials Research Express
·
2019
·Vol. 6
·期 5
·055321
·
IF 1.449
Ruo-Can Liu,Ke Liu,Yong Du,Xiao-Wei Xu,Run-Ping Jia
The thermoplastic polyurethane/Nd2O3 (TPU/Nd2O3) nanocomposites with different content of Nd2O3 nanoparticles are synthesized via an in situ bulk polymerization technique. The results of x-ray Diffraction and Scanning Electron Microscopy show that Nd2O3 nanoparticles with size of 40 nm are uniformly dispersed in TPU matrix. Furthermore, the degrees of microphase separation of the nanocomposites are evaluated by Fourier Transform Infrared Spectroscopy and Dynamic Mechanical Analysis, and the effect of different Nd2O3 nanoparticle contents on the properties of TPU/Nd2O3 nanocomposites is investigated. When the content of Nd2O3 nanoparticles is 0.5 wt%, the nanocomposites has the highest degree of microphase separation, and the corresponding melting temperature, decomposition temperature, tensile strength, and elongation at break of TPU/Nd2O3 nanocomposites reach their maximum values of 196.5 °C, 352.7 °C, 53.9 MPa, and 703%, which are higher by 17.9%, 13.5%, 89.1% and 32.4% than pure TPU, respectively. Meanwhile, the TPU/Nd2O3 nanocomposites also illustrate better chemical resistance characteristics compared with pure TPU. Finally, the interaction mechanism between Nd2O3 and TPU is investigated by x-ray Photoelectron Spectroscopy, which confirms that the coordination bonds between Nd2O3 and carbamate groups of TPU are existed in the nanocomposites.
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
CARBOHYDRATE POLYMERS
·
2018
·
IF 5.158
Rui Hu,Bingxue Huang,Zhouhang Xue,Qingye Li,Tian Xia,Wei Zhang,Canhui Lu,Huagang Xu
Three-dimensional (3D) printing parts with excellent resolution and high performance are of great significance for scientific and engineering applications. In this study, a novel photocurable cellulose acetate butyrate (PC-CAB) resin was synthesized for continuous liquid interface production (CLIP) to construct 3D objects with high resolution, tailored mechanical properties, excellent chemical resistance and thermal stability. Particularly, the tensile and flexural strength of the CLIP 3D printed specimen could reach 44.67 and 64.53 MPa, respectively. Their solvent resistance against various organic solvents and strong acidic/basic solutions was evaluated. As expected, the 3D prints could well maintain their structural integrity and exhibited very low swelling ratios owing to the photo-induced chemical crosslinking structure. Notably, even after immersion in methylene chloride or 1.0 M acid/alkali for 3 h, the 3D prints still showed excellent mechanical and thermal properties. Further study demonstrated that when PC-CAB in the CLIP ink was optimized to 20 wt% while the photoinitiator (PI) was 0.5 wt%, complex-structured 3D printed objects with high surface quality could be obtained under specific printing parameters.
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
危险品化学品经营许可证（带存储）