SEPARATION AND PURIFICATION TECHNOLOGY
·
2019
·
IF 5.107
Haoze Zeng,Yanbo Li,Cunwen Wang
SPEEK (sulfonated poly ether ether keton) is a type of very attractive polymeric material in membrane applications. Properties of SPEEK membranes can be tailored through controlling its sulfonation degree. However, the sulfonation degree affects the mechanical strength and membrane stability. SPEEK/PES composite membranes were prepared via a surface coating method. Those membranes show lower retentions due to the swelling of SPEEK. ZIF-8, constructed from zinc centers and 2-methlimidazole ligands, was incorporated into SPEEK to improve their performance. Sulfonation groups in SPEEK closely link to ZIF-8 through the coordination and electrostatic interactions, proved by ATR-IR characterizations and IEC measurements. The ionic crosslinked ZIF-8-SPEEK composite membranes show a higher desulfonation temperature and a lower swelling, evidenced by the TGA results and the water uptake values of ZIF-8-SPEEK composites. The crossflow filtrations show the ionic crosslinked ZIF-8-SPEEK composite membranes have good retentions of PEG1000 (70–90%), dyes (>90%) and salts (30–40%). The membrane retentions increase, whereas the permeances decrease after filling of ZIF-8. More than 100 h filtrations indicate that those membranes have a good stability. Although ZIF-8 particles are believed providing extra permeating channels, the strong ionic interactions have a domain effect on the membrane permeance.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POLYMER SCIENCE
·
2020
·Vol. 58
·期 7
·969-976
·
IF 0
Guangtao Qian,Haiquan Chen,Guangliang Song,Jianan Yao,Mengjie Hu,Chunhai Chen
To introduce intramolecular hydrogen bonds in the polyimides (PIs), 5(6)-amino-2-(5-aminopyridin-2-yl)-benzimidazole (PyPABZ) were designed and synthesized. The intramolecular interaction was indicated by Fourier transform infrared when different copolyimides were prepared with 4,4′-oxydianiline and PyPABZ. These modified poly(benzimidazole imide)s eliminate the problem of high water absorption for benzimidazole (BI)-containing PIs in the materials applications. Moreover, the high packing coefficient and rigidity of these copolyimides caused by the strong intramolecular interaction from the H-bonding and the resulting PIs exhibited outstanding thermal properties such as high glass-transition temperature ( T g ) and low coefficient of thermal expansion. Graphical The polyimides derived from 5(6)-amino-2-(5-aminopyridin-2-yl)-benzimidazole (PIs–PyPABZ) were achieved with the presence of intramolecular hydrogen bonding. These modified co-poly(benzimidazole imide)s exhibited lower H 2 O-absorption and higher thermal properties depending on the intramolecular H-bonding content.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
SURFACE REVIEW AND LETTERS
·
2022
·
IF 1.24
YULAN JIAN,HUI WAN,KAIMENG XU,YARU ZHANG,LINKUN XIE
To study the hydrophobic properties of Betula alnoides wood modified by alkyltrichlorosilanes, four alkyltrichlorosilanes with different chain lengths were used to prepare hydrolytic solutions by adding 0.25% (v/v) of alkyltrichlorosilane to anhydrous toluene, and the wood samples were immersed in the hydrolytic solutions for 4 h. The surface chemical compositions of the samples were analyzed by X-ray photoelectron spectroscopy (XPS) and Varian 640-IR Fourier Infrared Spectrometer (ATR-FTIR), the surface morphology of the samples was observed by scanning electron microscopy (SEM), and the wettability of the modified wood was investigated using an optical contact angle goniometer. The results demonstrated that treatment with alkyltrichlorosilanes introduced Si and low surface energies of –CH 2 and –CH 3 on the surface of Betula alnoides wood. The –CH 2 and –CH 3 content increased with the increase in chain length. Alkyltrichlorosilanes formed a different micro or nanoscale roughness on the surfaces of the wood samples. The water contact angles of all coatings of alkyltrichlorosilanes are greater than 1 3 1 . 3 ± 2 . 4 ∘ , and greater than 1 1 5 . 5 ± 0 . 9 ∘ after 180 s. The water absorption decreases with the increase in chain length. The water absorption of the uncoated sample is 4 4 . 0 ± 1 . 9 wt.%, while those of samples modified by MTCS and OTCS are 1 8 . 0 ± 0 . 9 wt.% and 1 1 . 0 ± 0 . 0 wt.%, respectively.
研究领域:
木材科学
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表面化学
✓ 已验证
DOI
高影响因子
POLYMER INTERNATIONAL
·
2023
·Vol. 73
·期 1
·61-67
·
IF 3.2
Siqi Zhang,Jianjun Zhang,Yue Zhang,Sude Ma
Hyperspectral imaging poses great challenges to traditional camouflage materials, primarily because there is a huge difference between the reflectance spectra of camouflage materials and natural plants in the 1400–2000 nm band. The difficulty of simulating the natural plant spectrum lies in reproducing the absorption peak of water by increasing the water content in a camouflage material. Herein, a mesoporous (MS) material is used to simulate the plant spectrum because such material can absorb and retain a large amount of water. MS was prepared via a two-step method using tetraethyl orthosilicate and tetrabutyl titanate. The characteristics of the as-prepared MS were examined via X-ray diffraction, transmission electron microscopy, ultraviolet–visible diffusion reflectance spectroscopy and nitrogen adsorption–desorption isotherms. In addition, a film was prepared using the fully absorbent mesoporous material, and the water content was determined via near-infrared spectroscopy and thermogravimetric analysis. The bonding between the mesoporous material and resin was examined via field emission gun scanning electron microscopy. The mechanical properties of the film were measured by a pendulum hardness tester and a cylindrical bending tester. The results indicate that low-temperature synthesis followed by high-temperature hydrothermal treatment is conducive to expanding the mesopore aperture, reaching a maximum of 23 nm. Moreover, the regular structure of the as-prepared titanium-containing mesoporous material is maintained under high hydrothermal temperature. The mesoporous film exhibits a good water absorption capacity of up to 80% by mass and can effectively simulate the spectrum of plants. The mechanical properties of the film are good, and the hardness of the film is related to the content of mesoporous powder. © 2023 Society of Industrial Chemistry.
研究领域:
材料科学
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光谱学
·
仿生学
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产品关联
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2020
·Vol. 31
·期 6
·1426-1436
·
IF 2.578
Zhenqian Wei,Jun Wu,Zongru Liu,Yanan Gu,Guifang Luan,Hejing Sun,Qing Yu,Sheng Zhang,Zhongwei Wang
Three commercialized flame retardants, 1,2-bis(diphenylphosphinoyl)ethane (EDPO), 6,6-(1,2-phenethyl)bis-6H-dibenz[c,e][1,2]oxaphosphorin-6,6-dioxide (HTP-6123), and hexa-phenoxy-cyclotriphosphazene (HPCTP), were used to prepare the flame retardant diglycidyl ether of bisphenol A (DGEBA) epoxy resin (EP) under the same experimental conditions. The effects of T g , thermal stability, and water absorption properties of EP caused by the three flame retardants were investigated and compared, together with their flame retardant efficiency. Results showed that the introduction of the three flame retardants improved the flame retardant performance of EP but led to decreases in T g and decomposition temperature. EDPO showed higher flame retardant efficiency than the other two flame retardants. EP/EDPO showed higher thermal stability, better flame retardant performance, higher T g value, and lower water absorption than EP/HTP-6123 and EP/HPCTP. The study discovered that EDPO and HTP-6123 primarily act through the gas phase flame retardant mechanism, while HPCTP is primarily driven by the condensed phase mechanism.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2018
·Vol. 135
·期 37
·46686
·
IF 1.901
Safdar Ali,Farooq Khurum Shehzad,Inamullah Maitlo,Sultan Valiev,Ghulam Muhyodin,Jun Nie
Two types of cryogels were obtained using 2-hydroxyethyl acrylate (HEA) and 2-hydroxyethyl methacrylate (HEMA) by homogeneous mixing with poly(ethylene glycol) diacrylate (PEGDA) as crosslinker at subzero temperature followed by photopolymerization with two different light initiation sources (high-pressure Hg arc lamp and UV-LED).The solution was frozen unidirectionally at −60 °C before polymerization and finally photopolymerized at the same temperature. The cryogels were characterized using photo-DSC, UV–vis and Fourier transform infrared spectroscopy, and scanning electron microscopy techniques. The cryogels cured with an LED light showed a higher polymerization rate and better morphological characteristics than ones cured with a high-pressure Hg arc. The water intake ratio of HEA/PEGDA was higher than HEMA/PEGDA for both curing sources. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 46686.
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
POLYMER
·
2017
·
IF 3.684
Yanli Ma,Ling Lv,Yuanru Guo,Yujie Fu,Qian Shao,Tingting Wu,Sijie Guo,Kai Sun,Xingkui Guo,Evan K. Wujcik,Zhanhu Guo
Lignin grafted N, N′-methylene-bisacrylamide (LM) was copolymerized with acrylic acid (AA) to fabricate lignin based poly (acrylic acid) (LBPAA) nanocomposites, and organo-montmorillonite (OrgMMT) was uniformly dispersed in LBPAA by ultrasonic method. The water absorbency in KCl solution was 302.9 g/g for LBPAA/OrgMMT (3 wt% OrgMMT, 43.65 wt% LM, and 53.35 wt% poly(acrylic acid) (PAA)), higher than PAA/OrgMMT (104.5736 g/g), and PAA (131.8 g/g). The Pb 2+ adsorption for LBPAA/OrgMMT was demonstrated to be pH-dependent and followed Freundlich multilayer adsorption , with the removal following a pseudo-second-order kinetic model . The Pb 2+ absorption capacity of LBPAA (PAA 48.50/48.50 LM)/OrgMMT (3 wt%) was 1.0803 mmol·g −1 , the highest among the composites. When the mole ratio of Na + and Pb 2+ was less than 0.21, the Pb 2+ adsorption capacity of LBPAA/OrgMMT decreased slightly. The negative ΔG 0 indicated that the Pb 2+ adsorption process for composite hydrogel and PAA was spontaneous. XPS analysis data indicated that Pb 2+ ions formed Pb-O bonds by hydroxyl groups and carboxyl groups for efficient lead ion adsorption. This study demonstrates that LBPAA/OrgMMT can be used as a water retention agent with salt tolerance and as an adsorbent for removing Pb 2+ ions from industrial waste water .
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2021
·
IF 4.598
Zhengkai Wei,Zhimeng Liu,Xiaowei Fu,Yuechuan Wang,Anqian Yuan,Jingxin Lei
A series of solvent-free waterborne polyurethanes (WPUs) with different soft segment structure were prepared by respectively using different number-average molecular weight ( M n ) of polytetramethylene glycol (PTMG, M n = 1000, 2000, 3000) and poly (1,4-butylene adipate) (PBA, M n = 1000, 2000 3000) as main diol in this paper. Effect of soft segment crystallization on water resistance of WPUs was discussed. The crystallization properties of WPU films were investigated by differential scanning calorimetry (DSC) and X-ray diffraction (XRD). The water resistance was determined by water absorption ratio. DSC and XRD results confirm that there are no crystalline structures in the WPU films which are synthesized with PTMG ( M n = 1000, 2000, 3000) and PBA ( M n = 1000), while the WPU films synthesized with PBA ( M n = 2000 and 3000) have obvious crystalline structures at room temperature. Meanwhile, the WPU films synthesized with PBA ( M n = 2000 and 3000) possess excellent water resistance because the existence of crystalline structure.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2025
·
IF 2.8
Zhihua Li,Ziyi Wang,Yidan Zhang,Ziteng Guo,Bo Zhao,Sainan Liu
Polyurethane elastomers are widely employed as underwater transducer encapsulants, owing to their distinctive mechanical and acoustic properties. However, the lack of hydrophobicity of polyurethanes remains a problem to be resolved. A series of hydrophobic fluorine-modified polyurethanes (FPUs) were synthesized by incorporating 1H,1H,2H,2H-perfluorodecyltriMethoxysilane (FAS-17) into polybutadiene-based polyurethane. These fluorinated chain extenders enhance the hydrophobicity by reducing surface energy and increase physical cross-linking points, thereby improving the material's overall performance. Remarkably, at a FAS-17 content of 4 wt%, the water contact angle of FPU-2 rises to 106.0°, with a water absorption rate of only 0.189%. This corresponds to a substantial 58.6% reduction in water absorption compared to unmodified polyurethane (PU), demonstrating its exceptional hydrophobicity. Additionally, the introduction of fluorine-containing chains enhances mechanical properties, with FPU-2 having an elongation at break (452%) and tensile strength (10.93 MPa). These results demonstrate that fluorinated polyurethane not only retains the essential properties for underwater sound transmission but also significantly improves hydrophobicity.
研究领域:
材料科学
·
声学工程
✓ 已验证
产品关联
DOI
高影响因子
Reaction Chemistry & Engineering
·
2024
·Vol. 10
·期 1
·203-213
·
IF 3.4
Ning Ma,Liu Yang,Zhenchang Fang,Kaijia Jiang,Xinling Li,Zhen Huang
Deficiencies such as high viscosity, volatility, and rich phase precipitation limited the engineering application of non-aqueous absorbents. A series of high boiling point solvent screening experiments were conducted to develop an absorption saturated solution with a homogeneous phase at low viscosity (14.71 mPa s) in this study. Further addition of polyamines increased the absorption capacity by 42% (3.55 mol CO2 per kg). The 13C NMR results indicated that in the DETA/MEA/NMF blended amine system, MEA was involved in the deprotonation process of DETA zwitterions as proton acceptors. Quantum chemical calculations were utilized to compare the energies of each possible single-step reaction, providing insights into the reaction pathways of the blended amine system. The rate constant of the MEA/CO2 reaction was found to be 1.98 times that of the DETA/CO2 reaction, indicating lower reaction activity, consistent with NMR results. In addition, the results of the analysis of weak interactions revealed that the hydrogen bonds were key factors affecting the viscosity change and precipitation in non-aqueous absorbents, providing a new method for designing novel low-viscosity non-aqueous absorbents. The combination of theoretical analysis and experimental results underscores the potential of the blended amine non-aqueous absorbent as a feasible alternative for the industrial applications of CO2 capture.
研究领域:
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF PHYSICAL CHEMISTRY B
·
2024
·
IF 2.8
Hong-Jie Zhang,Xue-Bin Shang,Xu-Ran Wang,Chen-Xi Zhang,Qing-Lun Wang
SCPEEK@MOF proton exchange membranes, where SCPEEK is sulfinyl chloride polyether ether ketone and MOF is a metal–organic framework, were prepared by doping Fe-MIL-101-NH2 into polymers. The amino group in the MOF and the -SOCl2 group in thionyl chloride polyether ether ketone cross-link to form a covalent bond through the Hinsberg reaction, and the prepared composite membrane has stronger stability than other electrostatic interactions and simple physical doping composite membranes. The formation of covalent bonds improves the water absorption of the composite membrane, which makes it easy for water molecules to form hydrogen bonds. Moreover, SPEEK as a proton conductive polymer and the synergy of MOFs improve the proton conductivity of composite membranes. The composite membranes were characterized by Fourier transform infrared spectroscopy, powder X-ray diffraction, scanning electron microscopy, and atomic force microscopy. The swelling rate, water absorption, mechanical stability, ion exchange capacity, and proton conductivity of the pure sulfonated polyether ether ketone (SPEEK) membrane were compared with those of the mechanically doped SPEEK/MOF membrane and the composite membrane SCPEEK@MOF doped with different ratios of Fe-MIL-101-NH2, and all of the SCPEEK@MOF showed superior performance. When the Fe-MIL-101-NH2 loading rate of the composite membrane is 2%, the proton conductivity of the composite membrane can reach 0.202 S cm–1 at 363 K and a 98% relative humidity, which is much higher than that of the SPEEK/MOF membrane obtained by simple physical doping under the same conditions.
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
Nature Communications
·
2024
·Vol. 15
·期 1
·1-12
·
IF 14.7
Zhang Yuanchi,Li Cairong,Guo Along,Yang Yipei,Nie Yangyi,Liao Jiaxin,Liu Ben,Zhou Yanmei,Li Long,Chen Zhitong,Zhang Wei,Qin Ling,Lai Yuxiao
Wet-tissue adhesives have long been attractive materials for realizing complicated biomedical functions. However, the hydration film on wet tissues can generate a boundary, forming hydrogen bonds with the adhesives that weaken adhesive strength. Introducing black phosphorus (BP) is believed to enhance the water absorption capacity of tape-type adhesives and effectively eliminate hydration layers between the tissue and adhesive. This study reports a composite patch integrated with BP nanosheets (CPB) for wet-tissue adhesion. The patch’s improved water absorption and mechanical properties ensure its immediate and robust adhesion to wet tissues. Various bioapplications of CPB are demonstrated, such as rapid hemostasis (within ~1-2 seconds), monitoring of physical-activity and prevention of tumour-recurrence, all validated via in vivo studies. Given the good practicability, histocompatibility and biodegradability of CPB, the proposed patches hold significant promise for a wide range of biomedical applications.
研究领域:
生物医学工程
·
材料科学
✓ 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）