Coatings
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2022
·Vol. 12
·期 9
·1234
·
IF 3.236
Ting Xu,Wenxiang Zhu,Jian Sun
Superabsorbent polymers (SAPs) can absorb a large amount of water and find broad applications in various industries. There are many reports on the synthesis and structural modification techniques to improve the water absorption property of SAPs. However, we see few studies on the comparison and integration of these techniques. In this study, three structurally modified SAPs were synthesized and are evaluated for the effects of surface cross-linking, foaming, and the integration of the two modifications to improve the absorption rate and capacity of a conventional SAP. First, sodium polyacrylate-polyacrylamide was prepared as the base polymer by the aqueous solution polymerization method. Second, the base polymer was modified with surface cross-linking to enhance absorption, and a surface cross-linked SAP was obtained. Third, the base polymer was modified with foaming to obtain a foamed SAP. Lastly, the foamed SAP was modified further with surface cross-linking to obtain a foamed and surface cross-linked SAP. In comparison with the base polymer, the three synthesized SAPs were evaluated for their absorption performance. Results show that their absorption performance could be improved by the three modification processes. Specifically, the surface cross-linked SAP had the best absorption capacity under load, the foamed SAP had the highest absorption capacity of 1954 g/g, and the foamed and surface cross-linked SAP had the fastest absorption rate with an initial swelling rate of Kis= 21.94.Keywords:acrylamide;surface cross-linking;foaming;water absorption capacity;water absorption rate
研究领域:
材料科学
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化学工程
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高分子化学
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产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2023
·Vol. 140
·期 36
·e54362
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IF 3
Xiaosai Hu,Chenyang Wang,Haiyang Yu
Superabsorbent polymers (SAPs) are attracting more research interests in many fields mainly due to its distinguished water-absorbing performance. Among all the factors that severely affecting water absorption of SAPs, cross-linkers play a non-negligible role in shaping the stable cross-linked networks of SAPs. As for cross-linking agents, previous studies have focused on the chemical cross-linker as well as functional nanoparticle cross-linker. Though their corresponding SAPs can achieve high water uptake capacity, the sustainable development of such SAPs was still limited by the natural defects of these cross-linkers. Herein, we reported small-molecule sodium tungstate (STD) as one novel cross-linker to optimize water-holding capabilities of SAPs. STD shows a high affinity to polymeric chains mainly via multiple hydrogen bonding interactions. The resultant poly(acrylic acid)/STD SAP exhibited a satisfactory water-absorbing capacities with swelling ratios of 7527 g/g in distilled water, 95 g/g in 0.9 wt% NaCl solution and 2210 g/g in 3 wt% urea solution, respectively. In addition, such high water absorbency was achieved within SAP system just made up of a sole polymer and a sole cross-linker, implying that STD can be used as novel cross-linker to promote the green development of SAPs.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
JOURNAL OF COMPOSITE MATERIALS
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2015
·
IF 1.173
Guofu Ma,Feitian Ran,Enke Feng,Zhe Zhang,Ziqiang Lei
A novel, low-cost, and eco-friendly organic–inorganic composite superabsorbent is successfully prepared in aqueous solution by graft copolymerization of partially neutralized acrylic acid (AA), polyvinyl alcohol (PVA), and attapulgite (APT) using ammonium persulfate (APS) as an initiator and N,N-methylenebisacrylamide (MBA) as a crosslinker. The structure and morphology of the composite superabsorbent are characterized by means of Fourier transform infrared, X-ray diffraction, field-emission scanning electron microscopy, and transmission electron microscopy. The effects of APT content which can affect the water absorbency and the pH, ionic surfactants and different saline solution which can affect swelling capabilities of the composite superabsorbent are also investigated. The results show the composite superabsorbent give the best absorption up to 680 g/g and 53 g/g in distilled water and 0.9 wt% NaCl solution, high water absorbency over a wide pH range of 4–10, high swelling capacity in anionic surfactant than that of cationic solution, which makes it promising for potential applications in modern agriculture and horticulture. On the other hand, the composite superabsorbent can be used for removing multivalent metal ions.
研究领域:
材料科学
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环境科学
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农业科学
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DOI
高影响因子
Materials Today Communications
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2018
·
IF 0
Xianglin Yu,Zhe Wang,Jiajun Liu,Hua Mei,Dingli Yong,Junbo Li
A sodium humated (SH) modified superabsorbent resin (SAR), which had good water absorbency and slow-release fertilizer properties has been successfully prepared by inverse suspension polymerization. The structure and morphology of the as-prepared SAR was characterized by Fourier Transform Infrared Spectroscopy (FTIR), Optical Microscope (OM) and Thermogravimetric Analysis (TGA). The effect of initiator content, crosslinker content, oil-water ratio and temperature on the water absorbency of the SAR was investigated. Under optimum conditions, the water absorbency reached 1097 g/g and 103 g/g in deionized water and 0.9 wt% NaCl solution, respectively. The moisture resistance capacity of SAR with SH increased to 2%. What’s more, the SH modified SAR also had better water absorbency in different cation solutions. The slow-release test showed a two-stage release characteristic of SAR that fast rate in first 12 days (carbon content reached 0.218 mg / 5 ml) and slow rate from 12 to 30 days (carbon content reached 0.242 mg / 5 ml). The degradation performance test showed that degradation rate of the SAR in soil could reach 31.9% after 100 days.
研究领域:
材料科学
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农业科学
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DOI
Materials Today Sustainability
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2024
·
IF 7.1
Yan Liu,Yongfeng Zhu,Fangzhi Duan,Bin Mu,Xicun Wang,Aiqin Wang
It is crucial to design the novel low-cost and salt-tolerant superabsorbent for safeguarding food security and achieving sustainable agriculture. Herein, the porous superabsorbent composites with excellent salt tolerance were fabricated by redox-initiated grafting polymerization using water-based Pickering foam template co-stabilized with solid waste of coal gasification slag and plant particles Sapindus mukorossi pericarp . The stabilization mechanism of Pickering foams, swelling performance and salt-resistance of porous superabsorbent composites were studied in detail. Due to the abundant porous structure and the presence of coal gasification slag, the obtained superabsorbent composites exhibited rapid swelling rate and excellent water absorption capability, and the maximum water absorption in distilled water and 0.9 wt% NaCl solution reached 910 g/g and 126 g/g after 30 min, respectively. As 1.5 wt% the optimal superabsorbent composites was added into the saline-alkali soil, the growth of cabbages was significantly improved, and the plant height and chlorophyll content increased by 45.0% and 12.5%, respectively. This work served as a significant reference for preparing novel environmentally friendly water-saving materials for arid saline-alkali soil improvement.
研究领域:
农业科学
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环境科学
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材料科学
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产品关联
DOI
高影响因子
Advanced Sustainable Systems
·
2023
·Vol. 8
·期 2
·2300331
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IF 7.1
Cailing Yang,Wenxu Zhang,Rongnian Xu,Huaiwu Peng,Zhenshi Zhang,Xiaomei Liu,Li Li,Tingli Li,Jing Li,Pengbo Liu,Xinlu Jin,Yuanyuan Ma,Ziqiang Lei
Modified MIL-101(Al)-NH 2 (MIL-101(Al)-NH 2 -net) is used as a crosslinking agent and acrylic acid (AA) as a monomer, the MIL-101(Al)-NH 2 -net grafted polyacrylic acid (MIL-101(Al)-NH 2 -net-g-PAA (MAP)) composite water-absorbent material is synthesized using the free radical polymerization method to study the application of composite absorbent materials in water collection. The structure and morphology of the composite water-absorbent material are characterized using Fourier transform infrared spectrometry (FTIR), scanning electron microscope (SEM), transmission electron microscope (TEM), Brunauer Emmett Teller (BET), and thermogravimetric analysis (TG), and the contents of ammonium persulfate (APS), MIL-101(Al)-NH 2 -net, and neutralization degree of AA are optimized. Under optimal conditions, the water absorption ratios of the composite materials in distilled water, tap water, and 0.9% NaCl solution are 744, 169.5, and 85.5 g g −1 . In addition, the properties of collecting water vapor are investigated. At 25 °C, 50% Relative Humidity (RH), 70% RH, and 90% RH, the MAP water vapor adsorption capacity is 0.0312, 0.5760, and 1.6856 g g −1 , respectively. The water vapor adsorption of MIL-101(Al)-NH 2 and MIL-101(Al)-NH 2 self-polymerization products are 0.025 and 0.1278 g g −1 , respectively. The result showed that autopolymerization can improve the water vapor adsorption performance.
研究领域:
材料科学
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化学工程
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环境科学
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DOI
高影响因子
LANGMUIR
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2021
·
IF 3.882
Peng Wang,Wenxu Zhang,Liang Wang,Suoting Fan,Yun Deng,Qian Liang,Bowen Chen
A superabsorbent polymer (SAP) was synthesized by solution polymerization. The influence of synthesis technology was studied and optimized, and FTIR, SEM, and TGA were used to characterize the structure and morphology of the material. Under the optimal synthesis conditions, the water absorption of the material can achieve about 80% of the saturation value in the first 20 min, and the material absorbs distilled water up to 2013 g/g. The SAP also has remarkable water retention and reswelling capability. The excellent performance makes it have a promising application in agriculture. In addition, the results show that the dosage of the reaction medium is a major factor for performance. Under the condition of the optimum value of other factors, the influence of the dosage of the reaction medium on water absorption can reach about 1000 g in distilled water.
研究领域:
材料科学
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农业科学
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DOI
高影响因子
ENERGY
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2015
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IF 4.844
Zhihao Pan,C.Y. Zhao
Thermal energy storage systems improve the inefficiency of industrial processes and renewable energy systems (supply versus demand). Chemical reaction is a promising way to store thermal energy because of its high energy storage density , long-term energy storage, etc. This study investigated an MgO/H 2 O chemical thermal storage system that stores thermal energy by decomposing Mg(OH) 2 (endothermic reaction), and supplies thermal energy by combining water vapor with MgO (exothermic reaction). Heat supply is greatly influenced by MgO properties, particularly dehydration temperature. Therefore, the equilibrium hydration fractions of MgO prepared at various dehydration temperatures were measured. Then, the relation between dehydration temperature and the equilibrium hydration fractions of MgO was determined. The equilibrium hydration fractions of MgO at various hydration temperatures and pressures were also measured. The chemical thermal storage system was inefficient at dehydration temperatures lower than 350 °C or higher than 500 °C. The efficiency of this system can be improved by increasing the hydration temperature while keeping the relative vapor pressure unchanged.
研究领域:
能源科学
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材料科学
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产品关联
DOI
高影响因子
FIBERS AND POLYMERS
·
2014
·Vol. 15
·期 1
·145-152
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IF 1.113
Liu Hongyi,Zhang Yong,Yao Juming
Recently, cellulose-based superabsorbent has attracted attention as a promising material in many fields because of its rich sources and outstanding properties of biodegradability and biocompatibility. This study examines the potential application of a novel flax yarn waste-g-poly(acrylic acid-co-acrylamide) (FYW/PAA) superabsorbent in the absorbent core layer of sanitary napkins. Acrylic acid (AA) and acrylamide (AM) were grafted onto the pretreated flax yarn waste (PFYW) by free-radical graft copolymerization in homogeneous aqueous solution. The synthesis conditions of the FYW/PAA superabsorbent and its application performance for sanitary napkin were investigated. The results showed that, under the optimal synthesis conditions, the water absorbency of the prepared FYW/PAA reached 787.6 g/g in deionized water, 109.5 g/g in 0.9 wt% NaCl solution and 206.5 g/g in artificial blood solution. The composited absorbent core layer containing the FYW/PAA achieved the similar artificial blood solution absorbency of 192.6 g/g and retention of 83.9 wt% to those of the marketed sanitary napkin products. Meanwhile, a weight residue of 53.6 wt% was attained for the FYW/PAA after being buried in soil for 90 d.
研究领域:
材料科学
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环境科学
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化学工程
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DOI
高影响因子
CARBOHYDRATE POLYMERS
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2015
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IF 4.074
Chan Bai,Sufen Zhang,Lei Huang,Haiyan Wang,Wei Wang,Qingfu Ye
Starch , with properties of eco-friendliness and abundance, is one of the most important natural polymers. Starch-based hydrogels were investigated as carriers of carbendazim to combine controlled-release and water absorption (WA). Three carbendazim-loaded hydrogels (CLHs) with different WA capacities were prepared by solution polymerization. The CLHs were characterized by Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), and liquid-chromatography mass-spectrometry (LC–MS/MS). Release kinetics of CLHs was investigated using 14 C-labeling method. The diffusion parameters of CLHs were 0.47, 0.57 and 0.81 in deionized H 2 O (ddH 2 O). WA affected release profile significantly, the release longevity reaching 240 h when WA was 800 g/g in ddH 2 O. Solution pH influenced release profiles and the lowest release rate occurred in the lowest pH. Addition of CLH (1.3 g/kg soil) markedly increased water-holding capacity (WHC) of soil by 8.2%. The study indicated that starch-based CLH was a good controlled-release agent for carbendazim and water absorbent for soil.
研究领域:
农业科学
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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
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Yan Hao,Jing Qu,Lei Tan,Zunyi Liu,Yicheng Wang,Tingrui Lin,Hui Yang,Jing Peng,Maolin Zhai
An eco-friendly superabsorbent polymer (SAP) was prepared by grafting 2-acrylamido-2-methyl-1-propanesulfonic acid onto microcrystalline cellulose in lithium chloride/ N, N -dimethylacetamide system. The synthesized SAP (cellulose- g -PAMPS) was characterized by FTIR, TGA , SEM, 1 H NMR, 13 C NMR and XRD. The water absorption equilibrium of cellulose- g -PAMPS could be achieved within 10 min in distilled water. Moreover, the maximum water absorption capacities of cellulose- g -PAMPS in distilled water, 0.9 wt% NaCl solution and 3.2 wt% Na 2 CO 3 solution were 648.9, 298.4 and 207.3 g·g −1 , respectively. The water absorption behavior of cellulose- g -PAMPS was interpreted by the pseudo-second-order model. Furthermore, cellulose- g -PAMPS could be used in some extreme conditions due to its high acid and alkali resistance. The water retention rate of cellulose- g -PAMPS could be maintained above 90 % at 25 °C for 6 h. As a consequence, the synthesized SAP can be applied to increase the plant growth and survival time under drought conditions, even under saline alkali conditions.
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
CONSTRUCTION AND BUILDING MATERIALS
·
2025
·
IF 8
Honglei Chang,Xiuyu Liu,Zhengkun Guo,Feng Guo,Jian Liu
Concrete, a widely utilized construction material, is prone to micro-cracking due to external loads and environmental factors, leading to water infiltration and structural deterioration. Conventional repair methods are time-consuming, whereas self-healing mechanisms typically necessitate prolonged durations to become effective. This study investigates the self-sealing performance of concrete blended with novel water-absorbent capsules containing superabsorbent polymers (SAP). The capsules were designed to prevent premature SAP expansion during the mixing and curing stages, thereby enhancing the material's self-sealing capability upon crack formation. The research evaluated the capsules' waterproofing performance, expansion characteristics, and dispersion, followed by permeability tests on concrete specimens with through-cracks. The effects of multiple factors, including capsule dosage, SAP content, water-cement ratio (w/c), and different molding methods (cast-molded and press-molded), were examined. The results demonstrated that double-walled capsules containing 5 % SAP achieved the optimal balance of waterproofing and swelling behavior. Compared to other mixtures, press-molded concrete incorporating 5 % capsules and 7 % SAP showed the most robust self-sealing capacity, reducing permeability by up to 55.2 % over 60 min and 95.7 % over 540 min separately, significantly outperforming cast-molded specimens, which showed a maximum reduction of 65.1 %. X-ray Computed Tomography (XCT) analysis confirmed that the SAP within the capsules absorbed water and expanded, filling cracks and reducing crack volume by 12.6 % when exposed to a 5 % CsCl solution. These findings highlight the potential of water-absorbent capsules as an effective strategy for autonomous crack sealing in concrete structures. The press-molded method, in particular, provides better control over capsule breakage and SAP release, leading to more effective and prolonged sealing performance.
研究领域:
建筑材料
·
土木工程
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结构工程
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智能材料
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可持续建筑技术
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）