JOURNAL OF MEMBRANE SCIENCE
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2024
·
IF 8.4
Jiayu Guan,Xi Sun,Huiting Yu,Jifu Zheng,Yuxuan Sun,Shenghai Li,Guorui Qin,Suobo Zhang
Sulfonated polyarylene membranes are demonstrated to be efficient as proton exchange membranes (PEMs) for proton exchange membrane fuel cells (PEMFCs) in clean energy conversion systems. In this study, we design and synthesize a series of sulfonated polyarylene with all-carbon backbones and densely sulfonated pendant groups, which can be prepared by copolymerization of 1,3-Disulfonic acid benzaldehyde, 1,1,1-trifluoroacetone and biphenyl under superacid-catalyzed conditions. Rigid, hydrophobic backbone and hydrophilic side chains make the membrane form good microphase separation morphology. The PEMs exhibit high proton conductivity (404 mS cm −1 ) and excellent dimensional stability (swelling ratio lower than 24% and water uptake lower than 40%) at 80 °C. Moreover, the PEMs show good oxidization stability (the retaining weight rate of membrane up to 99.2% for 1 h oxidative treatment), and the oxidization stability and degradation mechanism of Ar 3 CH in polymer backbone are also studied. The H 2 /O 2 fuel cell assembled with PEMs exhibited a maximum peak power density of 560 mW cm −2 . It indicates that all-carbon main chain and densely sulfonated structure show great potential for improving the performance of PEMs.
研究领域:
材料科学
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能源工程
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2025
·
IF 7.3
Demiao Chu,Xiaochuan Ren,Zhenhao Ding,Stavros Avramidis,Sohrab Rahimi,Jun Mu,Cuimei Luo,Xujie Wang,Vahid Nasir,Shengquan Liu
Conventional heat treatment is an industrialized and environmentally friendly wood modification method but is considered a self-catalysis-reacted modification and energy-intensive consumption process. This research uses exogenous phosphoric acid (EPA) to facilitate the thermal reaction of wood and thoroughly investigates the catalytic mechanism of acid treatment during the heat treatment process. Poplar wood was first impregnated with a 0.05 and 0.5 mol/L EPA solution and then subjected to 120∼180 °C for 1 and 2 h. The results revealed that EPA enlarged the reaction of wood to heat, acid-heat-treated (AHT) wood’s color deepened, and dimensional stability enhancement was superior to conventional heat-treated (CHT) wood. The antiswelling rate of the AHT wood (AHT0.05–180–2 and AHT0.5–180–2) was 2.72- and 4.26-fold compared to CHT180–2, and the color difference was 8.8% and 614.2% higher. The AHT0.5–120–1 wood’s antiswelling rate reached the same level as that of CHT180–2, with a 1/3 reduction of treatment temperature and a 50% decline in holding time. Pyrolysis kinetics analysis revealed that the hemicellulose’s activation energy (Ea) declined, whereas the Ea of lignin changed according to EPA concentration. Interestingly, the EPA increased the Ea of wood and cellulose because of its carbonization effect at a higher temperature, which endowed a potential fire resistance capacity to the AHT wood. EPA reduced the initial thermal degradation temperature of wood and wood components, providing an efficient way to induce discoloration and improve wood dimensional stability. This novel modification technique requires less energy consumption and endows multifunctionality in wood. The outcomes offer a new sustainable and high-efficiency chemical combined thermal processing technology for wood.
研究领域:
林学
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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
CHEMICAL ENGINEERING JOURNAL
·
2020
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IF 10.652
Huaxiu Xu,Pingping Xu,Di Wang,Yang Yang,Xionglei Wang,Ting Wang,Wenli An,Shimei Xu,Yu-Zhong Wang
Hydrogel-born foam materials have been intensively developed because of great potential in various fields and environmental friendliness with water as foaming agent. However, the energy-consuming nature and pore collapse in the preparing and using process limit their application. Herein, a facile strategy is present to fabricate a dimensional stable hydrogel-born foam by simple acid-heat treatment and subsequent fast microwave foaming. The microwave heating rapidly evaporates and expands water into cells in the gel while the heat softening of the hydrogel further facilitates the formation of the cells. Moreover, the hydrophilicity/hydrophobicity and the crosslinking degree of the foam can be regulated by controllable conversion of amide groups of the hydrogel to the imide groups during the acid-heat treatment. As a result, it successfully avoids the pore collapse in both of the preparation and use process. With hierarchical pore structure and controllable moisture absorption, the foam shows with excellent dimensional and thermal insulation. In addition, the foam provides superior mechanical properties and fire retardance over traditional foams. The flame-retardant mechanism was proposed. The fabrication of this hydrogel-born foam is facile, flexible and can be adapted for extensive applications in building structures.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
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2019
·Vol. 9
·期 62
·36374-36385
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IF 3.049
Chao Wang,Nengxiu Pan,Yuliang Jiang,Junbin Liao,Arcadio Sotto,Huimin Ruan,Congjie Gao,Jiangnan Shen
Novel anion exchange membranes with enhanced ion exchange capacity, dimensional stability and alkali stability were prepared by a facile synthesis method. Internal crosslinking networks in the resulting membranes were achieved by reacting chloromethylated polysulfone with 4,4′-trimethylene bis(1-methylpiperidine) (BMP), where BMP was used as both a quaternization reagent and crosslinker without requirement of post-functionalization. In order to evaluate the alkali resistance and dimension stability performance of the resulting membranes, the molar ratio of BMP in the resulting membranes was fixed at four different contents: 40%, 60%, 80% and 100%. The obtained membranes were accordingly denoted as CAPSF-N, in which N = 40, 60, 80 and 100, respectively. Due to the dense internal network structure and spatial conformation of the six-membered rings, the resulting CAPSF-N AEMs showed enhanced dimensional structures (at 60 °C, the water uptakes and swelling ratios of CAPSF-N were 8.42% to 14.84% and 2.32% to 5.93%, respectively, whereas those for the commercial AEM Neosepta AMX were 44.23% and 4.22%, respectively). In addition, after soaking in 1 M KOH solution at 60 °C for 15 days, the modified membranes exhibited excellent alkaline stability. The CAPSF-100 membrane showed the highest alkali stability (retained 85% of its original ion exchange capacity and 84% of its original OH− conduction after the alkaline stability test), whereas the non-crosslinked APSF broke into pieces. Additionally, compared to the commercial Neosepta AMX membrane under the same test conditions, the desalination efficiency of CAPSF-100 was enhanced, and the energy consumption was lower.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
WOOD SCIENCE AND TECHNOLOGY
·
2022
·Vol. 56
·期 3
·813-831
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IF 2.898
Guo Dengkang,Yang Sheng,Fu Feng,Guo Nai,Li Gaiyun,Chu Fuxiang
The range of application for fast-growing plantation wood is limited by its dimensional instability, susceptibility to biodegradation and low mechanical strength. In this study, a novel method based on in situ reaction of a hydrophilic epoxy monomer (1,4-butanediol diglycidyl ether) in the wood cell walls was proposed to improve the performance of plantation wood. The effects of curing agent on the reaction mechanism and performance of treated wood were discussed in detail. The results demonstrated that after curing using methyl hexahydro phthalic anhydride (MHHPA), an epoxy oligomer with a higher molecular weight and superior water resistance was formed inside the wood cell wall compared to curing with the 2-methylimidazole (2-MI). Moreover, the epoxy group was able to react with alcohol and phenolic hydroxyl in wood through 2-MI catalysis resulting in a higher grafting ratio. After the modification reaction, notable improvements were observed in the dimensional stability (anti-swelling efficiency of more than 65%), fungal ( Gloeophyllum trabeum ) decay resistance (weight loss of < 6%) and compressive strength (increased by 17%) of the wood.
研究领域:
材料科学
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林学
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2023
·Vol. 15
·期 12
·2637
·
IF 5
Jianchao Zhou,Li Jin,Xinxing Wu,Hui Wang,Shuaibo Han,Yan Zhang,Fangli Sun
The environmental moisture changes would result in the deformation and cracking of laminated bamboo lumber (LBL) easily due to the unreleased internal stress, leading to poor durability. In this study, a hydrophobic cross-linking polymer with low deformation was successfully fabricated and introduced in the LBL by polymerization and esterification to improve its dimensional stability. In an aqueous solution, the 2-hydroxyethyl methacrylate (HEMA) and Maleic anhydride (MAh) were employed as the base compounds for synthesizing the copolymer of 2-hydroxyethyl methacrylate and maleic acid (PHM). The hydrophobicity and swelling performance of the PHM was adjusted by controlling the reaction temperatures. PHM-modified LBL’s hydrophobicity as indicated by the contact angle, increased from 58.5° to 115.2°. The anti-swelling efficiency was also improved. Moreover, multiple characterizations were applied to clarify the structure of PHM and its bonding linkages in LBL. This study demonstrates an efficient avenue to facilitate the dimensional stability of LBL by PHM modification and sheds new light on the efficient utilization of LBL using a hydrophobic polymer with low deformation.Keywords:laminated bamboo lumber;hydrophobic polymer;dimension stability;anti-swelling
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
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2024
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IF 5.6
Jingpeng Li,Xiao Han,Sisi Yao,Dengkang Guo,Fuxiang Chu
The dimensional instability and flammability issues of wood hinder its application as a structural material in construction. In this study, we integrated wood surface densification technology with a chemical modification strategy to develop flame-retardant, high-strength, and dimensionally stable woods. The modified wood demonstrates a flexural strength of 193.98 MPa, surpassing that of the majority of both inorganic and organic materials. Additionally, after being immersed in water for 24 h, the composite material exhibits a rebound rate of merely 2.62 % and a water absorption rate of 3.16 %. Most significantly, the material's flame retardancy is substantially enhanced after treatment, resulting in negligible combustion when exposed to an open flame. The analyses reveal that surface densification chiefly improves the mechanical properties of wood. The introduction of ammonium dihydrogen phosphate (ADP) into cell walls enhances dimensional stability and flame retardancy, but it comes at the expense of mechanical performance. However, when epoxy polymer is introduced into the cell cavity, it effectively counteracts the adverse impact of ADP, thereby improving both the mechanical properties and dimensional stability of wood. This study effectively addressees the challenges of dimensional instability and flammability inherent in wood as a structural material in construction.
研究领域:
材料科学
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林业工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
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2024
·
IF 8.3
Fei Wang,Ting Qu,Huiyu Yang,Haiyang Yang,Ying Ou,Quanyuan Zhang,Fan Cheng,Fuqiang Hu,Hai Liu,Zushun Xu,Chunli Gong
Anion exchange membranes (AEMs) are increasingly becoming a popular research area due to their ability to function with nonprecious metals in electrochemical devices. Nevertheless, there is a challenge to simultaneously optimize the dimensional stability and ionic conductivity of AEMs due to the “trade-off” effect. Herein, we adopted a novel strategy of combining filling and cross-linking using functionalized bacterial cellulose (PBC) as a dual-functional porous support and brominated poly(phenylene oxide) (Br-PPO) as the cross-linking agent and filler. The PBC nanofiber framework together with cross-linking can provide a reliable mechanical support for the subsequent filled polymer, thus improving the mechanical properties and effectively limiting the size change of the final quaternized-PPO (QPPO)-filled PBC composite membrane. The composite membrane showed a very low swelling ratio of only 10.35%, even at a high water uptake (81.83% at 20 °C). Moreover, the existence of multiple −NR3+ groups in the cross-link bonds between BC and Br-PPO can provide extra OH– ion transport sites, contributing to the increase in ionic conductivity. The final membrane demonstrated a hydroxide ion conductivity of 62.58 mS cm–1, which was remarkably higher than that of the pure QPPO membrane by up to 235.93% (80 °C). The successful preparation of the PBC3/QPPO membrane provides an effective avenue to tackle the trade-off effect through a dual-functional strategy.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COMPOSITES PART B-ENGINEERING
·
2024
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IF 12.7
Xinpu Li,Hanzhou Ye,Xiang Zhao,Yanjun Li,Ge Wang
The development of thin-type bamboo bundle laminated veneer lumber (T-BLVL) represents a significant advancement in environmentally friendly and sustainable building materials . However, the application of T-BLVL is still hindered by poor dimensional stability and low mechanical strength . In this study, the delignified thin-type bamboo bundle laminated veneer lumber (D-T-BLVL) was prepared through the partial delignification of bamboo bundles and the synergistic effects of phenolic resin (PF). These effects included gluing, strengthening, and waterproofing. D-T-BLVL exhibited high strength, dimensional stability, and a remarkable thickness of only 5 mm. After the removal of 26 % lignin, the porosity of bamboo bundles increased by 117 % compared with natural bamboo bundles, facilitating enhanced PF infiltration. D-T-BLVL exhibited a bending strength of 281.84 MPa, representing an 83.75 % increase over that of T-BLVL (153.38 MPa). Additionally, the water absorption thickness expansion rate of D-T-BLVL (3.37 %) was only approximately 1/4 times that of T-BLVL (13.30 %). The development of D-T-BLVL provides valuable guidance for developing wind turbines , infrastructures, and other advanced technologies.
研究领域:
材料科学
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林业工程
✓ 已验证
产品关联
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2024
·
IF 7.4
Yu Tian,Wenyan Guo,Zhuo Huang,Yunyan Peng,Junfeng Hou,Xiaolong Fang,Youming Yu,Wenbo Che
Wood is an attractive bio-based building material whose properties are often affected by environmental moisture, ultraviolet, and fungi. Chemical modification is an effective way to improve wood properties ( e.g. , dimensional stability and decay resistance) and thus extends the service life of its products. However, traditional chemical modifiers often contain mild toxicity or volatiles, which harms the operator and environment. Herein, a carboxylated sucrose (CS) was prepared by a green synthesis route using natural compounds (sucrose and malic acid) and used to enhance the properties of wood. The CS penetrated the wood through vacuum-pressure impregnation, which can self-polymerize and be deposited in the cell lumen and chemically bonded to cell wall components , thus efficiently sequestered within the wood. The CS treated wood (CS-wood) exhibited excellent dimensional stability with 41 % of ASE due to its cross-linking with cell walls. Besides, the modulus of elasticity and compressive strength of CS-wood increased by 21 % and 20 % compared with untreated wood, respectively. Notably, CS can help extend the wood service life by limiting the adsorption and migration of moisture in wood cells to improve the UV and decay resistance of the wood. This whole-process friendly approach to preparing biomass-derived CS modifiers effectively improved wood properties, which may provide innovative concepts and insights for wood modification research.
研究领域:
材料科学
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林学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Scientific Reports
·
2019
·Vol. 9
·期 1
·1-9
·
IF 4.011
Zhou Yihang,Wang Kai,Hu Dongbo
To explore new methods to maintain the dimensional stability of waterlogged archaeological wood after drying and keep the natural cell lumens unaltered for future retreatments, activator regenerated by electron transfer (ARGET) atom transfer radical polymerization (ATRP) is employed to consolidate archaeological wood. To prepare the ATRP process, the waterlogged archaeological wood samples ( Pinus massoniana with maximum moisture content of around 529%) were first modified by 2-bromoisobutyryl bromide in CH 2 Cl 2 to acquire C-Br bonds as initiators. Then, butyl methacrylate or styrene was polymerized to the remaining cell walls with catalyst (CuBr 2 ), reductant (ascorbic acid) and ligand (PMDETA) in ethanol. After the treatment, the samples were washed and naturally dried. The results characterized by microscopy showed that the polymerization only took place within the remaining cell walls, showing no sign of collapse or distortion after air drying, and all natural cell lumens could be retained for future retreatments. Also, anti-shrinkage efficiencies as high as 87.8% for the wood sample grafted with polystyrene and 98.5% for the wood sample grafted with polybutylmethacrylate were obtained from the treatment described in this paper, indicating modification of grafting polymer through ARGET ATRP can help maintain the dimensional stability of water archaeological wood effectively.
研究领域:
考古学
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聚合物化学
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文物保护科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2020
·
IF 4.939
Kai Li,Jia Chen,Mingming Guan,Shaokun Tang
The “trade-off” effect between hydroxide conductivity and dimensional stability is challenging issue for anion exchange membrane fuel cells (AEMFCs). In this study, the framework of UiO-66-NH 2 is for the first time applied to anion exchange membranes (AEMs). The robust pore walls of UiO-66-NH 2 with mechanical and structural durabilities protect the membrane from the excessive swelling effects (a swelling ratio of 7%). In addition, the framework of UiO-66-NH 2 is directly modified into (UiO-66-NH 2 ) + Cl − as hydroxide conduction channels by anion stripping for the first time. And we construct well-organized ion nanochannels by the in-situ self-assembly of N,N,N′,N' -tetramethyl-1,6-hexanediamine (TMHDA) and allyl bromide within the highly ordered pores of (UiO-66-NH 2 ) + Cl − . The obtained QA@(UiO-66-NH 2 ) + Cl − then incorporated into pristine membrane (QAPPO) to fabricate the novel multi-channel AEMs. The hydroxide conductivity of QA@(UiO-66-NH 2 ) + Cl − /PPO is up to 123 mS⋅cm −1 at 80 °C, which is greatly improved compared to QAPPO pristine membrane.
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
危险品化学品经营许可证（带存储）