CELLULOSE
·
2025
·
IF 4.8
Zhao Feiyang,Liu Huijuan,Jin Yilin,Ru Hongfu,Wang Longfei,Xiang Shuangfei,Li Hao,Zhao Shujun,Fu Feiya,Camilleri Ing. Duncan,Liu Xiangdong
The application range of rice straw (RS) is limited by its poor flame and water resistance. It’s still a great challenge to endow RS fibers with excellent flame and water resistance properties without compromising the intrinsic mechanical properties. Here, a simple surface treatment strategy of RS fibers via co-treatment with phytic acid (PA) and calcium chloride (CaCl 2 ) was developed. First, PA was grafted onto RS fibers by esterification reaction. Then RS fibers were ionically crosslinked by CaCl 2 treatment. Modified RS fibers (PCRS) were then mixed with unsaturated polyester resin (UPR) to produce PCRS/UPR composites (PCRU). Benefiting from Ca 2+ complexes via the ionic crosslinking between Ca 2+ and –P (=O)–OH of the PA, –OH of the RS fibers, PCRU demonstrates enhanced tensile strength (12.04 MPa), good waterproofing capability, and flame-retardant performance. PCRU exhibites low water absorption rate (5.90%) and dimensional stability (thickness deformation less than 1.76%) after 168 h of water immersion. In addition, the limiting oxygen index and the total heat release of the prepared PCRU composites are 29.7 and 11.3 kJ/g, which reach the standard for flame retardant materials. Therefore, this study provides a simple and green pretreatment strategy of rice straw fiber for the applications in flame retardant, low water absorption, and dimensionally stable composites. Graphical
研究领域:
材料科学
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聚合物复合材料
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表面处理
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阻燃性能
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防水性能
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Polymer Materials
·
2025
·
IF 4.7
Changtao Pu,Jiaxin Yang,Shuang Jin,Yuhui Zhou,Wei Gong
The growing demand for environmentally friendly materials has driven significant interest in nonisocyanate polyurethane (NIPU) foams. This study presents a facile synthesis of self-blown NIPU foams through a conventional foaming process using binary and ternary cyclic carbonates, enabling the rapid formation of an enhanced polyurethane network within minutes without external nucleating agents. Through strategic incorporation of conductive and magnetic fillers, the modified NIPU foams exhibited exceptional electromagnetic interference (EMI) shielding performance, achieving a shielding effectiveness of 71 dB in the frequency range of 8.2–12.4 GHz. The porous architecture combined with the synergistic effect of functional fillers predominantly facilitated electromagnetic wave absorption, effectively mitigating secondary pollution. Notably, the modified foams demonstrated remarkable improvement in dimensional stability, reducing equilibrium water absorption from 397.5% to 276.7%, and a transition from hydrophilic (58°) to hydrophobic (110°) surface properties, addressing the inherent structural instability caused by hydroxyl groups under ambient conditions. The compressive strength of the foam enhanced from 0.019 to 0.26 MPa at 80% strain. This work not only provides a greener, simpler, and more efficient approach for NIPU production but also establishes a paradigm for designing functional polymeric foams for advanced applications.
研究领域:
材料科学
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环境科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED ENGINEERING MATERIALS
·
2024
·Vol. 26
·期 13
·2400481
·
IF 3.4
Mingjie Wu,Liang Shao,Chunyan Ma,Yinkun He,Yanlong Yang,Wenqi Wang,Jianzhong Ma,Zhanyou Ji
Thermoplastic polyurethane (TPU) elastomer is a commonly used material for foam preparation. However, its application is hindered by significant shrinkage behavior. To reduce the foam shrinkage, polylactic acid (PLA) and calcium stearate-modified montmorillonite (MMT-St) are incorporated into the polyurethane matrix. The TPU/PLA/MMT-St composite foams are formed using an intermittent supercritical carbon-dioxide-foaming process. The addition of PLA inhibits the relaxation of TPU chain segments, while the introduction of calcium stearate (GaSt 2 ) improves the dispersion of MMT within the matrix, increases the nucleation sites of cell growth, and improves cell structure. The cell diameter decreases from 10 to 4 μm, while the cell density increased from 4.1 × 10 12 to 15.8 × 10 12 cell cm −3 . In addition, the cell distribution range narrows from 4–19 to 2–6 μm. Incorporating MMT-St increases the crystallinity and thermal stability of TPU/PLA, mitigates chain relaxation at room temperature, and enhances foam dimensional stability. As a result, this leads to a decrease in shrinkage rate from 27.5% to 5%. As both matrices of the material are thermoplastic, this composite foam possesses recyclability with enhanced material utilization.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
ACS Applied Polymer Materials
·
2024
·
IF 4.4
Sihan Li,Yingqing Zhan,Fei Zhu,Hongshan Jia,Jie Liu,Xinyue Duan,Xianzhang Lei
The absence of anion exchange membranes (AEMs) that concurrently exhibit high hydroxide conductivity and superior dimensional stability poses a major challenge for the advancement of a high-performance AEM-based water electrolysis system. Herein, a series of block-cross-linked poly(aryl piperidinium) AEMs were prepared via superacid polycondensation, nucleophilic substitution, and the Menshutkin reaction. The molecular configuration of poly(aryl piperidinium) was manipulated by introduction of backbone rigidity, steric hindrance, and microphase-separated structures, thus realizing the design of distinct polymer network architectures for the AEM electrolysis application. It was found that the presence of nonrotatable carbazole molecules, which enlarged the molecular space within the polymer, contributed to the distinct hydrophilic–hydrophobic microphase separation structure. Moreover, the dual “block-cross-linking” strategy not only improved the structural stability of the polymer but also optimized its ion transport properties. Notably, AEMs featuring N-ethyl carbazole structure in their backbone exhibited remarkable dimensional stability (swelling ratio of 10 %, water uptake of 17.39 %), high mechanical stability (tensile strength of 43.12 MPa), and high conductivity of 113.55 mS cm–1. Furthermore, the practical application of c-QPCTP AEMs in AEMWEs was demonstrated, achieving a current density of 607 mA cm–2 at a constant voltage of 1.6 V. In addition, the AEMs can be maintained in stable operation for 66 h at a constant current density of 250 mA cm–2. Therefore, the chemical design in this work provides an alternative pathway to balance the dimensional stability and OH– conductivity of AEMs in the application of AEM-based electrolysis.
研究领域:
材料科学
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化学工程
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能源技术
✓ 已验证
产品关联
DOI
高影响因子
WOOD SCIENCE AND TECHNOLOGY
·
2023
·Vol. 57
·期 2
·523-535
·
IF 3.4
Zhou Yihang,Zhang Yue,Wang Kai,Hu Dongbo
Controls over the dimensions of waterlogged archaeological wood (WAW) upon drying are a critical issue for its conservation. Surface-initiated activator regenerated by electron transfer atom transfer radical polymerization (SI-ARGET ATRP) has been proven to be an effective consolidation method to increase the dimensional stability. However, the drawback of the current method is that the expansion stress generated during graft polymerization cannot be well controlled. An improved SI-ARGET ATRP system using a bifunctional monomer ethylene glycol dimethacrylate (EGDMA) to introduce a cross-linking process during the polymerization is presented in this paper. Both Pinus massoniana and Sapium sp. samples with different maximum moisture contents as 507% and 863%, respectively, show a reduced volumetric shrinkage of around 5% without any expansion phenomenon after the treatment. This method shows potential applications in the field of WAW conservation and may provide a new solution for consolidation of other organic archaeological objects as well as developing new wood-based materials.
研究领域:
考古学
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材料科学
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文物保护
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 138
·期 31
·50743
·
IF 3.125
Hui-Jie Nie,Yuan-Jie Zhang,Ya-Ru Yang,Ji-Peng Guan,Hai-Dong Li,Ben-Cai Lin,Xiao-Jun Shen
In order to expand the application of polypropylene (PP) composites in cryogenic environment, short carbon fiber (SCF) was used as the reinforcing phase and the surface of it was modified by graphene oxide (GO), and the maleic anhydride grafted PP (MAPP) was also used to enhance the interface compatibility between the fiber and the matrix. The effects of the GO-modified SCF and the MAPP on the impact properties and dimensional stability of PP composites at cryogenic temperature (CT) (− 196°C) were investigated by systematic analysis of the interfacial properties and microstructure of the composites. The results show that the impact strength of the PP composites was effectively increased by 106.7% (CT) and 170.7% (room temperature), respectively, compared to pure PP. In addition, the transverse and longitudinal shrinkage of PP composites can be reduced to only 0.15% and 0.1%, respectively. The cryogenic impact strength and dimensional stability of PP composites has been greatly improved, which makes PP composites in the application under cryogenic environment is more promising.
研究领域:
材料科学
·
复合材料工程
✓ 已验证
产品关联
DOI
高影响因子
ENERGY
·
2022
·
IF 8.857
Yanchen Li,Beibei Wang,Weiye Zhang,Junqi Zhao,Xiaoyang Fang,Jingmeng Sun,Rongqi Xia,Hongwu Guo,Yi Liu
Wood is widely used in the field of building materials as a green and renewable natural porous material. With the continuous increase of global carbon dioxide emissions and increasingly serious environmental problems, improving the energy storage performance of wood is conducive to reduce carbon dioxide and regulate the temperature of the living environment. In this work, a composite phase change material is prepared by introducing stable polyethylene glycol-based energy storage polymer (PGMA) into the porous structure of delignified wood by high temperature immersion method. The wood structure has a greater influence on the crystallinity of PGMA and the modifier is widely distributed inside the lumen and also the cell wall, with crystallinity of 90% PGMA-Wood up to 8.97% and it exhibits good dimensional stability at high temperature. The thermal conductivity of 90% PGMA-Wood is increased to 0.32W/m·K, which reaches 190% higher than that of original wood for the lattice heat transfer replaces phonon heat transfer. The phase change temperature of 90% PGMA-Wood meets the comfortable indoor temperature for human with the melting enthalpy and solidification enthalpy are 25.12 J/g and 31.59 J/g, respectively. The simulated sunlight experiment shows that under the same lighting conditions, the indoor temperature of the house model made by 90% PGMA-Wood is 3 °C higher than that of the house made of original wood, which also has stronger thermal insulation performance at low temperature. All above indicates that PGMA-Wood have great potential applications in the field of solar-thermal energy conversion and storage as building insulation board and agricultural greenhouses.
研究领域:
材料科学
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能源存储
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建筑材料
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Wenli Ma,Qiao Liu,Junmin Li,Lin Tian,Hong Zhu
Several poly (biphenyl piperidine-trifluoroacetophenone) based polymers with different grafting ratios of polar alkyl nitrile side chains are synthesized, named PBPAp-PN-x. The relationship between structure and performance is studied, including conductivity, swelling ratio (SR), morphology, single-cell performance, etc. The SR and conductivity at 80 °C of PBPAp-PN30% are 41.0% and 142.3 mS cm −1 , whereas those of PBPAp-PN0% are 77.8% and 155.3 mS cm −1 , respectively. Further, molecular dynamics (MD) simulations are carried out to microcosmically reveal the mechanism of structure-property relationship, which simulate the number of water molecules ( N H2O ) and the diffusion coefficients ( D ). The simulations also indicate polar cyanide groups can form close contacts, which is similar to physical crosslinking to inhibit the swelling of backbone. As a result, the advantage of grafting dipolar molecules in AEMs not only effectively resolves the “trade-off” problem between ionic conductivity and dimensional stability, but also might be a promising application in fuel cells.
研究领域:
材料科学
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化学工程
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2017
·
IF 3.181
Mengmeng Yao,Yiqin Yang,Junlong Song,Yan Yu,Yongcan Jin
In order to valorize lignin from spent liquor of pulping mills, a novel catalyzing system for wood furfurylation which composed of lignin-derived acids (LDAs, i.e. lignosulfonic acid and sulfomethylated lignin acid) and buffer sodium borate was developed, and was applied to Chinese fir furfurylation for improved dimensional stability and mechanical properties. LDAs were prepared by protonating of sulfomethylated lignin and lignosulfonate through cation exchange resin. The catalyzing system was optimized by the storage duration of FA formulas with respective catalyzing system at room temperature and the curing time at elevated temperature. Then, three formulas were selected out to treat Chinese fir and their performance was evaluated by weight percentage gain, dimensional stability, and compressive strength. The results showed that LDAs, especially sulfomethylated lignin acid, penetrated into cell walls and catalyzed furfurylation reaction quite well. The best performance achieved in this study by Formula III was with weight percentage gain of 66.4%, equilibrium moisture content 12.9%, anti-swelling efficiency 61.9% and 70.6% for the conditions of high humidity and water-soaking, respectively; its parallel-to-grain compressive strength was improved by 45.4%. It hints lignin-derived acids combined with borate would be a promising catalyst system for wood furfurylation since it valorizes both the waste lignin and low-valued wood.
研究领域:
林产化学与技术
·
木材科学与技术
✓ 已验证
DOI
高影响因子
European Journal of Wood and Wood Products
·
2025
·Vol. 84
·期 1
·7
·
IF 2.5
Yu Fanjun,Wang Yonggui,Xie Yanjun,Qiu Zhe,Zhang Tianpeng,Xiao Zefang
A lignin-based wood modification strategy was proposed by impregnating a composite aqueous modifier consisting of allylated lignin (AL), unsaturated phytic acid amine (TEPA-GMA-PA), and N-hydroxymethyl acrylamide (NMA). The system was designed to enhance the dimensional stability, mechanical properties and flame retardancy of fast-growing fir. AL was synthesized through etherification of industrial alkali lignin with allyl glycidyl ether, endowing the lignin with reactive unsaturated sites for crosslinking. Meanwhile, TEPA-GMA-PA was prepared via a ring-opening addition reaction between glycidyl methacrylate and tetraethylenepentamine, followed by neutralization with phytic acid. The successful synthesis of AL and TEPA-GMA-PA was demonstrated by Fourier Transform Infrared Spectroscopy and Nuclear magnetic resonance spectroscopy. The resulting compound modifier was blended with NMA to form an aqueous polymerizable system. Leaching test demonstrated that the modifier underwent in situ polymerization within the wood structure to form water-insoluble macromolecules, reducing the leaching rate to 34.9%. Modified wood exhibited significant mechanical enhancement with 30.8% and 19.6% increases in modulus of rupture and modulus of elasticity, respectively, while maintaining impact strength to natural wood. Flame retardancy improvements were confirmed by cone calorimetry showing 35.6% reduction in total heat release and 7.2% decrease in total smoke production. Furthermore, the limiting oxygen index increased from 22.6 to 34.7%. The proposed strategy provided a new approach for improving of high-value utilization of wood with lignin-based modifier.
✓ 已验证
产品关联
DOI
高影响因子
DESALINATION
·
2025
·
IF 9.8
Huimin Ruan,Zhipeng Xu,Junyao Wang,Meng Wang,Zhihao Lin,Ning Ding,Daohui He,Jiangnan Shen
Ion exchange membranes have become indispensable in seawater desalination and wastewater treatment. However, traditional membranes with high ion exchange capacity suffer from excessive swelling. Meanwhile, overcoming the “trade-off” between membrane dimensional stability and ionic conductivity remains a critical challenge. In this work, a series of fluorinated polyaryl ether-based anion exchange membranes (AEMs) with varying hydrophobic chain content were designed. Results indicated that the incorporation of a rigid polymer backbone and the introduction of fluorinated groups exert a significant influence on the electrochemical properties of ion exchange membranes. The optimal QFPAE-x membrane exhibited good dimensional stability even at a high ion exchange capacity (IEC) of 2.16 mmol/g with a low swelling rate of 6.73 % at 25 °C. The membrane showed a surface resistance of 1.65 Ω·cm 2 and a water uptake of only 15.83 %. Furthermore, its cross-linking-free structure enabled superior dimensional stability and desalination performance. Electrodialysis desalination experiments show that the current efficiency and energy consumption perform better than commercial membranes. The cycle desalination experiments demonstrated the durability of the QFPAE-x membranes. This work demonstrates that fluorinated polyaryl ether AEMs with optimized hydrophobic chains effectively balance ion exchange capacity and dimensional stability, holding potential for efficient desalination and water treatment applications.
研究领域:
材料科学
·
膜科学与技术
·
环境工程
·
水处理技术
·
电化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Research and Technology-JMR&T
·
2025
·
IF 6.6
Dengkang Guo,Sheng Yang,Wenting Ren,Gaiyun Li
Wood is a key raw material for indoor phase change energy storage materials, but balancing energy storage efficiency and physical performances is a hard nut to crack. This study proposed a novel method of heterogeneously encapsulating phase change agents and enhancement components in wood cells. The method aimed to make wood-based phase change energy storage composites with high mechanical performance and dimensional stability. Analysis showed that low-concentration PEG (≤20 %) infiltrates cell walls to improve dimensional stability. Higher concentrations (>20 %) first saturate the walls and then occupy the cell cavities for latent heat storage. The epoxy polymer fills the remaining cavities, thereby reducing PEG leakage and improving the mechanical properties of the wood. Through comprehensive property evaluation, a PEG 800 solution concentration of 40 % was determined to be optimal in the first step, achieving a balanced phase-change enthalpy of 20.11 J/g, improved dimensional stability (water-soaking anti-swelling efficiency: 68.01 %), and enhanced mechanical performance. This research had the potential to significantly promote the practical application of wood-based energy storage materials.
研究领域:
材料科学
·
储能技术
·
木材科学
·
复合材料
·
高分子科学
✓ 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）