INDUSTRIAL CROPS AND PRODUCTS
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2020
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IF 4.244
Qiuqin Lin,Jiangyuan Wu,Yanglun Yu,Yuxiang Huang,Wenji Yu
Conventional natural fiber-based composites present substantial limitations regarding their dimensional stability, and flame retardancy, among other attributes. Our research focuses on examining and enhancing the properties of multifunctional fiber composites. In the initial phase, tannic acid (TA) was immobilized on wood fibers which absorbed the ferrous irons in the aqueous phase. Finally, the carriers were recycled to prepare composites via compounding with diphenylmethane di-isocyanate. The produced composites exhibited a 28 % improvement in dimensional stability compared with the control sample, while achieving significant enhancements in stiffness, hygroscopicity and flame-retardant properties due to the presence of TA-Fe complexes. Furthermore, the heat release rate and smoke production rate were decreased by 33 % and 77 %, respectively. The highly functional and versatile composites in this research are expected to possess a wide array of household applications.
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 MEMBRANE SCIENCE
·
2019
·
IF 7.015
Chuan Hu,Qiugen Zhang,Hongyue Wu,Xiuli Deng,Qian Yang,Peng Liu,Yanzhen Hong,Aimei Zhu,Qinglin Liu
Anion exchange membrane (AEMs) as a kind of important functional material are widely used in many fields including fuel cell, electrodialysis and water treatment. However, synthetic AEMs generally suffer a pernicious trade-off: high ion-conductive AEMs lack dimensional stability and vice versa. Herein we demonstrate a versatile strategy to prepare the AEMs with both high ion conductivity and excellent dimensional stability ( i.e. , low swelling ratio) via hydrophobic crosslinking and introducing hydrophobic chains. The hydrophobic length of crosslinkers has great influence on construction of highly efficient ion channels in the AEMs. Amazingly, the hydrophilic poly (phenylene oxide) (PPO) AEM crosslinked by 1,8-diaminooctane has the highest hydroxide conductivity that is further improved to 157.2 mS cm −1 (10% increases) with a low swelling ratio of 12.9% at 80 °C by introducing hydrophobic PPO backbone. This AEM not only overcomes the trade-off between the ion conductivity and the dimensional stability of crosslinked AEMs, but also breaks the upper bound between the ion conductivity and the water uptake. The newly developed strategy of hydrophobic dual-modifications promises to be an effective approach to develop the high-performance AEMs.
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
ACS Applied Polymer Materials
·
2021
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IF 4.089
Dongyue Wang,Qiuhui Ling,Yujing Nie,Yan Zhang,Wenhao Zhang,Hui Wang,Fangli Sun
This paper describes the action mechanism of a waterborne epoxy resin (WEP) cross-linked inside wood and its influence on wood dimensional, thermal, and fungal stability. The WEP prepared by phase inversion was impregnated into wood under vacuum-pressure treatment, followed by in situ cross-linking upon heating to form a hydrophobic network inside wood porous structures. The weight gain and volume increment of the treated wood combined with the morphological observation indicated that the WEP components were able to penetrate into wood cell lumens as well as cell walls, cross-link, and finally fix stably inside them. The good fixation of the epoxy resin network formed in wood reduced the leaching into water. Results from Fourier transform infrared (FTIR) spectroscopy confirmed the reaction between the epoxy and wood. In addition, it was found that the dimensional stability, thermal stability, and decay resistance of wood were improved with the WEP modification. The scanning electron microscopy images clearly showed that brown-rot fungus caused more serious damage to the structure of wood than white-rot fungus.
研究领域:
材料科学
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林业工程
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微生物学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2023
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IF 9.9
Ze Yu,Wei Ting Gao,Ying Jie Liu,Qiu Gen Zhang,Ai Mei Zhu,Qing Lin Liu
Anion exchange membrane fuel cells (AEMFCs), which are more economical than proton exchange membrane fuel cells (PEMFCs), stand out in the context of the rapid development of renewable energy. Superacid-catalyzed ether-free aromatic polymers have recently received a lot of attention due to their exceptional performance, but their development has been hampered by the trade-off between the dimensional stability and ionic conductivity of anion exchange membranes (AEMs). Here, we introduced fluoroketones containing different numbers of fluorinated groups (x = 0, 3 and 6) in the main chain of p-terphenyl piperidine because of the favorable hydrophobic properties of fluorinated groups. The results show that fluorinated AEMs can enhance OH − conductivity by building more aggregated hydrophilic channels while ensuring dimensional stability. The PTF6-QAPTP AEM with more fluorinated groups has the most excellent performance at 80 °C with an OH − conductivity of 142.7 mS cm −1 and a swelling ratio (SR) of only 4.55 %. Additionally, it exhibits good alkali durability, with the OH − conductivity and quaternary ammonium (QA) cation retaining at 93.45% and 92.6%, respectively, after immersion in a 2 M NaOH solution at 80 °C for 1200 h. In addition, the power density of the PTF6-QAPTP based single cell reaches 849 mW cm −2 when the current density is 1600 mA cm −2 . The PTF6-QAPTP based cell has a voltage retention of 88% after 80 h of stability testing at a constant current density of 300 mA cm −2 at 80 °C.
研究领域:
能源材料
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燃料电池
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
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IF 13.2
Lu He,Gege Bao,Xi Yu,Xiaofeng Zhang,Xiaobei Jin,Zixuan Yu,Rong Zhang,Daochun Qin
Bamboo is a sustainable structural material with excellent mechanical properties, but its high flammability and hygroscopicity restrict industrial utilization. This study develops a synergistic dual-modification approach using sodium silicate mineralization and hydrophobic treatment to enhance flame retardancy, mechanical strength, dimensional stability, and mold resistance. Compared to untreated bamboo, the modified bamboo exhibited 50.9%, 21.0%, 64.1%, and 16.7% reductions in peak heat release rate, total heat release, peak smoke production rate, and total smoke release, respectively. The Limiting Oxygen Index reached 36.0% with a Fire Performance Index of 1.4. Hydrophobic treatment reduced water absorption by 84.5% and thickness swelling by 52.2% (longitudinal), 52.0% (radial), and 57.6% (tangential), achieving a 147° water contact angle. Mechanical properties improved significantly, with modulus of elasticity and modulus of rupture increasing by 15.3% and 9.2%, respectively. Mold growth was completely inhibited under high humidity conditions. This strategy overcomes key limitations of bamboo in flammability, moisture sensitivity, and mechanical performance while preserving sustainability, thereby demonstrating significant potential for fire-safe construction and engineered biocomposites.
研究领域:
材料科学
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林产化学工程
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生物质改性
✓ 已验证
产品关联
DOI
高影响因子
POLYMER COMPOSITES
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2024
·Vol. 45
·期 12
·11447-11458
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IF 4.8
Zhijie Li,Zhaoyan Zhang,Huifan Cheng,Shaoping Qian,Yuenong Liu
Polypropylene carbonate (PPC) is a biodegradable polyester with excellent toughness and ductility that may be employed as carbon fixation materials in biomedicine, agriculture, and environmental engineering. However, relatively lower strength and poor dimensional stability hinder its extensive application. In this study, nanofibrillated cellulose (NFC) and chitosan (CS) were introduced as biobased reinforcements into PPC without compromising its biodegradability. Notably, the composites not only had improved strength but also enhanced toughness after the addition of NFC and CS. The tensile strength and Young's modulus were increased by 25% and 58% in the composites with 3 wt% NFC and 2 wt% CS additions compared to pure PPC. Interestingly, the PPC/NFC/CS composites exhibited superior dimensional stability and antibacterial property. Upon the addition of 3 wt% NFC and 2 wt% CS, the composites took 3 s recovering from 0° to 137°. Additionally, NFC and CS contribute to the hydrophilicity of PPC composites. These findings offer valuable insights into experimental data and preparation techniques to the utilization of PPC in engineering fields. Highlights The developed composites achieved maximum tensile strength (13.5 MPa). The composites with 2 wt% chitosan had effective antibacterial properties. All reinforced composites showed excellent dimensional stability. Nanofibrillated cellulose and chitosan had toughening and enhancing effect. The developed composites showed good hydrophilicity.
研究领域:
材料科学
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生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POLYMER SCIENCE
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2025
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IF 3.6
Zhengsheng Yang,Huanyong Liu,Peiheng Zhou,Haolan Li,Zhiheng Zou,Guang Yang
Concurrently achieving excellent optical properties, thermal stability, mechanical properties, dimensional stability as well as low dielectric constant of colorless polyimides (CPI) is urgently needed for flexible display and electronics. Here, CPI named PI-5 was designed and synthesized from 4,4′-(hexafluoroisopropylidene) diphthalic anhydride (6FDA), 2,2′-bis(trifluoromethyl) benzidine (TFMB), polyhedral oligomeric silsesquioxane (POSS) based micro-crosslinker and chain end tethered units. For comparison, other PI samples are synthesized by adjusting reactants. PI-5 film has excellent transmittance at 450 nm (92.8%) and yellowness index of 2.43. All PI samples are soluble in organic solvents showing good processability. POSS micro-crosslinker reduces the CTE of PI and POSS termination unit further decreases it to 17.4 ppm K −1 . Meanwhile, PI-5 has glass transition temperature ( T g ) of 356°C, 5 wt% weight-loss temperature of 522°C, tensile strength ( δ max ) of 265 MPa, Young's modulus ( E ) of 7.2 GPa. Additionally, PI-5 shows low dielectric constant ( D k ) and dielectric loss ( D f ) of 2.61 and 0.0072 at 1 MHz, as well as low water absorption value (0.39%). This work provides a new strategy to prepare mechanically robust CPI with enhanced general properties for flexible substrate, optoelectronic and related applications. Graphical
研究领域:
材料科学
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柔性电子学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2015
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IF 5.056
Zhenpeng Zhang,Kunzhi Shen,Liming Lin,Jinhui Pang
A series of novel tetra-quaternized poly(arylene ether ketone)s (QPAEK- x ) with high densely quaternized pendants are investigated in this work. As polymer electrolyte precursors, the four benzyl units containing poly(arylene ether ketone)s are prepared from 4,4′-difluorobenzophenone, 4,4′-(hexafluoroisopropylidene) bisphenol and designed bisphenol monomer . Then, the objective ionomer is successfully obtained via free-radical bromination, followed by quaternization of the four benzyl units containing poly(arylene ether ketone)s. These anion exchange membranes show excellent dimensional stability, adequate thermal stability and high hydroxide conductivity, owing to the pendent quaternary ammonium structures concentrated on the side chain. The highest hydroxide conductivity (0.0653 S cm −1 ) appears in QPAEK-0.8 (IEC=1.69 mmol g −1 ), and the swelling ratio of length is 11.7% at 80 °C. The suitable morphology is investigated using SAXS, which should be a possible reason for the enhancement.
研究领域:
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
ENERGY CONVERSION AND MANAGEMENT
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2021
·
IF 9.709
Zhaowen Huang,Meiqi Liu,Haibin Chen,Jiao-Ning Tang,Xing Ouyang,Da-Zhu Chen
This paper reports a novel high-performance phase change composite (PCC) featuring anisotropic high heat conduction ability and dimensionally stable properties for the hot-side thermal management of thermoelectric coolers. This composite is developed by employing paraffin as the phase change material and expanded graphite/phase change polymer (EG/PCP) binary networks as the supporting skeleton. The obtained paraffin/EG/PCP composite demonstrates an axial thermal conductivity of 2.62–6.11 W·m −1 ·K −1 and an even higher radial conductivity of 2.93–12.99 W·m −1 ·K −1 because the graphite sheets in the EG are aligned along the radial direction. The axial size of the composite presents a dimensionless increment of less than 0.0179 when the temperature increases from 25 to 80 °C, whereas the value for the radial size is 0.00284. The latent heat of the as-prepared composite reaches a relatively high level (128–175 kJ·kg −1 ) when the paraffin content is only 50–70 wt% because PCP in the composite also presents heat storage capability. Application of this composite in a thermoelectric cooling system for hot-side passive thermal management leads to a 1.55 °C decrease in the minimum temperature of the cold side compared to using bare substrates on the hot side. The running period of the composite integrated-system with a coefficient of performance (COP) higher than 0.2 is more than twice length compared to the running period of the system with bare substrates. This study sheds light on the development of PCCs with good comprehensive properties, which are promising for use in the thermoelectric field.
研究领域:
材料科学
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热能工程
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Xiang Long,Hao Yu,Peijian Zhang,Chen Qian,Mengze Lu,Yaqin Fu
Mechanically adaptive hydrogels with switchable mechanical properties have garnered significant attention due to their potential applications in various emerging fields. However, inevitable swelling and/or shrinkage associated with mechanical property switching lead to dimensional instability and structural failure of these hydrogels. This study synthesized dimensionally stable thermal-stiffening composite hydrogels by incorporating poly( N -isopropyl acrylamide) (PNIPAM)-grafted SiO 2 hybrid nanoparticles into a hydrogel matrix. By strategically localizing the thermo-responsive unit of PNIPAM at the interface between the SiO 2 nanoparticles and hydrogel matrix, the undesired swelling and shrinkage behavior are successfully eliminated, which are typically observed in conventional thermo-responsive mechanically adaptive hydrogels. The resulting composite hydrogels exhibit significantly enhanced dimensional stability compared to conventional counterparts and demonstrate superior response speed. Upon heating to 40 °C, the PNI-SiO 2 /P(AM- co -NIPAM)-2.0 hydrogel displays a tensile modulus of 22.4 kPa, strength of 60.5 kPa, and toughness of 127.1 kJ·m −3 , which is approximately twice that of its original state (12.2 kPa, 32.5 kPa, and 70.7 kJ·m −3 ). Moreover, both heating and cooling responses are completed within approximately 10 seconds while maintaining mass and volume changes below 3 %, with water content remaining at approximately 95 %. This work presents a design strategy for developing dimensionally stable mechanically adaptive composite hydrogels, which hold great promise for applications in tissue engineering, biomedical fields, and soft robotics.
研究领域:
材料科学
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生物医学工程
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组织工程
✓ 已验证
产品关联
DOI
高影响因子
ENERGY & FUELS
·
2024
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IF 5.2
Jingyi Sun,Dingbo Han,Ruiguo Dong,Jing Ge,Shuzhen Li,Han Guo,Ce Wang,Ping Hu,Yong Liu
Proton exchange membranes often encounter challenges with proton conductivity and dimensional stability under conditions of high temperature and low humidity. Incorporating proton-conductive nanofibers into the membrane fortifies its dimensional stability and establishes extra proton transfer channels at the interface between the fibers and matrix, thereby improving proton conductivity. This study utilized polyvinylidene fluoride (PVDF) fibers as a base material, modified with ethylenediamine to yield amine-functionalized cross-linked structures. UiO-66-NH2 and UiO-66-NH2–SO3H were then grown in situ on these fibers, and the resultant structures were integrated with Nafion to fabricate metal–organic framework (MOF)-modified nanofiber proton exchange membranes (NFPEMs). We examined the growth of MOFs and their role in enhancing the nanofiber proton exchange membrane’s properties. Both UiO-66-NH2 and UiO-66-NH2–SO3H were successfully incorporated, resulting in a maximum enhancement of proton conductivity by 149.69 and 80.38%, respectively, compared with PVDF@Nafion, and the proton conductivity of the MOF-loaded membrane reaches 152.11 ms/cm at 80 °C and 100% relative humidity. The swelling rates were also significantly reduced by up to 59.16 and 57.94%, relative to Nafion, effectively boosting dimensional stability and thermal stability. These improvements are attributed to the additional proton transfer channels formed by the MOFs, the contribution of acid–base pairs, limitations imposed by MOF porosity on water molecule mobility, and the supportive three-dimensional network conferred by PVDF. Findings from this research provide valuable guidance for the design of NFPEMs.
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
INDUSTRIAL CROPS AND PRODUCTS
·
2024
·
IF 5.6
Meihong Liu,Junye Wang,Qiming Yan,Jianxiong Lyu,Yafang Lei,Shaoyi Lyu,Li Yan
Furfuryl alcohol (FA) modification represents a sustainable approach to wood modification; however, it significantly reduces the toughness of the wood, limiting its practical applications. This study introduced epoxidized linseed oil (ELO) as an environmentally friendly and bio-derived plasticizer to enhance the toughness and mechanical properties of FA-modified wood. Microstructural analyses confirmed the integration of FA and ELO into the cellular structure of the wood. The chemical interactions between the epoxy groups of ELO and hydroxyl groups of FA were characterized using Fourier-transform infrared spectroscopy and nuclear magnetic resonance spectroscopy , illustrating that a ring-opening reaction occurred that grafted the long flexible aliphatic chains of ELO onto the FA chains, thereby enhancing the chain mobility and flexibility. This interaction significantly decreased the crosslinking density, thereby achieving toughening. FA–ELO modification resulted in significantly enhanced dimensional stability and mechanical properties. Specifically, the anti-swelling efficiency exceeded 80 %, while the modulus of elasticity , modulus of rupture, and along-grain compressive strength increased by up to 35.0 %, 36.8 %, and 45.7 %, respectively. Additionally, significant enhancements in the elongation at break and impact strength were achieved, at 369.1 % and 72.4 %, respectively. The loss factor also increased. The optimal ELO content was 20 wt%. This study effectively demonstrated how ELO mitigates the brittleness of FA-modified wood and supports its application in high-value fields such as construction.
研究领域:
材料科学
·
林学
·
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）