CELLULOSE
·
2018
·Vol. 25
·期 9
·5309-5321
·
IF 3.809
Pan Ying,Liu Longxiang,Zhao Hongting
Abstract Recyclable flame retardant paper was made by constructing zinc coordinated multi-layered coatings consisting of positively charged polyethylenimine/melamine and negatively charged phytic acid. Herein, with the paper matrix as a carbon source, phytic acid was chosen as the acid source, while polyethylenimine and melamine served as the blowing agent. The successful deposition of zinc ion coordinated coating on the surface of paper fiber was confirmed by scanning electron microscopy and energy-dispersive X-ray. The weight gain of the paper (P) treated with 4 (P–4BL) and 8 (P–8BL) bilayers of coating were 5.5 and 10.1 wt%, respectively. After coordination with zinc ion, P–4BL–Zn and P–8BL–Zn were obtained with weight gains of 6.7 and 13.6 wt%, respectively. The thermal stability and flammability were evaluated by thermogravimetric analysis (TGA), horizontal burning and microscale combustion calorimeter (MCC) tests. TGA results demonstrated that the thermal stability of the treated sample was significantly enhanced at high temperature, as evidenced by the improvement of char residue at 700 °C for P–8BL–Zn to 31.6% as compared with that of untreated paper (1.6%). The P–8BL and P–8BL–Zn samples could achieve self-extinguishing in the horizontal burning test. MCC results showed that the peak heat release rate and the total heat release of P–8BL–Zn were reduced by 43 and 49% as compared to those of the untreated paper, respectively. Furthermore, the zinc ion coordinated coating displayed better in-water durability than the un-coordinated one, which made it possible recyclable flame retardant coating. Graphical abstract
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Chen Xu,Fanyang Meng,Yaru Li,Hui Pan
A ternary acidic deep eutectic solvent (EH/MA/PEG400 DES) was synthesized with ethylamine hydrochloride (EH), DL-malic acid (MA) and polyethylene glycol 400 (PEG400) for the pretreatment of bamboo biomass. The EH/MA/PEG400 DES possessed superior biomass pretreatment capability, resulting in the removal of 75.42 % hemicellulose and 85.30 % lignin while retaining the majority of the cellulose (87.53 %) under a relatively high solid/liquid ratio (1:7). Pretreated bamboo biomass obtained a high glucose yield of 87.38 % after 72 h of enzymatic hydrolysis. Furthermore, EH/MA/PEG400 DES exhibited exceptional recyclability, which could afford 79.34 % lignin removal and 85.29 % glucose yield even at the seventh pretreatment cycle without introducing of fresh DES. The analysis on the recovered DES revealed that the accumulation of formic acid generated from carbohydrate degradation during the pretreatment process should account for the excellent recyclability of the EH/MA/PEG400 DES. The findings in this study could offer a sustainable and efficient approach for the lignocellulosic biomass refining.
研究领域:
生物化学
·
可再生资源技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2024
·
IF 3.8
Mengyue Wang,Wentao Dong,Xi Lu,Hongyu Zhao,Qin Yang,Bin Yan
The reprocessing stability and recyclability of bio-based thermosetting materials have positive environmental and economic values. In this work, two types of lignocellulosic polyimide vitrimers were developed from two lignin-derived aldehyde monomers and a cellulose-derived diamine monomer based on a dynamic covalent adaptive network. Both polyimide vitrimers demonstrated high fracture strengths of up to 67.5 and 40.2 MPa, and the vitrimers had no obvious dissolution and weight change after soaking in ten common solvents for 30 days. Similar to other literature reports, the vitrimers still maintained more than 92% fracture strength after 5 fracture–hot-press cycles. Besides, due to the presence of large amounts of nitrogen and phosphorus elements, both vitrimers exhibited good flame-retardant properties: they could self-extinguish in 10 s while removing the flame after ignition and generated no molten droplets. More importantly, these two highly cross-linked thermoset materials were efficiently transformed back into related monomers, guaranteeing excellent monomer–polymer–monomer closed-loop recycling. The stable cycle processability and efficient closed-loop recovery of lignocellulosic thermosetting materials provided the possibility of the efficient utilization of biomass materials. Furthermore, the successful preparation of basalt fiber composites with high mechanical properties and easy recovery demonstrated the application potential of these vitrimers.
研究领域:
材料科学
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化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2020
·Vol. 138
·期 4
·49748
·
IF 2.52
Qian Zhang,Guokang Chen,Kun Wu,Jun Shi,Liyan Liang,Mangeng Lu
The booming of modern electronic devices featuring increasing power and multi-functionalization demands novel high thermal conductive materials with various functions, such as self-healing property and high deformability, while traditional polymer-based or metallic-based materials could hardly provide. Therefore, we report a high thermal conductive and disulfide-based self-healable and reprocessible liquid crystalline elastomer (SHLCE) composite by incorporating graphene nanoplates (GNPs) fillers. The obtained GNPs/SHLCE composites exhibited desired thermal conductivity (5.08 Wm −1 K −1 ) when the content of GNPs was 20 wt% to the composites. Moreover, the GNPs/SHLCE composites showed intriguing recycled performance (Tensile strength after recycle could maintain over 93% compared with that of original composites). Furthermore, we concluded that the improved thermal conductivity of GNPs/SHLCE composites was beneficial to the thermal induced reprocessible and shelf-healable systems.
研究领域:
材料科学
·
纳米技术
✓ 已验证
DOI
高影响因子
ACS Applied Polymer Materials
·
2021
·
IF 4.089
Yanzi Ke,Xiangyu Yang,Qian Chen,Junqi Xue,Zhijian Song,Yuehong Zhang,Samy A. Madbouly,Ying Luo,Mei Li,Qingwen Wang,Chaoqun Zhang
The development of multifunctional polymeric materials from renewable resources is of foremost significance from a sustainable development perspective. In this work, a biobased epoxy monomer (EHCPP) with hard core structures and multi-arms was prepared from cardanol with hexachlorocyclotriphosphazene, followed by epoxidation with m-chloroperoxybenzoic acid (m-CPBA). Then, the epoxy polymer networks were prepared via the curing process of EHCPP with four thiol monomers of different thiol groups. The mechanical and thermomechanical properties, thermal stability, solvent resistance, recyclability characteristics, and optical behavior of the cardanol-based epoxy resins were systematically investigated. The results showed that four epoxy resins (EHCPP-2SH, EHCPP-3SH, EHCPP-4SH, and EHCPP-BDB) not only exhibited excellent solvent resistance in 10 wt % aqueous solutions of NaOH, HCl, and NaCl but also showed intrinsic fluorescence, while only the EHCPP-BDB epoxy resin showed phosphorescence behavior. Recyclability was observed in the EHCPP-BDB polymer network due to the presence of dynamic reversible boron ester bonds. These cardanol-based epoxy-thiol polymer networks open a pathway to explore potential biomass resources for high-performance multifunctional materials as a replacement for petroleum-based thermosets in various industrial applications.
研究领域:
材料科学
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可持续发展
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ORGANIC CHEMISTRY
·
2018
·
IF 4.805
Zhenhua Dong,Jinwei Yuan,Yongmei Xiao,Pu Mao,Wentao Wang
A rapid and practical protocol for the chemoselective deoxygenation of various aromatic ketones and aldehydes was described, which used a tandem catalyst composed of heterogeneous Pd/TiO2 + homogeneous FeCl3 with the green hydrogen source, polymethylhydrosiloxane (PMHS). The developed catalytic system was robust and scalable, as exemplified by the deoxygenation of acetophenone, which was performed on a gram scale in an atmospheric environment utilizing only 0.4 mol % Pd/TiO2 + 10 mol % FeCl3 catalyst to give the corresponding ethylbenzene in 96% yield within 10 min at room temperature. Furthermore, the Pd/TiO2 catalyst was shown to be recyclable up to three times without an observable decrease in efficiency and it exhibited low metal leaching under the reaction conditions. Insights toward the reaction mechanism of Pd-catalyzed reductive deoxygenation for aromatic ketones and aldehydes were investigated through operando IR, NMR, and GC-MS techniques.
研究领域:
有机化学
·
催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CELLULOSE
·
2019
·Vol. 27
·期 1
·561-573
·
IF 3.917
Ma Yue,Zou Yuting,Zhang Zhen,Fang Jiaojiao,Liu Wenting,Ni Yaru,Fang Liang,Lu Chunhua,Xu Zhongzi
Abstract Luminescent and hydrophobic textile coatings with recyclability and self-healing capability against both chemical and physical damage were prepared, which present multi-functions and long service life cycles. The applications in self-cleaning, oil-water separation, and anti-counterfeit technology were successfully demonstrated. The coatings can be easily created onto different fabrics including cotton cloth, filter paper, and chemical fabric. A rare earth organic complex of SmTTAPhen(NO 3 ) 3 (STPN), silane modified epoxy oligomer, and bis(4-maleimidophenyl)methane (BMI) provide luminescence, hydrophobicity, as well as recyclability and self-healing capability, respectively, to the coatings. More specifically, high transparency but high luminescence were achieved due to the good dispersion of STPN in coating matrix, resulting from the hydron bonding between nitrate groups from STPN and hydroxyl groups from epoxy oligomer. Silane modification facilitated the accumulation of Si–O bonds on the free-surface of the coating, which offers hydrophobic features. The introduction of reversible Diels-Alder reactions provided the self-healing capability and recyclability. Upon heating using an electronic iron, the hydrophobicity can be recovered from physical or chemical damage to the coatings. Besides, the coatings on abandoned fabrics can be recycled and reused to a new bare fabric. We believe that the concept and coating materials are useful to further expand the areas of smart and multi-functional coatings with long service life. Graphic abstract
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
INORGANIC CHEMISTRY
·
2021
·
IF 5.165
Amir Said,Chang Gao,Caiyun Liu,Huihui Niu,Dexin Wang,Yanshu Liu,Lin Du,Chen-Ho Tung,Yifeng Wang
A three-dimensional (3D) mesoporous material with an atomically precise structure, Ti16Pb5O16(C6H5CO2)2(OCH3)40 (Ti16Pb5), comprised of a novel high-nuclearity Pb-doped titanium oxide cluster (TOC), was synthesized. Ti16Pb5 exhibited a surface area of 45 m2 g–1 and a pore diameter of 3.5 nm. It exhibited an uptake capacity of I2 of ≤2.2 g g–1 in vapor, and the performance was maintained after seven uptake–release cycles. Ti16Pb5 also showed a high adsorption ratio and capacity (93% and 3.1 g g–1) in hexane. The characterization data, including Fourier transform infrared, Raman, and powder X-ray diffraction, suggested the lattice structure of Ti16Pb5 was rigid and I2 was accommodated in the pores of Ti16Pb5. To the best of our knowledge, this is the first example of using a TOC in I2 adsorption. In addition, Ti16Pb5 showed excellent activity and recyclability in visible-light degradation of dye pollutants and photocurrent generation. Our structural analysis suggested the alkoxide ligands within the channels of Ti16Pb5 build up a confined polar environment and thereby facilitate I2 accommodation, and meanwhile, the improved performances and stabilities of Ti16Pb5 are correlated with its cluster-based, 3D hierarchical structure.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 39
·24374-24381
·
IF 3.108
Sheng Wang,Sanding Wu,Jiazhang Zhang,Tao Wang
Cost-effective, scalable methods to create antiwetting fabric are in high demand for applications ranging from outerwear to water purification and oil–water separation. Conventionally, polymer reagents such as low-surface-tension fluorinated reagents and long alkyl polymers are often incorporated in anti-wetting fabrics to enable water repellency. However, because of their high stabilities and propensity for bioaccumulation, alternative methods that are cost-effective, eco-friendly, and scalable are highly desirable. Herein, we present a simple, environmentally friendly approach to fabricate fluorine-free, recyclable, self-cleaning superhydrophobic coatings. Using only one vacuum heating treatment and without any chemical modification, superhydrophilic TiO2-immobilized polyester fabrics were converted to superhydrophobic fabrics. These fabrics can be applied for oil/water separation, and the adsorbed grease can be photodecomposed quickly by photocatalysis without the use of organic detergents. On the loss of hydrophobicity, the fabric can be heated under vacuum, regenerating the superhydrophobicity.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2016
·
IF 3.698
Yi Feng,Shichang Liu,Guozhen Liu,Jianfeng Yao
Porous carbon spheres with a diameter of 1–2 cm were prepared via a simple carbonization of the fruit of Liquidambar formosana . After carbonization, the spherical structure and inner finger-like pores were maintained with high resistance to impact. Due to the porous structure and the hydrophobic nature, the carbonized fruit of Liquidambar formosana can float on the water surface and show a super-fast oil or organic solvent sorption ability (sorption saturation can be achieved within 1–2 min). Moreover, about 99% of adsorbed oil can be easily removed from spheres via organic solvent such as ethanol or hexane, which shows good recyclability of samples. In general, considering the low-cost and abundance of raw material collected from nature and the facile synthetic process (only by carbonization), the centimeter-sized porous spheres via the carbonization of fruit of Liquidambar formosana are very promising to be used for the application of oil or organic solvent spill cleanup.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 73
·46336-46343
·
IF 3.108
Chenting Cai,Yue Zhang,Xueting Zou,Rongchun Zhang,Xiaoliang Wang,Qiang Wu,Pingchuan Sun
The development of self-healing and recyclable crosslinked polymeric materials has drawn considerable attention in recent years. However, the bulk healing or remending speed is usually slow due to the high viscosity of high Mw polymers, and the low rate of thermal conduction from material surfaces into the central matrix. Herein, a rapid self-healing and recyclable high-performance crosslinked epoxy resin (ER)/graphene nanocomposite is reported by simultaneously incorporating thermally reversible Diels–Alder (DA) covalent bonds and multiple-responsive graphene into the ER matrix. Therefore, graphene in proximity to the DA crosslinkages can instantly trigger the retro-DA reactions by converting the absorbed energies (e.g. infrared light, microwave, etc.) into heat, and thus enables rapid self-healing and recycling. Furthermore, the well-dispersed graphene (<1 wt%) could significantly enhance the mechanical strength of the ER. In situ variable temperature solid-state NMR spectroscopy was used to monitor the reversible DA reactions at the molecular level, and the high healing and recycling efficiency of ER/graphene nanocomposites was well demonstrated by multiple approaches.
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
APPLIED COMPOSITE MATERIALS
·
2021
·Vol. 29
·期 2
·729-743
·
IF 2.181
Huo Yanqiu,Ge Huan,Lin Changhong,Ying Puyou,Huang Min,Zhang Ping,Yang Tao,Liu Gang,Wu Jianbo,Levchenko Vladimir
The development of polymer-based composites with self-healing and recyclable capability has attracted the attention of several researchers for resource recycling and environment protection. In this work, Halloysite nanotubes (HNTs) reinforced polyurethane materials (PU) with self-healing and recyclable ability were constructed by in situ polymerization method. The mechanical, thermal amd morphological properties of PU and related composites were studied. The morphology of samples fracture surface ensured the homogeneous dispersion of HNTs in the polymer matrix. Moreover, thermal stability was improved with the incorporation of the HNTs. The tensile test showed strength increased with HNTs content increased. The tensile strength of composites increases from 23.38 to 34.92 MPa at 2 wt% HNTs. Therefore, the designed strategy provides a simple approach for preparing high mechanical properties, reprocessing and self-healing ability polyurethane composites.
研究领域:
材料科学
·
环境科学
✓ 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）