COMPOSITES SCIENCE AND TECHNOLOGY
·
2021
·
IF 8.528
Jiayao Yang,Hengxu Wang,Xiaohuan Liu,Shenyuan Fu,Pingan Song
The intrinsic brittleness has significantly restricted practical applications of epoxy resins. Existing toughening strategies often lead to degraded mechanical strength . Hence, it has been attractive but a huge challenge to design high-performance sustainable additives that can simultaneously improve strength and toughness of epoxy resins. Here, we report the synthesis of a nano-TiO 2 /regenerate cellulose (RC) biohybrid via a facile microwave method for strengthening and toughening a soft epoxy resin system (modulus below 1 GPa). Our results show that with 10 phr nano-TiO 2 /RC, the resultant epoxy composite exhibits simultaneous enhancements in tensile strength and impact toughness , ca. 38% and 40% higher than corresponding values of virgin epoxy resin because of improved interfacial compatibility. Moreover, the addition of as-designed nano-TiO 2 /RC can enhance thermostability of epoxy resin. It has a slightly negative effect on the curing reaction but does not change the curing mechanism of epoxy resins. This study provides a facile, efficient and green method for preparing bifunctional additive for creating strong and tough epoxy composites, which are expected to find wider applications in industries.
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
CARBOHYDRATE POLYMERS
·
2019
·
IF 6.044
Ying Qiao,Chengkai Zhai,Fei Liu,Lai Chen,Haining Na,Jing Chen,Jin Zhu
Following the main idea of a two-step method, microcrystalline cellulose is firstly pretreated to prepare regenerated cellulose (RC) with low crystallinity. Then, RC is continuously hydrolyzed to sugar in aqueous system by microwave driving. With the establishment of ZrO 2 contained low acid catalytic system, an advanced route driven by microwave radiation to induce highly efficient hydrolysis of RC to sugar is formed. Due to the effect of ZrO 2 on the molecular chain of cellulose, the recrystallization of RC is obviously weakened, and higher hydrolysis reactivity is achieved. Under the optimal conditions, the average conversion of RC and the yield of total reducing sugar highly reach 98.4 ± 0.5% and 97.9 ± 0.6%, respectively. The result is extremely superior to the efficiency of hydrolysis initiated only by pure acid. As a result, a novel and simple thinking to establish an advanced two-step methodology to hydrolyze cellulose to sugar with high efficiency is achieved.
研究领域:
生物化学
·
可再生能源
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Coatings
·
2022
·Vol. 12
·期 12
·1823
·
IF 3.236
Rengui Weng,Feng Tian,Xin Huang,Guohong Chen
In this study, by adding zirconium anhydride (ZrO2) particles to a solution ofN–methylmorphorphine–N–oxide (NMMO) and bamboo cellulose (BC), we used interfacial polymerization (IP) to obtain regenerated cellulose nanofiltration membranes (IP–ZrO2/BC–NFMs) that exhibited high water flow and rejection of salts and dyes. During interfacial polymerization, anhydrous piperazine (PIP) was used as the waterborne monomer, and 1,3,5–trimesoyl chloride (TMC) and n–hexane were used as the organic phase. The procedure was adjusted by analyzing the impacts of the concentrations of the water and organic phase monomers and the reaction duration on the performance of the developed IP–ZrO2/BC–NFMs. The chemical structures and morphologies of the as–obtained IP–ZrO2/BC–NFMs were examined using various characterization techniques. The performance of these membranes for removal of inorganic salts and dyes as well as their water flow were investigated. IP–ZrO2/BC–NFMs obtained at a pressure of 0.5 MPa, PIP concentration of 1.5 wt.%, TMC concentration of 0.15 wt.%, and polymerization period of 2 min displayed the highest water flux (55.12 LMH) and the best desalination effect (NaCl rejection rate = 19.15%). Over 90% of both Methyl Blue (MB) and Congo Red (CR) dyes were intercepted. We demonstrated that the addition of ZrO2to nanofiltration membranes significantly enhanced the water flow of the IP–ZrO2/BC–NFMs as well as the salt ion rejection rate.Keywords:regenerated cellulose;nanofiltration membrane;rejection rate;interfacial polymerization
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2022
·
IF 6.14
Boshi Yu,Zhenyu Zhang,Wei Liu,Fei Liu,Juncheng Huang,Haining Na,Jin Zhu
A hydroxyl-enriched core/shell structured carbon nanotube (CNT/C-OH) is prepared by the method of hydrothermal carbonization (HTC) as a catalytic accelerator to induce highly efficient hydrolysis of regenerated cellulose to glucose. By use of sonication with high sound intensity, the carbon source (namely glucose) is homogeneously dispersed with CNT to form a colloid. Accordingly, a high-quality CNT/C-OH with a hydroxyl-enriched coating layer is produced in the following HTC. The oxygen mass content of the shell is up to 16.38%. A great deal of hydroxyl groups contribute to the CNT/C-OH having a strong affinity to adsorb with the regenerated cellulose and thus to enhance its hydrolytic ability to convert to sugar. In a low-acid aqueous system with CNT/C-OH, the cellulose conversion and the glucose yield reach 94.62 and 78.82%, respectively. A good reusability of CNT/C-OH is also found in multiple steps of hydrolysis of the regenerated cellulose to sugar.
研究领域:
材料科学
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催化化学
·
生物质转化
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Mengyao Han,Cuiling Wu,Jingyu Song,Lushun Yang,Ting Zhang,Yajie Chou,Xueyan Du
With the proliferation of electronic devices and wireless technologies, Electromagnetic Interference (EMI) has become a critical global concern. Correspondingly, the development of efficient EMI shielding materials with strong electromagnetic wave absorption and reflection is imperative. This study presents the fabrication of sandwich-structured composite films (SCFs) utilizing regenerated cellulose (RC) as the matrix, incorporating Ti 3 C 2 T x MXene and Fe 3 O 4 nanoparticles (Fe 3 O 4 NPs) as functional fillers. The SCFs (MXene/RC-Fe 3 O 4 /RC-MXene/RC) were fabricated using an immersion phase conversion method followed by mechanical pressing techniques. The resulting SCFs exhibit a conductivity of 23.8 S/m and a maximum EMI shielding effectiveness (SE) of 32.52 dB. This performance is attributed to the innovative sandwich architecture, which employs a “reflection-absorption-reflection” mechanism to attenuate electromagnetic waves. In addition, MXene is effectively dispersed in the cellulose matrix, enhancing the mechanical properties of the composite films. Notably, increasing the MXene content from 10 wt% to 40 wt% resulted in a tensile strength increase from 9.42 MPa to 17.10 MPa. This research elucidates a robust and scalable approach for the development of advanced electromagnetic shielding materials.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2023
·
IF 5.9
Bo Wang,Kai Li,Cheng-bo Zhang,Ting Huang,Ti-peng Wang,Qiang Lu
A series of regenerated cellulose (RC) were prepared by a H 3 PO 4 -H 2 O system with different H 3 PO 4 concentrations. The effects of H 3 PO 4 concentrations on the physicochemical properties of RCs were studied, including crystallinity index (CrI), hydrogen bond energy (E H ), accessibility, and degree of polymerization (DP). The catalytic pyrolysis experiments of RCs were executed with a pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS) instrument and a lab-scale device, to investigate the regulatory function of cellulose structure on the LGO formation. The results indicated that the H 3 PO 4 -H 2 O system could transform the cellulose crystal form from Ⅰ to amorphous form, reduce its CrI and E H significantly, improve its accessibility, while had slight effects on the DP. These changes made RC more appropriate for the selective preparation of LGO, and the corresponding optimal catalyst loading and pyrolytic temperature were also decreased significantly. With phosphoric acid activated carbon as the catalyst, the highest yield of LGO from RC in Py-GC/MS experiments reached 21.50 wt% at catalyst/cellulose (Cat/Cel) ratio of 1/5 and 270 °C, which was much higher than the 18.16 wt% of LGO gained from untreated cellulose at Cat/Cel ratio of 1/3 and 300 °C. In the lab-scale device, the maximum LGO yield from RC was 17.09 wt% at 270 °C and Cat/Cel ratio of 1/6.
研究领域:
生物质能
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化学工程
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
CELLULOSE
·
2020
·Vol. 27
·期 15
·8667-8679
·
IF 4.21
Hou De-Fa,Tan Huang,Li Meng-Lei,Tang Yue,Liu Zheng-Ying,Yang Wei,Yang Ming-Bo
Due to the fact that natural cellulose cannot be melted, it is still challenging to process this biopolymer via thermoplastic processing methods. Herein, polycaprolactone diol was grafted onto regenerated cellulose (RC) via hydroxyl/isocyanate chemistry in dimethyl sulfoxide to endow cellulose with thermoplasticity. By adjusting the reaction parameters including the feeding ratios of reactants and reaction time, several homogeneous cellulose grafted polyurethanes (RC-g-PU) with the degree of substitution (DS) ranging from 0.49 to 1.48 and degree of polymerization ranging from 1.84 to 3.3 were synthesized. The thermoplasticity of the obtained RC-g-PU was well characterized by differential scanning calorimetry and optical microscope. The results revealed that the prepared RC-g-PU with DS values ranging from 1.01 to 1.48 can be melted at above 168.4 °C because PU side chains can serve as internal plasticizers and prevent the restacking of cellulose chains. Eventually, the synthesized thermoplastic RC-g-PU can be processed into transparent films by hot-pressing at 170 °C. Therefore, this research constructs a melt-processable cellulose derivative by a simple and engineering method.
研究领域:
材料科学
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生物高分子化学
✓ 已验证
DOI
高影响因子
POLYMER
·
2020
·
IF 4.231
Tao Shi,Yun Lu
As one of the most abundant renewable and biodegradable materials in nature, cellulose is difficult to dissolve in common organic and inorganic liquids. Here, a series of regenerated cellulose films were prepared by using a specific tetra-butylammonium hydroxide TBAH/H 2 O/DMSO ternary solvent system. Especially, the fluorescent cellulose film was obtained successfully via a ring-opening grafting reaction between a modified fluorescein molecule with 3-expoxypropoxy and cellulose. The fluorescent cellulose films exhibited excellent fluorescence stability and pH sensitivity to the aqueous solutions with different degree of acid and alkaline. Moreover, the anisotropic fluorescein cellulose film was obtained for the first time by stretching and further drying the initial fluorescence cellulose hydrogel, and displayed a novel polarized emission. This work provided a simple, low-cost and environment-friendly pathway to fabricate fluorescent cellulose films, showing potential applications in packaging, decoration materials and other functional materials such as anti-counterfeiting paper.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2013
·
IF 2.906
Xuejuan Jia,Yingwen Chen,Chong Shi,Yangfan Ye,Peng Wang,Xiaoxiong Zeng,Tao Wu
Native cellulose has a highly crystalline structure stabilized by a strong intra- and intermolecular hydrogen-bond network. It is usually not considered as a good gelling material and emulsion stabilizer due to its insolubility in water. Chemical modification is generally necessary to obtain cellulose derivatives for these applications. In this study, we have shown that, by simply disrupting the hydrogen-bond network of cellulose with phosphoric acid treatment, the regenerated cellulose can be a good gelling material and emulsion stabilizer. Microscopy, X-ray diffraction, and Fourier transform infrared spectroscopy analysis have confirmed that the regenerated cellulose is primarily amorphous with low crystallinity in the structure of cellulose II. Stable aqueous suspensions and opaque gels that resist flowing can be obtained with the regenerated cellulose at concentrations higher than 0.6% and 1.6%, respectively. Moreover, it can effectively stabilize oil-in-water emulsions at concentrations less than 1% by a mechanism that combines network and Pickering stabilization.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FIBERS AND POLYMERS
·
2023
·Vol. 24
·期 3
·885-892
·
IF 2.5
Du Qiuping,Yu Jiajing,Xu Xianlin,Xia Lei,Zhuang Xupin
Developing a reusable, low cost and biodegradable oil absorption material with high capacity remains a challenge. Herein, we demonstrate a facile and reliable methodology to construct a hydrophobic cellulose sponge from cellulose xanthate by regenerating cellulose and surface silanization using methyl trichlorosilane. The cellulose sponge presents high porosity of up to 87.46% which could be regulated with p-Toluenesulfonyl hydrazide. The sponge exhibits excellent structure stability, which could complete recovery from 90% compression strain and high durability (60 cycles at 90% stain). With a hydrophobic surface, it presents a high absorption capacity of over 30 times its weight for oils and organic solvents, indicating promising application in oil and water separation.
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
CELLULOSE
·
2022
·Vol. 29
·期 8
·4439-4453
·
IF 6.123
Li Yinan,Li Huixin,Huang Jin,Huang Liulian,Chen Lihui,Ni Yonghao,Zheng Qinghong
A highly transparent ZnO/cellulose composite membrane with UV sensing and shielding abilities was prepared via a facile blending method. ZnO nanoparticles (ZnO NPs) without additional surface modification are uniformly dispersed in the regenerated cellulose (RGC) matrix through the N-methyl-morpholine-N-oxide (NMMO) dissolution of cellulose. Agglomeration of the ZnO NPs is effectively minimized, thanks to the strong hydrogen bonds between ZnO NP and cellulose. The optimized ZnO/RGC membrane exhibits not only high a shielding ratio of 97.67 ± 0.11% for UV lights (< 360 nm) but also high transparency of 87.12±1.55% in the visible light region, which is comparable to traditional plastic products. Benefiting from the high photoelectric performance of ZnO NPs, a UV sensor and a UV blocker were integrated into the same device. The as-fabricated ZnO/RGC membrane, with sensitive UV detecting and effective blocking, as well as the rich availability of cellulose as raw material and its biodegradable nature, is an ideal candidate for high-performance UV detection and protection applications. Graphical abstract
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2020
·
IF 4.244
Xin Gao,Meng Li,Heng Zhang,Xiaoning Tang,Keli Chen
In this study, regenerated cellulose (RC) thin films were obtained using parenchyma cellulose from large clustered bamboos which were endemic to Xishuangbanna area in Yunnan province, China. The bamboo parenchyma cells were separated from their low-temperature (140 ℃ of the maximum temperature) kraft pulps through multi-screening. The cellulose was dissolved in N,N -dimethyl acetamide (DMAc) solvent with LiCl amount from 6 % to 10 %, then regenerated in the glycerol-water solution. X-ray diffraction analysis indicated the crystalline forms of RC films were transited from cellulose I to cellulose II. TGA analysis suggested that lower LiCl usage take an advantage on the higher thermal stability of the RC films. The DMAc-related solvent with a relatively lower LiCl dosage displayed a stronger capacity of cellulose dissolution, shed light on its considerable industrial application prospects and facilitated the high value-added utilization of waste biomass resources.
研究领域:
材料科学
·
生物质资源利用
✓ 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）