JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
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2012
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IF 2.487
Xinlai Wei,Qiang Lu,Xianwei Sui,Zhi Wang,Ying Zhang
Water-insoluble pyrolytic cellulose with similar appearance to pyrolytic lignin was found in cellulose fast pyrolysis oil. The influence of pyrolysis temperature on pyrolytic cellulose was studied in a temperature range of 300–600 °C. The yield of the pyrolytic cellulose increased with temperature rising. The pyrolytic cellulose was characterized by various methods. The molecular weight distribution of pyrolytic cellulose was analyzed by gel permeation chromatography (GPC). Four molecular weight ranges were observed, and the M w of the pyrolytic cellulose varied from 3.4 × 10 3 to 1.93 × 10 5 g/mol. According to the elemental analysis (EA), the pyrolytic cellulose possessed higher carbon content and lower oxygen content than cellulose. Thermogravimetric analysis (TGA) indicated that the pyrolytic cellulose underwent thermo-degradation at 127–800 °C and three mass loss peaks were observed. Detected by the pyrolysis gas chromatography–mass spectrometry (Py-GC/MS), the main pyrolysis products of the pyrolytic cellulose included saccharides, ketones, acids, furans and others. Fourier transforms infrared spectroscopy (FTIR) also demonstrated that the pyrolytic cellulose had peaks assigned to C O stretching and glycosidic bond, which agreed well with the Py-GC/MS results. The pyrolytic cellulose could be a mixture of saccharides, ketones, and their derivatives.
研究领域:
生物质能
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材料化学
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产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2016
·Vol. 133
·期 39
·
IF 1.866
Jianjun Zhou,Jin Chen,Ming He,Jianfeng Yao
Cellulose nanocrystals (CNCs) were used as a sustainable additive to improve the hydrophilicity, permeability, antifouling, and mechanical properties of blend membranes. Different CNC loadings (0–1.2 wt %) in cellulose acetate (CA) membranes were studied. The blend membranes were prepared by a phase-inversion process, and their chemical structure and morphological properties were characterized by attenuated total reflectance–Fourier transform infrared spectroscopy, scanning electron microscopy, porosity, and mean pore size and contact angle measurement. The blend membranes became more porous and more interconnected after the addition of CNCs. The thickness of the top layer decreased and a few large holes in the porous substrate appeared with increasing CNC loading. In comparison with the pure CA membranes, the pure water flux of the blend membranes increased with increasing CNC loading. It reaches a maximum value of 76 L m −2 h −1 when the CNC loading was 0.5 wt %. The antifouling properties of the CA membrane were significantly improved after the addition of CNCs, and the flux recovery ratio value increased to 68% with the addition of 0.5 wt % CNCs. In comparison with that of the pure CA membranes, the tensile strength of the composite membranes increased by 47%. This study demonstrated the importance of using sustainable CNCs to achieve great improvements in the physical and chemical performance of CA ultrafiltration membranes and provided an efficient method for preparing high-performance membranes. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133 , 43946.
研究领域:
材料科学
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环境工程
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产品关联
DOI
高影响因子
CELLULOSE
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2020
·Vol. 28
·期 2
·691-701
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IF 4.21
Wang Ruochun,Rong Liduo,Ni Shujing,Wang Qiankun,Wang Bijia,Mao Zhiping,Feng Xueling,Yuan Jinying,Sui Xiaofeng
A novel approach was developed to prepare cellulose acetoacetate- graft -copolymers via horseradish peroxidase (HRP)-mediated polymerization. Cellulose acetoacetate (CAA), the macroinitiator, was obtained by transesterification between tert -butyl acetoacetate ( t -BAA) and cellulose in ionic liquid. The CAA- graft -polyacrylamide (CAA- g -PAM) was synthesized using a ternary initiator system consisting of CAA, HRP and hydrogen peroxide (H 2 O 2 ). The results of surface-initiated polymerization showed that the formation of free polymers could be inhibited in this process. The kinetics exhibited that this method is a powerful tool for obtaining graft copolymers. The effects of H 2 O 2 concentration and reaction temperature were investigated to explore the optimal conditions for the process of enzymatic initiation. The synthesized copolymers were characterized by FT IR, NMR, TGA and elemental analysis to confirm the successful grafting of polyacrylamide chains onto the cellulose backbones. Furthermore, generality of the HRP-mediated graft polymerization approach was demonstrated using various monomers, including 2-hydroxyethyl methacrylate (HEMA), methyl methacrylate (MMA) and sulfobetaine methacrylate (SBMA). This efficient and robust strategy has great potential in fabrication of cellulose-based functional polymers. Graphic abstract Enzymatic grafting polymerization from cellulose acetoacetate
研究领域:
材料科学
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生物化学
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DOI
高影响因子
CELLULOSE
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2017
·Vol. 24
·期 5
·2049-2057
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IF 3.417
Su Xiuxia,Zhang Yi,Zhao Dongdong,Chen Zhuo
With cellulose acetate (CA) as a base material, a novel environmentally friendly carboxylate waterborne cellulose acetate (CWCA) emulsion was synthesized via the method of self-emulsification. Taking advantage of acrylic acid, hydroxyethyl acrylate as a modifier, and isophorone diisocyanate as a bridging agent, the molecular structural design of CWCA dispersion was completed successfully, and the structure was confirmed by Fourier transform infrared spectroscopy (FTIR). In this work, the particle size and distribution of the stable CWCA dispersion with solid content of 22.6% are 115.6 and 0.158 nm, respectively. It was found that the microstructure of emulsion particles is a core-shell structure containing a hydrophilic carboxylate group as the shell and hydrophobic cellulose acetate molecular as the core. In addition, the hydrophobic behavior of CWCA film is presented as a contact angle of 109.9°. Furthermore, CWCA film provided a higher thermal decomposition temperature of 345.42 °C than that of CA film at the largest mass loss rate.
研究领域:
材料科学
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高分子化学
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DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
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2024
·
IF 5.6
Chunjie Wei,Fangyong Yu,Yujiao Xie,Feipeng Wang,Feng Song,Yuan Zhang,Hongzi Tan,Hongyou Cui
The functional and environmentally friendly materials derived from cellulose have attracted increasing attention due to their extensive application. In this work, a new approach for preparation of carboxymethyl cellulose (CMC) films by adjusting the structure of cellulose with molten salt hydrates (MSHs) was proposed. The dissolving ability of cellulose in single and mixed MSHs was studied, and the structure of regenerated cellulose was characterized. The mechanism of cellulose dissolution and regeneration revealed that cellulose regenerated from mixed MSH (LiCl–2ZnCl 2 –6H 2 O) was conducive to derivatization. CMC films were synthesized from regenerated cellulose, and their structure–property relationships were investigated. CMC films with good mechanical strength and transmittance and CMC-H films with water resistance and flexibility were successfully prepared, illustrating that adjusting cellulose structure by using MSHs is an effective strategy for developing multifunctional CMC films.
研究领域:
材料科学
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环境科学
·
化学工程
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产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
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2024
·
IF 10.7
Yuhui Ci,Dong Lv,Xiangjian Yang,Haishun Du,Yanjun Tang
Strong interfacial adhesion between cellulose and other polymers is critical to achieve the properties required for specific applications in composite materials. Here, we developed a method for the simultaneous homogeneous dissolution of cellulose and thermoplastic polyurethane (TPU) in 1,8-diazabicyclo (5.4.0) undec-7-ene levulinate/dimethyl sulfoxide ([DBUH]Lev/DMSO) solvent. This process is essential for preparing cellulose/TPU composite films and fibers through interaction-modulated cellulose regeneration. Both cellulose and TPU can be easily dissolved together in [DBUH]Lev/DMSO solvent under mild conditions. The resulting cellulose/TPU solutions exhibited strong temperature sensitivity, shear-thinning behavior and viscoelasticity, making them suitable for cast films and continuous spinning. More importantly, research findings, including density functional theory calculations and experimental characterization, confirmed the high compatibility and interaction modulability of cellulose and TPU in the composite films. The representative C90T10 sample (cellulose/TPU, 90/10) showed high transparency (90 % at 800 nm) and excellent mechanical properties (tensile strength: 176 MPa; elongation at break: 8.1 %). Additionally, the maximum tensile strength and elongation at the break of the composite fiber from C90T10 were 214 MPa and 48.1 %, respectively. This method may provide a feasible approach to design and produce homogeneous environmentally friendly composites of cellulose and other polymers at the molecular level.
研究领域:
材料科学
·
高分子化学
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产品关联
DOI
PubMed
高影响因子
CARBOHYDRATE POLYMERS
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2019
·
IF 6.044
Liduo Rong,Min Zeng,Hongchen Liu,Bijia Wang,Zhiping Mao,Hong Xu,Linping Zhang,Yi Zhong,Jinying Yuan,Xiaofeng Sui
The Biginelli multicomponent reaction has been used as an effective and model method to efficiently prepare a library of cellulose derivatives based on cellulose acetoacetate (CAA). Various cellulose derivatives containing 3, 4-dihydropyrimidin-2(1 H )-ones (DHPMs) with different functional groups (carboxyl, methoxyl, and nitro) are synthesized. The entire reaction process is followed using FT-IR, 1 H NMR. The results demonstrate that more than 80% of the acetoacetyl groups are converted within four hours. Additionally, all the cellulose derivatives are confirmed to have favorable thermostability and good solubility in selected solvents. Furthermore, polymers (in this case, poly (ethylene glycol) monomethyl ether (mPEG)) can also be anchored to the cellulose backbone via this facile modular approach. Therefore, the Biginelli multicomponent reaction offers a straightforward method for diverse and large-scale cellulose derivatization. These results are expected to prompt broader study of this multicomponent reaction in interdisciplinary fields.
研究领域:
材料科学
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有机化学
✓ 已验证
DOI
高影响因子
CARBOHYDRATE POLYMERS
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2017
·
IF 4.811
Xi Chen,Nan Zheng,Qiao Wang,Lingzhi Liu,Yongfeng Men
The differences in side chain crystallization behavior between cellulose esters (CEs) and hydroxypropyl cellulose esters (HPCEs) were systematically investigated by a combination of differential scanning calorimetry (DSC) and small and wide-angle X-ray scattering techniques. DSC investigation indicated that under the same side chain length, the fusion enthalpy and the number of crystallized CH 2 of CEs were smaller than HPCEs. At the same time, their d-spacing and molecular arrangements were also different from each other. For the CEs, the side chains are perpendicular to the main chain, while the side chains most probably tend to tilt to main chain in the HPCEs as was evidenced by X-ray scattering results. The phenomenon can be understood as a consequence of different flexibility of attachment bridges in both kinds of side chain polymers and the steric hindrance of methyl group in the hydroxypropyl group in HPCEs. In addition, the added hydroxypropyl substituents make the side chain length increasing.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
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2015
·
IF 2.711
Jiapeng Fu,Zengyuan Pang,Jie Yang,Fenglin Huang,Yibing Cai,Qufu Wei
We report a facile approach to synthesizing and immobilizing polyaniline nanorods onto carboxymethyl cellulose (CMC)-modified cellulose nanofibers for their biosensing application. Firstly, the hierarchical PANI/CMC/cellulose nanofibers were fabricated by in situ polymerization of aniline on the CMC-modified cellulose nanofiber. Subsequently, the PANI/CMC/cellulose nanofibrous mat modified with laccase (Lac) was used as biosensor substrate material for the detection of catechol. PANI/CMC/cellulose nanofibers with highly conductive and three dimensional nanostructure were characterized by scanning electron microscopy (SEM), transmission electron microscope (TEM), Fourier transform infrared spectra (FT-IR), cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). Under optimum conditions, the Lac/PANI/CMC/cellulose/glassy carbon electrode (GCE) exhibited a fast response time (within 8 s), a linear response range from 0.497 μM to 2.27 mM with a high sensitivity and low detection limit of 0.374 μM (3 σ ). The developed biosensor also displayed good repeatability, reproducibility as well as selectivity. The results indicated that the composite mat has potential application in enzyme biosensors.
研究领域:
材料科学
·
生物医学工程
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2026
·
IF 8.7
Qian Zhang,Zitian Ding,Yan Li,Xin Wang,Jintian Huang
Various cellulose materials have broad application prospects in various fields. However, the functionality of single-component cellulose is limited. When composited with functional particles, aggregation caused by interactions between the reinforcements and matrix leads to defects in the composite material. This study proposes a synergistic approach that combines intrinsic and extrinsic methods. This strategy fully leverages the fibrous and spherical morphologies of cellulose as well as its Type I and II crystalline structures. A class of single-component cellulose composites is prepared using a multiphase, multimorphology, and multiscale interfacial-engineering strategy. This strategy involves the synergistic interaction and restructuring of two distinct nano-units that differ in dimensionality and chemical properties. Each functional aspect of the cellulose types can serve as a “functional unit” or “structural regulator,” creating complementary enhancement effects. Compared with conventional and biodegradable plastics, these materials exhibit superior properties, such as enhanced soil degradability. These materials have emerged as promising candidates for applications in numerous fields.
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产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Pengyu Pan,Yuanyuan Liu,Zhishuang Zhu,Yang Liu,Renzhong Wei,Qiang Wang,Qingxian Miao,Yilian Lei,Chengshui Guo,Hongjie Zhang,Liulian Huang,Lihui Chen,Jianguo Li
Hydroxypropyl cellulose (HPC) is a green thermochromic material in energy-saving buildings, anti-counterfeiting, and data security fields. However, the high lower critical solution temperature (LCST) of HPC, around 42 °C (higher than the human thermal comfort temperature), limits its thermochromic sensitivity, poor stability, and short lifespan. Herein, we developed a durable, high-performance cellulose-based thermochromic composite with a lower LCST and easy preparation capability by combining HPC with sodium carboxymethyl cellulose (CMC). In such thermochromic cellulose, CMC constructs a hydrophilic skeleton to enable uniform dispersion of HPC, and functions as a stronger competitor to attract the water molecules compared to HPC, both of which trigger high thermochromic sensitivity and low LCST (just 32.5 °C) of our CMC/HPC. In addition, CMC/HPC shows superior stability, such as 100-day working capability and 60-time recyclability. This advancement marks a significant step forward in creating sustainable, efficient thermochromic materials, offering new opportunities for energy conservation in the building.
研究领域:
材料科学
·
能源与建筑
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2022
·
IF 3.898
Zhongxin Lin,Renliang Huang,Jiangjiexing Wu,Anastasia Penkova,Wei Qi,Zhimin He,Rongxin Su
With excellent biocompatibility and unique physiochemical properties, nanocelluloses including cellulose nanocrystals (CNCs) and cellulose nanofibrils (CNFs) are promising candidates for preparing biomedical hydrogels. CNCs and CNFs are different in morphology and surface charges. Herein, CNCs and two CNFs (CNFs-C, Carboxylated CNFs; CNFs-P, Phosphorylated CNFs) were synthesized and applied to fabricate hydrogels through metal crosslinking. Aluminum crosslinking was found to be the best choice for enhancing the strength. This study systematically compared the morphologies, storage modulus, loss factor, continuous shear ramp, self-healing, swelling, in vitro degradation and injectable properties of the fabricated hydrogels. Further, a radar chart is summarized as guidelines to direct the rational selection to meet the specific requirements of further biomedical applications. At the same nanocellulose concentration and after Al 3+ crosslinking, CNCs hydrogels had strong water holding capacity twice as much as that of CNFs hydrogels. While CNFs hydrogels showed higher hardness and stronger resistance to degradation than that of CNCs. These results provide detailed insights into nanocellulose hydrogels, making it possible to use these guidelines to select hydrogels for desired performance.
研究领域:
生物材料学
·
医学工程
·
高分子科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）