INDUSTRIAL CROPS AND PRODUCTS
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2022
·
IF 6.449
Chunxiao Gong,Xianzhi Meng,Caidi Jin,Ming Yang,Jianglong Liu,Kuichuan Sheng,Yunqiao Pu,Arthur Ragauskas,Guanya Ji,Ximing Zhang
5-hydroxymethylfurfural (HMF) production from cellulose is a hot topic, while the rigidity of cellulose limits its efficient conversion into HMF. Cellulose formate has exhibited the great potential for HMF production but it’s synthesis via direct formylation of cellulose in formic acid is difficult. Herein, we reported a green synthetic route of cellulose formate and its efficient conversion into HMF. Ball milled cellulose formate (BCF) was synthesized via ball milling followed by formylation in formic acid at 80 °C for 0.5 h. The structure of BCF was thoroughly characterized and BCF was subsequently converted to HMF catalyzed by AlCl 3 and HCl in dimethyl sulfoxide (DMSO)-H 2 O media. Results showed that ball milling of cellulose for 1–1.5 h efficiently deconstructed its crystallinity and degree of polymerization, boosting its further formylation and catalytic conversion. An overall 66.9% HMF yield from cellulose was achieved at 150 °C for 20 min using BCF derived from cellulose ball milled for 1.5 h as the substrate. BCF exhibits high reactivity toward HMF due to its excellent solubility and accessibility in DMSO-H 2 O media, and the release of formic acid in reaction further facilitates HMF production. BCF synthesized with different ball milling times shows different degrees of substitution of formyl groups, which could serve as an indicator and regulate the HMF production. The green synthesis of cellulose formate creates an efficient pathway for HMF production.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2023
·
IF 8.2
Junqing Chen,Zhaodong Zhu,Hui Zhang,Shiyu Fu
Biomass-based multifunctional electromagnetic shielding materials have attracted extensive interest in academia and industry due to the sustainability of biomass and the environmental adaptability of multifunctional materials. After removing lignin and hemicellulose wood become a porous substrate with aligned cellulose , which is a good platform for building cellulose-based materials. In this work, a cellulose composite with sandwich-like structure was constructed by in-situ polymerization of aniline on delignified wood and coating a PDMS/CNT layer. Benefiting from the natural porous hierarchical structure and the constructed multilayer continuous conductive network, the PDMS/CNT/PANI WA exhibits excellent electrical conductivity (18.6 S/m) and electromagnetic shielding performance (shielding efficiency value of 26 dB at the X band (8.2–12.4 GHz)). The synergistic effect of PANI and CNT endowed the material with excellent flame retardancy (HRR, THR and HRC decreased by 84 %, 53.4 % and 83.3 %) and significant antibacterial activity . Moreover, PDMS imparts a water contact angle of 105° to the material, which acts as a protective layer, further improves the durability of the material. This work provides a new strategy for developing sustainable and multifunctional electromagnetic shielding materials.
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高影响因子
Coatings
·
2023
·Vol. 13
·期 2
·443
·
IF 3.4
Peng Tian,Meirong Shi,Jingmin Hou,Peng Fu
Paper artifacts have unique cultural and historical values. However, over time, many paper artifacts appear with disease characteristics such as embrittlement and photoaging, losing the most fundamental function of the literature archive. The reinforcement handling of degraded paper artifacts is, therefore, a necessary measure to extend their service life, the key to which lies in the reinforcement and prevention of photoaging. This paper intended to use graphene oxide (GO) as a UV protective agent, carboxymethyl cellulose (CMC) as a reinforcement, and polyethyleneimine (PEI) as a modifier. In this work, the amino-modified graphene oxide carboxymethyl cellulose composite (CMC-aGO) was prepared by chemical modification, which was used as bifunctional paper protection material with anti-ultraviolet and reinforcement. It showed excellent performance in both tensile strength testing and UV resistance testing. The CMC-aGO raw material is low cost, colorless, transparent, simple to synthesize, convenient to operate, and is an excellent conservation material with dual functions of UV aging protection and paper reinforcement.Keywords:graphene oxide;carboxymethyl cellulose;UV aging protection;paper reinforcement
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JOURNAL OF APPLIED POLYMER SCIENCE
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2023
·Vol. 140
·期 15
·e53716
·
IF 3
Cai-xia Yang,Jun Li,Yu-qing Zhang,Chao Wu,De-qiang Li
Efficient utilization of pesticides has presented various advantages in the ecological environment, food safety, and agricultural sustainability. Pesticide microcapsule could significantly improve the pesticide utilization ratio, and thus, we prepared a sustained-release microcapsule from cellulose nanocrystal (CNCs) stabilized Pickering emulsion template. The NaCl was added to overcome the strong electrostatic repulsion among CNCs for forming a stable oil-in-water (O/W) CNCs-based Pickering emulsion template, followed by crosslinking with hexamethylene diisocyanate on the interface. UV–vis and zeta-potential were used to characterize the as-prepared Pickering emulsion, and the stability and emulsion fraction were calculated. Results indicated that NaCl contributed to the stability of Pickering emulsion, even at a low concentration. The obtained CNCs-based microcapsule was characterized by FT-IR, XRD, SEM, TG-DTG, and three-phase contact angles. The microcapsule presented an encapsulation efficiency of 96.76% and sustained release of the imidacloprid for more than 82 h. Results indicated the potential for loading and sustained release of imidacloprid, which is beneficial to the environment, food, and agriculture.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Chengliang Duan,Bin Wang,Jinpeng Li,Jun Xu,Jinsong Zeng,Guangdong Ying,Kefu Chen
Structural color is an eye-catching phenomenon in nature, which originates from the synergistic effect of cholesteric structure inside living organisms and light. However, biomimetic design and green construction of dynamically tunable structural color materials have been a great challenge in the field of photonic manufacturing. In this work, the new ability of L-lactic acid (LLA) to multi-dimensionally modulate the cholesteric structures constructed from cellulose nanocrystals (CNC) is revealed for the first time. By studying the molecular-scale hydrogen bonding mechanism, a novel strategy that electrostatic repulsion and hydrogen bonding forces jointly drive the uniform arrangement of cholesteric structures is proposed. Due to the flexible tunability and uniform alignment of the CNC cholesteric structure, different encoded messages were developed in the CNC/LLA (CL) pattern. Under different viewing conditions, the recognition information of different digits will continue to reversibly and rapidly switch until the cholesteric structure is destroyed. In addition, the LLA molecules facilitated the more sensitive response of the CL film to the humidity environment, making it exhibit reversible and tunable structural colors under different humidity. These excellent properties provide more possibilities for the application of CL materials in the fields of multi-dimensional display, anti-counterfeiting encryption, and environmental monitoring.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2023
·
IF 4.2
Chang Su,Jianfang Guo,Jue Cheng,Junying Zhang,Feng Gao
Microcrystalline cellulose (MCC) is regarded as a potential filler in the fabrication of epoxy composites. However, MCC’s hydrophilic nature and strong hydrogen bonds caused by abundant surface hydroxyl groups greatly weaken its compatibility with the epoxy resin. In addition, it remains a challenge to efficiently and heterogeneously modify MCC surface hydroxyl groups. In this work, MCC was epoxidized heterogeneously with a phase-transfer catalyst. Results indicated that 4.48% (by mass) or 58.15% (by coverage) of the hydroxyl groups on MCC was modified. The dispersibility of epoxidized MCC (EP-MCC) in the epoxy resin was significantly improved. At the same time, EP-MCC showed the ability to interact with the epoxy network covalently, improving the interface interactions, indicating the simultaneous enhancement of the modulus and the toughness. As a result, this heterogenous epoxidation method showed high efficiency in reducing the surface hydroxyl content of MCC, endowing it with a bright future in industrial applications of epoxy composites.
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CARBOHYDRATE POLYMERS
·
2022
·
IF 10.723
Yi Sun,Wei Zhang,Shan Lu,Wenhua Miao,Meiling Chen,Fei Liu,Haining Na,Jin Zhu
Herein, a novel cellulose-based fluorescent material with amine-responsive property was developed in a CO 2 switchable solvent for the contactless, real-time, and visual monitoring of the freshness of shrimp , crab, and fish. A nucleophilic cellulose carbonate intermediate is in-situ formed upon dissolution of cellulose in the CO 2 switchable solvent, which is adopted for the highly effective grafting of poly( l -lactic acid) and amine-responsive fluorescent reagent 7-amino-4-(trifluoromethyl) coumarin onto the cellulose backbone via ring opening polymerization and nucleophilic substitution reaction, respectively. The product has good processibility, and sensitive and reversible fluorescent responsive towards ammonia. The fluorescent intensity of the material decreased significantly and its fluorescent color changed from blue to cyan, when the aquatic products got spoiled. This study indicates that the CO 2 switchable solvent has great potential for the modification of cellulose with various functionality by taking advantage of the highly active nucleophilic cellulose carbonate intermediate.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2022
·
IF 8.025
Sikai Chen,Dong Li,Fei Song,Xiu-Li Wang,Yu-Zhong Wang
One-component nanocomposites based on poly(methyl methacrylate)(PMMA) and polystyrene (PS) grafted cellulose nanofiber (CNF) with high polymer graft percentage were fabricated. At relative ambient conditions, less active vinyl monomer, MMA, and styrene were grafted from CNF via surface-initiated Cu(0)-mediated reversible deactivation radical polymerizations (RDRP), and PMMA/PS grafted CNFs could reach a graft percentage as high as 7550 % and 3530 %, respectively. The one-component composite films were manufactured by simple hot-pressing subsequentially. Optical transparency, thermal stability, and glass transition temperature of one-component nanocomposites were enhanced dramatically in contrast with the bicomponent nanocomposite. The uniform fracture surface confirmed the uniform dispersity by morphological observation. Mechanical tests indicated that break elongation and tensile strength ascended notably, and tensile modulus slightly descended as the graft percentage increased for PS and PMMA grafted CNF one-component composite. It was concluded that for glassy graft chains, obtaining one-component nanocomposites with high enough graft chain length was essential to achieve moderated mechanical performance without compromising optical properties and thermal manufacturing ability.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Shu Xie,Tianwei Dai,Fei Li,Fengyi Liu,Quanqing Xu,Aixin Zhu,Xufeng Zhang
Hybrid hydrogels containing biomacromolecules have been widely used in sensors, fluorescent probes , and other fields due to their high biocompatibility and nontoxicity. In this paper, tough hydrogels with interconnected macro-pores have been fabricated by freeze-induced chemical cross-linking of microfibrillated cellulose (MFC) and organic modified chitosan (CS). In this hydrogel materials, three-dimensional networks were formed by abundant hydrogen bonds and chemical cross-linking. Luminescent lanthanide complexes were covalently bonded to the hydrogel networks through coordination of Eu 3+ ions with 2, 3-pyridine dicarboxylic acid modified chitosan. The luminescence of hydrogel materials was further improved by the replacement of coordination water with 2-thiophenyltrifluoroacetone (TTA). The prepared hydrogels showed excellent shape memory properties both under water and in air. The stress of the hybrid hydrogel at 80 % strain can reach 159 kPa, which is much higher than that of the traditional microfibrillated cellulose-based hydrogels. The obtained luminescent hybrid hydrogels exhibited an excellent fluorescence detection effect on formaldehyde. The detection limit for formaldehyde is 45.7 ppb, which is much lower than the WHO standard (80 ppb for indoor air). The novel, facile preparing procedure may extend the potential applications of hybrid lanthanide luminescent hydrogel as fluorescence probes for pollution monitoring, especially for formaldehyde and other organic aldehydes.
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JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2023
·Vol. 27
·期 6
·1411-1421
·
IF 2.5
Ma Qingyang,Liu Dian,Wang Bo,Liu Wenyi,Xiong Guoyao,Liu Jinping
Despite their non-flammability, low processing cost and wide electrochemical stability window, solid-state polymer electrolytes still exhibit certain challenges, such as high operating temperature and low room-temperature ionic conductivity. Cellulose acetate (CA) is a common natural polymer derivative, which is promising as a filler in polymer electrolytes due to its rich surface functional groups, superior mechanical properties and high porosity. Herein, CA is incorporated into a unique polymer-in-salt electrolyte based on lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) and polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP) to design a composite polymer electrolyte (PLCA). The influence of CA content on the overall performance of PLCA is investigated. With 10 wt% of CA, PLCA exhibits high room-temperature ionic conductivity of 4.33 × 10 −4 S cm −1 , high Li-ion transference number of 0.60 and a wide electrochemical stability window (4.8 V). The resulting LiFePO 4 |Li solid-state lithium battery delivers a specific discharge capacity of 160.17 mAh g −1 at 0.2 C, with stable cycling ability and good rate capability. CA is found to promote the dissociation of lithium salt, reduce the crystallinity of polymer and further create a new Li-ion transport pathway in PLCA, responsible for the battery performance improvement. Our work provides an opportunity to design high-performance composite polymer-in-salt electrolytes for advanced solid-state batteries.
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CHEMOSPHERE
·
2022
·
IF 8.943
Tingting Luo,Runkai Wang,Fei Chai,Lei Jiang,Pinhua Rao,Lili Yan,Xinjian Hu,Wei Zhang,Lianghuan Wei,Alireza Khataee,Ning Han
The manganese is successfully induced as a “bridge joint” to fabricate a new adsorbent (CNC–Mn-PEI) connecting cellulose nanocrystal (CNC) and polyethyleneimine (PEI) respectively. It was used to remove As (III) from waste water. It has been proved that the incompact CNC and PEI were successfully connected by Mn ions, which induced the formation of O–Mn–O bonds and the removal efficiency is maintained in the broad pH range of 4–8, even with the influence of NO 3 − and CO 3 2− . The CNC–Mn-PEI was characterized by Brunauer–Emmett–Telley (BET) method and the results showed that the nanoparticle of the specific surface area was 106.5753 m 2 /g, it has a significant improvement, compared with CNC–Mn-DW (0.1918 m 2 /g). The isotherm and kinetic parameters of arsenic removal on CNC–Mn-PEI were well-fitted by the Langmuir and pseudo-second-order models. The maximum adsorption capacities toward As (III) was 78.02 mg/g. After seven regeneration cycles, the removal of As (III) by the adsorbent decreased from 80.78% to 68.2%. Additionally, the hypothetical adsorption mechanism of “bridge joint” effect was established by FTIR and XPS, which provided the three activated sites from CNC–Mn-PEI can improve the arsenic removal efficiency, and providing a new stratagem for the arsenic pollution treatment.
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Qingtao Zeng,Yinan Zhao,Xuejun Lai,Changcheng Jiang,Binglin Wang,Hongqiang Li,Xingrong Zeng,Zhonghua Chen
The development of flame-retardant coating with sensitive fire warning is imperative but highly challenging in the “Internet of Everything Era”. In this study, a multifunctional fire protection nanocoating (MFNC) was fabricated on the surface of flammable materials by dip-coating Ti 3 C 2 T X (MXene), montmorillonite (MMT) nanosheet , and 2-ureido-4[1H]-pyrimidinone-containing cellulose (UPC) via layer-by-layer assembly. The MXene/UPC layer endowed the nanocoating with accurate temperature sensing capability because of the outstanding conductivity and unique thermoelectric characteristic of MXene. When being burnt, MFNC was able to trigger the fire-warning system in less than 4 s. Owing to the MMT/UPC layer, MFNC showed excellent flame retardancy due to the barrier and catalytic carbonization of MMT. MFNC led to the increase in the limiting oxygen index of the flammable materials by up to 40.0% and the vertical burning test reached the UL94 V-0 rating. More importantly, attributed to the multiple hydrogen bond interactions of UPC, MFNC displayed good self-healing capability. Its fire-warning performance could quickly recover after being damaged. Furthermore, MFNC exhibited sensitive piezoresistive sensing ability, which makes it a promising candidate for application in firefighter motion detection. Our work provides new insights into the fabrication and application of multifunctional smart and efficient fire-protection coatings.
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