JOURNAL OF POLYMERS AND THE ENVIRONMENT
·
2022
·Vol. 30
·期 7
·2774-2784
·
IF 4.705
Yan Zhuofeng,Zhu Kaixiao,Li Xiangqi,Wu Xiao
Bacterial cellulose (BC) aerogel has great potential in treating oil spill and organic pollutant. However, its inherent hydrophilicity and poor rigidity limit its practical application and recyclability. In this study, elastically compressible and high oil-absorbing aerogels were developed by freeze-drying aqueous suspensions with appropriate BC concentrations, followed by a chemical vapor deposition of methyltrimethoxysilane with ammonia as catalyst. The modified aerogel shows high water contact angle of 142° and enhanced compression resistance. The effect of BC concentration on the absorption capacity and recyclability of aerogel has been investigated. The results show that the aerogel prepared with 0.3 wt% BC exhibits simultaneously high absorption capacity (121.8–284.1 g/g) and excellent recyclability. Futhermore, the aerogel could also separate chloroform-water mixture by gravity-driven filtration, giving the separation efficiency of 96.7%. Therefore, this economical green aerogel provides a feasible strategy for solving oil leakage in industry.
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ACS Omega
·
2021
·
IF 3.512
Ruohan Yang,Xinyu Lu,Xiaoli Gu
Cellulose is the most abundant natural biopolymer material, which has been widely used in film making and food packaging in recent years. However, lignin, a natural bioaromatic material, is always applied as a waste resource due to its low utilization efficiency. In this study, a ZnCl2/CaCl2/cellulose mixed system was used to prepare film materials via a regeneration method. The chemical structure and corresponding properties were characterized. The thermal decomposition process of film materials showed that with an increase of the heating rate, the maximum weight loss temperature gradually shifted to the higher-temperature region. Additionally, the combination of lignin with cellulose as composite films can effectively improve thermal stability. Furthermore, kinetics methods such as Kissing–Akahira–Sunose (KAS), Flynn–Wall–Ozawa (FWO), and Friedman were used to calculate the average activation energy (E). This study proposed a facile method for preparing biobased multifunctional composite films using two kinds of naturally renewable materials.
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ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Jie Wei,Shuai Jia,Jie Guan,Chao Ma,Ziqiang Shao
The design of humidity actuators with high response sensitivity (especially actuation time) while maintaining favorable mechanical properties is important for advanced intelligent manufacturing, like soft robotics and smart devices, but still remains a challenge. Here, we fabricate a robust and conductive composite film-based humidity actuator with synergetic benefits from one-dimensional cellulose nanofibers (CNFs) and carbon nanotubes (CNTs) as well as two-dimensional graphene oxide (GO) via an efficient vacuum-assisted self-assembly method. Owing to the excellent moisture sensitivity of CNF and GO, the hydrophobic CNT favoring rapid desorption of water molecules, and the unique porous structure with numerous nanochannels for accelerating the water exchange rate, this CNF/GO/CNT composite film delivers excellent actuation including an ultrafast response/recovery (0.8/2 s), large deformation, and sufficient cycle stability (no detectable degradation after 1000 cycles) in response to ambient gradient humidity. Intriguingly, the actuator could also achieve a superior flexibility, a good mechanical strength (201 MPa), a desirable toughness (6.6 MJ/m3), and stable electrical conductivity. Taking advantage of these benefits, the actuator is conceptually fabricated into various smart devices including mechanical grippers, crawling robotics, and humidity control switches, which is expected to hold great promise toward practical applications.
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Materials Today Bio
·
2023
·
IF 8.2
Shengyu Li,Lihong Gong,Jianglin Chen,Xijin Wu,Xia Liu,Huiying Fu,Qiyang Shou
Excessive bleeding is associated with a high mortality risk. In this study, citric acid and ascorbic acid were sequentially modified on the surface of microcrystalline cellulose (MCAA) to increase its carboxyl content, and their potential as hemostatic materials was investigated. The MCAA exhibited a carboxylic group content of 9.52 %, higher than that of citric acid grafted microcrystalline cellulose (MCA) at 4.6 %. Carboxyl functionalization of microcrystalline cellulose surfaces not only plays a fundamental role in the structure of composite materials but also aids in the absorption of plasma and stimulation of platelets. Fourier -transform infrared (FT-IR), thermogravimetric analysis (TGA) and X-ray photoelectron spectroscopy (XPS) spectra confirmed that carboxyl groups were successfully introduced onto the cellulose surface. Physical properties tests indicated that the MCAA possessed higher thermal stability (T max = 472.2 °C) compared to microcrystalline cellulose (MCC). Additionally, in vitro hemocompatibility, cytotoxicity and hemostatic property results demonstrated that MCAA displayed good biocompatibility (hemolysis ratio <1 %), optimal cell compatibility (cell viability exceeded 100 % after 72 h incubation), and impressive hemostatic effect (BCI MCAA = 31.3 %). Based on these findings, the hemostatic effect of covering a wound with MCAA was assessed, revealing enhanced hemostatic properties using MCAA in tail-amputation and liver-injury hemorrhage models. Furthermore, exploration into hemostatic mechanisms revealed that MCAA can significantly accelerate coagulation through rapid platelet aggregation and activation of the clotting cascade. Notably, MCAA showed remarkable biocompatibility and induced minimal skin irritation. In conclusion, the results affirmed that MCAA is a safe and potentially effective hemostatic agent for hemorrhage control.
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Polymers
·
2023
·Vol. 15
·期 23
·4505
·
IF 5
Jiao Tan,Yinchun Liang,Lihui Sun,Zhanping Yang,Jingjing Xu,Dejun Dong,Huan Liu
Cellulose acetate (CA) is widely used in cigarette filters and packaging films, but due to its acetylation, it is difficult to degrade in the natural environment, and the problem of pollution has become a serious challenge. Understanding the degradation behavior and performance of CA in different environments is the basis and prerequisite for achieving its comprehensive utilization and developing efficient degradation methods. In this study, we investigated the degradation performance of CA in different aqueous environments to evaluate the effects of pH, salinity and microorganisms on CA degradation. The CA tows and films were immersed in HCl, NaOH solution, river water, seawater or homemade seawater for 16 weeks and the degradation mechanism was investigated by the changes in weight loss rate, degree of substitution, hydrophilicity, molecular structure and surface morphology. The results showed that the degradation of CA tow and film were the fastest in NaOH solution; the weight loss rates after 16 weeks were 40.29% and 39.63%, respectively, followed by HCl solution, and the degradation performance of CA tow was better than that of film. After 16 weeks of degradation in river water, seawater and homemade seawater, all the weight loss rates were less than 3%. In summary, this study illustrated that the environmental acidity, basicity and high concentration of inorganic salts had a critical promotion effect on the non-enzymatic hydrolysis of CA, whereas the number and type of microorganisms were the key factors affecting the biodegradation of CA.Keywords:cellulose acetate;different aqueous conditions;degradation
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EUROPEAN POLYMER JOURNAL
·
2023
·
IF 6
Yuanlong Li,Chaojie Chen,Guoqing Cui,Li Liu,Chao Zhou,Guangfeng Wu
Ion-conducting hydrogels are a widely recognised material for skin sensors and significant progress has been made in the development of stretchable and self-healing conductive materials. However, hydrogels still present challenges in terms of water retention and frost resistance, which have a profound impact on their mechanical and conductive properties. In order to address these issues, we have used a straightforward approach to fabricate novel ion-conductive hydrogels. In this study, physical interactions and covalent binding in the hydrogel-based system conferred excellent tensile properties (up to 1071.3 % strain) and high toughness (927 kJ/m 3 ), in addition to the introduction of hydroxyethyl cellulose that enabled the hydrogels to have good biocompatibility and mechanical properties, and the strong hydration of lithium chloride that conferred the hydrogels high electrical conductivity (2.16 S/m) and frost resistance. In particular, the hydrogel containing 5 wt% lithium chloride showed significant flexibility and extensibility even under the harsh conditions of −15℃, indicating its potential for cold climate applications.
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INDUSTRIAL CROPS AND PRODUCTS
·
2023
·
IF 5.9
Yuzhen Du,Baoying Shi,Xiayu Luan,Yufeng Wang,Haiyan Song
Storage and transportation of fresh fruits and vegetables result in significant wastage, making their preservation post-harvest a global issue. Although petroleum-based synthetic wax is commonly used in fruit post-harvest preservation due to its effectiveness, its adverse effects on ecological environment and human health cannot be ignored. Hence, it is imperative to explore natural and sustainable coatings that can serve as an eco-friendly and healthy alternative to petroleum-based synthetic waxes for fruit preservation. In this study, we developed a biocomposite coating based on chitosan (CS) as the bio-based film forming material, cellulose nanocrystals (CNC) as the reinforcement and sodium tripolyphosphate (TPP) as the crosslinking agent. By employing the dip coating process, it becomes feasible to apply micron-sized films onto the surfaces of diverse perishable fruits. The results revealed that the CNC and TPP significantly enhanced mechanical strength, oxygen barrier performance, thermal stability, antibacterial activity, and hydrophobicity of the coating. As a proof-of concept, bananas were utilized as experimental samples to investigate the impact of the coating. The findings demonstrate the efficacy of this coating in preserving the fruit's visual appeal and prolonging its storage duration. The coating can be used in various scenarios and on different products, having excellent potential in preservation technology, transportation and storage of postharvest agricultural products. The utilization of a multifunctional coating based on chitosan represents a promising and sustainable approach to address the pressing issue of global food waste. This innovative coating offers a cost-effective solution to effectively reduce postharvest losses of perishable foods, contributing to a more sustainable food system.
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CARBOHYDRATE POLYMERS
·
2021
·
IF 9.381
Jie Zhou,Zhiqiang Fang,Jinyi Cui,Xiao Zhang,Yong Qian,Weifeng Liu,Dongjie Yang,Xueqing Qiu
The simultaneous attainment of high strength and high toughness of transparent cellulose nanofibril (CNF) film can expedite its uses in advanced applications. In this work, a wood-inspired strategy is proposed to address the conflict between strength and toughness by using natural derived lignosulfonic acid (LA) as a reinforcing additive. Only 1 wt% LA addition can double the toughness (11.0±1.3 MJ/m 3 ) of pure CNF film. Consequently, the as-prepared CNF/LA-1 nanocomposite film not only exhibits superior mechanical properties (23.6±1.3 MJ/m 3 toughness, 249±6 MPa strength, and 15.4±1.4 % strain), but also maintains an excellent optical transparency of 91.2 % (550 nm). Furthermore, the mechanism for simultaneously enhancing strength and toughness is essentially attributed to the improved hydrogen bonding between CNF-OH and LA-SO 3 H and effective energy dissipation system. This work provides a green and effective approach to prepare strong yet tough and transparent biodegradable CNF film for high-end applications.
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GREEN CHEMISTRY
·
2021
·Vol. 23
·期 5
·2069-2078
·
IF 10.182
De-Fa Hou,Meng-Lei Li,Cong Yan,Ling Zhou,Zheng-Ying Liu,Wei Yang,Ming-Bo Yang
Cellulose is the most abundant natural macromolecular material, which offers a potential alternative feedstock to petroleum-based polymers. However, the large-scale and sustainable transformation of this biomass into available bio-plastics is still a challenge due to its inherent recalcitrance. Here, a sustainable esterification strategy of cellulose was developed to efficiently synthesize cellulose oleate (COE) by ball milling to endow cellulose with thermoplasticity. In this strategy, a low dosage of oleic acid (6 mol per anhydroglucose) and no solvent were used to achieve the goal during the ball-milling process. According to differential scanning calorimetry (DSC) analysis, the synthesized COEs possessed two major glass transitions at 25.6 °C–57.3 °C and 153.8 °C–172.5 °C corresponding to the motion of oleic side chains and cellulose backbones, respectively. Besides, the prepared COEs with a high degree of substitution (DS, 2.34–2.55) can be readily processed into homogeneous films with flexibility, transparency, and hydrophobicity by hot-pressing at 160 °C. This strategy is advantageous over traditional methods in the aspects of reduced reactant dosage, improved sustainability, and enhanced efficiency, which represents a potential green route to fabricate melt-processable cellulose esters in industry.
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MATERIALS CHEMISTRY AND PHYSICS
·
2020
·
IF 3.408
Hongli Bian,Lei Li,Ziqiang Shao,Jianxin Liu,Zhihua Li,Xuan Zhang
Octogen (HMX) composites are widely concerned as defensing weapon warhead due to the superior stability and high energy density . However, there still remain huge challenges for the fabrication of HMX composites with high loading capacity as well as reduced impact sensitivity. Among the various ecofriendly materials reported to date, cellulose has been highlighted as a promising carrier for HMX because of its natural abundance, low cost, physicochemical robustness, lightweight, and recyclability. Herein, we demonstrate a straightforward, eco-friendly suspension atomization regeneration process to prepare cellulose aerogel microspheres (CAMs). Then HMX was homogeneously embedded into the porous CAMs to obtain HMX composite materials (HCMs). As a result, a three-dimensional (3D) network-structure filled with a large number of HMX particles (93.8%) was achieved with insensitive features. Specifically, the impact sensitivity was decreased by 137.13%, the friction sensitivity was reduced to 0%, and the thermal stability of composite energetic materials was also greatly improved. The detonation velocity was estimated as 8136 m/s, almost the same as the calculated value. The combination of cellulose aerogels and HMX broadens the application of cellulose in energetic materials and brings unprecedented potential for energetic aerogel materials with ultra-high loading capacity.
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CARBOHYDRATE POLYMERS
·
2020
·
IF 7.182
Zhongsheng Ma,Qiangzi Li,Bijia Wang,Xueling Feng,Hong Xu,Zhiping Mao,Chun You,Xiaofeng Sui
Nanocellulose are promising Pickering emulsion stabilizers for being sustainable and non-toxic. In this work, semicrystalline cellulose oligomers (SCCO), which were synthesized from maltodextrin using cellobiose as primer by in vitro enzymatic biosystem, were exploited as stabilizers for oil-in-water Pickering emulsions. At first, the morphology, structure, thermal and rheological properties of SCCO suspensions were characterized, showing that SCCO had a sheet morphology and typical cellulose-Ⅱ structure with 56 % crystallinity. Then the kinetic stabilities of emulsions containing various amounts of SCCO were evaluated against external stress such as pH, ionic strength, and temperature. Noting that SCCO-Pickering emulsions exhibited excellent stabilities against changes in centrifugation, pH, ionic strengths, and temperatures, and it was also kinetically stable for up to 6 months. Both SCCO suspensions and their emulsions exhibited gel-like structures and shear-thinning behaviors. These results demonstrated great potential of SCCO to be applied as nanocellulosic emulsifiers in food, cosmetic and pharmaceutical industries.
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CARBOHYDRATE POLYMERS
·
2020
·
IF 7.182
Yanling Sun,Yunming Wang,Longhui Li,Mei Li,Yue Fu,Jiaqi Zheng,Dan Chen,Yun Zhang,Huamin Zhou
Cellulose limited by fusibility and solubility is impossible to be directly thermoformed, of which the existing progress crucially relies on larger liquids, making it hard to achieve a direct all-green manufacture. Here, we propose an innovative strategy that the surface molecular chains of cellulose nanospheres are activated at 100 °C and intertwined under 500 MPa because of the high molecular activity on the surface of nanospheres and the reduction of activation energy after ball-milling. It is confirmed that only physical changes are involved, according to infrared spectrum. Results show that applicable mechanical properties (hardness and modulus reach 0.44 and 9.66 GPa, respectively) are successfully obtained. Simultaneously, the optimum optical performance of all-cellulose substrate reaches more than 80 % at visible light. Combined with their intrinsic properties, these cellulose-based products could be potentially utilized as biomass substrates. Therefore, our innovative strategy opens up a door for the direct thermoforming of cellulose.
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