Materials Today Communications
·
2022
·
IF 3.662
Zhe Huang,Shenghua Li,Lung-Chang Tsai,Tao Jiang,Ning Ma,Fang-Chang Tsai
A single molecule intumescent flame retardant was synthesized through in-situ polymerization by chitosan-based ammonium polyphosphate microencapsulated by melamine-formaldehyde resin. The multiple reactive hydroxyl and amino groups in its molecular chain made it a positively charged polymer with excellent coordination. The decomposition of melamine-formaldehyde resin produced a large amount of incombustible gas, which reduced the heat absorption on the surface of the composite material and inhibited its decomposition. Through thermogravimetric analysis , it was found that its thermal stability was better at high temperatures. Due to the decomposition of melamine-formaldehyde resin, a large amount of incombustible gas was produced, which reduced the heat absorption on its surface and inhibited its decomposition, so that polypropylene composites containing the flame retardant had a smooth decomposition process. The burning results showed that the limiting oxygen index and vertical combustion grade of the polypropylene composites containing the flame retardant had been improved, which the vertical combustion rating was V-1, and the limiting oxygen index was 25.7%. At the same time, it was clearly observed that composites containing the single-molecule intumescent flame retardant had an excellent anti-dripping effect. The surface temperature of the composite material was greatly reduced during combustion, from 343.7 ℃ to 156.9 ℃. Raman spectra and SEM of the surface carbon layer of the burned spline revealed the composite containing the flame retardant with a lower ID/IG value, indicating that the carbon layer it formed had more excellent crystallinity. Therefore, its carbon layer had a better structure and stability. It could be borne out that our single-molecule intumescent flame retardant had a good flame retardant effect on PP.
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DOI
高影响因子
Coatings
·
2021
·Vol. 11
·期 8
·914
·
IF 2.881
Zihao Dong,Ran Li,Yan Gong
With chitosan, nano-TiO2and nano-Ag as raw materials, nano-TiO2and nano-TiO2-Ag were modified by a surface modifier-sodium laurate. Chitosan (CTS), chitosan-nano-TiO2(CTS-TiO2), and chitosan-nano-TiO2-nano-Ag (CTS-TiO2-Ag) composite materials and corresponding films were prepared by a solution co-blending method. Then, the antibacterial performances of the above three types of materials againstEscherichia coli,Staphylococcus aureus, andBacillus subtiliswere compared. Moreover, potato and strawberry weight loss rates, peroxidase activity, and vitamin C contents after different film coating treatments were measured. Compared with CTS films, the CTS-TiO2-Ag and CTS-TiO2composite films both showed better physical properties, and both demonstrated higher antibacterial effects, especially forE.coli. Measurement of physiological indices in fruits and vegetables showed that the freshness-preserving effect of CTS-TiO2-Ag coating films was the most significant. In all, the CTS-TiO2-Ag coating films can actively contribute to the storage of fruits and vegetables at room temperature, and better ensure product quality. Thus, such films are meaningful for research and development of new fruit freshness-keeping techniques and materials.
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DOI
高影响因子
REACTIVE & FUNCTIONAL POLYMERS
·
2011
·
IF 2.546
Jiliang Wu,Chunyan Liao,Zheng Wang,Wenze Cheng,Nuo Zhou,Sheng Wang,Ying Wan
Chitosan–polycaprolactone (CH–PCL) copolymers with brush-like chain structures were synthesized. Some CH–PCLs with a PCL content less than 50 wt% were used to build glial cell line-derived neurotrophic factor (GDNF)-loaded microspheres via an emulsification method using genipin as a cross-linker. The resulting microspheres were spherical with a smooth surface and a diameter less than 40 μm; however, their loading efficiency could be higher than 80% if crosslinked properly. These microspheres had various swelling characteristics in lysozyme-containing PBS, which mainly depended on the PCL content, and they did not exhibit significant degradation up to 3 weeks. It is found that the PCL content in the CH–PCLs predominantly governed GDNF releases from some optimal microspheres and that the amount of cross-linker imposed limited impacts on the release behavior. Release kinetics revealed that GDNF release from microspheres was controlled by anomalous mechanisms involving Fickian diffusion and case-II transport. Some microspheres with an initial loading ratio of approximately 5-ng GDNF to 1.0-mg dry microsphere had sustained GDNF release upon addition of a simulant in vivo medium; an approximate linear rate of release was observed, which lasted over 4 weeks, was controllable and did not involve a significant burst release.
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DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2020
·
IF 5.162
Qing-Xiang Shi,Yan Li,Li Wang,Jia Wang,Yun-Li Cao
The supported chitosan (CS) adsorbent (FZCS) was successfully prepared by load CS on the BSCS supporter in this work. The adsorbent was characterized by elemental analysis , FT-IR, XRD , TGA , SEM and N 2 adsorption-desorption techniques. The results showed the FZCS sorbent displayed the high removal rate (97.95%) for Titan Yellow (TY) anionic dye in aqueous solutions owing to its properties combining amino active functional amino group from the CS itself and higher specific surface area and mesoporous structure from the BSCS support. Isotherm data conform to the Langmuir isothermal model with a maximum adsorption capacity of 120.48 mg/g at 30 °C, suggesting monolayer adsorption of TY on the FZCS sorbent. The data were very well fitted to the pseudo-second-order kinetics. The adsorption capacity of FZCS could maintain about 70% after six cycles. The research indicated that FZCS would be a promising, eco-friendly and effective sorbent for anionic dye wastewater treatment in the near future.
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Yuhang Yang,Xian Zhang,Zhuang Cheng,Zihui Wen,Jiage Yu,Feng Wang,Yu Ding
Silicon possesses high theoretical specific capacity but suffers from huge volume expansion and poor electrical conductivity during cycling, resulting in significantly reduced capacity and poor cycling stability. These issues could greatly be alleviated by the encapsulation of silicon nanoparticles in carbon materials. Therefore, a three-dimensional (3D) network Si@CTS precursor was prepared in this work through in-situ encapsulation of silicon nanoparticles in stable hydrogel formed by crosslinking chitosan with glutaraldehyde as a cross-linking agent. After freeze-drying followed by oxidation stabilization at 280 ºC for 2 h under air and subsequent heat treatment at 800 ºC for 2 h under Ar atmosphere, uniformly distributed 3D Si@C composites were obtained. The effects of added amounts of carbon nanotubes (CNTs) on the structures and electrochemical properties of the as-obtained composites were investigated. The results showed uniformly distributed silicon nanoparticles in the amorphous carbon layer owing to the freeze-drying and oxidation treatments conducive to maintaining the skeleton structure of the material. The amorphous carbon and appropriate CNTs effectively buffered the volume changes, as well as improved the ionic and electronic conductivity. Si@C/CNTs-10% showed better comprehensive electrochemical performances at CNTs added amount of about 10 wt%. The discharge specific capacities at 0.1 A·g −1 after 150 cycles, as well as at 1.0 and 2.0 A·g −1 after 1000 cycles were estimated to 943.1, 461.3, and 123.1 mAh·g −1 , respectively.
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DOI
高影响因子
JOURNAL OF POROUS MATERIALS
·
2023
·Vol. 31
·期 2
·611-624
·
IF 2.6
Zhao Xiaoliang,Lu Liyuan,Wan Wenpeng,Zhang Chuanhui,Liu Yuan,Luo Li,Zhu Tianke,Zhang Weijie
Marine mussels can adhere to various surfaces in a liquid environment by utilizing pedicle filaments, with the adhesive properties primarily attributed to the structure of catechol, the main component of the filament. To overcome the challenges associated with the complex preparation process, high cost, and potential biological rejection of naturally extracted or recombinantly expressed mussel proteins, researchers drew inspiration from mussels and utilized an oxidative crosslinking approach to prepare adhesive hydrogel materials. However, the hydrogels prepared using this method exhibited inferior mechanical properties and low viscosity. To address these limitations, in this study, a kind of mussel-inspired dual-crosslinked hydrogel was prepared by dual cross-linking with hydroxypropyl chitosan (HPCS) and hyaluronic acid (HA), based on catechol, an adhesion component in marine mussel pedicle filaments. Comparative analysis revealed that the mussel-inspired dual-crosslinked hydrogel exhibited significantly higher adhesion strength (up to 33.96 kPa) and improved mechanical properties (energy storage modulus ranging from 489 to 1032 Pa) compared to the mussel-inspired oxidatively cross-linked hydrogel. In addition, the mussel-inspired dual-crosslinked hydrogel demonstrated favorable swelling (up to 136.54 ± 0.22%), degradation, sustained-release, bacteriostatic and biocompatible properties. These findings suggest a promising potential for future applications in the field of biomedical materials.
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DOI
高影响因子
JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION
·
2017
·
IF 1.9
Xueqing Zou,Pengpeng Deng,Changjiang Zhou,Yulin Hou,Rongsheng Chen,Feng Liang,Liqiong Liao
Cryogel was synthesized through cryogelation of methacrylated carboxymethyl chitosan (mCMC) and poly(ethylene glycol) diacrylate (PEGDA) precursors by photopolymerization. Due to its excellent properties, such as fast swelling behavior, inter-connective porous structure, high water absorbing capacity, especially the presence of abundant carboxylmethyl groups on its backbone, the cryogel not only favored the absorption of silver ions but also was proved to be a good matrix for the incorporation of silver nanoparticles (AgNPs) by in situ chemical reduction. The structure, morphology, and swelling behavior of the cryogel and cryogel/AgNPs composite were characterized. And the results of inhibition zone test and antibacterial inhibition ratio indicated the cryogel/AgNPs composite exhibited prominent and durable antibacterial activity against Gram-negative E. coli and could be utilized as potential antibacterial materials.
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DOI
高影响因子
TEXTILE RESEARCH JOURNAL
·
2025
·
IF 1.9
Qirong Cai,Zhengkai Chen,Meng Li,Yifei Wang,Ying Wu,Yingjun Li,Dongxiao Ji,Xiaohong Qin
Aromatic textiles are a significant application of aromatherapy, and the durability and washability of such textiles are critical performance metrics. In this study, in situ embedded aromatic yarns were developed to enhance the longevity and wash resistance of the embedded fragrance. Electrospun nanofibers were employed as efficient carriers for aromatic agents, with ylang ylang oil (YYO) selected as the core material and chitosan (CS) as the wall material. The nanocapsules were prepared using ionic gelation to encapsulate the aromatic compound. The morphology, cross-linking, and thermal stability of the nanocapsules were characterized using scanning electron microscopy, X-ray diffraction, Fourier-transform infrared spectroscopy, and thermogravimetric analysis. The results indicate that cross-linking occurred between CS and sodium tripolyphosphate, YYO was effectively encapsulated within the nanocapsules, and the thermal stability was enhanced. These nanocapsules were then incorporated into nanofibers through electrospinning, which were subsequently deposited onto cotton webs, forming a novel aromatic yarn through further processing. The morphology, mechanical properties, and aromatic properties of the aromatic yarns were characterized. As a result, the nanofibers were coated inside the yarn, and the retention rate of YYO remained at 67.25% after 28 days. After 20 washing cycles, the YYO content in the aromatic yarn was 0.5 mg/g, indicating strong controlled-release performance and wash resistance. This study provides insights into the preparation of textiles with long-lasting aromatic properties and durability.
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DOI
高影响因子
Bioactive Carbohydrates and Dietary Fibre
·
2016
·
IF 0
Zhihua Wang,Yongbin Yan,Wei Li,Lihua Wang,Guoyuan Li,Caiqin Qin
Two kinds of water-soluble hydroxypropyl chitosan (HPCS) samples with different weight-average molecular weights ( M w ) (HHPCS for higher M w , 1.43×10 5 Da; LHPCS for lower M w , 5.71×10 3 Da) were used to investigate their absorption and distribution in mice by oral administration after being labeled by fluorescein isothiocyanate . The result of in vitro degradation showed that HPCS degraded more easily in the presence of lysozyme than in pepsin . After oral administration of HPCS, HPCS would undergo a series of degradation and absorption under the action of tissue cells and enzymes in the body. The absorption and distribution of HPCS in organ tissues was significantly influenced by its M w . With the decrease of M w , the absorption rate and amount of HPCS increased. In fact, only a small amount of HPCS and its catabolite with low M w was absorbed by the tissues, and most HPCS was metabolized and excreted out of body rapidly. Additionally, there was some accumulation of HPCS in liver, and so HPCS content in liver and kidney was higher. The whole HPCS plasma concentration was lower instead, due to rapid plasma clearance . The absorbed HPCS molecules still maintained a relatively higher concentration even after 16 h in the tested tissues. The research results gave some valuable data for the application of water-soluble chitosan in food and biomedicine , especially as a potential candidate for drug delivery systems.
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DOI
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN MEDICINE
·
2024
·Vol. 35
·期 1
·1-15
·
IF 4.2
Zhang Chenxi,Tan Chenjie,Shen Hangchong,Xu Qianqian,Pan Jiadong,Wang Xin
Hydrogels are currently widely used in regenerative medicine and wound repair due to their superior biocompatibility, reliable mechanical strength, and good morphological memory. We aimed to prepare a self-expanding hydrogel that can be used as a skin expander for the repair of large soft skin tissue defects. Self-expanding hydrogels were prepared by chemical cross-linking, which consisted of water-soluble chitosan (CS), acrylamide (AM), methylene bisacrylamide (NMBA), etc. Five groups of in vitro experiments, including (CS-AM) of 0% (pure AM group), 13.9%, 27.8%, 41.7%, and 55.6%, were conducted to determine mechanical properties, swelling properties, cytotoxicity, etc. In the rat model, both a tight skin area (neck) and a loose skin area (back) were selected for expansion with hydrogels. A total of 27.8% of the CS-AM samples expanded stably under the skin of the rats, achieving 370% expansion in the tight zone and 490% expansion in the flaccid zone. Subcutaneous histopathological examination suggested that the inflammation index of the pericolloid tissue was lower in the CS-AM group than in the pure AM group. Our results demonstrate that self-expanding CS-AM hydrogels have great potential for application as skin expanders. Graphical
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DOI
PubMed
高影响因子
IRANIAN POLYMER JOURNAL
·
2023
·Vol. 32
·期 9
·1189-1197
·
IF 3.1
Luo Yanrong,Lu Chunlan,Zhang Xiaolin,Zhan Shiping
With the widespread use of hydrogels, injectable hydrogels for the human body require higher safety and non-toxicity. The most important is the choice of cross-linking agent to be green. In this study, acylated chitosan macromolecular crosslinkers (MCS) were prepared by maleic acid (MA) and chitosan (CS). Its structure was confirmed by FTIR and 1 H NMR and its degree of acylation was also determined. Then, a series of polymeric network hydrogels were investigated. The cross-linked copolymer poly( N -isopropyacrylamide-maleic acid copolymer)/acylated chitosan P(NIPAM- co -MA)/MCS is a series of thermosensitive hydrogels formed by free radical polymerization of NIPAM and MA with MCS as cross-linking agent. The apparent morphology, thermosensitive transition point, and hydrophilicity were investigated. The results show that the hydrogel has a homogeneous pore structure inside. The optimal low critical solution temperature (LCST) was 36.66 ℃. In addition, with the increase of maleic acid content, the water contact angle of the hydrogel is smaller, that is, the hydrophilic effect is better. The results indicate that the P(NIPAM- co -MA)/MCS hydrogels were synthesized successfully and may be a potential material for biomedical, drug delivery, or absorption application. This study can provide a certain research basis and relevant theoretical basis for clinical practice. Graphical abstract
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DOI
高影响因子
MOLECULES
·
2025
·Vol. 30
·期 20
·4067
·
IF 4.6
Yaping Cheng,Haimin Liao,Huimei Shan,Yunquan Liu,Huinan Mo
Antimony (Sb), as a toxic heavy metal, has drawn worldwide attention, and its efficient removal from water has become increasingly urgent. In this study, an iron-modified alkaline lignin chitosan (Fe-ALCS) gel bead is prepared by the freeze-drying method to remove Sb(III) from the aqueous solution. The static adsorption experiment discusses the various environmental influences on the adsorption performance of Fe-ALCS for Sb(III) removal. The adsorption mechanism is explored by combining adsorption kinetics, isothermal adsorption, and characterization methods (such as FTIR, XRD, XPS, etc). The results show that the equilibrium adsorption capacity of Sb(III) decreases with the increase in pH and mass–volume ratio. With the increase in the initial Sb(III) concentration,Qeshowed a rapid increasing trend in the range of 50–100 mg/L and continued to rise with the extension of contact time (t), reaching the maximum value at 3540 min. Under the optimal conditions of pH = 3,m/v= 1.0 g/L, andC0= 20 mg/L, the removal efficiency (Re) value is 95.07%, which is still approximately 86.8% after five adsorption–desorption cycles. The maximum adsorption capacity is 266.58 mg/g fitted by the Langmuir model. The adsorption mechanism is mainly related to the iron-based active site of Fe–O(OH), where the O–H on its surface undergoes ligand exchange with Sb(OH)3to form a stable Fe–O–Sb coordination structure. Additionally, C–OH, C–O, and other functional groups in ALCS also contribute to Sb adsorption. Fe-ALCS is an environmentally friendly, renewable, and convenient biomass adsorbent with good potential for wastewater treatment.
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高影响因子
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