JOURNAL OF POLYMER ENGINEERING
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2024
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IF 1.7
Yan Ren,Yonggang Lin,Yabei Ding,Ruimin Tang,Minglong Yuan,Hongli Li,Yongming Chuan
Poly( l -lactide- co -caprolactone) (PLCL) is the polymeric material with good biodegradability and biocompatible properties, but it is insufficient in strength properties that the pure PLCL is performed as orthopedic bandage. The PLCL has been blended with the laponite which is modified by cetyltrimethylammonium bromide (CTAB) to prepare composited bandage splines. The organic-modified laponite (OM-laponite) results of Fourier transform infrared (FTIR) and thermogravimetry analysis (TG) indicate that the laponite was successfully grafted with CTAB and the thermal stability was improved with increasing CTAB. The mechanical properties reveal that elongation at break strengthen with the increasing OM-laponite. When the content of OM-laponite is 2.0 %, the elongation at break and tensile strength of composited spline are superior to the medical orthopedic bandage. The results of thermal stability show that it was helpful to improve the crystallization properties of PLCL with the addition of OM-laponite. The water contact angle results demonstrate that the hydrophilicity is enhanced and is beneficial to cell adhesion. The results of cell experiment illustrate that the composite materials have a certain effect on cell proliferation when the content of OM-laponite is less than 2 %. Compared with the medical orthopedic bandage, it is satisfied with the application requirements.
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高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Yanxia Wang,Hao Wang,Xing Su
Nanocomposite hydrogels are supposed to combine the advantages of both a polymer matrix and filler. Without the use of organic additives, the incorporation of high-content inorganic nanofillers along with elevated properties remains a challenge. Accordingly, facilitated by the stepwise salting-out method, we proposed the PVA nanocomposite hydrogels containing multiple nanoscale minerals. Three kinds of nanominerals could reach certain electrostatic equilibrium, which helped to maintain their well-dispersed state even in the PVA matrix with high salinity. Unlike the traditional PVA nanocomposite hydrogels, whose mechanical properties tended to decrease upon the incorporation of inorganic fillers, the incorporation of multiple nanoscale minerals enhanced the mechanical properties including tensile strength and elongation at break. Besides, the unique multiple nanoscale mineral structure endowed our proposed nanocomposite hydrogels with high versatility, which could act as thermal insulators, flame-retardant matter, and respiration detectors. Instead of organic modification, this work innovatively utilizes intrinsic inorganic-to-inorganic interactions for achieving a fine nanocomposite microstructure in a polymer matrix. Our proposed nanocomposite hydrogels address potential applications for stimulus-responsive devices.
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高影响因子
FOOD RESEARCH INTERNATIONAL
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2025
·
IF 8
Minmin Chen,Linlin Li,Wei Ji,Wensheng Lu,Xiaochao Tang,Suwei Jiang,Hualin Wang
Petroleum-based food packaging causes substantial environmental damage through waste accumulation and microplastic pollution. Therefore, replacing it with biodegradable polymers to extend the shelf life of food products is highly desirable. In this work, a bilayer functional composite with barrier properties and antimicrobial activity was developed for pork preservation. The outer barrier layer of gelatin/laponite (Ge/La) was fabricated by the casting method, while the inner antimicrobial layer of zein/eugenol (ZN/Eu) was prepared through direct electrospinning on Ge/La. The incorporation of La enhanced the thermal stability, mechanical strength, and moisture barrier of the outer layer, while the encapsulation of Eu endowed the inner layer with excellent antioxidant and antimicrobial activities. Furthermore, the Eu release from ZN/Eu fibers was found to follow Fickian diffusion. The bilayer composite of Ge/La@ZN/Eu can prolong pork shelf life by 1 d at 25 °C, demonstrating its great potential in active food packaging
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PubMed
高影响因子
APPLIED CLAY SCIENCE
·
2020
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IF 4.605
Hafezeh Nabipour,Xin Wang,Lei Song,Yuan Hu
Flexible polyurethane (FPU) foam as a primary softening material is utilized in soft furnishings of upholstered mattresses and furniture. High flammability of this soft furnishing material usually leads to residential fires, causing severe fatalities. In the present study, we proposed a bio-based and environmentally-friendly flame retardant multilayered coating consisted of laponite (LAP), branched polyethyleneimine (BPEI), sodium alginate (SA) and chitosan (CH) that was deposited onto FPU foams to enhance their fire safety property. Based on the thermogravimetric analysis results, it was indicated that after the deposition of LAP, the thermal stability of the coated FPU foams increased sharply. Foam treated with 9 quad layers (QL) of BPEI/SA/CH/LAP multilayered coating showed self-extinguishing behavior in an open flame burning test. Furthermore, the values of peak heat release rate (PHRR), total heat release (THR) and smoke release rate (SPR) of the coated FPU foams reduced considerably in comparison to those of the pure FPU foam. Specifically, 9 QLs of BPEI/SA/CH/LAP declined the PHRR and the THR by 74% and 42.6%, respectively. The coated FPU foam also showed self-extinguishing and anti-dripping features in an open flame testing. Therefore, it can be stated that LAP-based coating has incredible benefits in decreasing fire risk of FPU foams. Moreover, the flame retardant mechanism of this LAP-based multilayered coating was proposed. The LAP-based coating functioned as a physical insulating barrier that successfully retarded the permeation of the flammable volatiles, heat and oxygen. Hence, the significant decrease in PHRR with the self-extinguishing behavior was achieved, implying promising potential of this LAP-based multilayered coating to enhance the fire safety of FPU foams.
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高影响因子
ACS Applied Materials & Interfaces
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2023
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IF 9.5
Junhong Li,Faqiang Li,Dinggen Li,Dongming Cheng,Zhiyan Wang,Xueting Liu,Haonan Wang,Xianwei Zeng,Yunhui Huang,Henghui Xu
Solid polymer electrolytes suffer from the low ionic conductivity and poor capability of suppressing lithium dendrites, which have greatly hindered the practical application of solid-state lithium-metal batteries. Here, we report a novel laponite sheet (LS) with a large negatively charged surface as an additive in a solid composite electrolyte (poly(ethylene oxide)-LS) to rearrange the lithium-ion environment and enhance the mechanical strength of the electrolytes (PEO-LS). The strong electrostatic regulation of laponite sheets assists the dissociation of lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) and constructs multiple transport channels for free lithium ions, achieving a high ionic conductivity of 1.1 × 10–3 S cm–1 at 60 °C. Furthermore, LS facilitates the in situ formation of a LiF-rich interface because of the boosting TFSI– anion concentration, which significantly suppresses lithium dendrites and prevents short circuit. As a result, the assembled LiFePO4|PEO-LS|Li battery demonstrates a long cycle life of over 800 cycles and a high Coulombic efficiency of 99.9% at 1C and 60 °C. When paired with a high-voltage NCM811 cathode, the battery also demonstrates excellent cycling stability and rate capability.
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高影响因子
ACS Applied Materials & Interfaces
·
2015
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IF 6.723
Changpeng Li,Changdao Mu,Wei Lin,To Ngai
In recent years, inorganic nanoparticles such as Laponite have frequently been incorporated into polymer matrixes to obtain nanocomposite hydrogels with hierarchical structures, ultrastrong tensibilities, and high transparencies. Despite their unique physical and chemical properties, only a few reports have evaluated Laponite-based nanocomposite hydrogels for biomedical applications. This article presents the synthesis and characterization of a novel, hemocompatible nanocomposite hydrogels by in situ polymerization of acrylamide (AAm) in a mixed suspension containing Laponite and gelatin. The compatibility, structure, thermal stability, and mechanical properties of the resulting NC gels with varied gel compositions were investigated. Our results show that the prepared nanocomposite hydrogels exhibit good thermal stability and mechanical properties. The introduction of a biocompatible polymer, gelatin, into the polymer matrix did not change the transparency and homogeneity of the resulting nanocomposite hydrogels, but it significantly decreased the hydrogel’s pH-responsive properties. More importantly, gelatins that were incorporated into the PAAm network resisted nonspecific protein adsorption, improved the degree of hemolysis, and eventually prolonged the clotting time, indicating that the in vitro hemocompatibility of the resulting nanocomposite hydrogels had been substantially enhanced. Therefore, these nanocomposite hydrogels provide opportunities for potential use in various biomedical applications.
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高影响因子
Royal Society Open Science
·
2022
·Vol. 9
·期 10
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IF 3.653
Xiaodong Dong,Jinsheng Sun,Xianbin Huang,Kaihe Lv,Zhishi Zhou,Chongyang Gao
In drilling deep complex formations, most drilling fluid additives have insufficient temperature and salt tolerance, resulting in the decline of drilling fluid performance. This study used 2-acrylamide-2-methylpropane sulfonic acid, acrylamide, dimethyl diallyl ammonium chloride and modified nano-laponite to synthesize a nanocomposite filtrate reducer (ANDP) with excellent temperature and salt resistance, which can maintain the performance of drilling fluid. The structure of ANDP was analysed by a transmission electron microscope and an infrared spectrometer. The thermal stability of ANDP was studied by thermogravimetric analysis. The performance of ANDP was evaluated in a water-based drilling fluid. The mechanism was analysed per clay particle size distribution, Zeta potential, filter cake permeability and scanning electron microscopy imaging. The results show that ANDP has good thermal stability and the expected molecular structure. The filtration of freshwater drilling fluid after ageing at 200°C is 10.4 ml and that of saturated brine drilling fluid is 6.4 ml after ageing at 150°C. Mechanism analysis suggests that the ANDP increases the thickness of clay particle hydration layer and maintains the colloidal stability of the drilling fluid. ANDP inhibits the agglomeration of clay particles and significantly reduces the filtration by forming dense mud cake.
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PubMed
高影响因子
POLYMER
·
2023
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IF 4.6
Yuhui Xie,Xue Lv,Xinyi Sui,Song Tian,Li'an Jiang,Shulin Sun
In this paper, the physicochemical double cross-linking nanocomposite hydrogels were prepared. Due to the addition of ionic liquid (1-butyl-3-methylimidazolium chloride salt), Laponite cannot spontaneously form a high thixotropic gel in water. The homogeneously dispersed Laponite nanosheets act as dynamic physical crosslinking sites, which cooperate with the chemical crosslinking center of MBA in the polymer chain segments and build a super-strong and super-tough hydrogel network structure. The PAM/Laponite/IL nanocomposite hydrogel achieves excellent tensile strength up to 1191 Kpa, a high tensile strain of 6842%, and a very high toughness of 26.62 MJ/m 3 . In this paper, an effective mechanism to enhance the mechanical properties of the hydrogel is proposed based on the structural evolution of Laponite. This highly flexible nanocomposite hydrogel shows excellent potential as a load-bearing material.
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高影响因子
APPLIED CLAY SCIENCE
·
2024
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IF 5.3
Hao Zhang,Chaopeng Fu,Jianhao Ding,Guoqiang Xu,Chunhui Zhou,Zhenyu He,Zhimin Ou,Dongshen Tong,Minyang Qiu,Xiangdong Zhou,Xiaonian Li
An electrostatic adsorption-based, surface-enhanced Raman scattering (SERS) assay for the detection of charged analytes was developed, which utilized Ag-deposited laponite nanoparticles (Ag@Lap NPs) as both a SERS substrate and negatively charged absorber for the capture of positively charged analytes, such as methylene blue (MB) and rhodamine B (RB). The strong electrostatic interaction between the MB analyte and the Ag@Lap NPs resulted in an effective concentration of MB on the Ag content of Ag@Lap and provided a limit of detection (LOD) sensitivity of 10 −11 M, which was more sensitive by a factor of 25,000 over the LOD of MB (0.25 × 10 −6 M) in a similar SERS assay using bare Ag NPs with low charges. Additionally, a 100-fold improvement in LOD was also observed for RB analyte on Ag@Lap NPs over that on bare Ag NPs. Unlike positively charged, the negatively charged analytes, such as direct black-168 (DB-168) and methyl orange (MO), exhibited a weaker adsorption on the same negatively charged surface of Ag@Lap NPs due to electrostatic repulsion, leading to a lower SERS sensitivity. These results indicated that the electrostatic attraction between the analytes and SERS substrate played an important role in enriching the number of analytes on the active substrate to significantly improve the SERS intensity, suggesting a new strategy, which could be easily adapted to environmental analysis and biosensor applications by concentrating and detecting charged analytes, such as pollutants and dye molecules in nanotags.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2025
·
IF 2.8
Hongyu Xu,Jingjing Zhang,Xue Lv
Due to their biocompatibility and tissue-like properties, hydrogels have garnered considerable interest in bioelectronics field. Nevertheless, their practical implementation is limited by factors such as inadequate mechanical strength, weak interface adhesion, and the lack of antimicrobial properties. To address these challenges, a novel conductive hydrogel was synthesized through free radical polymerization, incorporating laponite (LA), tannic acid (TA), polyacrylic acid (PAA), and polyacrylamide (pAAm). An innovative approach was employed to enhance LA's dispersion through ionic liquid (IL) in water through electrostatic interactions. The integration of TA, PAA, and PAAm with LA sheets via multiple hydrogen bonds resulted in excellent mechanical properties. The resulting P(AAm-AA)/IL-LA/TA hydrogel exhibits impressive characteristics, including a fracture stress of 0.44 MPa, a strain of 1800%. Notably, the hydrogel's TA component exhibits strong antibacterial activity against Staphylococcus aureus and Escherichia coli . This advanced hydrogel sensor effectively monitors human movements, displaying a gauge factor of 12.7. Furthermore, its versatile and conductive nature facilitates adhesion to a wide range of substrates, making it a promising candidate for applications in human activity monitoring, electronic devices, and medical health surveillance.
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高影响因子
Materials Today Communications
·
2025
·
IF 4.5
He Zhang,Hua Liu,Jianing Xu,Chao Zhou
This study utilized ionic liquids (ILs) to exfoliate Laponite nanosheets(XLP), altering the interlayer spacing of XLP, thus significantly improving its dispersibility and stability. More importantly, ILs can also benefit the dispersibility of graphene (GN) as well. The synergistic effects of sodium carboxymethyl cellulose (CMC), acrylamide, acrylic acid, SMA, and XLP significantly enhanced the mechanical properties of the hydrogel. At the same time, evenly dispersed GN enhanced the conductivity and sensing ability of the hydrogel dramatically. The hydrogel's multi-network structure, including physical cross-linking, chemical cross-linking, hydrophobic associations, and hydrogen bonding interactions, exhibited excellent mechanical performance and flexibility. The hydrogel sensors demonstrated excellent strain sensing capabilities, effectively responding under various strain conditions with high sensitivity and stability over a wide range of strains. Notably, the hydrogel sensors showed good responsiveness and repeatability in detecting human joint movements (wrist, elbow, knee), allowing for the differentiation of different joint motions. In summary, the P(AM-co-AA)/SMA/CMC/XLP/GN hydrogel, with its excellent dispersibility, mechanical properties, and sensing capabilities, exhibits great potential for applications in flexible sensors and wearable devices. This multi-mechanism enhancement strategy provides an effective method and theoretical foundation for designing high-performance hydrogel materials. Future research can further optimize the material's properties and expand its applications in other fields.
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高影响因子
Journal of Environmental Chemical Engineering
·
2021
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IF 5.909
Bo Gao,Hairong Yu,Jingya Wen,Hongju Zeng,Ting Liang,Fang Zuo,Changjing Cheng
Dye pollution has become a serious threat to environment and human health. Although versatile hydrogels have attracted intensive attentions due to their outstanding adsorption properties, the ultrahigh adsorption capacity and mechanical property are still two critical challenges for the practical applications. Herein, a super-adsorbent poly(acrylic acid)/laponite (PAAc/Lap) nanocomposite hydrogel with ultrahigh mechanical property and adsorption capacity of methylene blue (MB) is prepared by incorporating physical cross-linking with sparse chemical cross-linking. The hydrogel possesses porous 3D network structures and a fairly high water penetration with 1360 times of swelling ratio, which can allow the internal adsorption sites to be fully exposed and facilitate the adsorption. The adsorption capacity of MB can reach up to 3846 mg/g, which is almost the first time that a PAAc-based adsorbent could display superior adsorption capacity of more than 3800 mg/g towards MB. Important factors affecting the adsorption are also investigated, and the adsorption behavior is well fitted by the pseudo-second-order model and Langmuir isotherm model. More importantly, the appropriate physical cross-linking and sparse chemical cross-linking in the polymeric network endows hydrogel with superior mechanical properties. The tensile stress and strain are as high as 1.18 MPa and 2192%, which can facilitate the expansive applications and practical treatment. Mechanism analyses illustrate that the electrostatic interactions and cation-exchange between the functional groups of hydrogel and MB molecules contribute to the extraordinary adsorption ability. The proposed PAAc/Lap hydrogel with ultrahigh adsorption capacity and mechanical property is highly promising as an efficient super adsorbent for water treatment .
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高影响因子
危险品化学品经营许可证（带存储）