JOURNAL OF APPLIED POLYMER SCIENCE
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2021
·Vol. 139
·期 12
·51827
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IF 3.125
Yuan Li,Lu Zhang,Fayong Li,Ke Wang,Xiaoru Wu,Hailu Liu,Bibo Long,Yang Zhao,Dong Xie,Junjia Chen
The hydrophobic modification of cellulose nanofibers (CNF) was carried out via free radical polymerization using methyl methacrylate (MMA) as the monomer to improve the compatibility between CNF and poly lactic acid (PLA). Followed by the preparation of the novel nanocomposites in combination of the organic montmorillonite and the substrate. The resulting nanocomposites were then coated on paper surface using a cast-coating process in an attempt to improve the barrier properties towards water vapor and oxygen. In addition, the composite films are prepared via a solution casting method. The water vapor transmission rate (WVTR), water vapor permeability (WVP), oxygen transmission rate (OTR), and tensile strength of the as-prepared films were systematically measured. The corresponding results demonstrated that the WVTR, WVP and OTR decreased with the addition of a certain content of MCNF in coatings. 0.2 wt% MCNF is the optimum content, showing the best gas resistance and tensile performance. The lowest value of WVTR and WVP are 10.30 g/(m 2 ⋯24 h) and 3306.58 g⋯μm/(m 2 ⋯24 h) for films with 0.2 wt% MCNF added, which is 88.23% and 26.05% lower than that of PLA composite film without NFC.
研究领域:
高分子材料
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纳米复合材料
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包装材料
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表面涂层
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生物基材料
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ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
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2026
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IF 6.6
Fachao Li,Jiale Zhang,Bingyu Duan,Jiaxin Shi,Xiaotong Wang,Fanlong Kong,Shuo Li
Co-present mineral colloids affect the transport and distribution of microplastics (MPs) in porous media, however, the transport mechanism remains unclear. In this study, the combined effects of montmorillonite and goethite colloids on the transport/retention behavior of MPs in porous media were investigated. The results show that the type of mineral colloids affects the transport and deposition behavior of MPs in porous media. The coexistence of mineral colloids at an equal ratio promotes MPs transport, while excessively high concentrations of either goethite or montmorillonite colloids inhibit MPs transport. Coexisting mineral colloids promote the transport of MPs in coarse sand media, while play an inhibitory role in medium/fine sand media. Divalent cations reduce MPs fluidity through charge shielding and heteroaggregate formation and the inhibition ability is much higher than that of monovalent cation. Co-present mineral colloids exert an inhibitory effect on MPs transport under acidic and alkaline conditions. The high flow rate promoted the penetration of MPs and induced their deep retention through the fluid drag force. The selective adsorption of coexisting mineral colloids on natural river sand may be a key interface mechanism for regulating transport. These results provide new insights into the theory of colloid-MPs cotransport in groundwater systems.
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NEW JOURNAL OF CHEMISTRY
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2026
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IF 2.6
Yijing Li,Xiaogang Luo,Piaowen Yang,Jian Xiao,Zhaoyan Chi
The effective removal of trace trimethoprim (TMP) from aquatic environments remains a significant challenge due to the limited efficiency of conventional adsorbents at low concentrations. In this study, a novel composite adsorbent, MMT/CMCBS, was successfully fabricated by incorporating montmorillonite (MMT) into a carboxymethylated cellulose (CMC) matrix through an optimized extrusion-dropping method. The structural and chemical properties of the beads were systematically characterized using FESEM-EDS, FT-IR, XRD and XPS revealing a stable macroporous structure (≈1.5 mm diameter) with well-dispersed MMT. Fixed-bed column experiments demonstrated that MMT/CMCBS exhibits exceptional performance for TMP removal, achieving a removal efficiency of 99.874% and maintaining over 90% performance after four regeneration cycles. The breakthrough curves were well-described by the Adams-Bohart models (R2 > 0.94), indicating favorable dynamic adsorption behavior. Mechanism analysis further revealed that the synergistic removal of TMP was driven by hydrogen bonding and chemisorption between the TMP molecules and the functional groups of the composite. This study provides a highly efficient, stable, and environmentally friendly strategy for the elimination of TMP from water, offering significant potential for continuous-flow water treatment.
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BIOMASS & BIOENERGY
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2026
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IF 5.8
Meiling Zhang,Hui Wen,Jianhao Shao,Xupin Zhuang,Zhangang Wang
In this study, banana nanocellulose/montmorillonite aerogel acts as support material and by vacuum impregnation paraffin conducts as latent heat storage material to prepare a shape-stabilized phase change composite. The microstructure, functional groups, and crystallinity of the samples were determined by SEM, FTIR, and XRD. The thermal storage and thermal cycling properties of the samples were measured by DSC, and the thermal conductivity was measured by thermal constant analyzer. The ΔH m /ΔH c values of CMP are 93.9–96.3 % and 91.9–97.4 % of paraffin. There is no obvious leakage of the composite after heated at 80 °C for 1 h. The temperature of the composite can reach 83.5 °C under an intensity of 150 mW/cm 2 simulated sunlight and the heat release time without sunlight can reach 8 h. The composites prepared have excellent shape stability, thermal conductivity, and photothermal conversion efficiency, which can achieve efficient thermal energy storage and long-term thermal energy release. At the same time, this work provides reference value for the resource utilization of banana wasted stem.
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Journal of Environmental Sciences
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2026
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IF 6.5
Haohan Yang,Hanyu Jiang,Hao Xing,Zhankun Chen,Qi Zhang,Zhenhua Yan
Minerals modulated the multi-level bioavailability of CIT in D. magna . • Illite caused severe damages to the digestive system at 100 μg/L-CIT. • Montmorillonite obviously aggravated the oxidative stress of CIT. • Sensitive responses of feeding and swimming behaviors were observed. The impacts of water conservancy projects on the ecological risk of pollutants have raised intensive concerns in recent years. The widespread occurrence of antidepressant citalopram (CIT) could pose potential threats to the aquatic non-organisms and even human health. However, information regarding the bioavailability of CIT in the presence of suspended minerals is still limited. In this study, the driving mechanism of kaolinite, montmorillonite (Mon), and illite on the multi-level bioavailability of CIT was investigated in Daphnia magna . Corresponding to the inhibition of feeding behavior, the CIT-associated minerals in the gastrointestinal tracts caused severe cell swelling, cavitation and microvilli degeneration, especially for CIT+illite group. All co-exposure of minerals and CIT significantly alleviated the cellulase activity, while kaolinite further aggravated the inhibition of CIT on trypsin activity at 100 μg/L. Decreased CIT body burden, swimming activities were observed in the presence of three minerals at 10 μg/L, whereas no remarkable function at 100 μg/L. Sensitive oxidative stress was observed for CIT+Mon group with significant increase of reactive oxygen species, total antioxidant capacity, catalase as well as the inhibition of catalase and glutathione S-transferase genes expression. Illite obviously aggravated the biological effects of CIT at both concentrations, whereas Mon was effective only at low concentrations with the most limited action of kaolinite. The feeding and swimming behaviours of D. magna represented the comprehensive stress response among the correlation of biomarkers. The rapid and extensive release of CIT from minerals in gastrointestinal fluids indicates the critical role of secondary release in modulating its bioavailability. Download: Download high-res image (357KB) Download: Download full-size image
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Journal of Macromolecular Science Part B-Physics
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2026
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IF 1.7
Zheng Wei,Chaopeng Zhao,Long Zhang,Rui Chen,Dizhi Liu,Huadong Fu,Yan Qin
Sprayable polyurethane elastomers integrate outstanding mechanical properties with excellent adhesion, enabling firm bonding to diverse materials such as metals. However, their inadequate high-temperature resistance and inherent flammability restrict their application in extreme environments. This study incorporated silica (SiO2) and montmorillonite (MMT) to optimize the compatibility between inorganic ceramic particles and the polymer matrix. Titanium boride (TiB2) and silicon carbide whiskers (SiCw) were employed as ceramicized fillers, with aramid pulp added as a dispersion-strengthening phase, successfully developing a ceramicizable polyurethane-based thermal insulation material. The results demonstrated that when both TiB2 and SiCw were added at 1.2 g, the composite achieved optimal comprehensive performance: tensile strength increased from 5.14 MPa to 6.34 MPa, mass retention at 1000 °C reached 30.50%, and after oxygen-acetylene ablation testing, the linear ablation rate was 0.180 mm/s with a mass ablation rate of 0.0706 g/s. Multiple characterization revealed that graphitic carbon derived from polyurethane pyrolysis, molten SiO2 at elevated temperatures, and oxidation decomposition products of TiB2 (such as TiO2 and B2O3) collectively formed a multi-phase ceramic-glass composite. This composite effectively fills voids generated in the material under high-temperature conditions, densifies the carbon layer structure, and significantly enhances the ablation resistance of polyurethane elastomer thermal insulation materials.
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JOURNAL OF SOILS AND SEDIMENTS
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2026
·Vol. 26
·期 4
·124
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IF 3.3
Zhou Jiawen,Gao Ting,Sun Yufang,Zeng Zhen,Christie Peter,Luo Yongming,Wu Longhua
Purpose Cadmium (Cd) isotope fractionation related to various components in soils provides useful information on Cd biogeochemical behaviour in the natural environment. Existing studies focus solely on Cd isotope fractionation during adsorption on environmentally relevant surfaces (e.g., clay minerals) but poorly document Cd isotopic variation during desorption, particularly in the case of partial desorption. Studying Cd isotopic behaviour during adsorption–desorption on clay minerals and soil benefits Cd fate tracing. Materials and methods Here, Cd isotope fractionation during adsorption–desorption was investigated on kaolinite and montmorillonite at different solution pH and initial Cd concentrations, and in an albic soil rich in clay minerals but low in organic matter and iron-manganese oxides. In addition, the clay particle fraction (< 2 μm) of the albic soil was also separated and used for adsorption–desorption experiment and isotopic analysis. Results and discussion Solution pH and Cd concentration significantly affected Cd adsorption at different sites and Cd desorption rate on the surfaces of the two clay minerals but led to negligible Cd isotope fractionation during adsorption and desorption. This strongly suggests similar Cd isotope fractionations induced by the two different adsorption sites on the clay minerals. Negligible isotope fractionation was also observed during adsorption or desorption in the albic soil and its clay particle fraction (< 2 μm; Δ 114/110 Cd adsorption = − 0.07 to − 0.06‰ and Δ 114/110 Cd desorption = − 0.08 to − 0.05‰). Cadmium adsorption on montmorillonite which dominated Cd adsorption on the soil studied and the clay particle fraction is suggested as the explanation for the negligible Cd isotope fractionation during soil adsorption and desorption. Conclusions This work provides preliminary data on Cd isotope fractionation during adsorption and desorption in actual soils with multiple reactive surfaces and indicates that the contribution of kaolinite and montmorillonite to Cd isotope fractionations during adsorption/desorption in soils may be neglected, and in some clay-rich soils ion exchange may not lead to significant Cd isotope fractionation. Graphical abstract
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APPLIED CLAY SCIENCE
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2026
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IF 5.2
Jing-Yao Xiao,Lei Huang,Shi-Xiang Xiong,Jian-Feng Lan,Ru-Xin Chen,Long-Long Jin,Ze-Chao You,Bai-yi Chen,Xian-Hui Zhang
Poly (vinyl alcohol) (PVA) films are limited by their low thermal stability and inherent flammability. In this work, a synergistic surface modification of montmorillonite (MMT) was achieved using phenyltriethoxysilane (PTES) and isopropyl tri (dioctyl pyrophosphate) titanate (IPPTO) to produce co-modified nanofillers (IPMMT) that are uniformly dispersed within PVA, forming a hierarchical porous network. The dual modification transforms MMT from a slit-like structure into a mesoporous architecture while enhancing interfacial bonding via Si–O–C/Si–O–Si and Ti–O–M linkages. Compared with pristine PVA, the IPMMT–PVA nanocomposite exhibits dramatically improved thermal performance: the char yield exceeds 40% at 600 °C in air (vs. ∼1% for PVA), Td 20 rises from 293 °C to 377 °C, Td 30 from 312 °C to 506 °C, and the maximum mass-loss rate decreases by more than an order of magnitude. Infrared thermography further confirms superior heat-shielding capability, with the time to reach 200 °C prolonged to 52 s—an increase of 372.8% relative to pure PVA. Mechanistically, phenylsilane grafting enhances polymer stability below 300 °C and constructs low mesopores that confine volatile degradation products, while titanate modification yields in situ TiO 2 above 600 °C, forming an inorganic barrier and promoting char densification. This cooperative silane–titanate strategy provides an environmentally friendly route to high-performance, thermally insulating, and flame-retardant PVA materials.
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POLYMER DEGRADATION AND STABILITY
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2026
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IF 8.1
Kai Yan,Jingyao Xu,Shuilai Qiu
Sodium-ion batteries are prone to thermal runaway due to metal dendrite growth and structural stability defects, posing safety hazards. This study proposes a multi-component synergistic flame retardant and ceramization strategy, preparing a PDMS-based foam composite by introducing multi-component synergistic fillers. The material exhibits excellent comprehensive properties: after continuous burning at 1100°C for 60 minutes, the backside temperature only rises to 200°C, forming a dense ceramic layer that effectively blocks heat and oxygen transfer. The material exhibits low thermal conductivity, thereby demonstrating superior thermal insulation performance. The compression modulus is 25 kPa, and it can withstand 1000 cycles of 60% strain compression without significant stress decay, highlighting its excellent mechanical flexibility. Cone calorimetry tests show that its peak heat release rate (PHRR) is reduced by 41% compared to pure PDMS, total heat release (THR) is decreased by 27.7%, and total smoke production (TSP) is reduced by 66.9%, indicating excellent flame retardant and fireproof performance. Microscopic analysis reveals that multi-component fillers synergistically react at high temperatures to form a triple protection mechanism of "glass phase-crystalline phase-porous structure". This material provides a new solution for thermal runaway protection of sodium-ion batteries and has broad application prospects in energy storage power stations, new energy vehicles, and other fields.
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RSC Advances
·
2026
·Vol. 16
·期 14
·12927-12933
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IF 6.1
Pengfei Chen,Junfeng Qian,Qun Chen,Xuan Dai,Mingyang He
The phosgene-free synthesis of methylene diphenyl diisocyanate (MDI) from dimethyl carbonate (DMC) involves the acid-catalyzed condensation of methyl N-phenylcarbamate (MPC) with formaldehyde (HCHO) to produce methylene diphenyl carbamate (MDC). This study investigates the catalytic properties of a commercial acidic clay (HM-X), with a focus on its acidity and Brønsted/Lewis (B/L) balance. Characterization by XRD, N2 adsorption, NH3-TPD, and pyridine-IR shows that HM-X has a high density of medium and strong acid sites, with a notable Brønsted component. Under certain reaction conditions in DMC with co-fed water, HM-X achieved an 88.1% MDC yield at 90 °C after 6 hours. However, excessive acidity promoted side reactions, decreasing MDC selectivity. These findings highlight the importance of optimizing Brønsted and Lewis sites to balance activity and selectivity, providing insights for designing efficient, recyclable solid acids for sustainable, phosgene-free MDI production.
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APPLIED CLAY SCIENCE
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2026
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IF 5.2
Nan Liu,Xu Zhang,Xuemei Sun,Na Meng,Bingnan Du
Traditional wound dressings lack antibacterial properties and may cause wound damage during dressing changes, impairing healing. Therefore, single-function dressings cannot meet the multifaceted requirements of modern wound healing processes. This study successfully prepared a Cu 2 O/PDA-MMT by loading cuprous oxide nanoparticles (Cu 2 O NPs) onto polydopamine (PDA)-modified montmorillonite (MMT), which was then incorporated with chitosan (CS)/polyvinyl alcohol (PVA) via a one-step blending method to fabricate CS/PVA/Cu 2 O/PDA-MMT hydrogels. Characterization techniques including XRD, FTIR, TG, and SEM confirmed the successful preparation of the material, while systematic evaluation demonstrated its physicochemical properties such as gel fraction, porosity, and mechanical performance. Antimicrobial experiments, cell compatibility tests, mouse tail-amputation hemorrhage models, and full-thickness skin wound infection models demonstrated that the 1% CS/PVA/Cu 2 O/PDA-MMT hydrogel not only exhibited over 95% antimicrobial inhibition rates against both test bacterial strains but also possessed excellent biocompatibility. It significantly reduced blood loss in rat tail hemorrhage models. When treating full-thickness skin wounds, this hydrogel effectively controlled infection, accelerated healing, achieved a wound healing rate exceeding 97% by day 12, and promoted tissue regeneration. These outstanding properties position it as a wound dressing material with significant clinical application potential.
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BioNanoScience
·
2026
·Vol. 16
·期 9
·569
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IF 4
Wu Weijun,Yao Zhiyong,Ling Lei,Chen Kai,bi Chen Zhong,Xu Xiaoguang,Tao Yun,Wu Dingsheng,Feng Quan
Poly-L-lactic acid (PLLA) fibrous materials have been widely applied in biomedical and packaging fields due to biodegradability and biocompatibility. However, practical use is often restricted by inherent drawbacks such as poor antibacterial activity, high brittleness and inferior hydrophilicity. This study prepared PLLA/O-CUR composite nanofiber membranes by incorporating curcumin-loaded organically modified montmorillonite (O-CUR) into a PLLA matrix to overcome these limitations. The structure and morphology of the resulting membranes were characterized using FTIR, XPS, EDS and SEM. The results demonstrated remarkable enhancement in mechanical properties, with elongation at break increased by 200%, along with significantly improved hydrophilicity, evidenced by a water contact angle of 43°. Furthermore, the resultant nanofiber membrane achieved a 100% bacterial inhibition rate against Staphylococcus aureus ( S. aureus ) and Escherichia coli ( E. coli ), showing complete suppression of bacterial proliferation. The enhanced performance is attributed to the synergistic effect between the natural antibacterial property of CUR and the layered structure of modified MMT. Moreover, the nanofibrous membrane undergoes progressive degradation within 64 days in PBS and within 35 days in soil, achieving synergistic integration of functionality and biodegradability. This work presents a feasible strategy for developing multifunctional PLLA-based materials, demonstrating promising potential for use in active food packaging, wound dressings, and antimicrobial textiles.
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