最新刊期
- 摘要：Hydrogels exhibit great application potential in wearable biosensing owing to their excellent biocompatibility and tunable physicochemical properties. However, developing hydrogel sensing materials with integrated excellent mechanical properties, high sensing sensitivity, stable interfacial adhesion and favorable electrical conductivity remains a critical challenge. To address these issues, a flexible sensor based on polyacrylamide/tannic acid/MXene (PAM/TA/MXene, PTM) composite hydrogel is designed and fabricated in this work. In this system, multiple dynamic hydrogen bonds are formed among the phenolic hydroxyl groups of TA, the hydroxyl/oxygen terminals on the MXene surface, and the amide groups of PAM, constructing a reinforced cross-linked network that synergistically optimizes the mechanical properties, adhesion, and electrical conductivity of the material. The PTM hydrogel demonstrates outstanding stretchability (strain > 1200%), high sensitivity (maximum gauge factor (GF) of 0.61), and millisecond-level response/recovery capability; TA endows it with robust adhesion to the skin and various substrates. This sensor integrates high-fidelity monitoring of human body movements and micro-expressions with high-quality acquisition of electrocardiogram (ECG) and electromyogram (EMG) signals, and its signal-to-noise ratio (SNR) in dynamic environments outperforms that of commercial hydrogel electrodes. This study provides a feasible material solution for high-performance wearable sensing systems applied in medical monitoring and human-machine interaction.关键词：Composite hydrogel;Flexible sensor;Bioelectrical signals;MXene;Tannic acid0|0|0更新时间：2026-05-11
- 摘要：Traumatic hemorrhage remains a major clinical challenge, underscoring the urgent need for the development of novel materials that combine excellent hemostatic efficacy with good biosafety. Based on the medicinal potential of Poria cocos alkali-soluble polysaccharide (PCAP) and its gelation potential as a β-glucan, this study utilized the commonly discarded natural polysaccharide PCAP as the raw material to prepare a series of sponges with PCAP concentration gradients of 10–100 g/L via freeze-drying. Based on morphological integrity, 50–100 g/L was identified as the effective formable concentration range. Scanning electron microscopy (SEM) images revealed that the PCAP sponges exhibited a three-dimensional porous structure, while physical performance tests demonstrated favorable water absorption capacity, water retention rate, and water vapor transmission rate. In vitro coagulation and hemolysis experiments confirmed the significant pro-coagulant activity and excellent hemocompatibility of the PCAP sponges. In vivo hemostatic performance evaluated using mouse tail amputation and liver incision models indicated optimal hemostatic efficacy at a PCAP concentration of 70 g/L. Activated partial thromboplastin time (APTT) and prothrombin time (PT) assay indicated that PCAP sponges prolonged APTT and shortened PT, suggesting a dual modulatory effect on both the intrinsic and extrinsic coagulation pathways. Histopathological analysis revealed no significant inflammatory response, indicating good tissue compatibility. These results demonstrate that PCAP-based sponges exhibit favorable comprehensive properties in terms of hemostatic performance, physicochemical characteristics, and biocompatibility. They show potential application value as a natural polysaccharide-based hemostatic sponge dressing, providing a new strategy for developing green and safe hemostatic dressings.关键词：Poria cocos alkali-soluble polysaccharide;Hemostasis;Sponge;Natural polysaccharide0|0|0更新时间：2026-05-11
- 摘要：Experimental teaching plays a crucial role in undergraduate training in polymer science. Integrating cutting-edge academic concepts into experimental teaching serves as an effective approach to enhance students’ comprehensive innovative capabilities. A comprehensive polymer experiment based on the synthesis and performance characterization of donor-acceptor benzodithiophene-based polymers was designed. The experiment mainly employs Stille coupling polycondensation to synthesize conjugated polymers with tunable bandgap characteristics. The thermal stability, absorption spectra, energy levels, and contact angles of the resulting polymers were characterized by utilizing various analytical techniques. By closely integrating synthesis with property characterization, the students can acquire more comprehensive understanding on the core concept of “structure determines properties”, and their research literacy and innovative capability are also further improved.关键词：Experimental teaching;Benzodithiophene;Polymer;Comprehensive experiment;Innovative capability1|0|0更新时间：2026-05-11
- 摘要：Carbon black serves as an irreplaceable reinforcing filler in the rubber industry. The trade-off between its hysteretic behavior and abrasion resistance represents a critical bottleneck limiting the performance of new energy vehicle (NEV) tires. In this work, we synergistically tuned the key parameters of carbon black's intrinsic structure and innovatively developed a theoretical framework for the balanced structural design of carbon black. A low-hysteresis, high-abrasion carbon black (denoted as RX001) was synthesized and incorporated into rubber compounds. Performance characterization results demonstrate that RX001 enables the synergistic enhancement of low heat buildup and high abrasion resistance, with exceptional performance in sustainable formulations: the 60 ℃ tanδ (a proxy for hysteresis) of RX001 is 8.7% lower than that of the commercial foreign benchmark E7 and 10% lower than that of N234; the DIN abrasion loss is reduced by 21.7% (versus N234) and 15.3% (versus E7); the Akron abrasion volume is decreased by 25.0% (versus N234) and 33.3% (versus E7), respectively. RX001 features abundant microcrystalline structures and a rough topological morphology, which remarkably strengthens the interfacial bonding interaction between carbon black and rubber, thus achieving the synergistic enhancement of low heat build-up and high abrasion resistance properties.关键词：Carbon black;Low hysteresis;High abrasion;Rubber;Balanced structural design0|0|0更新时间：2026-05-11
- 摘要：Poly(lactic acid)/β-tricalcium phosphate (PLA/β-TCP) composite Gyroid porous bone scaffolds were fabricated via a melt compounding–filament extrusion–FDM 3D printing route. The effects of β-TCP content (0 wt%–20 wt%) on mechanical properties, in vitro degradation behavior, and cytocompatibility were systematically investigated. The results show that β-TCP markedly enhances the stiffness and load-bearing capacity of the composites: the tensile strength of printed specimens increased from 52.3 MPa to 74.9 MPa at 15 wt% β-TCP, and the tensile modulus rose from 2.12 GPa to 3.15 GPa, accompanied by a decrease in elongation at break from 6.4% to 2.6%, indicating strengthening with a certain degree of embrittlement. The compressive response exhibits a typical three-stage behavior—elastic region, plateau region, and densification—with both plateau stress and energy absorption increasing as β-TCP content rises. During in vitro degradation, the mass loss after 4 weeks increased from (6.8±0.7)% for PLA to (12.7±1.1)% for the 20 wt% β-TCP composite; meanwhile, β-TCP provided a pronounced buffering effect against acidification, with the immersion medium pH at 4 weeks increasing from 6.62±0.06 (PLA) to 7.15±0.06 (20 wt% β-TCP). Cell studies demonstrate that the composite scaffolds exhibit no evident cytotoxicity and promote cell proliferation: at day 5, the optical density (OD450) values increased from 0.95 (PLA) to 1.10–1.15 for the 10 wt%–15 wt% β-TCP groups, and live/dead staining showed predominantly viable cells with good spreading. Overall, a β-TCP content of 10 wt%–15 wt% provides an optimal balance among mechanical performance, degradation behavior, and biological response, offering a promising strategy for the design of biodegradable bone repair scaffolds.关键词：Poly(lactic acid);β-Tricalcium phosphate;3D printing;Porous bone scaffold0|0|0更新时间：2026-05-11
- 摘要：As one of the most promising bio-based and biodegradable polymers for industrialization, supercritical fluid foaming technology using poly(lactic acid) (PLA) has emerged as a key pathway for achieving lightweight and functional applications. Recent research progress on supercritical fluid (primarily supercritical CO2, scCO2) foamed PLA materials is systematically reviewed, with focus on three core directions: bulk modification strategies, formulation compounding technologies, and foaming process innovations. By summarizing representative research findings and integrating the current application status of foamed PLA, this review analyzes the existing technical bottlenecks and outlines future development trends, providing theoretical support and practical guidance for the development of high-performance biodegradable foam materials.关键词：Poly(lactic acid);Supercritical fluid foaming;Biodegradable polymers14|0|0更新时间：2026-05-09
- 摘要：Cycloaddition of carbon dioxide (CO2) and epoxides can boast 100% atomic economy, and it is considered an up-and-coming method for CO2 utilization. However, the need for harsh reaction conditions presents a significant challenge. This study addresses this issue by successfully preparing the cellulose-supported ionic liquid as a porous catalyst (PPCIL) via the reaction of allyl cellulose ether (AHP-cellulose) and vinyl imidazolium bromide ([VPIM]Br). The catalytic activity of PPCIL was thoroughly investigated. It was found that end epoxides with small-sized substituents such as epichlorohydrin, epibromohydrin, and propylene oxide, can be completely converted to corresponding carbonates over PPCIL at 80 °C and 0.1 MPa. When the temperature rose to 100 °C, PPCIL also revealed good catalytic activity towards end epoxides with larger size such as allyl glycidyl ether and styrene oxide. PPCIL can effectively activate the CO2 and epoxy substrates, and potential reaction mechanisms were proposed. Notably, PPCIL demonstrated high catalytic activity even after being recycled for five times, maintaining a yield of 88.5% and a selectivity of 98%. In summary, this study offers an effective strategy for heterogenizing ionic liquids for catalytic activation CO2 to cyclic carbonates under mild conditions.关键词：CO2;Ionic liquids;Cellulose modification;Porous catalyst325|14|0更新时间：2025-03-12
- 摘要：Polymer-based fibrous filtration materials are widely used, however, the development of high-temperature filtration application using engineering thermoplastics are limited by the difficulty of wet spinning and fiber refinement. In this paper, a nanofibrous membrane was prepared by electrospinning using the high performance engineering polymer polyetherketoneketone (PEKK), which can be dissolved in trifluoroacetic acid. And the regulation laws of the fiber diameter and morphology were investigated, as well as its characteristics for high temperature filtration application. The study shows that: the average diameter of the fiber can be refined to 87 nm, the pore size of the fiber membrane can be reduced to 293 nm, and the tensile strength can reach 7.77 MPa; the fiber membrane shows excellent filtration performance with the filtration efficiency of higher than 99.9% at a thickness of 6 μm; the fiber membrane maintains a good morphological structure, force, thermal properties, and high-temperature air filtration properties at 300 °C.关键词：Polyetherketoneketone;Electrospinning;Nanofiber;high temperature204|8|0更新时间：2025-03-12
- 摘要：Introducing cutting-edge science and technology into undergraduate experiment teaching has become one of the trends of education reform in colleges and universities. As a new manufacturing technology, photocuring 3D printing shows good application value in polymer material field. In terms of biomedical materials, 3D printing is used to design and prepare 3D repair materials that are identical or similar to the damaged tissue area of the patient to achieve precision and personalized medicine. Combined with the biomedical characteristics, the school has implemented a designing experiment teaching project themed on 3D printing polymer medical materials, which provided students with a platform of independent learning and practicing. In this study, the photosensitive materials methacrylamide-modified gelatin (GelMA) and polyethylene glycol diacrylate (PEGDA) were light-cured by digital light processing (DLP) 3D printing technology to prepare three-dimensional network hydrogel scaffolds. The printed samples had complete structure and interconnected channels, and their pore size was consistent with the 3D model. The effects of space structure and material formula on the properties of hydrogel scaffolds were analyzed. The results showed that the GelMA-PEGDA hydrogel with three-dimensional network and 500 μm pore size had good mechanical property, swelling behavior, and stability. This designing experiment involved an integration of multidisciplinary knowledge, which not only brought a novel teaching experience for teachers and students, but also provided a new idea for the training of innovative talents.关键词：3D printing;Polymer material;Photosensitive material;Hydrogel;Designing experiment549|42|0更新时间：2024-03-11
- 摘要：“Polymer surface(interface) adsorption” is an important component of the polymer surface and interface chapter in Polymer Physics teaching. It is related to the preparation of polymer composite materials, colloid stability, wastewater treatment, life systems, and many other fields involving the adsorption of macromolecules on the surface(interface), with important theoretical and practical significance. In order to improve undergraduate students' understanding of the phenomenon of polymer surface(interface) adsorption, this article proposes to start from the single molecule level and display the two-dimensional diffusion motion of polymer single chains on the surface(interface) observed in scientific research. By introducing vivid examples, the "adsorption-diffusion-desorption" dynamic model is explained to help students clarify the molecular mechanism of the "polymer surface(interface) adsorption" process. It is essential for students to apply correct thinking in polymer physics to solve practical problems related to polymers by compensating for the lack of dynamic thinking in the learning process, highlighting the philosophical thinking of the movement of all things, and cultivating correct worldviews and methodologies.关键词：Polymer surface(interface) adsorption;Dynamics;Single molecule tracking394|29|0更新时间：2024-03-11
- 摘要：Phase transition theory and phase diagrams are essential but challenging topics in polymer physics courses. This paper provides supplementary and extended derivations of phase equilibrium for polymer blends found in typical polymer physics textbooks and presents a novel method for analyzing phase equilibrium in multi-component complex systems. This approach helps students to deepen their understanding of the underlying logical relationships in phase transition theory, and to bridge the gap between theoretical knowledge in textbooks and practical research.关键词：Polymer blends;Phase equilibrium;Free energy;Chemical potential599|46|0更新时间：2024-03-11
- 摘要：The recycling process of waste polyester/cotton fabrics presents an enormous challenge due to a considerable quantity of waste, the intricate methodology and the minimal value of reused mixed products. The synergistic effect of citric acid and zinc chloride is utilized to effectively break cotton fibers while investigating the underlying mechanism of separation. By employing a concentration of 30% citric acid, 35% zinc chloride, a temperature of 90 ℃, and 3 hours, successful separation between polyester and cotton is achieved. The recovery rate of cellulose attains 84.1%, while retaining its crystalline structure characteristic of cellulose I. However, the degree of polymerization and crystallinity experience a decrease of 83.8% and 27.3%, respectively. Polyester fibers demonstrate a remarkable recovery rate of 97.8%, remaining largely undamaged throughout the separation process. The citric acid and zinc chloride acidolysis system can be recycled several times, enabling the separation and recovery of waste polyester/cotton blended fabrics.关键词：Waste polyester-cotton fabric;Separation;Cellulose;Citric Acid;zinc chloride613|47|0更新时间：2024-03-11
- 摘要：A eco-friendly epoxy emulsifier was synthesized from citraconic anhydride, itaconic anhydride, polyethylene glycol and epoxy resin without catalyst. The aqueous epoxy emulsion was prepared by phase inversion method. The structure and particle size distribution of the emulsifier and emulsion were characterized by 1H-NMR, IR, GPCand laser particle size analyzer. It was found that the emulsion have narrow particle size distribution and excellent stability. The waterborne epoxy coating was prepared with the aqueous epoxy emulsion. The performance and morphology of the coating were characterized using a thermogravimetric analyzer, scanning electron microscopy, and contact angle measurement instrument, and test the conventional performance and corrosiveness of the coating. The results show that the drying time of the waterborne epoxy coating is 20 minutes (surface dry) and 12 hours (solid dry), and the mechanical properties of the coating are excellent. The volatile organic compound (VOC) content is 22 g/L, and it exhibits excellent water resistance (1000 hours) and corrosion resistance (800 hours for neutral salt spray test).关键词：Emulsifier;Epoxy emulsion;Coating;Volatile organic compounds541|42|0更新时间：2024-03-11
- 摘要：The conformation of star comb-like polymer chains in dilute solutions were investigated using Brownian dynamics simulations. The results show that when the grafting density of the star comb-like chains is less than 0.2, the conformation is star-shaped. With the increase of the grafting density, the conformation gradually changes to spherical. In addition, the stretching factor can also better reflect the conformational transition from star to spherical shape. The length of the side chains less influences the stiffness of the star comb-like chain backbone, but its grafting density influences it more. As the length of side chains increases, the persistence length of side chains increases accordingly, but the relative rigidity strength decreases with the increase in side chain length. This paper reveals the relationship between conformation and molecular parameters of star comb-like polymers in dilute solutions, which helps to facilitate relevant characterization studies.关键词：Star comb-like polymers;Chain conformation;Brownian dynamics437|12|0更新时间：2024-03-11
- 摘要：Thin film capacitors are widely used in smart grid, wind power generation, electric vehicle, pulse power system and other fields because of their high power density, low loss, long cycle life, safety and environmental protection. The dielectric is the key to the performance of film capacitors, but the energy storage property of film capacitors is greatly reduced by the leakage current caused by the defects and impurities in the materials at high temperature and high electric field, it is difficult to obtain high energy density in thermally and electrically coupled fields. The introduction of trace organic molecule semiconductor into polymer dielectric can produce energy traps to trap carriers and suppress leakage current, thus reducing conductivity loss and improving charge-discharge efficiency. In this paper, the methods of improving the high temperature energy storage properties of dielectrics by introducing organic molecular semiconductors into polymer matrix are reviewed, the influence mechanism of organic small molecule semiconductor and polymer molecular semiconductor modification on energy storage properties is discussed, and the future development of related fields is prospected.关键词：有机小分子半导体;聚合物分子半导体;复合电介质;泄漏电流;高温储能549|40|0更新时间：2024-03-11
- 摘要：Nowadays, the rapid development of flexible wearable electronic devices, aerospace and other fields has increased the demand for flexible, lightweight electromagnetic interference (EMI) shielding materials, carbon nanotubes/polymer-based composites have attracted much attention because of their good flexibility, light weight, excellent electrical conductivity and mechanical stability, and adjustable EMI shielding efficiency. In this paper, the electromagnetic shielding mechanism is introduced, the dispersion method of carbon nanotubes and the preparation method of carbon nanotubes/polymer-based flexible EMI shielding composites are compared and summarized, and the research progress of carbon nanotubes/polymer-based flexible EMI shielding composites is reviewed. Finally, the key scientific problems to be solved urgently for carbon nanotubes/polymer-based flexible EMI shielding composites are proposed, and their future development trend is prospected.关键词：Carbon nanotubes;Dispersion method;Polymer-based;Electromagnetic interference shielding;Composites459|23|0更新时间：2024-03-11
- 摘要： Phosphorus-based flame retardant epoxy is an important packaging material for 5G communications, smart electronics and semiconductors due to its advantages of high flame retardant efficiency, low preparation cost and small environmental hazards. Based on the performance requirements of high efficiency phosphorus-based flame-retardant epoxy packaging materials, the types and flame-retardant mechanism of phosphorus-based flame-retardant epoxy were introduced, the application of phosphorus-based flame retardant epoxy in electronic packaging was reviewed, and the future development trend was prospected. It was pointed out that the preparation of intrinsic (reactive) phosphorus-based flame retardant epoxy was difficult and the content of available phosphorus was low, it was necessary to further optimize the process and increase the phosphorus content in the packaging system. In contrast, the filled phosphorus-based flame retardant epoxy was the most widely used in electronic packaging due to its simple preparation process, various flame retardants and high phosphorus content.关键词：Phosphorus-based flame retardant;Flame retardant efficiency;Epoxy;Electronic packaging;Flame retardant mechanism385|14|0更新时间：2024-03-11
- Technical support is provided by Beijing Founder electronics co., LTD 京ICP备05002797号-16
京公网安备11010802046898号 - It is recommended to read the content of this site in Chrome&IE9+. Please switch to extreme mode in browser 360.
- Cookies We use cookies to help provide and enhance our service and tailor content. By continuing, you agree to the use of cookies.
0