CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2024
·
IF 3.1
Xu Dejun,He Liu,Zeng Fudong,Liu Bo,Ma Jinli,Han Dongmei,Yang Qingbiao,Du Jianshi
Polyvinylpyrrolidone-iodine (PVP-I) complexes are widely used in the medical and health field due to its strong antimicrobial properties and good biocompatibility, but their water solubility negates the possibility to be used as a wound dressing. In this work, the problem of PVP dissolving in water was solved by the method of thermally crosslinking, and it was found that the thermally crosslinked PVP nanofiber heated at 170 °C for 6 h had good liquid absorption capacity, stability and good fiber morphology. In addition, the thermally crosslinked PVP nanofiber is complexed with I 2 to endow it with excellent antibacterial properties. It has been demonstrated to have good biocompatibility through cytotoxicity and hemolysis experiments, which provides the possibility for it to be a dressing for the treatment of infectious wounds.
研究领域:
材料科学
·
生物医学工程
·
纳米技术
·
药剂学
✓ 已验证
产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2024
·
IF 8.5
Jiawen Li,Yifeng Sun,Wangjue Shi,Yang Li,Yucheng Zou,Hui Zhang
In this work, the electrospun short fiber-based oleogels (ESF O) were formed by thermal crosslinking. Gelatin and gluten nanofibers were obtained via electrospinning, then homogenized and transformed into short fiber dispersions. Through freeze-drying, electrospun short fiber-based aerogel (ESF-A) templates were obtained for oil adsorption. All ESF-A exhibited the micromorphology of loose fibrous pore structure and prominent changes of characteristic peaks in the thermal and infrared analyses. Moreover, the highly crosslinked templates owned excellent hydrophobicity and mechanical performances (elastic modulus: 0.25 kPa, yield strength: 14.56 kPa, compressive strength: 52.54 kPa, and the final compression recovery: 91.27%). Meanwhile, the oil adsorption/oil holding capacity could reach 76.56 g/g and 80.04%, respectively. Through thermal crosslinking, ESF-O presented good and controllable rheological/in vitro digestion properties, which were further confirmed by PCA analysis. According to different application conditions, ESF-O properties could be adjusted by different degrees of fiber addition or thermal crosslinking.
研究领域:
材料科学
·
食品科学
·
生物技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMER DEGRADATION AND STABILITY
·
2025
·
IF 7.4
Yao Yan,Zuanxin Yang,Songming Chen,Rong Yang
The flame-retardant modification of polymers, while preserving or enhancing their mechanical properties, is critical for engineering plastics. In this study, we develop flame-retardant polycarbonate (PC) composites with improved mechanical performance by incorporating cinnamate-containing liquid crystalline copolyester (CLCP). During the injection molding process, CLCP forms oriented microfibrils in situ, boosting the tensile strength of the composites by up to 66 %. The cinnamate groups in CLCP undergo radical-initiated thermal crosslinking, which increases melt viscosity, prevents dripping, and achieves a UL-94 V-0 rating. The primary flame retardancy mechanism occurs in the condensed phase: early decomposition of CLCP triggers thermal crosslinking, leading to the formation of a dense, graphitized char layer that reduces the peak heat release rate (PHRR) by 46.8 %, total smoke production by 17.9 %, and increases the limiting oxygen index (LOI) to 32.5 % (compared to 27.0 % for neat PC). This dual-functionality of CLCP addresses both the flammability and mechanical limitations of PC, making it a promising candidate for engineering applications requiring high-performance materials. This work introduces a novel molecular design strategy, integrating liquid crystallinity and cinnamate crosslinking, to enhance both flame resistance and mechanical properties in engineering plastics.
研究领域:
材料科学
·
高分子工程
·
消防安全工程
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2020
·
IF 8.247
Li Zhang,Xingxing Jiao,Zhenhe Feng,Bing Li,Yangyang Feng,Jiangxuan Song
Although silicon is one of the most prospective alternatives with ultrahigh theoretical capacity, its significant intrinsic volume changes seriously restricts its practical applications. Herein, a water-soluble polymer binder with a three dimensional (3D) network is exploited for stable silicon (Si) anode via in-situ thermal cross-linking of xanthan gum (XG) with polyacrylamide (PAM). Moreover, the cross-linked structure of c-XG-PAM gel binder with hydroxyl groups and amide groups remarkably enhances the adhesion on silicon and Cu current collector. As a result, the c-XG-PAM binder offers appealing electrochemical performance for SiNP electrodes (1104 mAh g −1 after 1000 cycles) and SiC electrodes (stabilizing for over 400 cycles). The gel polymer binder provides a prospective avenue for pursuing the elongated cycling life of high capacity battery electrodes.
研究领域:
材料科学
·
电化学
·
能源存储
·
高分子化学
·
纳米材料
·
电池技术
✓ 已验证
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2020
·
IF 4.551
Tianjiao Wang,Hongyan Yao,Ningning Song,Yanchao Yang,Kaixiang Shi,Shaowei Guan
In recent years, linear polyimides of intrinsic microporosity have been widely used in the field of gas adsorption and separation because of their high BET surface area and microporous structures. Most of the microporous structures come from the twisted main-chain structures in the linear polyimides of intrinsic microporosity. Therefore, most linear polyimides (PI) without twisted structure have no porosity. Herein, to construct the linear polyimide with microporous structure, a sequence of microporous polyimides (PIs-CL) were constructed from the flexible linear polyimide precursors through the thermal crosslinking reaction. The polyimide precursors without twisted structure were synthesized from a well-designed diamine TFVBPA with cross-linkable ethynyl groups and several commercial dianhydrides (ODPA, BPDA, PMDA and 6FDA) by polycondensation to research the influence of the main-chain structure on the porous characters. The introduction of crosslinked structures gives the linear crosslinked polyimides (PIs-CL) with porous structures. The PIs-CL show obviously improved porosity (0.52–1.71 nm) and higher BET surface area (337–618 m 2 g −1 ) than those of the uncrosslinked polyimides (PIs). Moreover, PIs-CL have favorable CO 2 adsorption (5.7–9.3 wt%) as well as good CO 2 /N 2 selectivity (34.4–58.5) at 273 K, which are better than other polyimides materials. The introduction of crosslinked structures is an effective way to improve microporous porosity and gas sorption performance.
研究领域:
材料科学
·
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Yankang Deng,Miaomiao Zhu,Tao Lu,Qingwei Fan,Wenjing Ma,Xiaoli Zhang,Long Chen,Huihua Min,Ranhua Xiong,Chaobo Huang
Air pollution has seriously affected human health and the atmospheric environment. Preparation of fiber membrane with hierarchical structure provides an advanced method for high-performance air filtration. However, indistinctive secondary structure and complicated preparation present constantly in the formation of fiber with hierarchical structure, inevitably limited in the application of air filtration. In this work, a typical granular-convex structure was created in the surface of thermal-crosslinked sodium phytate/polyvinyl alcohol (T-PANa/PVA) fiber via green preparation. Unique secondary structure endowed fiber with efficient physical interception and polar adsorption, which exhibited excellent the removal of air pollutants (removal of PM 2.5 high than 99.9% while low air resistance of 36.5 Pa). In addition, due to the exist of crosslinked network, T-PANa/PVA fiber membrane expresses water-resistant and mechanical properties . This work provides a positive strategy to fabricate hierarchical fiber membranes via green preparation for high-performance air filtration, which is expected to substitute traditional air filtration materials and adapt to the sustainable development of future.
研究领域:
环境科学
·
材料科学
·
纳米技术
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2024
·Vol. 59
·期 45
·20929-20943
·
IF 3.5
Ye Cai,Li Xiaohong,Chen Jianjun,Hafsa
Crosslinking is a crucial step to keep fibrous morphology and improve ceramic yield in the fabrication process of SiC fibers. Comparing with the oxygen crosslinking, thermal crosslinking can reduce the introduction of oxygen within fibers. In this study, a novel method for preparing the SiC fibers was proposed by combining dry spinning and thermal crosslinking. The spinning solution was prepared by blending a low-molecular-weight (~ 1000 Da) polycarbosilane (PCS) with polyisobutene (PIB) as spinning additive, acrylic acid (AA) as crosslinking agent, and 2,2'-Azobis (2,4-dimethyl) valeronitrile (ABVN) as initiator. The crosslinking mechanism, morphology, composition and microstructure, and mechanical properties of fibers were investigated. The results showed that the morphology of AA-containing PCS fibers was well preserved at 300 ℃ with a low heating rate (0.5 ℃/min), while PCS fibers without AA exhibited the melting or deformation. The crosslinking reaction between C = C groups in AA-containing PCS and Si–H bonds in PCS was triggered by ABVN. Furthermore, AA-containing PCS green fibers experienced pyrolysis at 1100 ℃ and then were annealed at 1500 ℃ (denoted as SiC-1500). SiC-1500 fibers, with an average diameter of 10.47 ± 0.50 μm and average tensile strength of 1.35 ± 0.65 GPa, have a smooth surface and relative dense structure. But SiC-1500 fibers were still an amorphous structure due to the suppression of graphite phase for the growth of β-SiC grains. This work not only breaks through the limitations that only uses high-molecular-weight PCS for dry spinning, but also successfully combines dry spinning and thermal crosslinking technology to obtain SiC fibers. Graphical abstract
研究领域:
材料科学
·
陶瓷学
·
纤维科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Xiujuan Zhang,Zelin Liao,Xinlu Zhang,Xuehua Ruan,Hao Gong,Xiaokun Wang,Wenji Zheng,Yan Dai,Gaohong He
Excellent hemocompatibility and long-term stability against blood wetting are important properties required for artificial lung membrane, the core component in extracorporeal membrane oxygenator which is life-saving for patients with severe lung dysfunctions. Herein, novel hydrophilic modified polyethersulfone (PES) asymmetric membranes were synthesized via thermal cross-linking, and characterization via SEM, FTIR, 1 HNMR and surface water contact angle measurements demonstrated that the modified asymmetric membranes composing a dense layer with hydrophilic surface on top of a microporous support layer were successfully fabricated without any observed defects. Among all the modified membranes, PEGylated PES membrane exhibited the smoothest membrane surface, improved mechanical property, good gas permeability and the best performance in hemocompatibility in terms of blood coagulation, protein adsorption and platelet adhesion. Moreover, the PEGylated PES membrane showed excellent long-term stability in membrane surface wettability as well as long-term stable performance against blood fouling and wetting. This research work provides valuable insights and new idea into synthesizing membranes, with simple synthesis process, long lasting high hemocompatibility and stability against wetting, for application as artificial lung membranes.
研究领域:
材料科学
·
生物医学工程
·
膜技术
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2018
·Vol. 10
·期 12
·1393
·
IF 2.935
Jie Cao,Jianbei Zhang,Yuejun Zhu,Shanshan Wang,Xiujun Wang,Kaihe Lv
The pollution of water resources has become a worldwide concern. The primary pollutants including insoluble oil, toxic dyes, and heavy metal ions. Herein, we report a polymer adsorbent, named SPCT, to remove the above three contaminants from water simultaneously. The preparation process of SPCT contains two steps. Firstly, a hydrogel composed of sulfonated phenolic resin (SMP) and polyethyleneimine (PEI) was synthesized using glutaraldehyde (GA) as the crosslinking agent, and the product was named SPG. Then SPCT was prepared by the reaction between SPG and citric acid (CA) at 170 °C. SPCT exhibited an excellent performance for the removal of methylene blue (MB) and Cu(II) from aqueous solution. For a solution with a pollutant concentration of 50 mg L−1, a removal efficiency of above 90% could be obtained with a SPCT dosage of 0.2 g L−1for MB, or a SPCT dosage of 0.5 g L−1for Cu(II), respectively. SPCT also presented an interesting wettability. In air, it was both superhydrophilic and superoleophilic, and it was superoleophobic underwater. Therefore, SPCT could successfully separate oil-in-water emulsion with high separation efficiency and resistance to oil fouling. Additionally, SPCT was easily regenerated by using dilute HCl solution as an eluent. The outstanding performance of SPCT and the efficient, cost-effective preparation process highlight its potential for practical applications.Keywords:wastewater treatment;adsorption;emulsion separation;thermal crosslinking;superhydrophilicity
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMER
·
2021
·
IF 4.43
Shuoshuo Wang,Liqiang Yi,Lina Wang,Juming Yao,Jiri Militky,Mohanapriya Venkataramam,Jakub Wiener,Ming Zhang
Stable energy storage materials have become the research focus today. Coaxial electrospinning can prepare core-sheath nanofibers loaded with phase change materials (PCMs). This method requires the sheath solution have good spinnability and encapsulation ability. Suitable solutions can be prepared by the thermal cross-linking method to improve the properties of nanofibers. Choose hexamethylene diisocyanate (HDI) and β-cyclodextrin (β-CD) as cross-linking agents to adjust the performance of polyvinyl butyral (PVB)/N, N-dimethylformamide (DMF) solution. The adjustment of β-CD addition amount and thermal cross-linking time prepared the best sheath solution as PVB/50CD/HDI. The latent heat of nanofibers prepared by using this sheath solution could be as high as 137.05 J/g. In the meantime, the properties of nanofibers in thermal decomposition, mechanical strength , and elongation rate were also improved. The thermal cycle test proved the good stability of core-sheath nanofibers. This work lays the foundation for the further development of temperature-regulating fibers with high latent heat and performance.
研究领域:
材料科学
·
能量存储
·
纳米技术
·
热工程
✓ 已验证
产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2024
·
IF 10.7
Chengkun Liu,Zi Li,Lili Liu,Xianfeng Qu,Zhuang Shi,Zhidong Ma,Xiaoqiang Wang,Fang Huang
Uncontrolled hemorrhage stands as the primary cause of potentially preventable deaths following traumatic injuries in both civilian and military populations. Addressing this critical medical need requires the development of a hemostatic material with rapid hemostatic performance and biosafety. This work describes the engineering of a chitosan-based cryogel construct using thermo-assisted cross-linking with α-ketoglutaric acid after freeze-drying. The resulting cryogel exhibited a highly interconnected macro-porous structure with low thermal conductivity, exceptional mechanical properties, and great fluid absorption capacity. Notably, assessments using rabbit whole blood in vitro, as well as rat liver volume defect and femoral artery injury models simulating severe bleeding, showed the remarkable hemostatic performance of the chitosan cryogel. Among the cryogel variants with different chitosan molecular weights, the 150 kDa one demonstrated superior hemostatic efficacy, reducing blood loss and hemostasis time by approximately 73 % and 63 % in the hepatic model, and by around 60 % and 68 %, in the femoral artery model. Additionally, comprehensive in vitro and in vivo evaluations underscored the good biocompatibility of the chitosan cryogel. Taken together, these results strongly indicate that the designed chitosan cryogel configuration holds significant potential as a safe and rapid hemostatic material for managing severe hemorrhage.
研究领域:
材料科学
·
生物材料
·
止血
·
创伤医学
✓ 已验证
DOI
PubMed
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2021
·
IF 5.455
Tianjiao Wang,Yanchao Yang,Ningning Song,Shiyang Zhu,Hongyan Yao,Yunhe Zhang,Shaowei Guan
In recent years, building microporous polyimides (MPIs) via choosing simple commercial aromatic monomers or concise experimental methods is still an issue worthy to explore. Herein, two cross-linkable aromatic alkynyl monomers (TAPM-PEPA and TAPA-PEPA) were prepared from a commercial alkynyl anhydride PEPA and two aromatic multi-amine TAPM (3D-tetrahedron) and TAPA (near 2D-planar) monomers with different topological structures. The crosslinked polyimides were prepared and endowed microporous features via one-pot thermal crosslinking polymerization in the diphenyl sulfone. The TAPM-PEPA-CL has higher BET surface area and total pore volume (736 m2 g-1 and 0.497 cm3 g-1) than those of the TAPA-PEPA-CL (351 m2 g-1 and 0.358 cm3 g-1). As the topological structure becomes more stereoscopic, CO2 adsorption capacity has been significantly improved from 9.6 wt% to 13.5 wt%. Furthermore, the TAPM-PEPA-CL and TAPA-PEPA-CL have excellent selectivity for CO 2 /CH 4 (12.0–23.6) and CO 2 /N 2 selectivity (54.4–57.6) at 273 K and 1 bar. These results reveal that the introduction of crosslinked structures and control of topological structures have potential application significance for preparing microporous polyimides based on cross-linkable aromatic alkynyl monomers, which is beneficial for the development of the field of gas adsorption and selectivity.
研究领域:
高分子化学
·
材料科学
·
气体分离与吸附
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）