A5016877368- Organometallic Complex Synthesis and Catalysis
- Synthetic Organic Chemistry Methods
- Carbon dioxide utilization in catalysis
- Bone Tissue Engineering Materials
- Conducting polymers and applications
- Boron and Carbon Nanomaterials Research
- Organic Electronics and Photovoltaics
- Advanced Polymer Synthesis and Characterization
- biodegradable polymer synthesis and properties
- Diamond and Carbon-based Materials Research
- Marine Sponges and Natural Products
- Advanced ceramic materials synthesis
- Polymer composites and self-healing
- Microbial Natural Products and Biosynthesis
- Bone Metabolism and Diseases
- Evaluation Methods in Various Fields
- Probiotics and Fermented Foods
- Collagen: Extraction and Characterization
- Graphene and Nanomaterials Applications
- Spinal Cord Injury Research
- Coordination Chemistry and Organometallics
- Luminescence and Fluorescent Materials
- Energy Load and Power Forecasting
- Microbial Community Ecology and Physiology
- Chemical Synthesis and Analysis
Qingdao University of Science and Technology
2017-2025
China Three Gorges University
2024
Bozhou People's Hospital
2020-2022
Anhui Medical University
2014
First Affiliated Hospital of Anhui Medical University
2014
Quzhou University
2012
Herein, we report a method that significantly enhances the atom economy of catalysts in living polymerization. By introducing intermittent, switchable chain-transfer reactions during polymerization process, multiple regenerations catalyst are achieved while preserving "living"/controlled characteristics. The specially designed catalytic system, composed 1,2-dipyrrolidinoethane/n-butyllithium/n-butylpotassium/toluene, exhibits rate is highly sensitive to temperature. It enables at low...
Abstract Herein, we report a method that significantly enhances the atom economy of catalysts in living polymerization. By introducing intermittent, switchable chain‐transfer reactions during polymerization process, multiple regenerations catalyst are achieved while preserving “living”/controlled characteristics. The specially designed catalytic system, composed 1,2‐dipyrrolidinoethane/n‐butyllithium/n‐butylpotassium/toluene, exhibits rate is highly sensitive to temperature. It enables at...
Even though considerable efforts have been applied toward self-healing materials, construction of a reversible network in nonpolar elastomer with high strength and behavior is still challenge. Herein, novel method to construct dual ionic for natural rubber (NR)-based carboxylate ionomers efficiency through an anionic mechanism demonstrated. Maleic anhydride (MAH) was grafted NR by the first network, n-butyllithium as metallization reagent. Subsequently, zinc dimethacrylate (ZDMA) reacted...
Steric effects play a critical role in the regioselectivity of anionic polymerization butadiene. Bulky Lewis bases hinder 1,4-insertion, favoring 1,2-selectivity, while conformational constraints further enhance this effect.
The incorporation of antibacterial agents into biomaterials is extremely desirable for repairing bone defects. Minocycline, a semi-synthetic tetracycline antibiotic, active against aerobic, anaerobic, Gram-positive and Gram-negative bacteria, can enhance formation, decrease connective tissue breakdown diminish resorption. In this study, novel minocycline-releasing biomaterial was synthesized using biomimetic method. A measured amount an acidic hydroxyapatite minocycline solution respectively...
Multiple chlorine atoms are replaced by low alkoxy blocking ligands, so that the molybdenum-based catalyst is evenly dispersed, and polymerization activity increased while ensuring stable 1,2-selectivity.
A 3,4-dihydroisocoumarin derivative fused with dihydrothiophene, talarolactone (1), and two known compounds, terreusinone (2) 4,6-dihydroxy-5-methylphthalide (3), were isolated from Talaromyces sp. associated Xanthoparmelia angustiphylla. The structure of 1 was deduced extensive spectroscopic data, electronic circular dichroism calculations, X-ray diffraction analyses. plausible biosynthetic pathway further proposed. Compound showed selective antimigratory activity in a wound-healing assay...
The first transition-metal-free catalyst for the stereospecific polymerization of 1,3-butadiene.
The lithiation reaction is a key step in anionic graft polymerization of polydienes. However, we observed that polymer degradation occurs concurrently with the process. Herein, alkyllithium-induced polydienes was investigated, which showed alkyllithium/N,N,N′,N′-tetramethylethylenediamine system causes polydiene at room temperature or higher. number-average molecular weight rubber decreased from hundreds thousands to within few minutes. This occurred such as polybutadiene, high-vinyl...
Continuous multi-filament boron nitride fibers have been prepared on a large scale using the melt drawn technique from low-cost boracic acid. Boracic acid was heated to obtain molten boric oxide in melting tank. Molten spun conventional manner through an 200-tip bushing produce continuous multifilament yarn consisting of 200 filaments oxide. Boric were nitrided ammonia and annealed inert atmosphere while simultaneously subjecting sufficient longitudinal tension as at least prevent shrinkage...
A series of amine-imine cobalt complexes (Co1-Co7) has been prepared and characterized. The Co3, Co4, Co6 have a distorted tetrahedral geometry, as determined by single crystal X-ray diffraction. In the presence ethylaluminum sesquichloride (EASC), Co3 exhibited ultra-high activity toward butadiene (Bd) polymerization (up to 7813 kgpolymer mol-1 h-1). is higher than any yet recorded for which yield high cis-1,4 polybutadiene well-defined late-transition metal catalytic system. catalyst also...
Boron nitride(BN) fibres were synthesized by modified technique of Economy’s method. The products characterized X-ray diffraction (XRD), fourier transform infrared (FT-IR) absorption spectroscopy, field-emission scanning electron microscopy (FE-SEM), energy dispersive spectrum (EDS) and photoelectron spectroscopy (XPS). results showed that BN fibers mainly hexagonal boron nitride ( h -BN) with diameters 5-8 μm the major compositions are B N a very small amount O C. At last, chemical...
High-performance three-dimensional boron nitride fiber reinforced silicon (BN f /Si 3 N 4 ) composites were prepared by the infiltration and pyrolysis (PIP) process using BN fabrics as reinforcing body excellent organic precursor (Perhydropolysilazane, PHPS) Impregnated liquid. The ablation resistance of composite was evaluated plasma jet test in air. results show that a uniform dense interface layer is formed on surface, with thickness about 100 nm, XRD shows it hexagonal (h-BN). density...
Zirconia fiber separator is one of the important materials nickel-hydrogen battery .In this paper,we studied factors affecting properties zirconia used as separator, which prepared by precursor process, including fibers,fibrous cloths,concentration solution and heating rate before 500oC.The results show that, because gully structure copied fibers, well smaller diameter has larger specific surface area, so cloth higher absorption capacity retention ability alkal. In same way woven, low fabric...
π-Conjugated polymers are usually prepared by polymerization only. In this perspective article, typical synthesis methods of conjugated briefly summarized, and a novel strategy for preparing rearrangement is proposed. During the metalation process, many structures were generated in polybutadiene double bond migration. The effects reaction time, temperature, catalyst dosage on product structure investigated. Moreover, products was confirmed FTIR, 1H NMR, 2D HSQC NMR spectra. Thus, possible...
Objective Try to construct the self-made spinal impactor and simple interspinous process distraction stabilizing device.Discussion on feasibility,stability reliability of method establishing acute cord injury in mice model retaining lamina.Methods Using a electric push fool,a pressure sensor so on,to manufacture inpactor device.32 adult female rats were randomly divided into four groups,using device make varying degrees lamina,non-combat (0 g),mild (5 g),medium (10 g),and severe (20...
The proportional modification parameters are useful for modifying the tooth form errors of spiral bevel gears. Based on mathematical model calculating machine setting and according to relative position relationship between cutter workpiece curvature vector calculation point, formulae first-order gears machined by spread blade method was deduced. can make pressure angle or concave flank convex produce uniform change difference change. is verified experiment CNC gear grinding M&M sigma 7...
ABSTRACT In this study, with Mo‐based catalytic systems consisting of molybdenum pentachloride (MoCl 5 ) as the main catalyst, alkyl aluminum cocatalyst and organophosphorus compound ligand, high 1,2‐orientation butadiene (Bd)‐styrene (St) copolymers were prepared by coordination polymerization. The effects phosphorous aluminum, polymerization temperature, time monomers feed ratios on monomer conversion intrinsic viscosity explored in detail. experimental results indicated that MoCl •TBP...