最新刊期
卷 0 ， 期 0 ， 2020
- 摘要：Organophosphorus pesticides are widely used in agriculture production at present. Organophosphates can irreversibly combines acetylcholinesterase to inhibit the catalytic active sites of acetylcholinesterase in nerve-impulse transmission, which leads to nerve disease through accumulation of acetylcholine, even causes death. The serious threat of organophosphates to biological systems has stimulated intensive studies to develop sensitive and selective methods for detection of these compounds. Fluorescent chemosensor has attracted considerable attention due to its high sensitivity, rapid response and low detection limit to organophosphates. In this article, recent research progresses on the design and fabrication of polymer-supported fluorescent probes are reviewed, and their advantages in the detection of organophosphates are discussed and summarized. New trends and future perspectives of this research area are also proposed.关键词：Polymer-supported;Fluorescent probes;Organophosphates;Research progress
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发布时间：2022-09-18 - 摘要：Helical polymer was a polymer that had special application in asymmetric fields, can be used for the separation of enantiomers, asymmetric catalysis and asymmetric optical fields,etc. The synthesis of helical polymer has been the research focus of the synthetic polymer science. Free radical polymerization with many advantages has attracted much attention in synthesis of helical polymer, but there are few successful examples because of defects of the free radical polymerization. In this paper, the defects of free radical helix polymerization are discussed, various methods are summarized and introduced including chiral monomers,free radical polymerization, the chiral initiator polymerization, chiral chain transfer polymerization, chiral template controling polymerization and chiral solvent polymerization, etc. Moreover, the future study prospect were proposed.关键词：Helical polymer;Radical polymerization;Polymerization method;Research progress
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发布时间：2022-09-18 - 摘要：Electrospinning is one of the effective ways to prepare ultra-fine or nano fibers. Research on melt electrospinning is at the primary stage compared to that on solution electrospinning which is deep and broad. Since the process of melt electrospinning is non-toxic, pollution free and can give high product conversion rate, it has wide application prospects, especially in the area of filtration and biomedicine. What’s more, theoretically, any polymer whose decomposition temperature is higher than its melt temperature can be used to melt electrospin. Meanwhile, melt electrospinning also has weak points such as more complex device and thicker fiber diameter. In this paper focusing on melt electrospinning, typical devices are introduced; polymer types and spinning parameters are summarized; effects of spinning parameters on fiber properties are compared; applications are discussed; and at last the developing direction is forecasted.关键词：Melt-electrospinning;Devices;Polymers;Fiber properties;Applications
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发布时间：2022-09-18 - 摘要：Amphiphilic polymer micelles had prominent physical and chemical features and-particular function,which could form polymeric micelles with a core-shell structure and achieved drug-loaded by self-assembly in solution. The technology of self-assembly drug-loaded can alleviate the lack of drug materialsin China and meet the new trend of drug excipients.Polymeric micelles formed by self-assembly technology has intensive prospect in targeting drug delivery, developing pharmaceutical formulations and new drug materials. The principles and methods of drug-loaded micelles were summarized, especially the latest research achievements and the future development of three types of amphiphilic polymer micelles in self-assembly carry drug. Meanwhile, the applications of drug-loaded micelles in drug release were summarized in this paper.关键词：Amphiphilic polymer;Micelles;Self-assembly;Drug-loaded
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发布时间：2022-09-18 - 摘要：The silk fibroin nanofibres membrane fabricated by electrospinning has large surface specific area, high prosity, biocompatibility, etc. Therefore, it is widely investigated at home and abroad. This article mainly reviews the development on fabrication silk fibroin nanofibres by electrospinning method. The emphasis is focused on the preparation of pure silk fibroin nanofibres and silk fibroin composite nanofibres using different solvent. The potential applications for these nanofibres have also been expected.关键词：Electrospinning;Silk fibroin;Nanofibres
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发布时间：2022-09-18 - 摘要：Vanadium Redox Flow Batteries (VRB) is one of the most rapidly developed accumulation energy in recent years. Regard as the most important component, the separate membrane in VRB is directly related to the efficiency of transformation of energy storage and service life. In this paper, we give a brief introduction of the present situation of the VRB separate membrane. Nafion membrane as the most widely used membrane is discussed on the conduction mechanism, the exchange mechanism and the modification technologies, such as surface coating, crosslinking, surface recombination and so on. Then the advantages and disadvantages of various modification methods were analyzed by compared with each other. In addition, recent progresses about the non perfluorinated heat-resistant proton exchange membrane of sulfonated special engineering plastic membrane and the functionalization of polyolefin membrane are made a comprehensive summary. At last, we give the development trend of VRB in the future.关键词：Vanadium redox flow battery (VRB);Separate membrane;Perfluorinated sulfonic acid proton exchange membrane;Special engineering plastic;Polyolefin functionalization membrane
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发布时间：2022-09-18 - 摘要：The molecule of berberine was selected as a model molecule. The effects of operation time, operation pressure, solution concentration, ionic strength, and other factors on the rejection efficiency were investigated. The results indicated that the rejection rates of berberine by polyamide nanofiltration membrane were approximately equivalent after 80 min. The flux and rejection rate of berberine increased with the increase of operation pressure. The flux decreased with the increase of berberine concentration, and the rejection rate of berberine first rose up then decreased with the increase of berberine concentration. Both flux and rejection rate of berberine decreased with the increase of ionic strength. At the condition of the content of alkaloids 0.025g/L and operation pressure 0.4MPa, alkaloids in the extract of ahizoma coptidis were concentrated 6.27 times.关键词：Nanofiltration membrane;Ahizoma coptidis;Alkaloids;Retention rate
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发布时间：2022-09-18 - 摘要：In the study, A certain molecular structure of the PNIPAAm-PLA block copolymer is synthesized. Dialysis is applied to prepare the PNIPAAm-PLA magnetic composite micelles and vesicles. Different preparation conditions form micelles and vesicles respectively, and the morphology of the two carrier s is contrasted. Two structures of the carrier are suitable for the loading of hydrophobic drug and hydrophilic drugs respectively.The LCST of composite micelles is characterized, its LCST is around 38℃,which is little higher than normal body temperature. Different feed ratios of Fe4O3 magnetic particles leads to different magnetic properties of micelles, but the ratio doesn’t play an important role in magnetic property.关键词：Magnetic;Thermo-responsive;Drug carrier
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发布时间：2022-09-18 - 摘要：Graphene oxide was obtained to prepare polyacrylonitrile/graphene oxide (PAN/GO) composite nanofibers by electrospinning method. A series of PAN/GO composite nanofibers was prepared with different mass fraction of graphene oxide. The scanning electron microscope (SEM) and the transmission electron microscopy (TEM) were used to observe the microstructure of the composite nanofibers. And then study the thermal performance of the composite nanofibers via the differential scanning calorimeter (DSC) and the thermal gravimetric analysis (DTA). Finally computer-controlled electronic universal testing machine was used to study the mechanical properties of the composite nanofibers. The results show that when the graphene oxide was added, the PAN/GO composite nanofibers become thin and the thickness uniformity of the nanofibers was affected. The oxidation of PAN was suppressed because of graphene oxide. The mechanical property of PAN was increased with graphene oxide added. The breaking strength of PAN was doubled when the mass fraction of oxide graphene was 0.1%, but the breaking strength was reduced when that was 1%. According to the experimental results the mass fraction of oxide graphene at 0.1% was better.关键词：Electrospinning;Nanofiber;Polyacrylonitrile;Graphene oxid
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发布时间：2022-09-18 - 摘要：The branched polymers with different branching structures were synthesized through atom transfer radical polymerization (ATRP) via controlling the adding method of divinylbenzene (DVB). The four-arm star polymers with different arm length were also prepared by ATRP as the reference for branching structure characterization. Triple detection size exclusion chromatography (TD-SEC) analysis showed that the exponential factor ε had a strong molecular weight dependence, here, ε (g’=gε) is the branching structure parameter expressed by Zimm branching factors g’=[Intrinsic Viscosity]branched/[Intrinsic Viscosity]linear and g= [Mean Square Radii of gyration]branched/[Mean Square Radii of gyration]linear at the same molecular weight. The average ε value of star-like branched polymers was less than unity, and remained relatively constant with the change of molecular weight; while the average ε value of randomly branched polymers was larger than unity, and decreased gradually with increased molecular weight. Therefore, the polymer branching structure can be characterized using TD-SEC.关键词：Branching structure;Triple detection size exclusion chromatography;Zimm branching factor;Randomly branched polymer;Star-like branched polymer
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发布时间：2022-09-18 - 摘要：Infrared thermography (IRT), which is a non-contact and non-destructive technique to measure temperature variations on the surface of the materials, has been widely used in global industrial process (e.g. electricity, construction, health care, military, et, al.) because it’s characters of producing high quality image and accurately determining temperature. However, the application of infrared thermography in polymer science is relatively few. In this paper, the principle of IRT is introduced briefly and the application of IRT in the research of polymeric science is reviewed, including study on deformation thermal effects of materials in extension, impact, fatigue test, dynamics of fiber formation processes and polymerization processes.关键词：Infrared thermography;Polymer science;Thermal effects
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发布时间：2022-09-18 - 摘要：This paper reviewed the application situations of dynamic mechanical analysis (DMA)technology in the researches of wood plastic composites,and emphasis was put on the summarization of the interfacial compatibility issues of wood plastic composites using dynamic mechanical analysis. When different modifiers were used to improve the interfacial adhesion of wood plastic composites (WPC), the stiffness of WPC was improved. Compared with untreated composites, the storage modulus of modified composites was higher. It can be concluded that the tanδ of better interfacial compatibility on WPC was lower than bad one due to the strong interfacial adhesion can restrict the filler-matrix motion. Therefore, the glass transition temperature can be moved high temperature. At the same time, the higher interfacial strength indicator and the activation energy for the relaxation process, the higher interfacial adhesion of composites.关键词：Dynamical mechanical analysis;Wood plastic composites;Interfacial compatibility
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发布时间：2022-09-18 - 摘要：Polymer-based conductive composites were broadly applied in many fields, such as electromagnetic shielding, electric conduction, antistatic materials, self-limiting temperature heating, heat conduction and so on. Currently, the fillers used in electrically conductive polymer composites are in solid state during the processing, including metal, carbon black, graphite and graphene. In contrast to this, the low melting point metals are in liquid state as conductive fillers during the processing, which allows to reduce the viscosity of the composites, improve the processability, reduce the wear on equipment, reduce the particle size of fillers and increase the length-diameter ratio of particle. In this paper, LMPM/polymer composites’ preparation methods, and the main features of composite’s structure, conductivity, rheology and mechanical properties were reviewed, LMPM/polymer conductive composite’s superiority compared with other polymer-based conductive composites were introduced, and some deficiencies in this field were pointed out.关键词：Low melting point metal;Polymer;conductivity;Rheology;Mechanical properties
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发布时间：2022-09-18 - 摘要：A comprehensive teaching experiment for polymer material and engineering was designed in the paper. Three materials with pepsi bottle were analysed by FT-IR, UV-Vis, DSC and TG, The compositions of three materials (PE, PET, PP) with pepsi bottle were determined, and provide reasonable explanation for a common phenomenon in the daily life, that is, every material should be recycled separately. The comprehension between structure and properties of polymer materials was enhanced by this experiment. Effective teaching performance was obtained in several years.关键词：Comprehensive experiment;Polymer material;PE;PET;PP
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发布时间：2022-09-18 - 摘要：To gain the enhancement of teaching quality and the improvement of teaching effect, construction of polymer chemistry experimental teaching contents was strengthened. Under the guidance of collaborative innovation idea, a series of comprehensive interdisciplinary experiments were built up, combining polymer chemistry experiment with food engineering, pharmacy and environmental engineering, according to the specialty establishment and the personnel training scheme. Reform of teaching contents reflected the concept of collaborative innovation teaching, broadened student's field of vision, and helped students develop innovative spirit and practice ability. Teaching material based on college-college cooperation was published, and provincial essence course website was built. The construction of teaching material and course website can keep on development. The advanced, comprehensive and guidance qualities of experiment contents were enhanced.关键词：Polymer chemistry experiment;Experimental teaching;Multi-subject combination;Collaborative innovation
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发布时间：2022-09-18 - 摘要：The teaching and research of polymer rheology fall behind those of other fields of polymer science because of the interdisciplinary characterization of polymer rheology. The numerical simulation based on computational fluid dynamics (CFD) was introduced to the course in order to improve the comprehension of students for basic concepts of polymer rheology and motivate students’ interest in learning. Several corresponding examples such as Weissenberg effect, secondary flow, die swell and screw mixing are provided to investigate the essential difference between the viscoelastic fluid and Newtonian fluild, and guide the students how to use polymer rheology in the engineering designs. Meanwhile, the applied function of engineering designs for polymer rheology is used to explain the fundamental principles of polymer rheology. Therefore, the method is favorable to optimizing curriculum structures and improving the quality of teaching.关键词：Polymer rheology;CFD;Constitutive equation;Teaching
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发布时间：2022-09-18
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