最新刊期
卷 35 ， 期 3 ， 2022
- 摘要：Electrospun nanofibers, due to their nanoscale, high porosity, and high surface-to-volume ratio, can imitate the extracellular matrix structure. Thus, electrospun nanofibers have wide application prospects in the biomedical fields. Magnetron sputtering, as an emerging technology for surface modification, is a kind of low temperature and high-speed technology, which can modify functionally on the surface of nanofibers in the premise of keeping the original structure of materials. In recent years, it has made certain progresses and shown great research prospects in some medical fields, such as antibacterial and biocompatible modification of membranes, bone tissue repair, artificial blood vessels. However, the study for magnetron sputtering is still in its infancy and more systematic researches are urgently needed. Meanwhile, Some problems, such as poor mechanical properties of nanofibers, synergistic effects of metal antibacterial particles, broad-spectrum antibacterial mechanisms and short efficiency of coatings, need to be resolved, which will decide the application prospects of medical nanofiber membranes modified by magnetron sputtering.关键词：Magnetron sputtering;Electrospun;Nanofibers;Medical materials;Surface modification
- 15
- |
- 12
- |
- 0
发布时间：2022-09-09 - 摘要：Aramid shows excellent mechanical properties, good chemical resistance, and high abrasion resistance, with broad applications in military, aerospace, sports, and protective equipment. However, great challenges remain for aramid, including huge exothermal reaction, utility of toxic solvent, poor solubility and processability, which limit the manufacturing and applications. This article summarizes recent progress in synthesis of aramid, such as n-pentane as phase change coolant, non-aqueous suspension polycondensation, ionic liquid as solvent, and using microreactor. Moreover, copolymerization of functional monomer and synthesis of bio-based aramid are discussed for the modification of aramid. This highlight would provide guidance for the research and development of aramid.关键词：Aramid;Synthesis;Modification;Structure-property relationship
- 18
- |
- 20
- |
- 1
发布时间：2022-09-09 - 摘要：Mussels are one of the most common marine fouling organisms. Nearly all surfaces can be adhered by mussels. The excellent adhesion property of mussels attributes to the mussel adhesion proteins, which has the catechol group in the structure. As an effective surface modified anchoring agent, the catechol group has been proved to have the ability to adhere to any material surface. In this paper, according to the recent five years of domestic and foreign research reports, the materials containing catechol group are introduced. The preparation method and anti-fouling mechanism of the materials containing catechol group and the applications in the fields of ships, medical and health are summarized. Finally, the future research direction of anti-fouling materials and the problems of the reality applications are prospected.关键词：Catechol;Poly(ethylene glycol);Antibacterial;Surface modification;Antifouling
- 15
- |
- 19
- |
- 0
发布时间：2022-09-09 - 摘要：Membrane separation technology is a very popular water treatment technology in the 21st century, which has great potential application due to its high-efficiency, energy saving, good selectivity and easy operation. Electrospun nanofibrous membranes have become an important development direction of membrane separation technology because of their distinctive characteristics such as high porosity, uniform pore size, large specific surface area and easy preparation. In this article, we summarize the synthesis principles, structure design, and properties of various electrospinning nanofiber materials including one-dimensional nanostructures, core-shell or hollow structure, and hierarchical structure. Furthermore, we focus on recent progress on the research development and application status of electrospinning nanofibers based on natural polymers in the fields of adsorption and filtration of heavy metals and dyes, oil-water separation and sea water desalination. Meanwhile, we prospect the development trends and research directions of electrospun bio-based nanofibrous membranes for water treatment.关键词：Electrospinning;Nanofibers;Natural polymers;Water treatment
- 14
- |
- 18
- |
- 1
发布时间：2022-09-09 - 摘要：Light can act on materials without contact, so it is an ideal trigger mechanism and can selectively, non-estructively and remotely activate external stimuli. As a kind of aromatic azo compounds, azobenzene compounds can produce isomeric effects under different light conditions, and this kind of aromatic azo compounds have reversible isomers. The configuration changes based on different wavelengths can make the azobenzene compounds produce micro and macro movements. Based on this macroscopic mechanical deformation and reversible mechanical drive, this kind of photomorphic compounds can be used to make photomechanical and other photomechanical products. Meanwhile, azobenzene derivatives have good properties in drug release and super wetting materials.关键词：Azobenzene;Isomer;Light;Application;Modification
- 14
- |
- 17
- |
- 1
发布时间：2022-09-09 - 摘要：Using carbon nanotubes (CNTs) and acrylonitrile-butadiene-styrene (ABS) to produce the CNTs/ABS composite materials by melt blending method. The rheological behavior of the CNTs/ABS composite was studied by rotary rheometer and the tensile properties was studied by tensile testing machine. The suitable processing parameters can be analyzed by experimental results in order to provide reference for factories in the future. The results show that the viscosity of the composites decreases with the increase of temperature, and the shear thinning behavior is obvious. The addition of CNTs can improve the fluidity of composites. CNTs can reduce the energy storage modulus, loss modulus and complex viscosity of the composites. When the content of CNTs is 1%(wt), all the values are the lowest, and the plasticity of the composites is the best; the tensile strength of the composite material increases with the rise of the CNTs content, and it is hardly affected by the continuous increase of the CNTs content after 3%(wt); the elongation at break varies increase at first and then decrease with the rise of the content of CNTs, and reaching the peak at 3%(wt).关键词：Carbon nanotube;Melt blending;Rheological behavior;Tensile strength
- 12
- |
- 13
- |
- 1
发布时间：2022-09-09 - 摘要：In this work, the renewable potato starch (PS) was used as a raw material and modified by sulfhydryl coupling agent to obtain sulfhydryl functionalized starch (PS-SH), then, the polymerization reaction of m-aminothiophenol occurred under the action of ammonium persulfate as an initiator to obtain poly(m-aminothiophenol) (PMAT), subsequently, elemental sulfur was used as a cross-linking agent to obtain a sulfurized poly(m-aminothiophenol)/starch complex (PS-S-PMAT), finally, the chemical composition, structure and morphology of the material were characterized, and the influence of various variables on the adsorption performance of PS-S-PMAT toward Hg(Ⅱ) ions was explored. The study found the adsorption capacity and removal rate of the material were 226.29mg/g and 90.52% at pH 4 with initial concentration of 100mg/L and 360min of adsorption time. By fitting and analyzing the adsorption data, the adsorption process followed the second-order kinetic model and Langmuir model. The maximum theoretical adsorption capacity of this material for Hg(Ⅱ) was 387.60mg/g. Interfering ions and adsorbent regeneration experiments showed that the interfering ions did not significantly affect the adsorption of Hg(Ⅱ) ions, meanwhile, the adsorption capacity of the material was still 200.73mg/g after five adsorption-desorption cycles, which indicated that the material was selective and reusable performance.关键词：Starch;Poly(m-aminothiophenol);Elemental sulfur;Adsorption;Hg(Ⅱ)
- 15
- |
- 13
- |
- 0
发布时间：2022-09-09 - 摘要：In this paper, a blending modification method is used to obtain a nylon 6 matrix with high melt strength. Through exploring different process conditions, nylon 6 foam materials with different magnifications are obtained, and the melt strength of different ionomer modifier ratios is systematically studied. Influence. The existence of micro-crosslinked structure is inferred through thermal performance test and rheological test. Nylon 6 foam materials with different foaming ratios were prepared by adjusting the foaming process, and the cell morphology was observed with a scanning electron microscope (SEM). The results show that the addition of ionomer greatly improves the melt strength of the nylon 6 matrix, realizes the possibility of nylon 6 supercritical carbon dioxide foaming, and obtains a nylon foam material with a larger magnification.关键词：Polyamide 6;Supercritical carbon dioxide;Melt strength;Foaming rate
- 13
- |
- 19
- |
- 0
发布时间：2022-09-09 - 摘要：Glass transition is an important concept in the teaching of polymer physics. In some polymer physics textbook, the glass transition is described as the transition temperature in which the materials were transformed from glassy to the rubbery state. Such definition, mainly from the variation of mechanical property induced by temperature, is easily understandable, but however miss the key and essential points of the glass transition phenomenon, even leading the student having false impression that glass transition is a unique property of polymer. To this context, we tried to teach glass transition under the framework of glass physics; describe the glass transition as a general feature of amorphous materials and emphasizes the nature of glass transition — a transition from supercooled liquid to solid glass induced by the mobility freeze-in. Then, the glass transition of polymer and the remarkable changes in mechanical properties were introduced as a special attention. We hope that this disparate way of teaching polymer glass transition could help students to establish comprehensive and precise understandings on the phenomenon of glass transition and polymer glass transition.关键词：Glass transition;Polymer physics;Glass physics
- 14
- |
- 18
- |
- 0
发布时间：2022-09-09 - 摘要：The technology of preparing lithium-ion battery separator of polypropylene via a dry uniaxially stretching process involves a lot of contents of polymer physics from multiple chapters, such as Structure of polymer chains, Condensed phase, Molecular motion and transitions, Viscoelasticity, Yield and fracture, Rheological property, Surface and interface, etc. Therefore it is very suitable for the case teaching. This paper discusses how to combine the knowledge points involved in the manufacture with the case teaching of polymer physics. The microstructure of the condensed phases of polypropylene in each section of manufacture and the effects of process parameter change on the structure and properties are analyzed. Furthermore, the discussion is made about the technology of biaxially stretching process and the technology of hydrophilic modification of separator of polypropylene based on the knowledge related to polymer physics. It is helpful for the students to master the relevant knowledge flexibly and improve their ability in engineering practice and creativeness.关键词：Polymer Physics;Case teaching;Lithium-ion battery separator;Polypropylene
- 18
- |
- 19
- |
- 1
发布时间：2022-09-09 - 摘要：With the increasing of personnel training requirements in China, colleges and universities attach great importance to the quality of undergraduate education. While graduation thesis plays an important role in the undergraduate training system. Interdisciplinary has the characteristics of interdisciplinary, integration and infiltration, therefore, interdisciplinary topic selection puts forward higher requirements for undergraduates and teachers. In this paper, we took biomedical polymer materials as an example, and focused on the following four aspects: the rationality of thesis topic selection, objectives and tasks of the proposal, ideas and methods of experimental guidance, and standardization of thesis writing. In addition, this paper puts forward some reasonable suggestions to improve the quality of interdisciplinary graduation thesis.关键词：Interdisciplinary;Undergraduate thesis;Quality improvement;Biomedical polymer materials
- 14
- |
- 15
- |
- 0
发布时间：2022-09-09 - 摘要：Interdisciplinary integration engineering talent cultivation is one of the most important development directions for talent output of higher education. How to cultivate interdisciplinary engineering talents is an important problem for the current construction and development of engineering majors. Nonwoven materials and engineering is an engineering major, which is established to meet the needs of talents for national industrial textile industry, and has polymer materials, chemistry, machinery, textile interdisciplinary and practicality characteristics. In this study, the interdisciplinary integration engineering talent cultivation mode was established based on construction and practice of training program, curriculum system, teaching staff, teaching method and talent training evaluation program, and good results have been acquired.关键词：Nonwoven materials and engineering;Interdisciplinary;Engineering talent;Cultivation mode
- 18
- |
- 18
- |
- 0
发布时间：2022-09-09
- Technical support is provided by Beijing Founder electronics co., LTD 京ICP备09064830号-19
京公网安备11010802024621 - 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