最新刊期
卷 32 ， 期 8 ， 2019
- 摘要：Polypyrrole has the advantages of low cost,good environmental stability, easy functionalization, conjugate structure, etc. But the insoluble, infusible and difficult to process of polypyrrole seriously limited its development and application in industrial production. Therefore, the modification of polypyrrole has attracted much attention. The applications of polypyrrole-based composites in adsorption and electromagnetic properties are reviewed. polypyrrole-based composites as adsorbents were mainly summarized from the types of pollutant removal and possible adsorption mechanism. The research on the electromagnetic properties of polypyrrole-based composites mainly focuses on supercapacitors and electromagnetic adsorption materials. Finally,the development trend of polypyrrole-based composites in this field is prospected.关键词：Polypyrrole;Adsorbent;Electromagnetic performance;Composite
- 7
- |
- 9
- |
- 0
发布时间：2022-09-02 - 摘要：Hydrogel,a family of three-dimensional network hydrophilic polymer soft materials,has remarkable solid mechanical and liquid thermodynamic properties. It is flexible and has excellent characteristics of plasticity, biocompatibility as well as degradability. It also shows high stimulus response characteristics. Hydrogels prepared by traditional methods have many problems,such as toxicity, low biological activity and mechanical properties,which limits their application. This paper reviews the application and research progress of modification and preparation of functional hydrogels in recent 10 years. On the basis of the original function of hydrogels, increasing their absorption sites and mechanical strength were mainly optimized and improved. The advance preparations involved the physical modification of low molecular weights composite crosslinking and construction of multiple networks and the chemical modification of graft copolymerization method. The application and development prospect of functional hydrogel materials were introduced in medical supplies, drug delivery and remission,cell culture in biological engineering,agricultural drought resistance and food packaging respectively. Finally, this paper focused on the smart molecule imprinting hydrogels with high specific molecular recognition properties. The combination of intelligent hydrogel technology and molecular imprinting technology for the detection of trace drugs can reduce the detection cost, shorten the detection time and improve the detection efficiency. It provides reference for further development and application of hydrogels.关键词：Functional hydrogel;Hydrogel preparation;Modification
- 17
- |
- 25
- |
- 0
发布时间：2022-09-02 - 摘要：Dielectric materials with high energy storage density were the core of the energy-storage capacitor, which had a very important influence on advanced equipment fields such as high-energy weapons and smart power grids. Compared with metal oxide- and ceramic-based dielectric materials, polymer-based ones possessed the advantages of low density,good processability,low loss,and high breakdown strength. Herein, the design, preparation and related properties of polymer-based dielectric composites were reviewed.关键词：Polymer-based dielectric composites;Multilayer structure;Dielectric constant;Dielectric loss;Energy storage density
- 9
- |
- 15
- |
- 7
发布时间：2022-09-02 - 摘要：In view of the fact that the current polymer microsphere profile control agent has a single variety and high production cost, cross-linked poly (styrene-acrylamide) microspheres with the mean diameters lower than 1µm,were developed by emulsion polymerization in the study. Styrene(St), acrylamide (AAm), and N, N′-methylenebisacrylamide(MBA), were selected as the monomers. The factors which influence the mean diameter of the microspheres were investigated by particle size analysis, transmission electron microscopy(TEM), and scanning electron microscopy(SEM). The SEM and TEM results show that the mass ratio of AAm to St and MBA addition is the key to prepare well-defined microspheres, the mass ratio of AAm to St must ≤3 : 17 and the MBA concentration must ≤ 18.5g/L. The results of particle size analysis show that the mass ratio of AAm to St and MBA concentration influence the particle size of the microspheres significantly; the mean diameter of the microspheres increased with the increase of the mass ratio of AAm to St. Increasing MBA concentration, the mean diameter of the microspheres increased firstly, and then decreased; The influence of AES concentration, APS addition and temperature on the mean diameter of the microspheres is insignificant. The results show that the optimum conditions for preparing well-defined microspheres are the mass ratio of AAm to St≤3 : 17,MBA concentration ≤6.25g/L,AES concentration ≤7g/L,APS concentration 1.25g/L, and temperature 70℃. Under the optimum conditions, the microspheres with mean diameters ranging from 58.5 to 559.8nm can be prepared.关键词：Emulsion polymerization;Cross-linked poly (styrene-acrylamide) microspheres;Low permeability reservoir;Profile control agent
- 7
- |
- 14
- |
- 4
发布时间：2022-09-02 - 摘要：In vitro interaction of methylmercury and inorganic mercury with immunoglobulin IgG was studied using the small angle X-ray scattering (SAXS) method to detect whether the structure of IgG has changed. After processing by S.exe software package, Kratky plot, distance distribution function and protein shape data of the reaction molecule conformation were obtained. Combining the various parameters, it was found that different reaction times and different mercury forms can cause the folding and unfolding of the molecular structure of IgG. these results indicate that mercury can affect the structure of immunoglobulins.关键词：Methylmercury;Inorganic mercury;Immunoglobulin;X-ray scattering
- 6
- |
- 11
- |
- 0
发布时间：2022-09-02 - 摘要：The influence on the structure and thermal stability of the rubbers were studied by the mechanical properties, scanning electron microscopy (SEM),infrared spectra (IR), X-ray photoelectron (XPS) and thermogravimetric analysis(TG),and compared with carbon black and silica. The results showed that the modified diatomite had good reinforcing effect on fluorine rubber (FKM),acrylic rubber (ACM),ethylene propylene diene monomer rubber (EPDM),natural rubber (NR) and chloroprene rubber (CR), the compatibility between the modified diatomite and the rubbers was good, and the modified effect for the FKM was the best in all rubber. Compared with the silica, the tensile strength, elongation at break and wear resistance of the FKM were increased by 28%, 17% and 30%,respectively, and the EPDM was increased 11%,12%, and 14%, respectively. And the modified diatomite could improved the thermal properties of FKM and EPDM.关键词：Diatomite;Rubber;Composites;Mechanical properties;Structure
- 9
- |
- 14
- |
- 2
发布时间：2022-09-02 - 摘要：The non-isothermal crystallization of PVDF and different proportions of PVDF/PVB was observed respectively at different cooling rates by differential scanning calorimeter.The non-isothermal crystallization kinetics of both PVDF and different proportions of PVDF/PVB were studied by Jeziorny equation and Mo Zhishen's method. The results show that at the same cooling rate, the increase of PVB content causes the crystallization temperature range to decrease first and then increase,the peak temperature first increases and then decreases, and the crystallinity increases first and then decreases, indicating that the addition of PVB to the crystallization of the blend. It promotes the post-inhibition effect; and the increase of PVB content,the n value of the blend increases,indicating that the crystal growth mode changes from near two-dimensional platelet growth to three-dimensional spherulite growth, and the addition of PVB promotes the blend. Generate multidimensional complex crystals.关键词：Polyvinylidene fluoride;Polyvinyl butyral;Non-isothermal crystallization kinetics;Jeziomy method;Mo Zhishen method
- 8
- |
- 13
- |
- 0
发布时间：2022-09-02 - 摘要：In this research, an acrylic emulsion modified by alkyl acrylate phosphate was synthesized by core-shell emulsion polymerization.The effects of emulsion polymerization temperature, emulsifier,adding amount and methods of phosphate ester monomer, pH value on emulsion synthesis and film properties were discussed.When emulsion was modified by alkyl acrylate phosphate, while, the solid content and the conversion rate of monomer increased. The gel rate and water absorption rate of coating film decreased. The stability of emulsion was improved. The water resistance performance of emulsion and the crosslinking degree of film could be improved by using delayed addition of phosphate ester (0.5% (wt))and adjusting pH value of the reaction system to 5 at 78℃.关键词：Alkyl acrylate phosphate;Acrylic emulsion;Emulsion
- 10
- |
- 16
- |
- 3
发布时间：2022-09-02 - 摘要：It is one of the key development directions of experimental teaching reform to combine the latest research hotspots in the field of specialty with undergraduate teaching. Through systematic and specialized design, exploratory experimental projects can be transformed by extracting content that reflects the value of academic research from recently finalized fund projects, which is beneficial to cultivate innovative ability of undergraduate students. In view of the importance of halogen-free flame retardant technology of polymer materials and the wide application of epoxy resins,this paper will discuss the design and implementation method of the exploratory experimental project entitled " Preparation and Performance Research of Halogen-free Flame Retardant Epoxy Resin".关键词：Polymer physics experiment;Exploratory experiment;Teaching reform;Halogen-free flame retardant epoxy resin
- 6
- |
- 12
- |
- 1
发布时间：2022-09-02 - 摘要：Some problems were found when students were learning "Research Methods of Polymer Materials", including that the basic knowledge was not solid, the ability to use knowledge and comprehensively analyze problems was poor. Based on the concept of "engineering education accreditation", referring to as "student-centered,outcome-based and continuous quality improvement" and at the same time,taking into consideration of the characteristics of the curriculum, this study suggested methods to reform teaching design, for example, selecting appropriate teaching strategy for different content, designing "teacher-oriented, student-centered" teaching process and setting up diverse teaching evaluation system. Simultaneously,in the process of teaching implementation,heuristic teaching,interactive teaching, problem-oriented teaching and combination of theory and practice should be adopted to improve teaching quality and learning efficiency.关键词：Engineering education accreditation;Teaching design;Teaching implementation
- 7
- |
- 11
- |
- 1
发布时间：2022-09-02 - 摘要：Polymer sciences are foundation of growing polymeric materials industry,and deeper understanding and sophisticated usage on the sciences is the premise of polymer industry practicality. However, some students majored in polymer materials dislike polymer science, and further teaching performance and engineering applicability will be cloudy. As a result, we need to deploy polymer science instruction research for cultivating special talents with deep polymer theories and practicality capacity. In this article,we presented our experience in teaching introduction on polymer sciences aimed at arousing students' long, active learning on polymer sciences. In instruction, we combined highly emphasizing applicability of polymer materials,practice solvability in polymer sciences theory and principles with presenting colorful history polymer sciences, and held knowledge,story and practice together, for directing students to acquainting,mastering and devoting to polymer sciences.关键词：Introduction on polymer sciences;Interesting instruction;Experiences
- 5
- |
- 10
- |
- 0
发布时间：2022-09-02 - 摘要：Some teaching materials and experiences in the class of Polymer Physics are shared in this paper. Polymer Physics is one of the most important specialized basic courses for the students majoring in polymer materials. However, as is known,this course is boring and hard to understand well since its complexity and abstraction. Some appropriate and interesting cases,which the students are familiar with, are used as teaching materials including some classic poems and idiom. That is helpful for the students to deeply understand polymer structure, movement, properties and relationships among them. Owing to these teaching materials, some boring theories are explained perfectly in a simple style and the classes appear lively and interesting. And furthermore,that contributes to training the students' divergent thinking, improving abstract analysis skill and enhancing creative ability.关键词：Polymer Physics;Teaching materials;Classic poem
- 12
- |
- 12
- |
- 0
发布时间：2022-09-02 - 摘要：The training of the engineering capabilities is the core of higher engineering education, which is the requirement of transformation of traditional engineering major to new one. The training system of engineering capabilities, as an essential component part of cultivation plan for composites materials and engineering major, plays an important role in the talent training quality. After the several years' practice and research, an training system including the step-by-step training of experimental capabilities, training and strengthening of engineering practice ability was established, which had beneficial effects on the improvement of engineering capabilities, innovative thinking and innovative capabilities of students and therefore made a favorable implementation effect.关键词：Composite materials and engineering;Excellent engineer education and training programs;Engineering capabilities;Practice teaching
- 8
- |
- 10
- |
- 1
发布时间：2022-09-02
- 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