最新刊期
卷 31 ， 期 10 ， 2018
- 摘要：Thermo-sensitive polymer aqueous two-phase extraction is a new and green separation and enrichment technology, this system has the advantages of mild conditions,strong selectivity, high extraction efficiency, short operation time. Recyclable materials simply changing the ambient temperature,the phase forming polymer can be separated from the target separation. It has been used in biological separation,metal ion separation,extraction of active components from natural products,drug separation and so on. In this paper, the formation principle of thermo-sensitive polymer aqueous two-phase system, the research progress of liquid-liquid equilibrium theory of two-phase aqueous phase and its application are briefly introduced. It is hoped that this paper will be helpful and enlightening to further research work.关键词：Thermo-sensitive polymer;Aqueous two-phase system;Liquid-liquid equilibrium
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发布时间：2022-09-05 - 摘要：Dielectric elastomers are a kind of new textile materials that can be deformed under energy-excited electric field to perform energy conversion. They belong to electroactive polymers,and electroactive polymers have electronic and ionic types. Dielectric elastomers have broad application prospects in the design of flexible actuators. However, there are still many technical difficulties. There is still a need for more in-depth studies on the composition of elastomeric matrix materials,optimization of flexible electrode materials,and energy harvesting. In this paper, after clarifying the working principle and classification of the dielectric elastomer, it summarized the electrode, pre-stretching,temperature and energy collection,etc.,and prospected its application prospects.关键词：Electroactive polymers;Dielectric elastomers;Drivers;Energy harvesting
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发布时间：2022-09-05 - 摘要：Vanadium redoxflow battery (VRFB) is a large-scale energy storage device, which has become increasingly mature in new energy field for the past few years. As the key composition of VRFB, the choice of proton exchange membranes(PEMs)has a great impact on the VRFB's performance and investment, an ideal PEM,not only perform the role of conducting protons, but also have the ability to prevent vanadium ions permeation,and should meet the requirements of physicochemical stability and acceptable cost at the same time. In this review,a detailed introduction about the latest progress in the field of PEMs for VRFB is given, based on the difference of chemical composition and physical structure of polymer materials. Finally, there is a highlight of the key research and development direction of PEMs in the future.关键词：Vanadium redox flow battery;Proton exchange membrane;Research status
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发布时间：2022-09-05 - 摘要：Three kinds of random copolymer P(LLA-CL) rods were prepared by one-step ring-opening polymerizing molding from the L-lactide and ε-caprolactone with low toxicity stannous octoate as catalyst,and PTFE tubes were used as mould. The properties of copolymer rods were analyzed by 1H nuclear magnetic resonance,infrared spectrum, differential scanning calorimeter and thermogravimetric analyzer. Scanning electron microscopy was used to observe the micromorphology of the brittle fracture section of the copolymer rods. The results showed that the synthesized polymers were random copolymers,the copolymerization ratio was close to the feed ratio. Changing the content of ε-caprolactone could change the crystalline morphology and adjust the mechanical properties of copolymer. The results are valuable for the application of copolymer P(LLA-CL) in medical devices.关键词：L-lactide;ε-caprolactone;P(LLA-CL);Fallopian tube embolization;Properties;Micromorphology
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发布时间：2022-09-05 - 摘要：The optimum process condition of emulsifying polymer wax was obtained by the orthogonal design method using Fatty alcohol polyoxyethylene ether (MOA-15),Propanediol block polyether (L31) and Laurate polyoxyethylene ester (LAE-4) as compound emulsifiers with phase conversion method. The optimum process conditions were HLB value 9,the dosage of compound emulsifier 8%,the emulsifying temperature 80°C. The particle size distribution was tested by using dynamic light scattering (DLS),and the particle size was 256. 3nm. The relation of modulus and dynamic frequency of polymer wax emulsion was discussed by using the dynamic rheological test. The dynamic frequency scanning test investigated that the polymer wax emulsion system has better viscoelasticity. The waterborne coatings were prepared by mixing the polymer wax emulsion and waterborne polyurethane. Effect of different content of polymer wax emulsion was discussed. With the increment of the content from 0 to 4 %, the abrasion loss of the membranes decreased from 29. 2mg to 13. 9mg, the water absorption decreased from 34. 1% to 20. 5 %,and the gloss of the membranes increased.关键词：Polymer wax emulsion;Waterborne coatings;Stability;Wear resistance
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发布时间：2022-09-05 - 摘要：Polyether polyol is the main raw material for polyurethane manufacture at present. Its composition and structure will affect the final performance of polyurethane products directly. In this article, we developed an Ultra Performance Liquid Chromatography-Electrospray ionization-Quadrupole-Time of Flight Mass Spectrometry (UPLC-ESI-Q-TOF MS) method to analyze complex polyether polyol. The polyol samples were first separated in two eluents by HPLC, then investigated by a study of multistage mass spectrometry. The sample 1 was identified to be polyoxypropylene ether initiated by sorbitol (nPO = 6〜15). The main components identified of sample 2 were polyoxypropylene ether initiated by glycol (nPO = 2〜6),sorbitol (nPO = 7〜15) and sucrose (nPO = 10〜15), the weight percentage of the three components is obtained to be 13. 4%, 80. 3 and 6. 3% through the extracted ion chromatogram area integration method. The sample 3 was identified to be polyoxyethylene ether initiated by glycerol (nEO = 18〜39). The deduction for the structure of three complex polyether polyol is validated by the analysis of the MS/MS fragmentation. This article provides a simple, accurate and reliable analysis method for polyether polyol, which contains high resolution and sensitivity, and the qualitative and quantitative results can be obtained at the same time.关键词：Time-of-flight mass spectrometry;Electrospray ionization;Polyether polyol;Initiator
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发布时间：2022-09-05 - 摘要：Briefly described is the present situation of chemical terminology and nomenclature published in China and the world. Furthermore, details are presented about the recent progress of polymer terminology and nomenclature published in China and the world. Additionally, termonline. cn,the Internet platform for terms in sciences and technologies,is introduced.关键词：Terminology;Term;Nomenclature;Internet platform
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发布时间：2022-09-05 - 摘要：As a core course of polymer materials and engineering,many problems still exist in the traditional model of experimental courses. With the rapid rise of Internet era, MOOCs are introduced to the experimental course of polymer materials. Under this background, the theoretical foundation of students is improved by the online course. At the same time,the combination of online learning and offline real operation has realized when the gradient mode as the main teaching mode is brought in,enhancing the students' autonomous learning ability and practical ability. Under certain conditions, the traditional education mode of time and space limitations is broken down, resulting in the improvement of students' learning interest and the teaching quality. the effective use of learning time,improve efficiency of the classroom,the students, teachers,online mutual mechanism can promote the improvement of the teaching effect and promote the reform of education. The mutual evaluation between students and teachers can promote the teaching effect and the reform of education.关键词：MOOCs;Gradient mode;Polymer materials;Experimental reform
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发布时间：2022-09-05 - 摘要：Polymer Physics and Chemistry as one of major compulsory courses of new opened major Non-woven materials and engineering of Zhongyuan University of Technology, exhibits characteristics of more contents, theory abstract and limited class hours. How to teach well based on student characteristics,course requirement and goals of talent training needs to adapt necessary measures after situation analysis. In this paper,the problems of insufficient teaching hours, perquisite course connection and combining theory with practice of Polymer Physics and Chemistry course teaching in our college were investigated, and corresponded resolutions were proposed. Good achievement has been made by conducted the projects.关键词：Polymer physics and chemistry;Non-woven materials and engineering;Curriculum reform
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发布时间：2022-09-05 - 摘要："Polymer Blending Modification" is a professional course in polymer material and engineering, And comprehension, practicality and frontier are the characteristics of the course of "Polymer Blending Modification" . According to the characteristics of the courses of polymer blending modification, combining classroom teaching and experimental teaching experience, the current teaching condition and existing problems are analyzed. The problem include the learning tired of the student with the studing of the course, simple teaching methods, the lack of practice, outdated textbook and incomplete evaluation mode and so on. Some proposals of teaching reform for the course of polymer blending modification are proposed from the model of teaching, the content of teaching, the system of teaching, evaluation mode and other aspects. The purpose is to improve to stimulate students' interest in learning and to improve the teaching effect through the teaching reform which is lay a foundation for training applied and innovative talents.关键词：Polymer Blending Modification;Problems;Reform;Effect
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发布时间：2022-09-05 - 摘要：The free radical polymerization process is a very important chapter in the course of "Polymer Preparation Engineering", mainly involving bulk polymerization, emulsion polymerization, suspension polymerization and solution polymerization. The selection and utilization of initiators will greatly affect the effect of these four kinds of polymerization. It is important to control the free radical polymerization by correctly understanding the kinds,characteristics, kinetics processes and the selection rules of different initiators in different polymerization reactions. However, due to a wide variety of initiators and different characteristics, students often deviate from understanding and memory, resulting in polymerization failure in the actual production. This paper will use the grid teaching method to help students build up the memory grid of initiator. The complexity of the content is presented to students through grid curriculum design. And the complex dynamics formula is decomposed into simple and understandable basic variables to the students. The students will overcome the fear of difficulty in the learning process. We can promote subjective initiative of students who are the main characters in the class.关键词：Polymer Preparation Engineering;Free radical polymerization;Initiator;Emulsion polymerization
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发布时间：2022-09-05
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