最新刊期
卷 33 ， 期 9 ， 2020
- 摘要：As a new material, nanoparticles have shown unique application value in many fields. Polymeric nanoparticles are a branch of nanoparticles. In this paper, combined with the general introduction of nanoparticles, the preparation methods of polymer nanoparticles, the modification of bulk and surface properties, and the modification and regulation of the morphology structure of polymer nanoparticles are summarized. Finally, the important application value and broad application prospect of polymer nanoparticles in biomedical field are further illustrated by the research examples of polymer nanoparticles in recent years.关键词：Polymeric nanoparticles;Preparation methods;Regulation and control of morphology structure;Biomedica applications;Drug controled release;Tissue engineering
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发布时间：2022-08-31 - 摘要：In recent years, with the rapid development of my country's automotive, aerospace, military and other fields, the requirements for the performance of rubber parts have become higher and higher, especially in the high wear resistance of rubber.This paper summarizes the wear mechanism of rubber materials, and analyzes the factors affecting the wear resistance of rubber, such as Payne effect, internal friction, the generation and propagation of microcracks, and the surface structure of tread rubber. This paper introduces the research status of improving the wear resistance of rubber tire in recent years from four aspects: the blending and crystal structure of rubber compound, the binding effect of reinforcing filler and interphase interface, the surface treatment of tread rubber, the thermal effect and heat conduction of rubber tire, discusses the difficulties in the research of the wear resistance of rubber tire at present, and the related thinking of improving the wear resistance of rubber tire in the future.关键词：Rubber matrix;Filler;Wear resistance;Wear mechanism;Surface treatment;Thermal effect
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发布时间：2022-08-31 - 摘要：As a kind of soft material similar to human tissues, the three-dimensional hydrogels have been widely used in medicine, food, agriculture, forestry, cosmetics and other industries. Among them, hydrogels cross-linked by soft polymeric nanoparticles (MCHs) possess excellent strength and toughness, due to their unique energy dissipation mechanism via chain deformation under load. In this review, the microstructure and the toughening mechanism of traditional hydrogels and MCHs were discussed. The synthetic methods including macromolecular particles cross-linked hydrogels, micelle cross-linked hydrogels and hydrophobic association hydrogels were also described. The applications of MCHs in sensors, tissue engineering and drug release were summarized. Then the research trends and existing problems were prospected.关键词：Polymeric nanoparticles;Hydrogels;Toughening mechanism;Research progress
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发布时间：2022-08-31 - 摘要：Fertilizer not only improves crop yield, but also brings many problems. As the absorption of fertilizer by crops is a slow process, a large amount of fertilizer cannot be absorbed by crops in time, which causes environmental pollution. Therefore, effectively increasing the utilization rate of traditional chemical fertilizers can reduce environmental pollution. Coated controlled-release fertilizer can regulate the release rate of fertilizer nutrient under certain processes and conditions, significantly improve the utilization rate of fertilizers and reduce the serious environmental pollution caused by fertilizer loss. The membrane material of coated controlled release fertilizer is one of the key factors to determine the controlled release performance of fertilizers. In this paper the influence of the advantages and disadvantages of different membrane materials on the controlled release performance of fertilizers were compared and analyzed, and the nutrient release mechanism of coated controlled release fertilizers was explained. The problems in the practical application of coated fertilizers and the prospects of its future development were explained.关键词：Coating fertilizer;Controlled release;Membrane materials
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发布时间：2022-08-31 - 摘要：The complex polycrystalline systems consisted of stereocomplex (Sc) and α crystals were prepared by meltmixing PLLA with PDLA. The mechanism of inducing and forming the complex crystalline structure was studied under compound phenylphosphonic acid zinc salt (CNA) and two supercritical fluids. The results shown that increase PDLA content was a useful way to control the Sc/α polycrystalline structure. With the PDLA content increase, the crystallinity of Sc increase from 0.4% to 7.00%, but the crystallinity of α decrease from 17.19% to 1.29%. Meanwhile, CNA is an efficient crystal promoter and nucleator agent. With the adding of CNA, the crystallinity of both Sc and α increased. The supercritical N2 and CO2 are plasticizers. And the plasticization effect of CO2 is more obvious than that of N2. Under the two supercritical fluids, the Sc crystallization was suppressed, whereas the α crystallization was promoted. The co-existing of CAN and the two supercritical fluids could suppress the Sc crystallization. And, the α crystallinity was greatly increased. Eventually, the crystallinity of Sc and α could reach the maximum of 8.07% and 24.55%, respectively.关键词：PLLA;PDLA;Supercritical fluid;Stereocomplex;PPZn
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发布时间：2022-08-31 - 摘要：BF-g-SMA compatibilizer was prepared by grafting reaction as the compatibilizer of PET/BF blends. The optimum of BF-g-SMA compatibilizer and PET/BF mass ratio (BF content) were investigated by FT-IR, SEM, DSC and Melting Index. The results show that the dosage of compatibility agent and bamboo fiber are 6% and 20%, respectively. There are the smallest torque, the largest melting index and the best fluidity in the PET/BF blends. In addition, the surface of the blends are better smooth with good phase interface for bamboo fiber and the polymer matrix. Other than, the melting temperature, crystallization temperature, crystallization enthalpy and crystallinity are also suitable.关键词：Bamboo fiber;Polyethylene Terephthalate;Octadecyl methacrylate;Grafting;Compatibility
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发布时间：2022-08-31 - 摘要：Patent technology can reflect the current situation and process of innovation and development in a certain technology field and has become an important source of competitive intelligence. The paper focuses on patent technology of metallocene catalyst, and uses the Derwent Innovation patent search platform to analyze the curve of metallocene catalyst patent technology. Focusing on the analysis of the competitive situation of metallocene catalyst patents in different countries in the past 10 years, through the patent map technology, showing the hot topics, and combining the incopat patent value evaluation model to analyze the distribution characteristics of high-value patents of metallocene catalysts. It was found that the United States and Japan are producers of high-value patents on metallocene catalysts and has a strong sense of patent layout. China has a place in high-value patents about new performance polyolefins, but the technology is mainly concentrated in college and research institutes, and the application of technology is in a weak position.关键词：Metallocene;Catalyst;Patent analysis;Competitive dynamics;Frontier
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发布时间：2022-08-31 - 摘要：PVC resin needs a complicated formula when processing, though it has a high performance-price ratio and a fine comprehensive property. Rheological property of UPVC dry blend measured by a torque rheometer is an important means to simulate processing and formula design of PVC resin. Reasonable formula was first designed during experiment, and all ingredients of the formula were then mixed together to prepare UPVC dry blend according certain technics and finally measurement of rheological property was carried out. In the experimental teaching designing,the relationships between rheological curves of UPVC dry blend and extrusion process, and the degree of plasticization emphatically established. The total rheological curves of UPVC dry blend were proposed during compression, plasticization, degradation, crosslinking, decomposition and carbonization to ensure students understanding characteristics, formula design and processing of PVC resin entirely.关键词：UPVC dry blend;Rheological property;Experimental teaching;Total rheological curves
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发布时间：2022-08-31 - 摘要：Polymer physics, as a major part of polymer discipline system, is a core basic course for the specialties of polymer chemistry and physics, polymer materials and related materials, and also behaves as a necessary cornerstone course for the follow-up professional courses. Polymer physics, as an interdisciplinary subject, involves a large number of mathematics, physics, and chemistry knowledge, and exhibits characteristics of much more contents and points, complex and abstract theory, lack of systematicness and integrity, which makes it very difficult for students to learn, master and use. Therefore, in this paper a teaching method of using glass transition temperature (Tg) as the series connection was introduced in polymer physics teaching. To be specific, by using the concept of glass transition temperature (Tg) and the relationship between the internal molecular chain movement with conformation (flexibility) change and external macroscopic properties as series connection to help college students quickly learn and master the basic knowledge of polymer physics, and establish a systematic polymer knowledge framework system.关键词：Polymer physics;Glass transition temperature (Tg);Series connection;Conformation (flexibility);Structure and properties
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发布时间：2022-08-31 - 摘要：Emulsion polymerization is one of the most important sections in polymer chemistry course. The aim of this section is training the capabilities of late recipe designing and promoting the understandings of students about free radical polymerization. However, the understanding of emulsion polymerization concepts is difficult for many students due to the complexities of particle nucleation mechanism and kinetic. Authors analyzed the process of particle nucleation and growth in the emulsion polymerization through combining the knowledge of free radical polymerization from polymerization recipe view. This manuscript can help student understand the particle nucleation mechanisms and kinetics in emulsion polymerization.关键词：Polymer chemistry;Emulsion polymerization;Nucleation mechanism;Kinetic
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发布时间：2022-08-31 - 摘要：Engineering education accreditation is an efficient method for majors to enhance the quality of talent cultivating and specialty construction. It also lays a significant foundation for our universities to re-focus on the undergraduate education and to continuously improve the college education standard. First-class undergraduate specialty construction provides strong support for cultivating high-quality undergraduate talents. In this paper, polymer materials and engineering specialty for Wuhan institute of technology was chosen as a sample. The effect of engineering education accreditation on the education reform, faculty construction, graduate achievement and the social position of polymer materials and engineering specialty was discussed by considering the development tendency and the inner requirement of undergraduate construction. In addition, the achievement of polymer materials and engineering specialty was summarized during the process of engineering education accreditation. The education management and the talents cultivating method will greatly prompt the first-class undergraduate specialty construction in the process of Engineering Education Accreditation.关键词：Engineering education accreditation;First-class undergraduate education;Talent cultivation quality;Polymer materials and engineering
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发布时间：2022-08-31 - 摘要：Polymer material processing is a compulsory course of polymer materials and engineering discipline. This course is favorable to carry out ideological and political education because of its rich elements and flexible modes. The advantages, elements and modes of implementing curriculum ideological and political education are discussed to exploration on the moral education in polymer material processing course. Teachers should make great efforts to deeply excavate the moral connotation and education elements contained in the curriculum, and organically integrate the ideological and political education into classroom teaching through case teaching, seminar, visiting practice and curriculum experiments. Furthermore, the ideological and political education should be implemented based on the main contents and in combination with curriculum contents, to realize the fundamental task of establishing morality and cultivating people in universities.关键词：Polymer materials;Molding processing;Professional knowledge;Ideological and political education
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发布时间：2022-08-31
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