最新刊期
卷 35 ， 期 7 ， 2022
- 摘要：In recent years, with the development of the petroleum industry, sea oil spill accidents have frequently occurred, so the oil-water separation technology is constantly developing. Scholars increasingly favour porous metal materials in the field of oil-water separation due to their advantages of large separation flux, excellent mechanical properties and low price. This paper reviews the oil-water separation mechanism of superhydrophobic metal porous materials. Then, the research progress of preparing superhydrophobic porous metals by sol-gel method, deposition method, a dip coating method, hydrothermal method and other methods is mainly introduced, taking metal foams and metal omentum materials as examples. The advantages of superhydrophobic porous metal materials in oil-water separation are described. The future trends in treating superhydrophobic porous metal materials are also prospected.关键词：Superhydrophobic porous metal;Wettability model;Micro-nano structure;Oil-water separation
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发布时间：2022-09-09 - 摘要：Polypropylene is a typical semicrystalline thermoplastic polymer, which is widely used in industrial production and daily life. Under different crystallization conditions, polypropylene can mainly form three crystal structures: α, β and γ. β-PP has attracted much attention in scientific research due to its excellent toughness and thermal properties. At present, the most convenient and efficient method to induce β-PP is to add β-nucleating agents. In this paper, the mechanism of nucleating agents induced crystallization is introduced and the research status of β-nucleating agents for polypropylene is reviewed. The types of β-nucleating agents involved include inorganic substances, fused ring compounds, amide compounds, dicarboxylic acid salts, rare earth compounds, and polymer nucleating agents. Finally, several suggestions are put forward for the design and preparation of β-nucleating agents for polypropylene.关键词：β nucleating agents;Polypropylene;β-PP
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发布时间：2022-09-09 - 摘要：Rubber products such as tires, seal ring and conveyer belt, are complex composite material systems composed of rubber materials and a large number of fillers. The chain structure of rubber has a great influence on the properties of the products. Functionalized rubber can give rubber composites higher polymer-filler interaction, lower hysteresis, excellent filler dispersion, lower rolling resistance, excellent wear and fatigue resistance. In this paper, the functionalization methods, chain structure and properties of several general purpose synthetic rubbers, such as SSBR, IR and BR, were reviewed. The high performance direction and application prospect of general purpose rubbers were discussed.关键词：Functionalization;Polymerized butadiene styrene rubber;Polybutadiene rubber;Polyisoprene rubber
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发布时间：2022-09-09 - 摘要：Cellulose fiber has been widely used in all aspects of production and life due to its low cost, renewability, biodegradability and non-toxic characteristics. Traditional cellulose fiber textiles are easy to breed bacteria in daily use, which endanger human health. With the improvement of people's quality of life, people have more higher requirements for the performance of fiber textiles. Therefore,more and more attention has been paid to the research and development of antibacterial cellulose fibers. This paper reviews the research progress of antibacterial cellulose fibers in recent years. The preparation methods of antibacterial cellulose fibers and their antibacterial agent were introduced. The future research trend of antibacterial cellulose fiber is put forward, which provides reference for further research and development in this field.关键词：Cellulose fibers;Antibacterial agents;Anterbacterial mechanism;Modification methods
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发布时间：2022-09-09 - 摘要：Polymer fiber materials have been widely used in the field of concrete technology due to their excellent properties. Using polymer fibers to replace traditional fibers such as steel fibers and carbon fibers in 3D printing concrete materials is an important way to reduce costs and improve material properties. The addition of polymer fiber reduces the fluidity of the concrete mixture, also endows it with good buildability, and also significantly enhances the flexural performance and toughness of the concrete. Adding different types of polymer fibers has little effect on the compressive strength of concrete. From the perspective of affecting the performance of 3D printing concrete materials, the performance and research status of 3D printing concrete materials mixed with polymer fibers were reviewed. Mainly from polyethylene (PE) fiber, polypropylene (PP) fiber, polyvinyl alcohol (PVA) fiber and other polymer fibers, the research status of the working performance, mechanical properties and durability of 3D printing concrete materials was summarized. At the same time, the bonding strength and anisotropy between concrete layers were summarized and analyzed. The problems of polymer fiber reinforced 3D printing concrete materials are put forward, and the development of polymer fibers in 3D printing concrete materials is prospected.关键词：3D printing concrete;Polymer fiber;Workability;Mechanical property;Durability;Interlayer bonding strength
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发布时间：2022-09-09 - 摘要：In recent years, water-soluble aggregation-induced emission (AIE) polymer nanomaterials, as a new kind of intelligent materials, have great advantages in the fields of life science research because of their unique optical properties, environmental stimulus response and excellent biocompatibility. In this study, a new atom transfer radical polymerization (ATRP) initiator (TPE-BMP) with aggregation induced luminescence (AIE) properties was synthesized, and then the amphiphilic polymer TPE-PAA was successfully prepared by a method of ATRP active polymerization. Then, the pH responsive and AIE-active spherical nanoparticles TPE-PAA NP with a particle size of about 200nm were formed by a selfassembling process. The results show that TPE-PAA NP possesses excellent water solubility, good dispersion, dimensional stability and excellent AIE luminescence characteristics, and its solution fluorescence shows rapid sensitivity to environmental pH. More importantly, the fluorescent signals were significantly strong in HeLa cells after cells were incubated with TPE-PAA for 24h based on the characteristic of AIE fluorescence and low cytotoxicity. TPE-PAA NP could be internalized by the cancer cells and effectively track the HeLa cells for as long as 9 passages. So TPE-PAA NP was expected to be used as a fluorescent tracer probe material for living cells.关键词：Tetraphenylethylene;Poly(acrylic acid);Aggregation-induced emission;Nanoparticles;Cell tracing
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发布时间：2022-09-09 - 摘要：Based on typical 3-substituted benzoxazines, methyl, isopropyl and phenyl groups were introduced at the 2- position, respectively. Influences of 2-substituent on hydrogen bonds and properties of polybenzoxazine resins were studied by molecular dynamics simulation. Cross-linking structures of the four polybenzoxazines were established, and the free volume fraction, hydrogen bond, glass transition temperature, thermal expansion coefficient and density were calculated. The results show that the 2-substituent increases the free volume of polybenzoxazines and decreases the proportion of OH… N intramolecular chelating hydrogen bonds to a certain extent. The proportion of OH…O hydrogen bonds in methylsubstituted and isopropyl-substituted polybenzoxazines is increased, while phenyl substituted polybenzoxazine is difficult to form OH…O hydrogen bonds. The radial distribution function verifies the formation of hydrogen bonds. Steric hindrance, free volume and hydrogen bond affect the glass transition temperature and thermal expansion coefficient of polybenzoxazines. Polybenzoxazine substituted by the phenyl group at the 2-position has the highest glass transition temperature at 242.0℃, while the glass transition temperature of polybenzoxazine substituted by the isopropyl group is the lowest at 213.5℃, which is lower than that of unsubstituted polybenzoxazine.关键词：Polybenzoxazines;Substituent;Hydrogen bond;Molecular dynamics simulation
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发布时间：2022-09-09 - 摘要：Dielectric elastomer material is a new type of smart materials that can be widely used in sensors and actuators. The electrostriction is a crucial characteristic of the dielectric elastomer, which is affected by its dielectric constant and elastic modulus. Silicone rubber has low dielectric elastic modulus and fast strain response, but its electrostriction is small. Based on this situation, the modified TiO2/silicone rubber dielectric elastomer composite material was prepared with silicone rubber as the matrix and KH550 modified TiO2 as the filler, with its tensile properties, dielectric properties and electrostriction being tested. It is found that the addition of KH550 enables TiO2 to be uniformly dispersed in the silicone rubber matrix. By changing the content of KH550 and TiO2 added, the dielectric constant is increased, the dielectric loss is kept low, the elastic modulus is low, and the electrostriction is improved.关键词：Modified TiO2;Silicone Rubber;Dielectric elastomer;Electrostriction
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发布时间：2022-09-09 - 摘要：The core idea of Engineering Education is Student-Centered, Outcome-Oriented and Continuous Quality Improvement. The teaching content of the course of Polymer Physics is reorganized and restructured in order to solve the problem that students encounter, including mastering knowledge points scatteredly and failing to use them flexibly. The course content is introduced by Molecular Weight and Molecular Weight Distribution of macromolecules, the theoretical knowledge is organized by General Characteristic of Flexibility of Polymer Chain, and the content of polymer engineering applications is organized by various Interchain Aggregations and Molecular Motions———Individuality of Polymer Applications. The reconstruction of course content takes into account the profundity of professional theoretical knowledge of polymer physics and the extensiveness of practical engineering application of polymers, so as to cultivate students' ability to master and flexibly use engineering knowledge as well as develop the ability to analyze and solve practical engineering problems of polymers.关键词：Engineering education;Polymer physics;General characteristic of flexibility of polymer chain;Individuality of polymer applications
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发布时间：2022-09-09 - 摘要：This article takes the construction of first-class undergraduate courses as an opportunity, combined with the training requirements of "High-level, Innovative and Challenging", and designs a comprehensive and innovative experiment that integrates multidisciplinary knowledge—research on composite modification of biodegradable polymer. The experiment adopts the PBL teaching method with "Chaoxing Learning Link" as a digital tool, and guides students to self-learn, explore and research to complete the experimental design and operation through the way of problem introduction. Then the experiment cultivates students' experimental interest and hands-on ability, and arouses students' attention to biodegradable polymer materials. The analysis of teaching effect shows that the experiment helps to improve students' comprehensive quality, ability to solve complex engineering problems and innovation ability.关键词：Polymer materials;Comprehensive and innovation experiment;First-class undergraduate course;Biodegradable polymer
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发布时间：2022-09-09 - 摘要：The professional core curriculum group refers to a number of courses that play a decisive role for students to master professional core knowledge, cultivate professional core competence, and improve professional core competitiveness in the process of talent training, in order to achieve the goal of talent training. These courses occupy a core position in the professional curriculum system and play a leading role in the realization of the professional talent training goals. In view of the problems existing in the core curriculum group of material specialty, the corresponding promotion reform has been carried out. By optimizing the curriculum system, reforming the teaching content and methods, reforming of assessment methods, strengthening the construction of the teaching staff, and improving the quality evaluation system, the construction of the material-based professional core curriculum group has been compensated for, and it has laid a solid foundation for cultivating top-notch talents with scientific research innovation and international competitiveness.关键词：Material science and engineering;Core curriculum group;Cultivation of innovation ability;Teaching reform
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发布时间：2022-09-09 - 摘要：Engineering education certification is an important guarantee to improve the quality of engineering education in China. The evaluation of the achievement of graduation requirements is an important part and key content of engineering education certification, and it provides important basis for the reformation of specialty teaching and sustaining improvement. The output oriented evaluation mechanism for the achievement of graduation requirements has been established in the practice of engineering education accreditation process of polymer materials and engineering major in Ludong University. The evaluation responsibility organization, evaluation object, evaluation period, evaluation content, evaluation process, evaluation method, and the application requirements of the evaluation results are confirmed, and satisfactory results have been achieved. This paper describes the establishment and implementation of the evaluation mechanism for the achievement of graduation requirements. The students of polymer materials and engineering major that graduated in 2020 were selected as examples for the evaluation of the graduation requirements, which can provide a reference for the evaluation of graduation requirements of polymer materials and engineering majors, as well as other related majors.关键词：Engineering education certification;Graduation requirements;Evaluation mechanism;Polymer materials and engineering major
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发布时间：2022-09-09
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