最新刊期
卷 35 ， 期 2 ， 2022
- 摘要：The chelating monomer GMIDA not only has the structure of "semi EDTA" which has strong chelating effect on metal ions, but also can introduce functional chelating groups to the surface of materials through double bond covalently. This kind of functional polymer greatly expands the application range of the material themselves. In this review, firstly, the properties and synthesis methods of GMIDA polymers are briefly introduced, and then the applications of GMIDA polymers in various fields are analyzed. For example, based on the special binding of metal ions to proteins, GMIDA chelating polymers are used in the separation and purification of proteins, the specific recognition of glycopeptides, and the sustained-release of protein therapeutic drugs. The antibacterial effect of p(GMIDA) chelating metal ions is better than that of its anionic polymers, in this reason, GMIDA chelating polymers are used in the field of antibacterial materials. Based on the reversible adsorption and desorption behavior between metal ions and chelating polymers, GMIDA chelating polymers are used in many other fields, such as active packaging materials, sewage treatment, lithium-ion batteries, catalytic chemistry, etc. In addition, GMIDA metal chelating polymers are also widely used in crystal form control, trace metal detection, functional coatings and material modification. In the end, the future development of metal chelating polymers is briefly reviewed and prospected.关键词：Metal chelating;Protein binding;Catalytic chemistry;Antibacterial materials;Active packaging
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发布时间：2022-09-09 - 摘要：Numerous waste rubbers are generated every years in China, which results in serious environmental pollution. As the effective way to recycle waste rubber, the research and application of rubber powder have attracted wide attention. The technologies on modification of desulfurization regeneration and surface activation in rubber powder and the application of rubber powder in thermoplastic elastomers are introduced, an outline of preparation methods of the thermoplastic elastomers are given and the difference between melting blending method and dynamic vulcanization method is compared in this article. What’s more, it summarizes the research status of rubber powder based thermoplastic elastomers and significantly introduces its compatibility mechanism. Moreover, the effects on mechanical properties of thermoplastic elastomers by the processing technology and the compatibilization system are analyzed as well. Future application and development of modification on rubber powder and rubber powder/plastic thermoplastic elastomers are also taken a prospection.关键词：Waste rubber;Modification of rubber powder;Thermoplastic elastomers;Compatibility;Dynamic vulcanization
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发布时间：2022-09-09 - 摘要：Rubber products will suffer degradation, crosslinking and other aging behaviors during the using process by heat, oxygen, thermal oxygen, light, irradiation and mechanical stress. Different kinds of rubbers have different aging mechanisms because of their various use environment and requirements. In this paper, the chemical mechanism, research methods, prediction methods and models of rubber aging were introduced. The research progress of aging behavior of different kinds of rubber and rubber/rubber blends in recent years was reviewed. The review of rubber aging behavior and mechanism is helpful to understand rubber aging systematically, and provide suggests for improving the aging resistance and preparing more excellent aging resistant rubber materials.关键词：Rubber;Aging behavior;Aging mechanism
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发布时间：2022-09-09 - 摘要：With the improvement of living standards and the aggravation of aging, the use of disposable diapers has increased significantly, and has become the third largest domestic solid waste after kitchen waste and plastic. Therefore, the treatment and recycling of waste diapers is an important topic. Although there are some recycling cases of waste diapers in advanced countries, there are few papers on the recycling of waste diapers in China. Therefore, this paper introduces the present situation and the structure of waste diaper disposal, and summarizes the research progress in the field of waste diaper recycling, including overall recovery, simple disassembly recovery and complete separation recovery technology. Moreover, the potential applications of waste diaper disposal in fuel preparation by pyrolysis, mixed composting, soil quality improvement and catalyst preparation were also reviewed.关键词：Waste diapers;Fluff pulp;Super absorbent polymer;Recovery;Separation
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发布时间：2022-09-09 - 摘要：A novel slow-release fertilizer (SRF) encapsulated by hybrid aerogel was prepared via a simple and effective freeze-drying method. The hybrid aerogel was characterized by Fourier transform infrared spectroscopy (FT-IR), thermal gravimetric analysis (TG), X-ray powder diffraction (XRD), scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS) techniques. The effects of MOF(Cu)@biochar content, pH and different saline solutions on swelling behavior of hybrid aerogel were studied. The water-retention capability of soil with 2%(wt) SRF was investigated. The cumulative release ratio of SRF in soil was 79.4% at 30th day. The release behavior of fertilizer in soil conformed to the synergistic mechanism of non-fickian diffusion and cation exchange.关键词：Hybrid aerogel;Swelling;Biochar;Slow-release N-fertilizer
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发布时间：2022-09-09 - 摘要：For a class of modified terpolymerization system in which the ratio of two primary monomers is kept constant and a trace or small amount of third monomer is involved, the two primary monomers are looked upon as one monomer species, and then the system is treated as a pseudo-binary copolymerization of the "primary monomer" with the third monomer. By kinetic concept derivation method and direct derivation method from simple terpolymerization formula,the formulae for calculating the equivalent reactivity ratios of pseudo-binary copolymerization are derived respectively, and the results obtained by the two methods are consistent. Some terpolymerization examples reported in literature are calculated and the correctness of the proposed method is verified. In this way, not only the calculation of such terpolymerization composition is simplified, but also the selection of the third monomer can be guided, the reactor model can be established, the content change of the third monomer can be predicted, and the reasonable addition method can be guided. It is also found that the terpolymerization based on simple steady state assumption has the property that it can be treated by pseudobinarization.关键词：Terpolymerization;Pseudo-binary copolymerization;Equivalent reactivity radio;Simple steady-state assumption;Modeling
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发布时间：2022-09-09 - 摘要：The functional layer of protective mask is melt blown nonwoven fabrics. In order to meet the requirements of high efficiency and low resistance, it needs to be treated with corona charging and hydro charging. However, there are few reports on electret mechanism, especially hydro charging. In this paper, the filtration efficiency and surface charge distribution of corona charging and hydro charging nonwoven fabrics were compared at first. Then the hydro charging experiment was simulated and the influences of the conductivity of water was explored. The results showed that compared with corona charging, hydro charging can significantly improve the filtration efficiency of the melt blown nonwoven material, especially low areal density melt blown materials. The filtration efficiency of meltblown nonwoven fabric decreased with the increase of the conductivity of water significantly. It is believed that meltblown nonwoven fabrics can be negatively and positively charged simultaneously by the hydro charging process according to the surface charge potential measurement.The review also indicated that the surface of hydro charging and corona electret melt blown nonwoven materials can generate positive and negative charges, and they are randomly distributed.关键词：Corona charging;Hydro charging;Surface charge;Melt blown nonwoven fabric
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发布时间：2022-09-09 - 摘要：Leakage water is called the first stubborn disease of tunnel engineering by the construction industry. The saying of "ten tunnels and nine leaks" is widely spread among tunnel maintenance personnel. Leakage water can be called the "big moth" of tunnel engineering quality. It is worth noting that waterproof materials and waterproof construction technology are not independent of each other. Matching them is of great significance to prevent water leakage. This paper introduces the structural design of "sandwich" waterproof material, and successfully simplifies the two-step construction method of tunnel waterproof material into one-step construction method; At the same time, the R & D and production process of materials are discussed from the aspects of formulation design, preparation process and physical and mechanical properties test by using the concepts of "stripping zone theory "and "hot melt pressure sensitive" .关键词：Tunnel waterproof layer;Free stripping area;Hot melt pressure sensitive;Reverse osmosis;Buffer layer;Bonding zone
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发布时间：2022-09-09 - 摘要：Due to the incompatibility between PP and natural plant fibers, the performance of WPC is not very ideal, which has become a hot research object in recent years, including the pretreatment of natural plant fibers, the addition of inorganic particles/fibers and the addition of compatiblers. Pretreatment of natural plant fibers can break the hydrogen bonds in the fiber network structure, remove the wax and oil covering the surface of fibers, increase the surface roughness of fibers, and improve the physical connection between fiber and polymer; adding inorganic particles/fibers can improve the thermal, mechanical and flame retardant properties of WPC; the addition of compatibilizer can enhance the interface connection in WPC and improve the performance of WPC. The research status of polypropylene base WPC in recent five years is reviewed, providing reference for the preparation of cost-effective polypropylene base WPC.关键词：Polypropylene base;Natural plant fiber;Wood plastic composites;Pretreatment;Compatiliizers
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发布时间：2022-09-09 - 摘要：This paper focuses on the pattern of online teaching of polymer modification during the COVID-19 pandemic. Through the combination of online theoretical teaching and developing experiment at home, together with the QQ classroom and chaoxing learning platform, the online teaching of polymer modification integrating "theory+practice" was carried out. The experiments that need to be completed in the laboratory were turned into life, which not only trained students' practical ability, but also tried to make their own food. Besides labor education, our online teaching improves students' interest in learning. These explorations and practices are expected to provide some tips for the online teaching of other chemistry courses during the COVID-19 pandemic.关键词：QQ classroom;Online teaching;Experiment at home;Labor education
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发布时间：2022-09-09 - 摘要：Under the guidance of system theory, safety impact assessment is a "inquiry-based problem approach" , which is from whole to part and follow the layers of in-depth as the system entirety, the system structure and the system elements; while the problem-solving process of practical application is from part to whole and concerns on the "systematic thinking model" comprehensively like the uncertainty distribution analysis of system elements, the dynamic changes of system structure and the description trend analysis of system entirety. By the mapping and inverse mapping between system theory and engineering problem, the assessment method of safety impact in solving complex polymer materials engineering problems is established in this paper. Taking the assessment of death probability of polymer material fire accident as an example, the design and application of safety impact assessment for specific engineering problem solutions is described in detail.关键词：Systematic thinking model;Complex engineering problem;Engineering education professional certification;Safety issue
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发布时间：2022-09-09 - 摘要："copolymerization" is one of the priority chapters in polymer chemistry teaching. Beginning from the study of the significance of "copolymerization" , this paper discusses in detail the function of the derivation of the differential equation of the composition of binary copolymer, the introduction of the reactivity rate and the discrimination of the type of copolymerization behavior in the teaching process of "copolymerization" , and expounds the understanding of the main line of teaching and learning of "copolymerization" . And taking the actual production process of acrylonitrile-butadiene-styrene copolymer (ABS) as an example, this paper proposes the question-asking teaching method to guide students to clarify the learning content, sets the problem from shallow to deep focusing on the core content of how to synthesize homogeneous copolymers, deepens the students' understanding, integration and application of the knowledge points and embodies the practice of high gradation, innovativeness and challenges in the teaching of "copolymerization" .关键词：Copolymerization;Main line of teaching and learning;High gradation;Innovativeness;Challenges
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发布时间：2022-09-09 - 摘要：In the engineering education accreditation, it emphasizes student-centered and focuses on cultivating the students ability to solve complex engineering problems. A comprehensive polymer material and engineering experiment (preparation and property test of high temperature vulcanized methyl vinyl silicone rubber) is designed. The experiment requires students to clarify the basic principles of the experiment through literature research and group discussion, independently design experimental programs to prepare methyl vinyl silicone rubber products and detect the molecular weight and thermal behavior of polysiloxane and mechanical properties of vulcanized silicone rubber, and write the experimental report in the form of scientific research papers. The experiment integrates the knowledge of many professional courses and practical courses such as polymer chemistry, polymer physics, polymer processing principles, polymer characterization and testing, literature retrieval and scientific paper writing, which includes a series of parts such as data search and arrangement, group discussions, experimental operations, and paper writing. The experiment is highly comprehensive in theory and practice, which can cultivate students’ ability to comprehensively utilize the knowledge they have learned to solve practical problems.关键词：Engineering education accreditation;Polymer materials and engineering;Comprehensive experiment;Methyl vinyl silicone rubber
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发布时间：2022-09-09 - 摘要：Polymer Chemistry is very close to our social life, which aims to cultivate talents with the abilities of molecular structure design, synthetic route design, structure performance study, and the ability to apply the theoretical knowledge to solve practical problems based on the organic chemistry, inorganic chemistry, physical chemistry, and analytical chemistry. Polymer Chemistry plays a good role in the teaching of basic chemistry and polymer physics. At the same time, in order to adapt to the education concepts of facing modernization, facing the world, and facing the future, bilingual teaching model is a key and hot issue in the education innovation of universities, it is also one of the development trends of undergraduate education in universities. Therefore, based on the experience of bilingual teaching, the authors make a preliminary study on how to enhance students' interest in learning, how to improve the quality of bilingual teaching, and how to enhance the students' global competitiveness.关键词：Polymer chemistry;Bilingual education;Educational reform
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发布时间：2022-09-09
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