最新刊期
卷 34 ， 期 7 ， 2021
- 摘要：Blood-contacting devices have been widely used in the clinical diagnosis and treatment of cardiovascular disease, which has the highest mortality rate in human beings. Blood compatibility is the most important evaluation index for blood-contacting materials. Improvement of blood compatibility is always the main task and central content for bloodcontacting biomaterials, which is of great significance to economic development, social progress and human health. Herein, the theoretical basis of blood compatibility are systematically reviewed. The improvement strategies (including biomimic, bioinert, and bioactive strategies) and composite techniques of blood compatible materials are emphatically described. In the summary, the perspectives of blood compatibility research are prospected.关键词：Blood compatibility;Blood-cotacting materials;Review
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发布时间：2022-08-30 - 摘要：As an emerging environment-friendly material, Transparent wood has both the sustainable renewable properties of natural wood and the excellent optical properties of glass. The strength of transparent wood is higher than that of wood, its toughness is better than glass, and is more energy-saving and environmentally friendly than plastic. The preparation and application of wood has achieved rapid development in just a few years. New functional properties such as magnetic properties, fluorescence, and UV resistance can also be obtained by combining functional nanoparticles with transparent wood. Based on the properties of transparent wood, this paper analyzes the effects of wood properties, bleaching methods, polymer types, interface factors and added substances on transparent wood, and summarizes the applications of transparent wood in construction, luminescent materials, photovoltaic materials, magnetic materials and energy storage materials. Finally, it is pointed out that systematic research on its corrosion resistance, flame retardancy, and light stability, and finding industrial production methods are the focus of future research, in order to provide theoretical basis and practical direction for the control of properties and further research of transparent wood.关键词：Transparent wood;Composite material;Wood bleaching;Polymer infiltration
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发布时间：2022-08-30 - 摘要：Rubber surgical gloves are usually used in aseptic operating rooms, which is one of the larger use of latex gloves varieties. Natural rubber latex surgical gloves have excellent comprehensive performance and have a long history of application, however, natural rubber latex contains allergenic proteins, which easily cause some medical staff allergic reaction affecting their health. The development of synthetic latex surgical gloves without proteins and synthetic latex surgical gloves made from synthetic rubber by emulsification process can effectively avoid the allergic reaction caused by protein in natural rubber latex. So far, synthetic latex surgical gloves mainly include nitrile gloves, neoprene gloves and polyisoprene latex surgical gloves, which performances affected by the types of materials. So, the development of nitrile latex gloves, neoprene latex surgical gloves and isoprene latex surgical gloves are reviewed in this paper.关键词：Natural rubber latex;Synthetic latex;Artificial latex;Surgical gloves;Hypersensitivity;Wear comfortability
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发布时间：2022-08-30 - 摘要：Since activated carbon has a high surface area, developed pore structure, excellent surface chemical properties and superior adsorption capacities, it has broad application prospects in the chemical, pharmaceutical, food, metallurgical industries, etc. The methods of preparing activated carbon from agricultural waste, including physical activation and chemical activation, were mainly introduced. The effects of activation temperature, activation time and impregnation ratio of activator on the preparation of activated carbon were discussed. The application of agricultural waste activated carbon in the removal of dyes, metal ions and volatile organic compounds and the adsorption and storage of gases were summarized. Finally, in view of the current research deficiencies, the aspects of raw material development, the relationship between process and performance, process integration optimization, and product application expansion were prospected.关键词：Agricultural waste;Activated carbon;Activation;Adsorption;Application
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发布时间：2022-08-30 - 摘要：The granule morphology and its physicochemical properties of potato starch were studied after superfine grinding with a fluidized bed jet mill. The granule morphology, particle size and distribution, powder density and compressibility, pasting and thermal properties, solubility,swelling power and freeze-thaw stability were characterized using granularity analysis, scanning electron microscopy (SEM), X-ray diffraction(XRD), rapid viscosity analyzer (RVA) and differential scanning calorimetry (DSC). It was found that through the jet milling superfine grinding processing, the shape of potato starch granules changed from smooth polyhedron to rough, angles and cracks. The particle shape becomes irregular, the particle size decreases and the size distribution is uneven. Micronized powders prepared at 3000r·min-1 had an average particle from 39.75 to 13.38μm. The bulk density and tap density decreased with increased classifier frequency, and the compressibility of all the starch samples decreased. Jet milling did not change the crystal structure of the starch, but the crystallinity decreased. Jet milling reduces the attenuating viscosity and recovering viscosity of starch paste, the hot and cold paste stability of starch are better. And the gelatinization temperature, heat absorption enthalpy and freeze-thaw stability of starch are reduced, but the solubility and expansion degree of starch are improved. This study provided theoretical basis and technical support for improving the content and processing technology of potato starch, respectively.关键词：Jet milling;Potato starch;Granule morphology;Physicochemical properties
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发布时间：2022-08-30 - 摘要：The anti-aging properties of two kinds of room-temperature curing polyurethanes foams prepared by chemically grafting hindered phenolic antioxidants (3, 5-ditert-butyl-4-hydroxybenzoic acid) and physical blending of pentaerythritol tetrakys 3-(3,5-ditert-butyl-4-hydroxyphenyl) propionate were compared under hydrothermal and dry heat condition. The results show that the initial strength of polyurethane foam grafted hindered phenol antioxidant was 0.31MPa under the condition of hydrothermal aging, and the tensile strength of the material increased to 0.42MPa due to further cross-linking and curing under heating aging conditions after 1 week of aging, and the tensile strength reached 0.40MPa at the age of 52 weeks. The initial strength of the polyurethane foam grafted with hindered phenol antioxidant was 0.31MPa, while the tensile strength of the material reaches 0.38MPa after 4 weeks of aging under dry heat condition, and the tensile strength of the material reaches 0.32MPa after 52 weeks of aging. After 52 weeks of hydrothermal aging, the strength retention rate of the polyurethane foam was 129% with the phenolic antioxidants grafted while 90% with the traditional antioxidants added. The strength reduction rate of both grafted and physically blended polyurethane foams is lower than that of pure polyurethane foams without antioxidants and the anti-aging properties of polyurethane foams grafted with hindered phenol antioxidants was improved significantly.关键词：Polyurethane;Hindered phenol;Grafting;Anti-aging
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发布时间：2022-08-30 - 摘要：Effects of alkalli treatment(AT), modification by benzoic acid(BA) or/and stearic acid(SA) on mechanical properties, thermal stability, rheological properties, wettability and water uptake of wheat straw powder(WSP) reinforced polypropylene(PP) composites(WSP/PP-CM) were studied. Results show that, when WSP was alkalli treated, the tensile trength(TS), flexural strength(FS), impact strength(IS), initial decomposition temperature(Ti) of WSP/PP-CM and the contact angle(θ) between WSP/PP-CM and distilled water can be increased, respectively, while the balance torque(BT) and water uptake(WU) decreases. These may be due to the increased surface activity and enhanced hydrophobicity of the WSPthe by AT. After alkalli treatment, if the WSP was modified by BA or SA again, TS, FS, IS and Ti of WSP/PP-CM can be increased while BT decreased. After alkalli treatment, if the WSP was modified by BA and SA together again, TS, FS, IS and Ti of WSP/PP-CM can be increased by 41.21%, 32.02%, 38.68% and 35.7℃ while BT decreased to 9.7N· m. The hydrophobicity of the composites was better than that of the unmodified WSP/PP-CM, although the effect was less than that of AT alone.关键词：Wood-plastic composite;Wheat straw powder;Polypropylene;Alkalli treatment;Benzoic acid;Stearic acid
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发布时间：2022-08-30 - 摘要：The mixture of Polycarbonate (PC), polylactic acid (PLA) and trichloromethane (CHCl3) were accounted for the oil phase and polyvinyl alcohol (PVA) solution was acted as the aqueous phase, which were prepared by phase separation for PC/ PLA composite microspheres. The factors of CHCl3 concentration, water-oil ratio, PVA mass fraction and PC/PLA ratio on the morphology and structure were investigated. The results showed that the composite microspheres with small particle size, uniform distribution and surface are formed when the concentration of CHCl3 was 2g/mL, water/oil mass ratio was 4∶1, PVA mass fraction was 1% and PC/PLA mass ratio are 1/1. Under the appropriate conditions, PC and PLA intermolecular chains have the same intermolecular force and strong diffusion ability, and the PC/PLA composite microspheres are prepared by synergistic and consistent crystallization, which promotes nucleation-crystallization.关键词：Polycarbonate;Poly(lactic acid);Composite microsphere;Phase separation
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发布时间：2022-08-30 - 摘要：The active center of carbon cationic polymerization is usually carbon cation, and the initiator of carbon cationic polymerization must be the compound producing cationic active species, including proton source compounds such as carboxylic acid, alcohol and trace water, and carbon cation source compounds such as halohydrocarbon, carboxylic acid ester and ether. However, because of the outdated materials used, carboxylic acid, trace water, halogenated hydrocarbon and carboxylic acid ester etc. were mistakenly defined as secondary initiators in several versions of current "polymer chemistry" textbooks, while strong Lewis acids such as BF3 were defined as the main initiators. According to the principle of ionic polymerization, proton source compounds and carbon cation source compounds are the true initiators, while strong Lewis acids are only activators, catalysts or co-initiators. Based on the long-term teaching experience, this paper tries to analyze the basic principle and initiation system of cationic polymerization from the chemical principle. It is hoped that the latest research results in this field can be incorporated into undergraduate teaching, so as to achieve "teaching alone with innovation" and to cultivate modern polymer young talents with solid professional theoretical foundation.关键词：Cationic polymerization;Initiator;Proton donor;Carbon cation donor;Lewis acid activator
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发布时间：2022-08-30 - 摘要：The Origin software was used in teaching of polymer chemistry. And attempts was made to develop students’ modern tool using awareness and skills, cooperative awareness and ability, and communication and expression skills required by the professional certification of engineering education via well chose and designed team homework and flipped classroom. While finishing these team homework, the students would have their above-mentioned awareness and ability being trained, through learning by doing, learning by teaching, learning while doing and thinking while learning, and learn how to solve polymer chemistry related problems with Origin software by practicing. And thus, have the concepts of "learning-centered" and "student-centered" being effectively implemented in teaching design and teaching practice.关键词：Polymer chemistry;Teaching;Team homework;Origin sortware;Awareness development;Ability training;Flipped classroom;Iterative learning;Metacognition
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发布时间：2022-08-30 - 摘要：Polymer Materials Research Methods is one of the core courses required for polymer materials and engineering major. It has the characteristics of emphasizing both theory and practice. This article mainly carries on the reform and the exploration from the teaching content, the teaching form and method, the curriculum appraisal, the teaching feedback and so on from the perspective of engineering education professional certification. The theoretical basis and innovation ability of students can be improved through theoretical study, case analysis and practical training, and the scientific research methods of students can be formed based on the practice of synthesis, characterization and result analysis of polymer materials. Therefore, it meets the requirements of students' abilities for engineering education professional certification.关键词：Polymer Materials Research Methods;Teaching reform;Engineering education professional certification
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发布时间：2022-08-30 - 摘要：The teaching mode of "double class double credit" refers to the addition of the second class practice content on the basis of the first class teaching around the course objectives. Students taking this course will receive both first class and second class credits as required by the syllabus. Based on the analysis of course characteristics of polymer modification, the original "one-way output of teachers "teaching model is switched into" topics as goal orientation, teachers' teaching and students’ practical parallel" teaching mode. Polymer modification is first joined the "double class double credit" course listing, and the characteristics of this kind of teaching mode are illustrated through the "flame retardant modification "and "enhanced modification" of the course.关键词：Double class double credit;Polymer modification;Teaching mode
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发布时间：2022-08-30 - 摘要：To follow the new trend of the polymer industry, "Computer Applications in Material Science" , a featured professional course, was offered for the students of polymer materials specialty in a lot of universities, which plays an important supporting role in improving students' ability to solve practical problems in polymer materials by using computer. This article introduced the experience and inspiration of the teaching reform and the course construction from the perspectives of construction of the course system, optimization of teaching content, application of multiple teaching methods, and evaluation of teaching effects, based on the characteristics of polymer materials specialty and the practice of teaching reform over the years. In addition, it also introduced the application effects of various online teaching methods in this course during the epidemic. We hope it can provide a useful reference for the course reform of relevant colleges and universities.关键词：Polymer material specialty;Computer applications in material science;Teaching reform;Course construction
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发布时间：2022-08-30
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