最新刊期
卷 34 ， 期 2 ， 2021
- 摘要：The blood compatibility of biomaterials is one of the important criteria for the successful clinical application. When materials come into contact with blood, they will cause a series of complex reactions, such as hemolysis, coagulation and immunity, and the mechanism is complex and affected by a variety of factors. Therefore, biocompatibility evaluation of materials should be conducted according to ISO 10993-4 before their clinical application. Blood compatibility evaluation is an important part of it, but there is no unified evaluation standard and index so far. In this paper, the main methods of blood compatibility evaluation in recent years were summarized to provide reference for the establishment of biomaterial blood compatibility evaluation system in the future.关键词：Biomaterials;Blood compatibility;Evaluation
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发布时间：2022-08-30 - 摘要：Polyvinyl alcohol (PVA), as a widely used water-soluble polymer, possesses good gas barrier properties, thermal stability, and biocompatibility. Therefore, the modified PVA film has become an important research direction. However, due to the large number of hydrophilic groups (—OH) in the PVA structure, the weak mechanical properties and poor water resistance of hydrophilic PVA film seriously limit its practical applications. This article summarizes the methods of water resistance modification of PVA film at home and abroad, such as esterification crosslinking, aldol condensation, compound plasticization, nano-reinforcement and blending, etc., which will help to further promote the research of PVA water resistance modification, provide a reference for the design and preparation of high-performance PVA film and further expand the application range of PVA film.关键词：PVA film;Modification;Water resistance;Mechanical properties
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发布时间：2022-08-30 - 摘要：Plastic products have become the major commodities on a global scale and have infiltrated almost every aspect of human life. Meanwhile, the rapidly accumulated waste plastics have caused a series of negative impacts on the terrestrial and ocean environment. Noticeably, waste plastic has the dual characteristics of resources and waste. The improvement of recycling quality and quantity of waste plastics is of great significance to the efficient utilization of resources, sustainable development and environmental protection. Besides, the Herein, the sorting methods commonly used for waste plastics were introduced,the research progress of chemical (such as chain extension, grafting and crosslinking reaction) and physical modification (such as of waste plastics were reviewed,and the problems of the reuse of waste plastics were also analyzed.关键词：Waste plastics;Recycling;Sorting;Chemical modification;Physical modification
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发布时间：2022-08-30 - 摘要：As is known to all, the carbon fiber (CF) was used as a reinforcing body of composite materials due to its excellent mechanical properties in recent years. However, the CF surface lacks polar groups and appears chemical inert on the CF surface so that the interfacial adhesion between the fiber and the resin was poor. In order to improve this serious problem, it was obliged to modify the surface properties of the CF. The GO and CNT have a large specific surface areas, the surface contains a large number of polar groups. If they were introduced into the CF surface, which can effectively improve the interface problem between CF and EP. The graphene oxide(GO) and carbon nanotube (CNT)/resin (EP) composites were successfully prepared by the electrophoretic deposition technique, and all kinds of excellent interface properties were shown. In this paper, the applied present situation of CNT and GO were deposited on the CF surface by electrophoretic deposition method at home and abroad are summed up and analyzed, on the above-mentioned basis, the research trends of the modification CF by the electrophoretic deposition carbon nano-materials are discussed,then the prospects of surface modification of CF by electrophoretic deposition methods are forecasted.关键词：Electrophoretic deposition;Graphene oxide;Carbon nanotube;Carbon fiber;Surface modification
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发布时间：2022-08-30 - 摘要：Using epoxy resin (EP) to coat sodium bicarbonate (SB) to synthesize microcapsule sodium bicarbonate, Through infrared spectroscopy (FTIR), scanning electron microscope (SEM), differential scanning calorimeter (DSC) and thermogravimetric analyzer (TG) and other characterization methods, the synthesis reaction temperature, the quality of epoxy resin and sodium bicarbonate were analyzed the structure, surface morphology and thermal decomposition characteristics of microcapsules sodium bicarbonate. Results show that the reaction temperature is 70℃, the quality of the epoxy resin with sodium bicarbonate ratio of 1∶5, modification of sodium bicarbonate effect is ideal, the surface morphology is neat, the initial temperature from 118℃ to 154.9℃, decomposition temperature range from 46.3℃ to 24.8℃. The micro-foamed polypropylene material prepared by using microcapsule sodium bicarbonate has better foaming quality.关键词：Sodium bicarbonate;Microcapsule;Epoxy resin;Decomposition temperature
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发布时间：2022-08-30 - 摘要：The classical free radical binary polymerization formula was processed by data processing software (maple), and three sets of graphs of copolymerization relationship between binary monomers were calculated and plotted. The first graph is the free radical copolymerization curve F1-f1(monomer unit concentration-monomer concentration)of the binary monomer, the second graph is the relationship between the average monomer composition (Fp) and the f1, and the third graph is the relationship between polymer conversion rate (C) and f1. Through two groups of representative copolymerization examples, non-ideal copolymer (styrene-acrylonitrile copolymer) with constant ratio point and non-ideal non-constant ratio copolymer (styrene-vinyl acetate copolymer) respectively,the mapping steps were showed and the polymer conversion process under different race polymerization rate was analyzed.关键词：Maple software;Free radical copolymerization;Conversion;Reactivity ratio
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发布时间：2022-08-30 - 摘要：Hydroxyapatite/chitosan (HAP/CS) composite adsorbent was prepared by the in-situ co-precipitation method. The physical and chemical characteristics of adsorbents with and without CS were characterized via SEM, XRD, IR, and N2 adsorption-desorption isotherms. The results showed that crystal form of HAP has no change after composition, but the crystallinity was decreased. Moreover, the as-prepared composite has an irregular concave-convex structure with increased surface roughness. The specific surface areas also increased from 106.75m2/g to 127.58m2/g, and the pore size of composite adsorbent was 10~50 nm, which belongs to mesoporous. Both models, including the Langmuir and the Freundlich, could predict the experimental data conducted. However, the Langmuir model had a better correlation coefficient than the Freundlich model. The kinetic adsorption data showed that the adsorption process follows the pseudosecond- order kinetic. The thermodynamic and kinetics parameters were obtained. ΔG0<0、ΔH0>0 and ΔS0>0 indicated that the adsorption was a spontaneous and endothermic process with increased entropy, and a higher temperature would benefit the adsorption. The adsorption's activation energy (Ea )=15.03kJ·mol-1 and migration energy (E )=7.639kJ/mol indicated that the adsorption was mainly physical.关键词：Hydroxyapatite;Chitosan;Defluoridation;Adsorbent
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发布时间：2022-08-30 - 摘要：Phosphate ester modified acrylate (PAMA) emulsion was synthesized by using glycol methacrylate phosphate (HEMAP) as functional monomer, N-acrylamide as crosslinking monomer, methyl methacrylate (MMA), acrylic acid (AA) as main polymerization monomers under the action of polymerizable surfactant by using the emulsion polymerization method. Effect of the different content of HEMAP on the particle size, thermal resistance, and corrosion resistance of the PAMA emulsions and coatings were demonstrated by the particle size analyzer, thermogravimetric analyzer, electrochemical tests and salt spray tests. The results showed that, with the content of HEMAP increased from 0.5% to 2%, the particle size decreased from 883.7 nm to 427.9 nm, and the weight loss rate decreased. Tafel polarization curves and electrochemical impedance spectroscopy showed that with the addition of HEMAP, the corrosion potential increased, the corrosion current decreased, and the impedance value increased, which illustrated that the corrosion resistance of metal substrate improved by coating the PAMA emulsions.关键词：Acrylate modification;Phosphate functional monomer;Corrosion resistance
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发布时间：2022-08-30 - 摘要：In recent years, porphyrin compounds have been widely used in photodynamic therapy (PDT) due to their unique photoelectrochemical properties.However, most porphyrin-based compounds have poor water solubility and are prone to uneven distribution of low-molecular aggregation, which limits their application in PDT. Therefore, this article takes advantage of the fact that porphyrin compounds are easily modified, and polymerizes —OH-containing porphyrin with N-isopropylacrylamide monomer to form a temperature-sensitive polymer (THPP) by reversible addition cleavage chain transfer radical polymerization-PAM4). The temperature sensitivity of the copolymer was studied. The study showed that the copolymer had an LCST value of 32℃. The MTT test results showed that THPP-PAM4 has good biocompatibility and low dark toxicity to L929 cells and HeLa cells. The phototoxicity to HeLa cells was significantly higher than that to L929 cells.关键词：Porphyrin;Reversible addition cleavage chain transfer radical polymerization;Temperature responsiveness;Minimum critical solution temperature;Biocompatibility
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发布时间：2022-08-30 - 摘要：The course of polymer rheology is very important for designs of polymer processing parameters,equipments and molds. It is a critical basic course for polymer discipline. In this paper the development and the course of polymer rheology in Qingdao University of Science and Technology were briefly introduced. Some teaching skills and experiences in lectures for students of engineering discipline were discussed. It is pointed out that, for undergraduate students, the basic concepts and basic principles, which are crucial, should be emphasized. It is also important to combine theory and practice in teaching process. The concepts and principles of Rheology could be easier to comprehended when exhibiting them in the design of rheological measurement instruments and typical processing of polymers.关键词：Rheology;Polymer;Teaching method
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发布时间：2022-08-30 - 摘要：Based on the characteristics and teaching experience of "Polymer Chemistry" course, we design the teaching contents and teaching methods. The classifications of the polymerization methods as the main line, the multidisciplinary blend teaching mode integrate into the polymer chemistry course teaching, combined with the plate item teaching method, case teaching method, verification method, and through the construction of the experimental platform, link theory with practice, strengthen the students learning effect. In addition, the typical experimental design has been verified by experiments, and the paper has been written. Combined with the author's own teaching experience, analysis and clarify the teaching mode in the optimization of the teacher’s teaching effect and improve the role of students’ comprehensive quality and the application in other courses.关键词：Polymer Chemistry;Multidisciplinary blend teaching mode;Teaching reform
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发布时间：2022-08-30 - 摘要：Polymer Polymerization Technology is a compulsory course for undergraduate majors of polymer. It plays a very important role in cultivating students' interest and ability to solve practical industrial production problems by using theoretical knowledge, and in innovative and entrepreneurial development by using the knowledge they have learned. Due to the rapid development of polymer materials and polymer polymerization technology currently, according to the curriculum characteristics of polymer polymerization technology and the experience of classroom teaching, the author has discussed how to improve students' interest, teaching quality and engineering practice ability. Different methods and reforms are put forward in terms of teaching contents and methods.关键词：Polymer Polymerization Technology;Teaching reform;Classroom teaching;Method
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发布时间：2022-08-30 - 摘要：Based on the development of science and technology and the requirements of the times, educational reform is imperative, and the integration of science and education is the new trend of development. "Polymer material comprehensive experiment" is a required course for polymer material and engineering major, which plays an important role in the smooth transition of students from school to work. The integration of science and education is particularly important in the teaching of this course, which can effectively improve students' comprehensive ability and scientific literacy. Taking the preparation and application of peanut shell adsorbent as an example, this paper introduces the teaching methods, implementation steps and teaching results of science and education integration. It involves theoretical knowledge, practical operation, data processing, use of modern instruments, spectrum analysis, thesis writing and other disciplines, and realizes the cross integration of cross-border knowledge system. The integration of science and education can not only improve students' interest, initiative, comprehensive ability, innovation ability, analysis and problem-solving ability, but also improve students' sense of professional identity, achievement and social responsibility, establish correct environmental protection awareness, become the backbone of promoting the construction of ecological civilization, and help to cultivate new engineering compound innovative talents with good scientific literacy.关键词：Polymer materials;Comprehensive experiment;Integration of science and education;Case teaching;Comprehensive ability
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发布时间：2022-08-30 - 摘要：Chemical reaction rate and chemical reaction progress are very similar concepts and knowledge, and closely related to each other at the same time. They describe the extent of change at a macro level or superficial level, but both have completely different nature, one is dynamic quantity, the other is thermodynamic quantity; one is microscopic property and the other is macroscopic property. By analyzing the free radical polymerization of methyl methacrylate (MMA), the connotation and significance of reaction rate and reaction progress were discussed, and the dialectically essential relationship between them was revealed too. Therefore, the work will make students further enhance theoretical knowledge on how to improve polymer yield, molecular weight, and promote the improvement of learning ability, moreover, it will be of great significance to improve students' practical ability and innovative ability in future work.关键词：Reaction rate;Reaction progress;Methyl methacrylate free radical polymerization
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发布时间：2022-08-30
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