最新刊期
卷 31 ， 期 12 ， 2018
- 摘要：Excessive fluoride in drinking water causes serious harm to human body. Adsorption is a simple,cost-effective and economical separation technology among the methods of treating fluoride polluted wastewater. Developing low-cost adsorbents with high adsorption capacity and easy regeneration property is one of the significant research objects. Polymer-based adsorbent is one of the most investigated adsorbents, which has attracted considerable interest in recent years. Combined with the latest research,this paper reviewed the preparation and modification of conducting polymers, biopolymers and resin-based adsorbents, as well as their adsorption performance and mechanism of F-. Finally,the development aspect of polymer-based adsorbents was prospected.关键词：Polymer;Adsorbents;Modification;Defluoridation
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发布时间：2022-09-05 - 摘要：The development and application status of molecular imprinting technique (MIT) in optical photochemical sensors are summarized in this paper. The complementary advantages, deficiencies and research hotspots of molecular imprinting polymers (MIPs) with fluorescent probes, fluorescent test strips,photonic crystal (PC) gel sensors and surface plasmon resonance (SPR) sensors are mainly reviewed. The photochemical sensors of molecular imprinting can avoid using large instruments, meanwhile provide new ideas for more rapid, convenient and low-cost detection methods, which are expected to be new ways for rapid detection of trace substances with molecular imprinted templates in pesticide residues monitoring,medical analysis, food security, environmental monitoring and security check.关键词：Molecular imprinting technique;Rapid detection;Photochemical sensor;Photonic crystal;Surface plasmon
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发布时间：2022-09-05 - 摘要：Medical dressings are medical materials used to cover sores or other damage on the body surface. Due to its disposable nature,the amount of loss in the medical process is large. Moreover, the traditional medical dressing not only has poor physical properties, no additional antibacterial and antibacterial properties, and the disposal of the discarded dressings causes great pollution to the environment. The large clinical demand, the increasing shortage of raw material sources,and the higher requirements for people's use make the reform and innovation of traditional medical dressing pads urgent. This paper focuses on the preparation and performance of a new type of medical dressing with a series of excellent properties, such as a non-woven material as a dressing base fabric and a higher moisture absorption, gas permeability and antibacterial property.关键词：Non-woven material;New;Medical dressings
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发布时间：2022-09-05 - 摘要：Fluoropolymer exhibits its superior chemical corrosion resistance,temperature resistance,aging resistance, abrasion resistance as well as excellent surface performance, flame retardant properties and photoelectric properties. Therefore, there are huge potentials for applications in electronic and electrical industry, textile,aerospace, construction, medical science, transportation, filtering and other industries. This paper discusses the research progress of fluoropolymer fiber home and abroad, introduces the synthesis, structure and properties of fluoropolymer and respectively analyses the preparation, structure and properties, application of the polytetrafluoroethylene (PTFE) fiber, polyvinylidene fluoride (PVDF) fiber, fluorinated ethylene propylene ( FEP ) fiber, perfluoralkoxy polymer ( PFA) fiber, ethylene tetrafluoroethylene copolymer (ETFE) fiber, ethylene chlorotrifluoroethylene copolymer (ECTFE) fiber.关键词：Fluoropolymer;Fiber;Preparation method;Structure and properties;Application
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发布时间：2022-09-05 - 摘要：Aliphatic polyester is a new biomedical material, the synthesis of which must avoid using the toxic catalysts or initiators and the organic solvents. Ring-opening polymerization is a method of high efficiency and mild condition. The mechanism of ring-opening polymerization combined with green preparation technology is a hot issue on the research of aliphatic polyester medical materials. The method of ring-opening polymerization of aliphatic polyester and the role of catalysts and initiators used in the polymerization were introduced. The development of replacing organometallic initiators with non-metallic and lipase was summarized. The green synthesis technology used the supercritical fluid as solvent and the advantages of supercritical fluid technology were introduced. Finally, the development and application prospect of aliphatic polyester were briefly forecasted.关键词：Aliphatic polyester;Ring opening polymerization;Enzymatic;Supercritical fluid
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发布时间：2022-09-05 - 摘要：Cellulose, the most abundant natural renewable resources on the earth, has the advantage of being cheaper, non-toxic,non-polluted and good biodegradable. Dissolve-regenerated cellulose membranes have received great attention in the field of chemical separation due to its high hydrophilicity, high thermal stability,high permeability and high pollution resistance. This paper introduces the novel dissolving system and the newest research of regenerated cellulose membranes on separation of organic or ion in aqueous phase and gas separation. Finally,a prospect on the future trends of regenerated membranes is proposed.关键词：Dissolution;Regenerated cellulose membrane;Separation
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发布时间：2022-09-05 - 摘要：HY-SBA-15 zeolite was prepared by in-situ synthesis method and was modified in La by impregnation method. La-HY-SBA-15 was characterized by XRD,N2 adsorption-desorption and so on. The alkylation influence of load amount, calcination temperature, calcination time on La-HY-SBA-15 zeolite was investigated in a fixed-bed reactor. When load amount of La was 10%,calcination temperature was 550℃,calcination time was 4. 5h,the reaction of alkylation had the best performance. La-HY-SBA-15 zeolite had micro-mesoporous structures by characterization of XRD and N2 adsorption-desorption,mainly had medium strong acid by characterization of NH3-TPD,had more Lewis acid than Bronsted acid by characterization of Py-FTIR.关键词：La-HY-SBA-15;o-Cresol;Alkylation;Micro-mesoporous
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发布时间：2022-09-05 - 摘要：A dispersant with good dispersion property of ultra-fine ground calcium carbonate (FGCC) pigment was prepared by using 2-(2-Biphenylyloxy) ethyl acrylate (OPPEA),Sodium p-styrene sulfonate (SSS) and Acrylic acid (AA) as polymerized monomers with solution polymerization. The effect of reaction conditions on the settlement volume of FGCCpigment dispersion was discussed with the orthogonal experiment. The effect of reaction conditions on the apparent viscosity and Zeta potential of FGCCpigment dispersion were also investigated by the single factor analysis. The results showed that the optimum reaction conditions are the molar ratio of SSS to OPPEA 1 to 1,the dosage of initiator 2. 5%,the reaction temperature 80℃. The effect of SAPD content on the apparent viscosity of FGCCpigment dispersion was discussed. With the increment of the shear rate,the dispersions possess the shear-thin behavior. When the SAPD content was 8%,the apparent viscosity could be low to 229. 1mPa• s. The particle size distribution is narrow, and the particle size is 445. 7nm.关键词：Polymeric dispersant;Ultra-fine ground calcium carbonate;Viscosity;Zeta potential
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发布时间：2022-09-05 - 摘要：Four-element model (Burgers-Frenkel model) is a convenient engineering model of viscoelastic behavior because of its relative simplicity and its fundamentally correct representation of the real behavior. However, it has only been used to describe viscoelastic behavior in creep. In this paper, the governing differential equation of the four-element model was solved by using elementary calculus. Consequently, mathematical modeling in creep, stress relaxation and dynamic mechanical behavior is performed. The four-element model widely used to describe creep can now be used to predict the stress relaxation and dynamic mechanical behavior of a viscoelastic material.关键词：Viscoelasticity;Creep;Stress relaxation;Dynamic mechanical behavior;Four-element model
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发布时间：2022-09-05 - 摘要：As a pilot and demonstration major in Liaoning Province,the Polymer Materials and Engineering major of Liaoning Shihua University has carried out a series of adjustments and reforms in four aspects: curriculum system, teachers' ability, practical application and scientific and technological competition. The applied undergraduate education of Polymer materials and engineering was created with the characteristics of petroleum and chemical engineering, three systems of professional courses,young teachers, modular design of practical application and long-term of technology competition. This education concept combines market demand, the characteristics of our university, and the overall growth of students. It will promote the sound development and successful transformation of the macromolecular specialty of our university, and enable our undergraduate students to become outstanding engineers who can engage in first-line production.关键词：Polymer materials and engineering;Applied transformation;Undergraduate education
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发布时间：2022-09-05 - 摘要："Synthetic technology of polymers" is an important specialized course in the field of polymer materials and engineering and related majors. It is also a applicable and practical course with a large amount of knowledge and information. According to the various contents and limited hours of the course, this paper discussed the curriculum teaching reform research and optimization of " Synthetic technology of polymers" from the aspects of teaching content, teaching points, teaching means, teaching methods, teaching practice and assessment methods. The reform is mainly reflected in the update, keep the teaching content with the times and the progress along with current knowledge on research; using advanced teaching methods to optimize classroom teaching system, the teaching focus. The reform is embodied in carrying out the combination of production process and production practice as well as theoretical teaching and practical teaching; encouraging teachers ' teaching and students’ teaching combined with each other. The goal is to enhance the students' interest and effect in learning " Synthetic technology of polymers" from various aspects as well as to improve the comprehensive quality of students. The students achieve unified knowledge and skills and abilities,lay a good foundation for social demand and job in the future.关键词：Synthetic technology of polymers;Teaching effect;Teaching research;Teaching reform
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发布时间：2022-09-05 - 摘要：Polymer Chemistry is one of the most important specialized course for the student majoring in polymer materials,its contents include basic theory and experimental teaching, which have direct impact on the follow-up study of other specialized courses. It is of great significance for teachers to actively explore the teaching reform of Polymer Chemistry to improve the teaching quality and effect. In this paper, the teaching methods reform was discussed in several aspects,such as the course construction goal,teaching method, experiment and practice teaching, examination ways through the combination of polymer chemistry teaching of exploration and thinking in recent years. Through the application of these teaching practice to arouse the enthusiasm of students,the teaching effect and students' comprehensive quality improved effectively.关键词：Polymer chemistry;Teaching methods;Teaching ideas
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发布时间：2022-09-05
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