最新刊期
卷 31 ， 期 7 ， 2018
- 摘要：In this presentation the 60 year' s history and current situation of the teaching of polymer physics in the University of Science and Technology of China have been introduced. In particular, a series of textbooks on polymer physics have been written and published, and teaching research has been carried out in depth.关键词：Polymer physics;Teaching;University of Science and Technology of China(USTC)
- 11
- |
- 12
- |
- 3
发布时间：2022-09-06 - 摘要：Cellulose, the most abundant natural macromolecular material on earth, shows nontoxic,regenerative, inexpensive, unique structural structures from macro-to molecular scales. The hydrogen bonding endows cellulose porous network structure at nanometer levels. Due to the specific molecular arrangement and multilevel spatial structure, cellulose is widely used as a biological template for controllable preparation of nanomaterials. In this paper, we reviewed the preparation of various functional nanomaterials by using cellulose as template, including oxidate nanomaterials, metal nanomaterials, inorganic compound nanomaterials and other inorganic nanomaterials. We also looked forward to the future research direction of cellulose template controllable functional nanomaterials.关键词：Cellulose template;Controlled preparation;Inorganic nanomaterial;Functional material
- 6
- |
- 11
- |
- 0
发布时间：2022-09-06 - 摘要：Polyaniline has a wide application in the field of corrosion protection, the special structure of polyaniline contribute to its poor solubility in water system, that the application of corrosion inhibitor is restricted. In this paper, we reviewed the strategy in order to improving the water solubility of polyaniline and that was be used as corrosion inhibitor. The anticorrosion mechanism of PANi was introduced and the application and preparation of binary polyaniline composite with chitosan and cellulose was reviewed.关键词：Polyaniline;Inhibitor;Watersoluble;Chitosan;Cellulose
- 7
- |
- 9
- |
- 1
发布时间：2022-09-06 - 摘要：In this article, different methods to modify mechanical properties and heat resistance of polystyrene (PS) have systematically been reviewed. These include filling the PS directly or in situ during its polymerization with inorganic fillers, unfunctionalized or functionalized, blending the PS directly or in situ during its polymerization with polymers, unmodified or modified, cross-linkings (ionic cross-linking, interpenetrating polymer network, covalent cross-linking, etc. ), random, graft or block copolymerization starting from monomers, two method coupled modifications (e. g., blending-filling, copolymerization-blending,copolymerization-filling, ionic crosslinking-blending,and ionic crosslinking- filling),etc. Based on the above,the advantages and disadvantages have been compared and discussed of various modification methods.关键词：Polystyrene;Mechanical property;Heat resistance;Modification;Advance
- 10
- |
- 13
- |
- 1
发布时间：2022-09-06 - 摘要：Dopamine could be oxidative self-polymerized under the weak alkaline condition, and formed surface-adherent polydopamine coatings onto a wide range of materials,including noble metals,metal oxides,inorganic and organic polymers and so on. Due to the special molecular structure of polydopamine coatings, secondary reactions could be used to create a variety of ad-layers and leaded to tailoring of the coatings for diverse functional uses. Besides, the functional materials surfaces also could be formed by one-pot strategy by the interaction of dopamine/polydopamine with the functional matter. In recent years, the two-step surface modification and one-step co-deposition surface modification methods based on polydopamine coatings were explored and applied in many areas. It is reported the latest research and application progress of polydopamine coating.关键词：Surface modification;Co-deposition;Polydopamine;Adhesiveness
- 12
- |
- 9
- |
- 8
发布时间：2022-09-06 - 摘要：Halogen-free flame retardants are introduced into PVA to replace the conventional halogen-contained flame retardant owning to the increasing environmental pressure. The current research progress and development trend of halogen-free flame retardant for Polyvinyl alcohol (PVA) were reviewed. The studies of various kinds of PVA flame retardants containing inorganic flame retardant, phosphorus/nitrogen contained flame retardant, intumescent flame retardant and reactive flame retardant were summarized and analyzed. The flame retarding mechanism, the advantages and disadvantages of different PVA flame retardant, and the influence of typical flame retardant on properties of PVA were introduced. On this basis, the uniqueness of PVA flame retardant was discussed. The trend of PVA flame retardant research is to develop a compound formula suitable for PVA processing considering the structural features of PVA.关键词：Polyvinyl alcohol;Flame retardant;Blending modification;Reacting flame retardant
- 10
- |
- 22
- |
- 1
发布时间：2022-09-06 - 摘要：Mesoporous material KIT-6 has attracted more and more attention due to its textural advantages such as its moderate pore size, large specific surface area, highly ordered three-dimentional channel structure and so on. Firstly, we introduced some common preparation methods of KIT-6 and its forming mechanisms. KIT-6's performance in its traditional applications such as catalysis and sorption were presented, among which KIT-6 showed great advantages of low pollution, low energy consumption, high performance and so on. Its practical value such as medicinal function was also analyzed, which proved that KIT-6 was a sort of ideal material with practical applicability. It indicated that KIT-6 was in favor of the circulation of guest molecules in the pores so that it could develop the mass transfer performance better. We believe that KIT-6 will have an even broader application prospect in the future.关键词：KIT-6;Hydrothermal synthesis;Catalysis;Sorption;Medicine
- 7
- |
- 9
- |
- 1
发布时间：2022-09-06 - 摘要：Hyperbranched polyethylenimine-graft-poly (ethylene glycol) copolymers (HPEI-g-PEGs) were prepared through two steps. Fluorescence characterizations demonstrated that increasing the excitation wavelength (λex ) led to the gradual red-shift of the maximum emission wavelength (λem). Moreover,the emission intensity initially increased with the λex increase, and reached the maximum at 360 nm. Further increasing λex resulted in the gradual decrease of emission intensity. With λex = 360 and 470nm,HPEI-g-PEG could emit blue light with the maximum λem = 455nm and green light with the maximum λem = 535nm,respectively. The emission intensity of blue light was obviously stronger than that of green light. Raising the degree of substitution of PEG, increasing the polymer concentration and prolonging the oxidation time all favored to the elevation of the emission intensity ratio of green to blue light. Whereas altering the pH of solution had no marked influence on the emission intensity ratio of green to blue light. Compared with the blue emission, the green emission of HPEI-g-PEG was more selective toward metal ions.关键词：Hyperbranched copolymer;Fluorescence;Hyperbranched polyethylenimine;Poly(ethylene glycol)
- 6
- |
- 9
- |
- 0
发布时间：2022-09-06 - 摘要：Centrifugation is an important method for producing the concentrated natural rubber latex (NRL) in the current industrial production. The aims of this project are to investigate the change of the components and structure of natural rubber latex in the preparation process of centrifugal concentrated latex production, including the rubber hydrocarbon, protein, lipid, acetone extract (AE), water extract, ash of NRL by bromination, Kjeldahl determination, extraction, etc; and particle morphology, size,molecular weight (Mw) and crosslinking network of NR by high resolution transmission electron microscope (HRTEM), Melvin granulometer,gel permeation chromatography (GPC) and nuclear magnetic resonance crosslink density meter. The result of research shown that all of the components and structure didn't change significantly in the process of clarifying and adjusting. While, with the contents of rubber hydrocarbon, lipid and AE, the contents of protein, water extract and ash decreased in the the centrifugating process. Furthermore, M_w and crosslink density both increased. According to the obtained results, the centrifugating is the key process for the components and structure of natural rubber latex in the preparation process of centrifugal concentrated latex production. And the particle morphology, size, Mw and crosslink structure were influenced by the changes of protein and lipid.关键词：Centrif ugation;Natural rubber latex;Components;Structure
- 8
- |
- 10
- |
- 1
发布时间：2022-09-06 - 摘要：To improve the wear and low-temperature resistance of FKM,CF/MVQ/FKM composites were prepared, in which FKM/MVQ blends were used as matrix, and the coupling agent treated-CF was used as the reinforcement. The effect of coupling agent type and content on mechanical properties of CF/MVQ/FKM composites was investigated, the interaction of coupling agent and composites was studied by infrared spectrum (IR) and X-ray photo electron spectroscopy (XPS),the surface morphology and phase composition of composites were observed by atomic force microscope (AFM) and infrared chemical imaging technology, the thermal properties of composites were researched by dynamic thermal mechanical analysis (DMA) and thermogravimetric analysis (TG). The results show that coupling agents crosslink with CF and MVQ/FKM blend, the best coupling agent is KH590,and content is 2 phr (part per hundred rubber), the wear of KH590/CF/MVQ/FKM composites decreases from 0. 0314cm3•km-1 to 0. 0283cm3 •km-1, Tg decreases from —20 ℃ to —30℃, initial decomposition temperature increases from 231℃ to 304℃ compared with FKM.关键词：Fluorine rubber;Silicone Rubber;Carbon fiber;Wear resistance;Thermal property
- 4
- |
- 15
- |
- 0
发布时间：2022-09-06 - 摘要：Spinning solutions with different addition ratios were prepared by blending carbon black aqueous suspension with cellulose solution. The viscose/carbon black composite cellulose fibers were prepared by wet spinning. The structure and properties of the prepared fibers were analyzed by scanning electron microscopy (SEM), X-ray diffraction (WAXD) and intensity analyzer. WAXD analysis results showed that the composite fibers with different proportion of carbon black still have the cellulose II crystal structure, the degree of crystallinity decreases with the addition of carbon black; The results of SEM showed that the appropriate proportion of carbon black in the composite fiber was distributed uniformly in the matrix of the viscose, and there was no obvious agglomeration. The results of fiber mechanical properties analysis showed that the mechanical properties of the composite cellulose fibers increased with the addition of the appropriate amount of carbon black, while the mechanical properties of the composite cellulose fibers increased when the excess amount of carbon black was added.关键词：Carbon black;Cellulose fiber;Structure and property;Wet spinning
- 8
- |
- 11
- |
- 0
发布时间：2022-09-06 - 摘要：Polyvinglidene fluoride(PVDF) is a kind of polymer with pyroelectric and piezoelectric properties. It is an ideal candidate material in the electrical and electronic field because of its better flexibility, thermal stability and corrosion resistance and so on. However, compared with traditional inorganic piezoelectric materials, its dielectric constant and piezoelectric constant of PVDF are much lower, so now how to improve the dielectric and piezoelectric properties of PVDF has become one international research hot spot. The recent advance on the methods of improving the dielectric or piezoelectric properties of polyvinylidene fluoride (PVDF) by hybridization of metal particles and metal compounds is reviewed in the paper. Advantages and disadvantages of this method are discussed, and the future research trend of hybrid PVDF for improving the electric properties are prospected meanwhile.关键词：PVDF;Dielectric properties;Piezoelectric properties;Metal particle;Metal compound
- 7
- |
- 10
- |
- 2
发布时间：2022-09-06 - 摘要：In recent years, polymer conjugated drugs have attracted much attention due to their good stability, excellent sustained release and specific drug targeting. Generally, they can be prepared by two methods: first monomer polymerization then drug conjugating, and first making drug conjugated into monomers then polymerization. Based on this classification,the recent research progress of polymer conjugated drugs is reviewed. The biodegradable polymers as the carrier of polymer conjugated drugs have good biodegradability in vivo and can avoid a second major surgical procedure. The post-polymerization method of drug conjugated monomers is convenient for its simple procedure with high drug-loading. These advantages make them be two important developing directions in the research area of polymer conjugated drugs. Especially, assembling carrier preparation and drug loading into one-step process to prepare biodegradable polymer conjugated drugs is very noteworthy.关键词：Polymer conjugated drugs;Carrier preparation;Chemical bonding groups;Biodegradable polymers
- 6
- |
- 10
- |
- 1
发布时间：2022-09-06 - 摘要：As one of the most widely studied conductive polymer, Polyaniline (PANI) has high conductivity and good redox property. But its conjugated delocalization structure make it difficult to dissolve in the organic solvent and the conductivity will become poor under neutral and alkaline environment, which restrict its application. Carbon nanotubes (CNTs) have been frequently applied with excellent electrical, thermal properties, optical properties and unique mechanical properties. The combination of CNTs and PANI will overcome the defects of PANI itself by utilizing the synergistic effect of the two, which effectively improves its capacity and cyclical stability. The preparation processes of polyaniline/carbon nanotube composites using chemical oxidation polymerization, electrochemical polymerization and etc were summarized. Applications of the composites in supercapacitor,electrochemical analysis, batteries,sensors and etc were introduced particularly. The future applications and development in PANI composites were outlooked according to the properties of PANI and CNTs.关键词：Polyaniline;Carbon nanotube;Research progress
- 7
- |
- 9
- |
- 0
发布时间：2022-09-06 - 摘要：Case-based teaching is an effective method to enhance postgraduate students' ability in practices. The Polymer Interfaces and Blends involves polymer synthesis, microstructure, adhesion, blending, processing, composite and etc.,and is appropriate for case-based teaching for postgraduate students. Case is the first element of case teaching. Case-based teaching should be around the curriculum content, select the cases from production or research practice,and pay attention to the latest technology. Eight true cases from production or research practice,corresponding to the eight topics related to the curriculum content,were selected to be analyzed in the author's class. The teaching course included 5 parts: question, theory, discussion, comment and summary. The teaching strategies should be meticulously designed in order to promote the students to understand the theories more deeply and acquire the capacity for practice. The strategies should also aim to help students broaden their professional horizons and develop their creative ability.关键词：Case-based teaching;Polymer Interface;Postgraduate
- 9
- |
- 13
- |
- 0
发布时间：2022-09-06 - 摘要："Polymer synthesis technique" which uses the synthesis of typical polymer products as the project carrier implements the integration of theory and practice of project. Through the reform, two characteristics are refined: the project design concept— "eating out the method, eating out the flavor and tasting the culture"; the features of the project implementation- "emotion implantation, four movement one fix and skill coming from practice". Under the premise of relaxed relationship between the teacher and students and full recognition of the teaching atmosphere, the students are able to be familiar with "four movement",use one fix to realize the actual effect of curriculum reform "doing to learn, learning to do and integration of doing and learning",and to make the curriculum reform down to the earth and sound to the ground.关键词：Emotion implantation;Four movement one fix;Skill coming from practice;Actual effect
- 6
- |
- 10
- |
- 0
发布时间：2022-09-06 - 摘要："Polymer material processing" as a compulsory course of polymer materials discipline,aims to train higher quality engineers capable to undertake research,development and production management work for polymer materials. This course with its own unique theoretical system and technical methods is rich in content and strong practicability. The progress of modern science, technology and industry opens up a broader prospect for the development of polymer materials disciplines, likewise puts forward higher requirements for the instruction of "polymer materials processing". Subsequently, the traditional instruction resources and methods are urgently needed to be reformed and improved. And methods which is based on the optimization of teaching content, the development of teaching mode, the integration of disciplines and courses are proposed to innovative exploration on the instructing of " polymer materials processing " course. To lay a good theoretical and practical basis for the students in the future work on polymer materials through in-depth optimization of teaching programs, improving the quality of teaching and personnel training.关键词：Polymer materials;Molding processing;Instruction
- 8
- |
- 13
- |
- 1
发布时间：2022-09-06
- Technical support is provided by Beijing Founder electronics co., LTD 京ICP备09064830号-19
京公网安备11010802024621 - It is recommended to read the content of this site in Chrome&IE9+. Please switch to extreme mode in browser 360.
- Cookies We use cookies to help provide and enhance our service and tailor content. By continuing, you agree to the use of cookies.
0