最新刊期
卷 30 ， 期 12 ， 2017
- 摘要：The diposing and recycling of waste rubber is the important and difficult point in the world rubber industry. Pyrolysis is environmentally-friendly and potential solid waste treatment method,attracting a large number of people's attention. The pyrolysis of scrap rubber can solve the environmental pollution efficiently caused by these dumped rubber, but also can recycle three useful products: pyrolytic carbon, pyrolytic oil and gas. The typical pyrolysis reactors and techniques of waste rubber are overviewed in this paper,including vacuum-moving bed reactor, fixed bed reactor, fluidized bed reactor, rotary kiln reactor, microwave assisted pyrolysis and catalytic pyrolysis. The effects of the main process conditions are systematically outlined. The composition, physicochemical properties and application of the resulting products are also detailed analysis. The key of waste rubber pyrolysis is to obtain high-quality products,while reducing the consumption of energy to the greatest extent. As a result, to develop an economic, energy-saving and to obtain higher value of pyrolytic products is the main direction of waste rubber pyrolysis technology.关键词：Waste rubber;Pyrolysis;Pyrolysis technology;Pyrolysis products
- 6
- |
- 12
- |
- 2
发布时间：2022-09-06 - 摘要：Due to the increasing consumption of non-renewable petroleum resources,the exploitation and utilization of biomass renewable resources has become a global research hotspot. Lignin has a wide range of sources. It belongs to renewable low-cost resources, and carbon content is higher than 60%. It has attracted much attention of carbon fiber research and development researchers. In recent years, many breakthroughs have been achieved in research and development. Starting from the generalization of the pretreatment of lignin spinning, the development progress,mechanic performance comparison and latest research progress were reviewed on the hotspots of the lignin based carbon fiber such as pure lignin based carbon fiber, blending and grafting of modified lignin carbon fiber, and the prospect of lignin carbon fiber research was also prospected.关键词：Lignin;Carbon fiber;Blending;Graft
- 7
- |
- 12
- |
- 2
发布时间：2022-09-06 - 摘要：Amphoteric proton exchange membrane is a kind of polymer membranes with proton-conducting function, which contains both acidic and basic structure. Strong structural design and special interaction of molecular chains make it excellent blocking performance of methanol or vanadium ion while conducting,has caused wide attention in recent years. In this paper, the relevant research results at home and abroad were reviewed, and the amphoteric proton exchange membrane was defined. According to chemical structure and preparation methods, it was divided into three types: (1) alkaline polymer and high boiling acid doping type, (2) acid and alkaline polymer blends,and (3) the intrinsic properties of polymers containing the acid-base structure, and their applications in proton exchange membrane fuel cells and vanadium redox flow batteries were discussed.关键词：Amphoteric proton exchange membrane;Proton exchange membrane fuel cell;Vanadium redox flow battery
- 5
- |
- 9
- |
- 0
发布时间：2022-09-06 - 摘要：3D printing, which is more commonly referred to as additive manufacturing (AM),has dramatically developed in recent years as an emerging fabrication technology. As one of the earliest rapid prototyping technology, photosensitive resins based 3D printing is particularly attractive with the advantages of high building resolution, fast building rate, low utilization cost and good adhesion between layers. With the rapid development of photosensitive resins based 3D printing technology, the requirements for photosensitive resins are more and more critical. We have summarized the latest progresses on the excellent properties and sophisticated structures of the 3D printed materials based on conductive objects, shape memory polymers, polymers with special wettability, biopolymers and hydrogels, aerogels. Also,the application and development tendency of photosensitive resin for 3D printing have been presented.关键词：Photo curable materials;High performance;Functionalization;3D printing
- 10
- |
- 14
- |
- 6
发布时间：2022-09-06 - 摘要：Polyamide 6(PA6)/ionic liquids composite membranes were prepared by electrospinning with formic acid as solvent. The viscosity and conductivity of the solution were characterized by using rotational viscometer and the conductivity meter, and the effect of different ionic liquids content on the morphology, thermal, mechanical property and electrical properties of PA6/ionic liquids composite membranes was investigated by using scanning electron microscope (SEM),differential scanning calorimetry (DSC) , fiber tensile tester and surface resistance testing. The results showed that the change of the solution viscosity was not obvious, while the conductivity of the solution increased rapidly with increasing the content of ionic liquids ; The diameters of PA6 fibers increased gradually with increasing the content of ionic liquids. Moreover, PA6 fibers had an alignment trend. When the amount of ionic liquids was 9% (wt),the cluster phenomenon appeared; The melting point, crystallinity and tensile strength of PA6/ionic liquids composite membranes all decreased with increasing the content of ionic liquids. However, the elongation at break increased with increasing the content of ionic liquids. The surface resistance of PA6/ionic liquids composite membranes was significantly reduced by adding ionic liquids.关键词：PA6;Ionic liquids;Electrospinning;Alignment
- 6
- |
- 9
- |
- 1
发布时间：2022-09-06 - 摘要：In our research, cellulose pulp dissolved in quaternary ammonium/DMSO solution which is a new kind of ionic liquids. The viscosity of quaternary ammonium/DMSO/cellulose solutions at different concentrations was measured using a rotational viscometer. The results showed that when the concentration of cellulose was high and the degree of polymerization was high, the viscosity of the solution was more sensitive to temperature. The rheological properties of the solutions were determined by rheometry. The results showed that the quaternary ammonium/DMSO/cellulose solution was a shear-thinning fluid at all concentrations. The structural viscosity, non-Newtonian index, and viscous flow activation energy of the solutions were also discussed. Through analysis using the Arrhenius equation, the viscous flow activation energy of the solutions was hardly influenced by the solution concentrations.关键词：Cellulose;Quaternary ammonium;Viscosity;Rheological properties
- 5
- |
- 9
- |
- 1
发布时间：2022-09-06 - 摘要：Three mathematical models for predicting the diameter of electrospun fibers were established respectively by Fridrikh,Spivak,Stepanyan from the electrospinning mechanism so far. The two main parameters of the ahead two models are the surface tension of solution and volume charge density of jet. The two main parameters of the Stepanyan model are zero shear viscosity of electrospun solution and volume charge density of jet. On the basis of the experimental reports of power exponents between the electrospun fiber diameter and the three parameters at present, The experimental results generally are not consistent with the model predictions. The main reasons of resulting in the disagreements are: (1) The mathematical models are based on Newtonian fluid, but non-newtonian fluids have already been the main electrospun objects; (2) Neither of the three parameters is not independent variables, etc. The respect research directions of electrospinning were put forward.关键词：Electrospinning;Tiber diameter;Power exponent;Zero shear viscosity;Surface tension;Volume charge density
- 5
- |
- 9
- |
- 0
发布时间：2022-09-06 - 摘要：Electrical Properties of Polymers contains many abstract basic concepts and much mathematical and physical knowledge,and thus it is not easy to master the core content for many undergraduate students. Some students don't know which parameters should be used to characterize the electrical properties of polymers and also don' t know which parameters should be used to select a polymer for a specific application. According to the experience of the authors,the teaching effect can be improved using four parameters (i. e.,dielectric constant,dielectric loss tangent, breakdown strength and electrical conductivity) as the core teaching content. In this article,the authors give their teaching experience on the contents which are difficult to teach and/or learn, and emphasis is given to the physical meaning and the origin of the dielectric loss. These may be referred by other teachers.关键词：Electrical properties of polymers;Dielectric constant;Dielectric loss tangent;Breakdown strength;Electrical conductivity
- 6
- |
- 9
- |
- 1
发布时间：2022-09-06 - 摘要：The educational practice on the combination of multi-experiments in polymer physics is described in this paper. In the teaching of experiments of polymer physics,the separate experiments were combined and connected each other. A hypothetical problem was presented and needed to be solved by the combination of several experiments. The students were required to share the experimental results by team-work. The evaluation of teaching effects indicated that, compared to the traditional teaching method, the combinatorial teaching were paid more enthusiasms by the students. The combination of multi-experiments was advantageous to understand well not only the isolated knowledge point,but also the relevance of different knowledge points. The students'scores in this course were graded comprehensively based on course preparation, personal experiment report,team-work report and semester examination. This new teaching method was successfully carried out and approved by most students.关键词：Experiments of polymer physics;Combinatorial teaching;Teaching reform
- 6
- |
- 11
- |
- 1
发布时间：2022-09-06 - 摘要：The course of "Novel processing technology for polymer materials"is a frontier technological course which is developed based on two undergraduate courses, i. e. "Polymer processing machinery" and "Principles of Polymer Processing". The characteristics of this course focus on new equipments, novel technologies, and fresh methods of polymer materials processing currently. So it could be acted as the major elective courses of undergraduate to widen their professional knowledge or also could be served as a professional backbone course of master degree students in materials processing engineering major. In our university, this course was set up for graduate students for more than ten years, and we took some reformation to improve the teaching effect, gaining some effective experience. In this paper, the teaching goal, teaching content, teaching method, and teaching result are introduced according to our teaching experience.关键词：Polymer materials;Novel processing technology;Teaching model;Reformation;Exploration
- 6
- |
- 12
- |
- 0
发布时间：2022-09-06 - 摘要：In view of no understanding of polymer processing experiment purpose, principle, teaching content for students, and the lower participation in the experiment. On the basis of old teaching methods, the teaching reform was carried out. In which includes the network platform construction, online teaching mode,resources sharing and examination mode reform. The teaching reform of polymer processing experiment can make the isolated experiment teaching content turn into system and complete experiment in the teaching content of polymer processing experiment. Announced on the online learning tasks, lets the student in advance preview experiment content,the students can learn the more content of polymer processing experiment in short time and any learning tasks. The construction revolution of the polymer processing online platform, can greatly ease burden on the teachers,make students learn more efficient, the classification of the course information is more clear and concise,and the course resources sharing and experimental evaluation are more detailed answer. Use of online and classroom teaching in two ways,also make the students operation be more skill for the polymer processing experiment, and have further knowledge for experimental principle. So the students in the accumulation of theoretical knowledge and practical ability and innovative thinking,etc have been improved.关键词：Polymer processing experiment;Course platform;Network construction;Teaching reform
- 5
- |
- 9
- |
- 0
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