最新刊期
卷 25 ， 期 9 ， 2012
- 摘要：Due to the unique amplified effect as molecular wires, conjugated polymers have advantage over small molecules in building up sensory systems with high sensitivity. This article presents several basic issues need to be considered in the design of fluorescent chemosensors, such as, the molecular recognition, the sensing mechanism and the read-out. Afterwards, the molecular assembly concept based on the combination of different functional modules was advanced for the synthesis of conjugated polymers with tuned properties to meet diverse sensing applications. Different poly(arylene ethylene)s (PAE) were used as examples to illustrate this concept. The sensing mechanisms as well as the applications of sensory systems were also discussed.关键词：Conjugated polymer;Fluorescence;Chemosensors;Sensing mechanism;Molecular assembly
- 3
- |
- 10
- |
- 0
发布时间：2022-09-18 - 摘要：The advances of the external electron donor technology in Ziegler-Natta catalyst system for propylene polymerization, including the types, the effects on the active center and the action mechanism, were reviewed. This paper especially emphasized the influences of structure effect and electron effect of donors on polypropylene catalyst system, and pointed out the typical structure characteristic of excellent external electron donors, which are silane compounds with both hydrocarbon substituent of big steric hindrance and alkoxy substituent of small steric hindrance. Besides, the role of external electron donor in propylene copolymerization and mulriple external electron donor technology, and the development trend of the external electron donor technology were introduced.关键词：Polypropylene;Ziegler-Natta catalyst system;External electron donor;Coordination polymerization;Alkoxysilane
- 2
- |
- 10
- |
- 5
发布时间：2022-09-18 - 摘要：The ability of block copolymer self-assemble into well-ordered structures on nanometer scale has captured much attention of scientists and technologists over the past decades from both experimental and theoretical owing to the potential applications of the structures in data storage, electronics, combinatorial chemistry, masks, and membranes, etc. The applied ordered nanostructures of block copolymer thin film is the perpendicular ones. However, it is a challenge to manipulate the process of the self-assembly of block copolymer thin film to obtain perpendicular ordered nanostructures and enable a broad range of applications. Here, some well-studied approaches in orienting the microdomains normal to the substrates in block copolymer thin films have been reviewed and the orientation mechanisms of some typical block copolymer thin films have been analyzed. Based on the approaches, an outlook of the controlling of the microdomains orientation has been prospected.关键词：Block copolymer;Thin film;Microdomain;External fields;Vertical orientation
- 2
- |
- 9
- |
- 0
发布时间：2022-09-18 - 摘要：Ionic liquids, regarded as novel "green" solvents, have many applications in various fields, such as biology, environment and chemical industry, due to their low evaporation, good solubility and other unique physicochemical properties. However, the research work on the potential toxicity of ionic liquids is insufficient, which is not favorable for the applications. This paper summarizes the recent research progresses on the toxicity of ionic liquids. Testing methods and parameters of toxicity of ionic liquids are introduced. The toxicity and biodegradability of ionic liquids are analyzed. Parameters influencing the toxicity of ionic liquids are discussed in details. Finally, the progress forecast of ionic liquids is described in this paper.关键词：Ionic liquids;Toxicity;Testing methods;Parameters;Influencing factors
- 2
- |
- 12
- |
- 3
发布时间：2022-09-18 - 摘要：Poly(ethylene oxide) (PEO) is a kind of multifunctional water-soluble polymer which was prepared by ring opening polymerization of ethylene oxide. PEO can be widely used for its excellent properties. The typical characteristics and research progress of PEO were introduced briefly in this article. Various catalyst systems of PEO were reviewed. The catalytic mechanism of the polymerization of EO was described here. Alkaline earth metal ammoniate system, alkyl metal catalyst system and alkoxy metal catalyst system which have potential industrial application were presented emphatically. The prospect of technology and application of PEO was also discussed.关键词：PEO;Poly(ethylene oxide);Water-soluble polymer;Synthesis;Catalyst system
- 4
- |
- 10
- |
- 1
发布时间：2022-09-18 - 摘要：PEEK as a special engineering plastic has been widely used in many engineering fields. To improve the thermal properties and mechanical properties and tribological performance and processing properties of the composites by various means benefit reducing its cost and farther expanding its applications. Recent research achievements of PEEK, chemical modification and physical modification including fibre reinforcing, inorganic fillers, surface modification, blending, have been reviewed in this article. The wide applications in the field of industry, electronics, aviation, automobile and medicine, were summarized briefly. In the end, the paper also provided a prospect for the questions and solutions in the terms of PEEK modification.关键词：PEEK;Chemical modification;Physical modification;Applications
- 5
- |
- 11
- |
- 7
发布时间：2022-09-18 - 摘要：Waterborne polyurethane-acrylate compounded emulsion(PUA) was synthesized with dimethylol propionic acid(DMPA), methyl methacrylate(MMA),butyl acrylate(BA),polyethylene glycol(PEG) as basic raw materials, together with triethylamine(TEA) as neutralizer by way of emulsion polymerization in situ. Such factors as: NCO/OH ratio, the amounts of dimethylol propionic acid(DMPA), kinds and amount of initiator, kinds and amount of emulsifier, NCO/OH ratio, solid content, which affected the properties and appearance of the PUA emulsions were discussed in detail. The hybrid emulsion was characterized by FT-TR,Malvern particle size analyzer andgel permeation chromatography(GPC),etc.关键词：Waterborne polyurethane;Acrylic ester;Emulsion polymerization in situ
- 2
- |
- 10
- |
- 0
发布时间：2022-09-18 - 摘要：Rosin glycerin ester(RO-GL) was used to modify polyurethane to improve the performance of polyurethane resin(PU). Modified polyurethane resin(RO-GL PU) was prepared by isocyanate and RO-GL which prepared by rosin and glycerol. The properties and structure were invesigated by FI-IR, TG and contact angle measurement. And the fineness, viscosity and adhesion on the plastic film of the ink prepared from modified polyurethane resin were studied. The experimental results showed that RO-GL could greatly enhance the thermal stability of PU and the wettablity and dispersion copper phthalocyanine(CuPc) in PU. The thermal degradation temperature of PU at mass loss 5% was increased from 305.2℃ to 329.8℃.The minimum RO-GL PU contact angle was only 37.8°, the ink fineness was10μm. And the ink had good fluidity, storage stability and adhesion.关键词：Rosin glycerin ester;Polyurethane;Synthesis;Properties
- 2
- |
- 10
- |
- 2
发布时间：2022-09-18 - 摘要：Dendritic-linear polyether block polystyrene was synthesized via atom transfer radical polymerization(ATRP)that the dendritic polyether having the core of —CH2Br, copper(I) bromide and 2,2'-biphenyl as the initiator, catalyst and ligand respectively. Element Analysis instrument was used to analysis the content of carbon and hydrogen belonged to the dendritic polyether initiators. IR Spectra and HNMR were chosen to characterize the structure of the dendritic-linear polymers. The results show that the component of the dendritic polyether form the first to the third generations are according with the perfect component; the dendritic-linear polymer initiated by the dendritic polyether have the clear structure, but the bromide at the end of polymer chains may be removed under the polymerized conditions.关键词：Atom transfer radical polymerization;Block;Polyether;Polystyrene;Dendritic-linear
- 2
- |
- 9
- |
- 0
发布时间：2022-09-18 - 摘要：This paper mainly reviews the status of some common anti-radiation materials-X, γ and neutron, where introducing emphatically the research progress of the rare-earth high polymer protective materials. Several design methods of radiation-proof materials such as the application and research of nanotechnology and the design and preparation of anti-radiation materials are analyzed and introduced. Meanwhile, several hot spots of current radiation-proof materials are prominently pointed out: the application of nanotechnology and rare-earth materials; the design and preparation of anti-radiation materials having outstanding comprehensive shielding effectiveness such as lightweight, non-toxic, compactness,wide shielding scope, sustaining shielding properties et al.; the optimization of materials for physics performance to improve tensile strength, hardness, corrosion resistance and other physical properties; the application of optimized design method based on genetic algorithm, MCNP code, the design methods of gradient materials and so on; at last, the intersecting studies and application of the above content.关键词：Radiation protection;Shielding;Composite;Polymer;Rare earth
- 4
- |
- 10
- |
- 2
发布时间：2022-09-18 - 摘要：Graphene is well known for their excellent properties in mechanics, optics, electricity and thermology. So, more and more researchers are interested in it. The current paper introduces the structure and characteristics of graphene. The modification methods of graphene are also summarized. The research progress of polymer/graphene nanocomposites is emphasized in this paper, and three kinds of preparation methods of the polymer/graphene nanocomposites were introduced, namely in situ intercalative polymerization, solution intercalation, melt intercalation. Besides, the application prospect of polymer/graphene nanocomposites is outlooked, and the existing problems and the direction of the future research are also discussed.关键词：Graphene;Polymer;Nanocomposites;Application
- 4
- |
- 9
- |
- 2
发布时间：2022-09-18 - 摘要：According to the objectives and requirements of quality education and innovative ability,combined with the features of Polymer Chemistry course,the teaching contents and methods was designed in order to improve students' interest in learning,train the ability of parsing problem and problem-solving, stimulate the student's creative thinking. The teaching approach on culturing students' creative thought was explored from the aspects of combining the theory with actual, using teaching model to cultivate research thinking, visualization teaching in classe, paying attation to analyse problems and inducing, and paying attention to practical teaching etc..Based on our practices and experiences,it is considered that these teaching methods can greatly improve the student's ability to innovation.关键词：Polymer chemistry;Classroom teaching;Creative thinking;Teaching method;Learning interest
- 2
- |
- 10
- |
- 1
发布时间：2022-09-18 - 摘要：Polymer chemistry is an important technical basic course of material chemistry discipline. It is a subject based on experiment, so polymer chemistry experiment is an important component of polymer scientific research and polymer teaching. In this course, students learn all kinds of experimental techniques and methods after they have a grip of polymer chemistry knowledge and their basic capacity in scientific research and technological development are cultivated. From the view of the requirement of qualified personnel on polymer materials, in order to train creative applying talents, the new teaching system is established by giving lecture on experimental technique, improving basic experiment to comprehensive experiment or designing experiment, adding researching experiment. The new experiment contents contain material properties and engineering process. Practice proves that innovative ability and engineering practice ability of students are improved.关键词：Applying talents;Polymer chemistry experiment;Basic experiment;Experimental teaching
- 2
- |
- 10
- |
- 5
发布时间：2022-09-18
- 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