最新刊期
卷 28 ， 期 6 ， 2015
- 摘要：Gold nanorods (AuNRs) based intelligent composite nanogels are the intelligent nanomaterials which combine the unique properties of both AuNRs and intelligent nanogels. Their prominent characteristic is that a variety of properties of the loaded AuNRs within the nanogels can be tuned by external stimulus, or external stimulus can be sensed by determining the change of their properties. The characteristics and synthesis methods of AuNRs based intelligent composite nanogels of three kinds of morphological structure including core-shell structure type, randomly filling type, strawberry structure type are firstly reviewed in this paper. Then, the properties and applications of AuNRs based intelligent composite nanogels are summarized. Finally, their future research direction and development outlook are commented.关键词：Gold nanorods;Intelligent composite nanogels;Morphological structure;Property;Application
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发布时间：2022-09-18 - 摘要：Electrochromic materials as a kind of new functional materials of green environmental protection,energy saving and low carbon, can be widely used in multitudinous fields as display devices,smart windows,energy-efficient buildings, national defensive military camouflage etc, attract people's great attentions. This paper presents a review of the latest research progress of electrochromic materials based on polyaniline. It introduces in detail the synthesis and current research of aniline and substituted aniline homopolymer, aniline and substituted aniline copolymer, hybrid materials based on polyaniline derivatives and electrochromic materials with oligoaniline side chains. Especially from the molecular structure, dissolution and electrochromic properties,the authors point out the existing problems of the current electrochromic materials based on polyaniline, give the future directions for improvement.关键词：Polyaniline;Electrochromism;Hybrid materials;Oligomer
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发布时间：2022-09-18 - 摘要：Waste rubber modified asphalt can significantly prolong the service life of road. The research process in hot oxygen, ultraviolet and water aging behaviors of waste rubber modified asphalt in domestic and abroad were summarized in this paper. The aging characteristics of rubber modified asphalt were analyzed through characterizing the performance and microstructure changes. Under the action of heat and oxygen, ultraviolet radiation and water, the aging take place in the rubber modified asphalt, the softening point increase, the penetration decreases and the carbonyl content increases. Especially , the ultraviolet light and oxidation aging deeply affects the aging performance of the rubber modified asphalt after water aging, which was aggravated coupled with water. The water dissolves part of the aging products and promotes the aging of asphalt rubber. At present, there is little research and analytical method on the change of structure performance of rubber and the environmental coupling factors on the aging process of the rubber modified asphalt, which need more attention in future studies.关键词：Rubber modified asphalt;Ultraviolet aging;Thermal aging;Water aging
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发布时间：2022-09-18 - 摘要：Adsorption and separation materials made from raw material of cellulose can reduce the use of petroleum resources and has many advantages such as low cost, environmentally friendly and good biocompatibility. Cellulose contains large amounts of hydroxyl groups which can be modified by the reaction of crosslinking, grafting, introducing inorganic particles or combination with polymer to prepare adsorption and separation materials with the morphology of microsphere or film. These materials are widely used in biomedical,waste water treatment, gas separation and other fields. In this paper, the latest advances on research of cellulose and its composite materials in adsorption and separation fields of water, oil, heavy metal ions,gases and organics were reviewed by summarizing the relevant papers published during the past 5 years. Based on this,the research trend and the existing problems were discussed.关键词：Cellulose;Modification;Adsorption;Separation
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发布时间：2022-09-18 - 摘要：The effects of different synthesis methods, tartaric acid concentration, temperature, and time on the preparation of PANI nanofibers in tartaric acid system were studied in this paper. The products were characterized by the testing technique of scanning electron microscope ( SEM),Fourier transformed infrared spectroscopy ( FT-IR) and Ultraviolet and visible spectrum(UV-Vis). The solubility in NMP system and corrosion resistance of the PANI prepared with different methods were also investigated. The results showed that direct mixing reaction is a simple and efficient polymerization method for fabricating high quality PANI. The optimum preparation parameters of direct mixing method are as follows: tartaric acid 0. 1mol/L, 20℃,24h. The solubility of PANI with direct mixing reaction is 4. 7g/L,similar to the dripping slowly reaction, but higher than that of PANI prepared with interfacial polymerization. The inhibition efficiency of PANI prepared with direct mixing method is 87. 79 %,which is much better than that of PANI prepared with the dripping slowly reaction and interfacial polymerization.关键词：Polyaniline;Tartaric acid;Direct mixing reaction;Solubility;Corrosion resistance
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发布时间：2022-09-18 - 摘要：Uniform poly (AAm-DVB) microspheres with the average diameters varying from 2. 933µm to 4. 74µm were prepared in ethanol by precipitation polymerization with AIBN as the initiator. The parameters which influence both the product morphology and temperature-resistance were investigated by particle size analysis, scanning electron microscope and thermogravimetric analysis. The results show that only control the temperature at 70℃ , the addition of DVB in 25% 〜 50% and the addition of monomers below 4%, uniform microspheres could be obtained; increasing the DVB concentration in monomers, the temperature-resistance of microspheres is enhanced and which could be as high as 320℃. The average diameters of microspheres increase with the prolonging in polymerization time while decrease with the increasing in initiator concentration. However, both the prolonging in polymerization time and the increasing in initiator concentration are favorable to the increase of yield.关键词：Precipitation polymerization;Ethanol;Acrylamide;Microspheres;Temperature-resistance
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发布时间：2022-09-18 - 摘要：The objective of this study was to investigate the changes of component, surface morphology, functional groups, and crystallinity of corn stalk before and after depolymerization with NaOH. The results showed that H-lignin was mainly constitutional unit of lignin in corn stalk. The phenolic compounds in liquid of the depolymerized corn stalk were 4- hydroxybenzaldehyde, vanilline,lilac aldehyde,p-coumaric acid,and ferulic acid. After alkali depolymerization, the surface morphology of corn stalk became loose and porous,the characteristic absorption peak of lignin disappeared in infrared spectroscopy, about 85% of lignin and 52% of hemicellulose were removed and thereby resulted in the increase of relative content and crystallinity of cellulose. These results may be beneficial to further enzymolysis and/or other biochemical methods for high value transformation of straw fiber.关键词：Corn stalk;Alkali;Depolymerization;Lignin;Phenolic compound 10. 14028/j. cnki. 1003-3726. 2015. 06. 007
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发布时间：2022-09-18 - 摘要：In this paper, the interaction between Polyaniline nanorods (PANI) and Ag nanoparticle (or dendritic nanostructures) was investigated by Surface-enhanced Raman scattering ( SERS). It indicated that the molecular conformation of PANI nanorods could be changed via localized surface plasmon resonance of Ag substrate. The experimental results showed that the conjugative effect between N atoms of PANI molecule and free electrons of Ag could be induced by surface plasma resonance effect. As a result, the vibration frequency of C-H in-plane bending and C-C stretching vibration blue shifted to low wavenumber. Meanwhile, the groups onto the Ag metal surface which Raman scattering intensity increased in SERS was perpendicular to the long axis of PANI molecular, and the groups onto the Ag metal surface was parallel to the long axis of the molecules revealed by decreasing Raman scattering intensity in SERS.关键词：Polyaniline (PANI);Surface-enhanced Raman scattering (SERS);Silver substrate;Conformation
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发布时间：2022-09-18 - 摘要：Natural rubber latex was firstly treated with alkaline protease or phospholipase. Then the effect of protein and phospholipid on natural rubber molecular structure was investigated by the combination of atomic absorption spectroscopy, nuclear magnetic resonance crosslinking density meter and gel permeation chromatography. The results indicated that the molecular weight, molecular weight distribution, the concentration of metal ions and crosslinking density, and the gel content of natural rubber presented a significant decrease after the treatment with alkaline protease or phospholipase, which are due to that there exist physical forces or chemical bond between the metal ions and protein, phospholipid in the natural rubber. The presence of protein and phospholipid contributes to the formation of intermolecular cross-linking, increasing molecular and intermolecular network structure.关键词：Natural rubber latex;Protein;Phospholipid;Crosslinking density;Gel content
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发布时间：2022-09-18 - 摘要：This review summarizes the applications of konjac glucomanan (KGM) and its derivatives in medical and healthy area. Discuss the recent use of its on relaxing bowel,losing weight,lowering blood glucose,protecting liver, regulating blood lipid, inhibiting tumor, releasing drugs, being as porous scaffolds and hemostatic agent.关键词：Amorphophalms konjac;Konjac glucomannan(KGM);Medicine
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发布时间：2022-09-18 - 摘要：With the bloom of modern education concepts, a wide-ranging and deep-going revolution of teaching methods, mindsets and organizational form of study is in progress,which plays against the rigescent tradition in experimental teaching brought by the long-term exam-oriented education. Under this condition,it is quite necessary to confirm the flexible teaching principle focused on comprehensive ability,critical thinking and versatile cultivating modes,based on which we can motivate the professional interests and innovative inspiration of the students in experiments of polymer chemistry. With these concepts,we constructed the multi-level curriculum system, reconnecting the teaching units according to the correlation, and expanded the fundamental experiments with more exploration capability. In our experimental teaching practice, all the students were encouraged to adopt the spirits of question and challenge as the dominant roles. Furthermore, the ideas of engineering ethics and professional ethics were also introduced to fertilize the earth of cultivating the leaders, innovator and constructors of the future.关键词：Experiments of polymer chemistry;Course orientation;Course construction
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发布时间：2022-09-18 - 摘要：In the "functional polymers" teaching, a lot of polymer chemistry and physics knowledge have been involved. The relationship between polymer chemistry and physics and functional polymers is complementary. If we can connect polymer chemistry and physics knowledge and the essential question of functional polymers (molecular design,relationship between structure and property) tightly and use them effectively, the students will pay more attention to the study with increased interest. The teaching efficiency, the deep understanding and comprehensive utilization ability of students will also be improved. Based on the teaching practice of several years, this paper discussed that how to utilize the relationship between functional polymers and polymer chemistry and physics,as well as the assistant teaching role of the latter.关键词：Functional Polymers;Teaching;Polymer chemistry;Polymer physics
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发布时间：2022-09-18 - 摘要：In this paper, the competency oriented teaching mode was applied in a polymer major elective course to realize the cultivation objective of high level technical talent for application-oriented college. To reinforce the students' theoretical knowledge, meet their employment demand and improve their key competency, demonstration method, discussion method, case method and transposition teaching method were employed in natural polymer materials course as the complementation for the traditional lecture method. As we reformed the content of the course, teaching methods and evaluation mode, as well as questionnaire survey was carried out to adjust the teaching reform plans, the students' professional ability was consolidated, social capability was enhanced and methodological competency was enriched.关键词：Competency oriented teaching mode;Application-oriented college;Major elective course;Natural polymer materials
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发布时间：2022-09-18
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