最新刊期
卷 29 ， 期 1 ， 2016
- 摘要：The latest progresses in polymer science are briefly highlighted. The issues appeared in recent application proposals are analyzed and the relevant suggestions are provided. The information on funding program in 2015 is introduced. Finally, the guidance for 2016 polymer program in NSFC is released.关键词：2016 Guidance of national natural science foundation of China;Highlight of recent progress in polymer science;Frontier and trend
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发布时间：2022-09-12 - 摘要：Polyolefin alloys are multi-component polyolefin materials by using in-reactor polymerization technologies. In this paper, the structure and properties of polyolefin alloys were reviewed in the aspects of fractionation methods, components and properties of polyolefin alloys. The fractionation mechanisms of polyolefins, such as solvent extraction fractionation, temperature-gradient extraction fractionation, temperature rising elution fractionation, isothermal fractionation and gradual crystallization fractionation, were illustrated in detail. The compositions and properties of PP/EPR, PP/PE and PP/PB alloys were discussed especially. The development tendency of polyolefin alloys was evaluated.关键词：Polyolefin alloys;Fractionation;Characteristics;Properties
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发布时间：2022-09-12 - 摘要：In order to accelerate hemostasis, prevent bacterial infection and promote wound healing, wound dressing materials should be applied immediately when skin is damaged. In this paper, on the basis of the classification of the wounds and the choice of dressings, the production, drying and molding technologies of wound dressing materials as well as methods of drug loading are introduced. Meanwhile, we summarize the studies on the natural polymer and synthetic polymer wound dressing materials. Natural polymer has been used to heal defect of tissues and skins caused by burns and wounds, because of its good biological compatibility and biodegradability. And synthetic polymer has many advantages, such as long shelf-life, strong mechanical properties and low inflammatory response, and has almost no risks which carries and spreads bacteria. Nowadays, modified natural polymer, synthetic polymer and their composites are being paid more and more attention in the fields of biomedicine and material science. In the future, the researches and applications of wound dressings will be greatly promoted by the development of nanotechnology and controlled delivery technology.关键词：Wound dressings;Drug loading;Natural polymer;Synthetic polymer
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发布时间：2022-09-12 - 摘要：Thermo-responsive polymers are wildly used in sensors, nanotechnology, gene engineering, and other fields. Poly(N-isopropylacryl amide), poly[oligo(ethylene glycol) (meth)acrylates] and pyrrolidone based polymers are typical thermo-sensitive polymers. However, traditional thermo-responsive polymers displayed relatively monotonous function. With the development of technology, thermo-responsive polymers were expected to display multi-stimuli sensitive mechanism, biocompatibility, bio-degradation and other functions. Amino acids/polypeptides have the characteristic of chirality, biocompatibility, multifunctional group and diverse secondary structures. Using amino acids/peptides to synthesize thermo-responsive polymers can incorporate the advantages of bio-molecule and the superiorities of synthetic polymers together. The research progress of this hybrid material is reviewed.关键词：Amino acid derivate;Polypeptide;Thermo-responsive;Hybrid materials
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发布时间：2022-09-12 - 摘要：Polypropylene (PP) is one of the widely used materials in medical apparatus and instruments, owing to its inexpensive, non-toxic and excellent mechanical properties. When hydrophobic polypropylene is exposed to blood, plasma proteins are adsorbed to the surface, and then surface-induced platelet adhesion, subsequent thrombus and hemolysis occur. Hemocompatibility is one of major problems that limit the long period application of biomedical materials. In this paper, the recent progress of the surface modification of polypropylene, the methods and monomers to improve hemocompatibility are reviewed. Meanwhile, limitation of the modification and the prospect of polypropylene with hemocompatibility were presented.关键词：Hemocompatibility;Polypropylene;Surface modification;Biomedical polymer materials
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发布时间：2022-09-12 - 摘要：Carbon quantum dots (CQDs), a novel class of carbon nanomaterials, have received wide attention due to their strong quantum confinement effect and stable photoluminescence property. Compared with traditional metal quantum dots, CQDs also show relatively lower toxicity and better biocompatibility for potential biological applications. Brief introductions of synthetic methods are summarized here, focusing on two main directions: top-down route and bottom-up route. The prominent physicochemical properties including photoluminescence, low toxicity and up-conversion photoluminescence are reviewed in details. Furthermore, current applications in bioimaging are introduced in the review.关键词：Carbon quantum dots;Photoluminescence;Low toxicity;Up-Conversion;Bioimaging
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发布时间：2022-09-12 - 摘要：Based on the shell materials of microencapsulated APP, the inorganic covering, the organic resin covering, double-layers or multi-layers covering and nano-material covering of flame retardant were reviewed, and the recent research progresses on the preparation of microencapsulated APP by in-situ polymerization were summarized. In the forming process of microencapsulated APP, in-situ polymerization method and mechanism of ammonium polyphosphate and microcapsule coated shell material were introduced. The synergistic effect between flame retardants in the process of burning materials also has been discussed. In the end, combined with the current problems in microencapsulated APP, the prospect in the field of in-situ polymerization was expected in flame retardant materials.关键词：In-situ polymerization;Flame retardancy;Synergistic effect;Microencasulation;Ammonium polyphosphate
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发布时间：2022-09-12 - 摘要：DETDA/DGEBA and mPDA/DGEBA of unit cells were prepared, respectively. The structure-property correlation in epoxy resins was studied by using molecular dynamic method. The results show that the Tg, modulus of mPDA/DGEBA are higher than that of DETDA/DGEBA, and the diffusibility of water molecular of mPDA/DGEBA is lower than that of DETDA/DGEBA. To understand the different properties of the resins at molecular level, the free volume of epoxy resins and the cohesive energy density were investigated. It was found that the mPDA/DGEBA system had small free volume and low cohesive energy density. The small free volume and low cohesive energy density can result in high value of Tg and modulus, it also can result in low value of the diffusibility of water molecular.关键词：Epoxy resin;Glass transition temperature;Cohesive energy density;Molecular simulation
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发布时间：2022-09-12 - 摘要：The aim of this study was to improve the yields of sugar with enzymatic hydrolysis on 2% sulfuric acid pretreated corn straw using pectinase, β-glucosidase and cellulase. The results showed that the yields of glucose, xylose, and enzyme hydrolysis were 67.83%, 3.25%, and 73.65%, respectively, when the pretreated corn straw was hydrolyzed using pectinase, β-glucosidase, and cellulase were 45U/mL, 30U/mL and 60U/mL for a period of 48 h. Compared with single cellulose enzymatic hydrolysis, the yields of glucose, xylose and enzymatic hydrolysis with compound enzymes increased to 65.04%, 20.82%, and 65.06%. The yields of ethanol with compound enzymes increased to 72.5% in the step by step fermentation for 5 days. These results suggest that the mixture of three kind of enzyme can obviously increase the yield of sugar with enzymatic hydrolysis. The research results provide an important reference for the research of corn straw into fermentable sugar technology.关键词：Biomass;Corn straw;Acid hydrolysis;Enzymatic hydrolysis
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发布时间：2022-09-12 - 摘要：Using wood powder as filler and polyethylene(PE) and polyprolene(PP) as matrix,wood plastic composites(WPC) were prepared by calendaring-molding process and extrusion-injection molding process respectively. The properties of the composites were comparatively studied by mechanical property, thermal property and rheological property. The results indicated that the calendaring-molding process was more suitable for the production of PE-based WPC, while the extrusion-injection molding process for that of PP-based WPC. And the PE-HD composites had the best comprehensive mechanical properties, the PE-LD composites had the best impact toughness, but the worst comprehensive mechanical properties.关键词：Wood plastic composite;PE;PP;Processing method;Mechanical property;Thermal property;Rheological property
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发布时间：2022-09-12 - 摘要：The surface mechanical behaviors of the PVA film with hydrogen bonds and the PMMA film were studied by nanoindentation. In contrast with the PMMA film, the obviouse displacement burst was observed in the load-displacement curves for the PVA film, the structural difference between the PVA and the PMMA suggests that the hydrogen bonds induced the appearing displacement burst in the PVA film. In order to prove the interdependency of the displacement burst with the hydrogen bonds, The single crystal of hydroquinone was prepared and the surface mechanical behaviors of the single crystal of hydroquinone also were studied through nanoindentation.The results show the single crystal of hydroquinone has cage structure which is composed of the hydrogen bonds, the obviouse displacement burst and creep burst were found in the load stage the load-displacement curves and in the displacement-time curves when holding load is less than the critical load,furthermore, the increased amount value of the displacement burst increases linearly with critical load, the displacement burst also associates with the loading rate simultaneously.关键词：Hydrogen bonds;PVA;Nanoindentation;Displacement burst;Single crystal of hydroquinone;Creep burst
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发布时间：2022-09-12 - 摘要：In this paper, the research progress on synthesis and electrochemical applications of the different polyaniline (PANI) morphologies has been reviewed. The classifications and preparation methods of different shaped PANI have been exposited. And the chemical oxidation polymerization for preparing PANI was highlightly introduced in details. The effects of parameters such as concentration of aniline and oxidant, temperature, pH, surfactant and dopant on PANI morphologies have been discussed. The applications of PANI in supercapacitor, sensor and antirot material have also been summarized.关键词：Polyaniline;Chemical oxidation polymerization;Electrochemistry
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发布时间：2022-09-12 - 摘要：Local universities have become the important parts of high education in China. Due to their differences from the general universities in the educational goals, source composition and service area, their production practice meets with various difficulties. Exploring effective approaches to solve these difficulties have become the urgent problem of local universities to be solved. This paper takes Guangdong University of Technology (GDUT) for instance and analyzes its running characteristics and current status of production practice in polymer materials and engineering. A new mode for production practice of GDUT using the college union as the platform is introduced. The detailed implementation plans for this new mode are explained. The mode is based on the synergistically creative strategy and has achieved favorable results.关键词：Local university;Polymer;Production practice;Synergistically creative
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发布时间：2022-09-12 - 摘要：Polymer chemistry is an important basic course of polymer major. It is very important of cultivating the students' ability of dialectical thinking and teaching them unity of opposites and development sight to view the problem in the teaching process for the improvement of students' scientific research and technology development capabilities. Teachers should use the method of dialectical thinking to explore the thought essence in the contents of the course during the teaching process, meanwhile, make full use of method of thinking reflected in the literature resources, build extensive connections of the contents, guide the students to discus in-depth, develop the habit of thinking comprehensively and thoroughly about the problem from different angles, improve the ability of find and solve problems, and gradually form a scientific thinking ability.关键词：Polymer chemistry;Dialectical thinking;Unity of opposites;Development
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发布时间：2022-09-12 - 摘要：Combining with the project master’s teaching present situation at home and abroad, the existent questions for the domestic engineering master, which the research direction and the enterprise needs to solve the problem are derailment and theory class time is lack, are analyzed. On the basis of using the foreign advanced experiences, put forward the double tutorial system and flexible training mode to cultivat innovation experiment ability, and train "to retain and use" senior applied talents of polymer materials engineering practice and innovation ability for enterprise.Through the practice and exploration of training mode of the innovative experiment ability for polymer materials engineering master, make the engineering master graduate student get improvement in the theoretical knowledge and practical ability and innovative thinking.关键词：Engineering master;Innovation experiment ability;Training mode
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发布时间：2022-09-12
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