最新刊期
卷 27 ， 期 7 ， 2014
- 摘要：Preparation of polymer/CNTs composite nanofibers using CNTs as reinforcing material is helpful to improve the properties of polymer nanofiber and expand its application fields. This paper introduces the development of CNTs composite nanofibers preparation by electrospinning in recent years at home and abroad,focusing on CNTs/PAN composite nanofibers, CNTs/PANI/PEO composite nanofibers, CNTs/PVA composite nanofibers,CNTs/PA composite nanofibers and CNTs/TiO2 composite nanofibers as well as theirs application in the fields of nano-sensors,electromagnetic interference, super capacitors, dye-sensitized solar cells (DSSCs), tissue engineering,drug delivery. The potential applications and prospect of CNTs nanofibers have also been described.关键词：Electrospinning;Carbon nanotubes;Nanofibers;Composite
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发布时间：2022-09-18 - 摘要：The necessity and importance of research on flame-retardant rigid polyurethane foam are introduced in this paper, the combustion mechanism of rigid polyurethane foam and the flame-retardant mechanisms of fire retardant are reviewed. The mechanisms,features and research progresses of several additive flame retardants are summarized, and composite flame retardants which are the current research focus are discussed. The development of reactive flame retardants are described, then commonly used methods of modification and innovative ideas are introduced. In the end, the flame- retardant development prospect of rigid polyurethane foam is elaborated.关键词：Polyurethane;Rigid foam;Flame retarding
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发布时间：2022-09-18 - 摘要：Because of its inherent characteristics and wide application, Lewis acids have been widely applied in the stereocontrol of radical polymerization. In this paper,a comprehensive review on the Lewis acids mediated stereoregular radical polymerization was made, including the Lewis acids employed, monomers studied,reaction mechanism,and the effect of polymerization condition on the tacticities of the resultant polymers. A short outlook of the future development in the thereof direction was proposed.关键词：Radical polymerization;Tacticity;Lewis acid;Research progress
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发布时间：2022-09-18 - 摘要：Poly(N-alkyl acrylamide) having a special temperature-sensitive performance, good potential applications polymer field and become a research hotspot. This paper reviews linear and poly-N-alkyl gelation temperature sensitive Acrylamide Polymer Research. Describes the synthesis of linear solution radical polymerization of N-alkyl acrylamide temperature sensitive polymer research. Comments chemical crosslinking,physical crosslinking,radiation cross-linked polymer gel N-alkyl acrylamide Thermosensitive Polymer Research, and synthesis method advantages and disadvantages monomer selected and range of applications to linear and gelation temperature sensitive polymer are discussed.关键词：N-alkyl acrylamide;Temperature sensitive polymer;Thermosensitive hydrogel;Critical solution temperature
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发布时间：2022-09-18 - 摘要：Polyvinylidene fluoride (PVDF) membrane with its excellent mechanical and chemical properties is widely used in the field of water treatment. During the long-term operation, the permeation flux of PVDF membrane will significantly decrease due to its strong hydrophobicity and the absorption of organic matters. Therefore, frequent backwashing and chemical cleaning are necessary. This will lead to the decline of mechanical properties of PVDF membrane itself. The operation life of membrane would be reduced with a large increasing of operating costs. Thus, it is very important for the investigation on hydrophilic modification of PVDF membrane. In this paper, the classification of hydrophilic modification method was introduced, and then the details of various modification methods and the present research were well described. Finally, some problems deserving further research and the application prospects of PVDF hydrophilic modified membrane were presented.关键词：Polyvinylidene fluoride membrane;Hydrophilic modification;Surface grafting;Blending;Antifouling
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发布时间：2022-09-18 - 摘要：Ceramifying polymer materials have been developed to replace conventional fire protection materials for their excellent qualities. In this paper, ceramifying silicone rubber was prepared by blending silicone rubber and glass frits. The effects of glass frits on the mechanical and electrical properties were investigated. SEM was used to observe the surface and cross-section of ceramic residue after fired. The results showed that the prepared material has desirable ceramifying properties and the compact, hard ceramic residue could resist high temperature over 1000 ℃. As addition of glass frits increased, fluidity of silicone rubber became worse, tensile strength and elongation decreased to some extent, while shore A hardness increased,both volume and surface resistivity firstly increased and then decreased.关键词：Ceramifying;Polymer materials;Fire protection materials;Silicone Rubber;Glass frits
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发布时间：2022-09-18 - 摘要：By adding hollow glass beads, syntactic polyimide foams were prepared by prepolymerization method. The cell structure, thermal properties and compress properties of polyimide foams filled with hollow glass bead were studied. The results show that with the increasing content of hollow glass bead, the cell structure became fine,thermal stability, the glass transition temperature and compress properties were improved. The temperatures at 5 % weight loss increased by 13. 9 ℃,the glass transition temperature increased by 8. 1 ℃ , compression strength increased by approximately 21 % and compression modulus increased by about 12 % with 20 % content of hollow glass beads.关键词：Polyimide foam;Hollow glass bead;Cell structure;Thermal properties;Compress properties
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发布时间：2022-09-18 - 摘要：Poly[2-(N,N-dimethylamino)ethyl methacrylate] (PDMAEMA) was synthesized by RAFT polymerization of 2-(N,N-dimethylamino)ethyl methacrylate (DMAEMA) , using cumyl dithiobenzoate (CDB) as a chain transfer agent and 2,2'-azobisisobutyronitrile (AIBN) as initiator. The resulting PDMAEMA as a macromolecular chain transfer agent and AIBN as a initiator, poly[2-(N,N-dimethylamino) ethylmethacrylate]-b-poly(acrylamido-azobenzene)](PDMAEMA-b- PAAAB) was prepared by RAFT polymerization of acrylamido-azobenzene (AAAB),and the Kinetics of the polymerization of AAAB was investigated. The resulting PDMAEMA and PDMAEMA-b-PAAAB were characterized by FT-IR, 1H- NMR, GPC and TG. The results showed that the molecular weight of PDMAEMA increases with polymerization time,and the molecular weight distribution was narrower; the molecular weight of PDMAEMA-b-PAAAB increases linearly with the increase of the conversion of AAAB, the molecular weight distribution was less than 1.3,and the kinetic curve of the polymerization of AAAB exhibits a good linear relationship, and has good thermal stability.关键词：2-(N,N-dimethylamino)ethyl methacrylate;Acrylamido-azobenzene;RAFT polymerization;Block copolymer
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发布时间：2022-09-18 - 摘要：The poly (ethyl acrylate/2-ethylhexyl acylate/acrylic acid/methyl methacrylate) seed emulsion with solid content at 55% was prepared by ammonium persulfate-sodium bisulfite redox reaction. Then, a high solid content and low viscosity emulsion in which the solid content from 70% to 74% was obtained using the seeded emulsion as medium, sodium dodecyl sulfate and octylphenol polyoxyethylene ether as emulsifier, sodium bicarbonate as buffer and potassium persulfate as initiator to polymerize the target emulsion at 80 ℃. The results indicated that the obtained seed emulsion was broad peak in particle size, the particle diameter was 150〜300nm, which led to its low viscosity. The high solid content emulsion with a viscosity of 300〜900mPa•s at a shear rate of 20s-1 was still wide distribution and the particle diameter was 350〜600nm. The sealant was made from the high solid content emulsion having advantages of short curing time,small shrinkage, great intensity.关键词：High solid content;Low viscosity;Seed emulsion;Sealant
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发布时间：2022-09-18 - 摘要：In-site optical rheological microscope(ORM) was used to study the non-isothermal crystallization of Poly(L- lactide) (PLLA). The thermal behavior and crystalline properties of PLLA after shear treatment was analyzed by differential scanning calorimetry(DSC) and wide angle X-ray diffraction(WAXD). The result indicated that shear flow had no effect on the crystal type of PLLA but greatly accelerated the crystallization, and improved the initial crystallization temperature. The crystalline morphology of PLLA under shear was mainly influenced by the shear rate. The crystalline morphology of PLLA changed from spherulites to shish-kebabs when shear rate was higher than the critical shear rate (10s-1). As the shear rate increased, more shish-kebabs with smaller size were acquired, the crystal structure was more perfect and the crystallinity increased. Compared with shear rate,shear time had little effect on the crystallization behavior of PLLA.关键词：Poly(L-lactide);Steady shear;Non-isothermal crystallization;Crystalline morphology
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发布时间：2022-09-18 - 摘要：By taking the method of grinding pressure molding to make preparation of the microcellular foam NR composites,and based on compatibility technology,vulcanizing and mechanism of foaming match, the effect law on the foam quality of NR and mechanical properties that brought by different elastomers has been analyzed. The results show that the addition of elastomer and LDPE has made a significant change in the cell structure of themicrocellular foam NR composites. The foam composites formed by adding EVA in the natural rubber has an ideal foam quality, with a cell diameter minimum to 114.83μm and the cell density reaches the maximum of 4. 17 × 106 cm-3 ; To the mechanical properties,The foam composites formed by adding BR in the natural rubber has a bettercomprehensive performance. It' s Shaw hardness is 15,the compression set is 3. 56%,and the impact resilience is 55%. From the perspective of the foam quality and mechanical property,adding EVA in the natural rubber is suitable for the development of the foam NR products.关键词：Natural rubber;Elastomers;LDPE;Foaming behavior;Mechanical properties
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发布时间：2022-09-18 - 摘要：Antimicrobial polymeric quaternary phosphonium salt is characterized by safety and high efficiency. It will not penetrate into human body through skin and be invalidated by photolysis. Through molten extrusion, the concentration gradient of homemade novel antimicrobial polymeric quaternary phosphonium salt were mixed with the matrix material (low density polyethylene, LDPE), and the antibacterial plastics were prepared. The influences of different antimicrobial concentration on the melting properties and antibacterial properties of the plastics were studied, and the biological safety of the plastics was discussed. It was indicated that the modified plastic with different concentration of antibacterial agent all have superior antibacterial activity against S. aureus and E. coli. Biosafety test illustrated that the cytotoxicity of the antibacterial plastics was 0 level and the plastics have high biosafety.关键词：Polymeric quaternary phosphonium salt;Antibacterial plastic;Melting properties;Antibacterial properties;Cytotoxicity
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发布时间：2022-09-18 - 摘要：The monomer PPTPY with piperazine as electron donor and 2,2’:6'2"-terpyridine as electron acceptor was synthesized. Via Zn2+ and Cd2+-directed self-assembly polymerization, the metallo-supramolecular polymers PPTPY-Zn and PPTPY-Cd were obtained. And their structures were determined by NMR. The UV absorption spectra of PPTPY-Zn and PPTPY-Cd showed red shifted 74nm and 59nm respectively in comparison to building block monomer PPTPY in DMAc solution. And the emission maxima of PPTPY-Zn and PPTPY-Cd films are at 549nm and 552nm with half-peak width of 111nm and 113nm, which exhibited orange emission, in films respectively. The cyclic voltammogram showed that the onset oxidative potential of PPTPY-Zn and PPTPY-Cd were 0. 75V and 0. 79V,both of that were lower than that of 0. 84V for PPTPY.关键词：Terpyridine;Electron-donor/acceptor;Metallo-supramolecular polymers
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发布时间：2022-09-18 - 摘要：Polymer topology is an emerging discipline focusing on the spatial arrangement of repeating units in the macromolecular chains, including linear, cyclic, branched, dendritic, supramolecular self-assembled and mechanically interlocked structures. Based on a polymer topology perspective,research on the polymer diversity and its chain complexity could be effectively simplified to some extent. Especially, the topological equivalence concept can be introduced into the classification of polymer chain structures,as well as the transformation relationships among points,lines and rings in the topological structures. This article is not only targeted at the systematic classification of polymer topologies mainly proposed by Tezuka,but also their corresponding application in the topological polymers.关键词：Polymer topology;Topological polymers;Topological equivalence;Topological distinctive
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发布时间：2022-09-18 - 摘要：With the increasing demand of the human society to energy resources, develop the energy storage materials with high performance have attracted much attention. Conducting polymer-metal Oxide composite materials have a lot of properties to match the requirement of cathode materials of energy storage devices such as Li-ion batteries. So the studies on these materials become one of the hot points in the relative research area. In this paper, how these composites could enhance the electrochemical properties of materials by realizing the organic/inorganic synergistic effect were summarized by choosing polyaniline (PAni) and Polypyrrole (PPy) as example. The synthesizing methods,structural features, characterizing methods of structural analysis and the electrochemical properties of these composites were introduced in detail.关键词：Conducting polymer;Metal oxide;Cathode material
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发布时间：2022-09-18 - 摘要：The textbook of "Structure and Properties of Polymers" in English has been published by Alpha Science International Ltd and issued worldwide. In polymer science it is the first textbook in English written by Chinese scientist and published by a foreign press. The manuscript makes clear the writing history and the publishing background of the textbook in Chinese,and the origin of the textbook in English. It is emphasizing that the importance of copyright in writing book in English. The manuscript has pointed out some errors in the textbook in Chinese,and the modifications and revises in that in English. It is hope that the textbook in English will play a positive role for introducing the accomplishments and teaching in polymer physics in China.关键词：Structure and properties of polymers;Alpha Science International Ltd;Textbook in English
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发布时间：2022-09-18 - 摘要：Polymer chemistry is the first professional foundation course for a professional student of polymer material. In the paper, the teaching methods of " polymer chemistry" course was discussed from different aspects, including emphasizing the professional education and the cultivation of interesting, paying attention to the connection and comparison with the basic chemistry, emphasizing the cultivation of scientific research ability, the combination of writing on the blackboard and multimedia during teaching, introduction of the frontiers of professional knowledge,make full use of actual materials in teaching. The teaching quality was improved obviously by utilizing these methods in the teaching practice.关键词：Polymer chemistry;Teaching research;Teaching methods;Teaching quality
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发布时间：2022-09-18 - 摘要：Teaching difficulties in "Functional Polymer Materials" are various curriculum contents,complex concepts, strong profession and less teaching hours. It is very important how to improve the teaching efficiency in the limited teaching time. In the teaching process of "Functional Polymer Materials",teachers may excavate the growing points of classroom questioning in order to improve the efficiency of classroom questioning from the following aspects:(1) ask students the new old knowledge connection; (2) ask students the key place of the concept and principle; (3) ask students the zone of proximal development; (4) ask students the thought disorder; (5) ask students the knowledge structure; (6) ask students the scientific research method; (7) ask students the core of the course.关键词：Functional polymer materials;Classroom questioning;Growing point
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发布时间：2022-09-18 - 摘要：Polymer chemistry is a high theoretical subject covering synthesis and reaction of high molecular compounds, involved with the calculation of some formulas such as polymerization rate and degree of polymerization. But the textbook does not give the derivation process and application of these formulas,how to fully understand and correctly use them is one of the major sticking points in the actual teaching. In this paper, important formulas in the parts of the textbook are studied providing help for better learning and master the theoretical knowledge of polymer chemistry.关键词：Polymer chemistry;Condensation polymerization;Radical polymerization;Formula
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发布时间：2022-09-18 - 摘要：To bring about creative applying talents,the " one center, two penetrations, three promotions, four combinations " experimental teaching model was constructed. Application of this teaching model in teaching of polymer chemistry experiment was summarized, and the prerequisites to ensure successful implementation of this teaching model were put forward. The results indicate, we must build up the ranks of teachers, enhance teaching resources construction, and improve the communication environment, in order to make the experimental teaching model realized smoothly. This teaching model applied in polymer chemistry experiment teaching show that it contribute to cultivating the innovation spirit and the practice ability of the students and speeding up creative applying talents training.关键词：Experimental teaching model;Experimental teaching;Applying talents;Polymer chemistry experiment
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发布时间：2022-09-18 - 摘要：" Mechanical internal friction dissipation" is of most importance in introducing viscoelasticity of polymer. But some details of its derivation process were eliminated from the textbook, which result in a difficult understanding of this part for the students. In order to achieve better teaching results,the authors divided the strain under cyclical stress into two parts,namely ideal elastic deformation and ideal viscous flow respectively, then derived the energy consumption in a deformation cycle and the energy storage at any given time; and cleared "why the system has a maximum energy storage in 1/4 cycle" and the mechanical internal friction dissipation was obtained. Practices show that the vast majority of students can be have an easy acceptance of the derivation in this way, and have a good understanding of the concept of mechanical internal friction dissipation.关键词：Polymer physics;Mechanical internal friction dissipation;Maximum energy storage
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发布时间：2022-09-18
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