最新刊期
卷 28 ， 期 5 ， 2015
- 摘要：Polyolefin-block-polar-polymer block copolymer ( POBP), consisting of both nonpolar/unfunctionalized polyolefin block(s) and polar/functional polymer block(s) that are covalently bonded together, have drawn much attention due to their unique structure and performance characteristics. The traditional use of POBP as a polyolefin and other materials (polar polymer, e.g. ) of the compatibilizer,in recent years, POBP find new applications in emerging research fields, including porous membrance, functional hybrid nanomaterials and solid polymer electrolyte, etc. Two main types of methods are employed in preparation of POBP : (1) Mechanism transformation from coordination polymerization to other polymerizations, that is, to initiate polymerization of polar monomer using polyolefin macroinitiator prepared by coordination polymerization; (2) Coupling reactions between reactive/functional end-groups of polyolefins and polar polymers. Herein we review the very recent progress on POBP, with an emphasis on the newly developed methods of POBP and emerging applications of POBP on the horizon.关键词：Polyolefin-block-polar-polymer;Block copolymer;Macroinitiator;Macro-RAFT agent;Functional material
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发布时间：2022-09-18 - 摘要：Surface molecularly imprinted polymers (SMIPs) have attracted increasing research interest with potential applications such as chromatographic separations, solid phase extraction and chemo/biosensors in the last decade. The surface imprinting technology attempts to build molecular recognition systems on the supporting materials surface and enables template molecules to locate in the proximity or at the surface of the MIP. So compared to the conventional imprinted polymers, SMIPs exhibit more complete removal of templates, higher binding capacity, and faster binding kinetics. This short review discusses the recent progress in the field of surface molecularly imprinted technology and summarize the various supporting substrates employed to build molecular imprinted polymer with focus on the silicon material, magnetic material, carbon nanotubes and graphene.关键词：Surface molecular imprinting;Silicon material;Magnetic material;Carbon nanotubes;Graphene
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发布时间：2022-09-18 - 摘要：Thermoplastic elastomers (TPEs) are a class of polymeric materials that have widespread applications and development potentials. However, the majority of raw materials (including monomers and polymers) used in the present commercial TPE grades are derived from non-renewable petroleum-base resources. As one kind of biobased aliphatic polyesters with the great potential to replace petroleum-based polymers, poly (lactic acid) ( PLA) exhibits many advantages, such as abundant sources of raw materials, excellent biodegradability,and high strength/modulus, etc. Therefore, the research on PLA TPE has attracted extensive attentions from many domestic and foreign scholars. This paper reviewed the latest research progress in the fields of PLA block copolymer-type TPEs and PLA-based thermoplastic vulcanizates. And preparation routes and properties of both TPE materials were presented in detailed, and the existing problems in these TPE studies, was finally pointed out.关键词：Thermoplastic elastomers;Biobased;Poly (lactic acid);Block copolymers;Dynamic vulcanization
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发布时间：2022-09-18 - 摘要：Foaming material can be regarded as a gas filled polymer composite with large amounts of bubbles in a polymer matrix. The merits of low mass, high specific strength, sound-absorbing and heat-insulation make it very competitive in building, automotive industrial, packaging industry, aerospace fields and household electrical appliances. Polypropylene can be well suited to serve as a polymer matrix to prepare foaming material due to its excellent thermal, mechanical properties and chemical stability, foaming PP become the most potential composites in the 21st century after PS and PE foaming material This paper summarized the progress of the preparation methods, cell morphology, modification methods, applications and outlooks of expanded polypropylene (EPP). This paper may provide theoretical foundation for the applications and developments of EPP.关键词：Polypropylene;Foaming;Modification
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发布时间：2022-09-18 - 摘要：In recent years, collagen based electrospun fibers are being studied and developed because they hold considerable promise for realizing some advantages of biological activities and nanostructured materials. This paper reviews the progress and problems of collagen based fibers prepared by electrospinning. Subsequently, the applications of collagen based electrospun fibers in tissue engineering, hemostasis and wound healing, drug delivery as well as anti-adhesion were discussed. Finnally, some existing problems and personal perspectives on the future development of collagen electrospinning nanofibers were put forward.关键词：Collagen;Electrospinning;Crosslinking;Blending;Application
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发布时间：2022-09-18 - 摘要：The bending of the basic shaft inside the natural rubber latex-made balloon catheter caused the stretching deformation of the basic shaft which is resulted from the introduction of nominal capacity of air or sterile water into the balloon using charging funnel was investigated. The experimental results showed that, the control of the basic shaft diameter of the catheter to a rational value, the control of the single-layer thickness of balloon film from 0. 50 to 0. 65mm, the using of low-modulus prevulcanization formula,and the using of prevulcanized blend of natural rubber latex concentrate and 20 phr of MG 49 latex as the basic shaft compound or incorporation of 30 phr of calcium carbonate into the compound for the basic shaft to increased to hardness of the shaft are effective methods to reduce the bending of the basic shaft of natural rubber latex-made balloon catheter.关键词：Natural rubber latex;Balloon;Catheter;Bending of basic shaft
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发布时间：2022-09-18 - 摘要：Chitosan (CS) is a polycationic biopolymer, one of the most abundant natural polysaccharides in nature. With numerous desirable properties such as good biocompatibility, biodegradability,pH response,non-toxicity and no stimulation to human tissues, chitosan has emerged as a promising drug delivery. The PMA30 was synthesized by free radical polymerization of 2-methacryloyloxyethyl phosphorylcholine (MPC) and methacrylic acid (MA) with the MPC monomer molar percentage in the feed of 30%. The CS-PMA30 polyelectrolyte hydrogel was prepared through electrostatic interaction between chitosan polycation and PMA30 polyanions. In vitro drug release of coomassie brilliant blue G-250 from the CS-PMA30 hydrogel was determined by dialysis method. The results suggest that the CS-PMA30 hydrogel with phosphorylcholine groups is a good system for drug delivery due to pH-sensitive and biocompatibility may have potential applications in the fields of drug delivery, and tissue engineering.关键词：Chitosan;Phosphorylcholine;Hydrogel;Controlled release
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发布时间：2022-09-18 - 摘要：The salt resistance of surfactants and Partially hydrolyzed polyacrylamide (anionic) ( HPAM) combined system was studied by measuring the viscosity of the combined system of HPAM with anionic surfactant (SDS),nonionic surfactant (OP-10) and ampholytic surfactant (C12BE). The results show that when the concentration of inorganic salt was constant, the viscosity of the combined system of HPAM with SDS and C12 BE increased firstly and then decreased, but with OP-10 increased firstly then became constant afterwards. When the concentration of surfactants was in the under of the critical association concentration (CAC),the viscosity of polymer solution was little changed ; when the concentration of surfactants exceeded the CAC, the viscosity of polymer solution increased; when the concentration of surfactants reached the Polymer critical saturation concentration (PSP),the viscosity reached to the peak value; and then if the concentration of SDS and C12 BE increased once more,the viscosity decreased, but if the concentration of OP-10 increased again, the viscosity of polymer solution became constant. The effect of inorganic salt on the viscosity of the polymer solution changed with concentration of inorganic salt. The viscosity increased at low concentration, decreased sharply at high concentration, and then trend to be constant at last. In the same concentration range of inorganic salt, the salt resistance capacity of three surfactants was SDS>OP-10>C12 BE.关键词：HPAM;Surfactant;KCI;Viscosity;Salt resistance
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发布时间：2022-09-18 - 摘要：The relative size of hardness, the surface and fracture morphology, the degree of graphitization and microcrystalline structure of Domestic JHT45-T700 and Toray T700 carbon fibers were investigated by atomic force microscopy ( AFM),scanning electron microscopy ( SEM) , Raman spectroscopy, X-ray diffraction ( XRD) and transmission electron microscope(TEM). The microstructure differences of the two carbon fibers were compared. Results showed that the hardness of Toray T700 was greater than Domestic JHT45-T700. The surface of Toray T700 was smooth. Domestic JHT45-T700 possessed of better wetting property with resin matrix due to many prominent grooves on the surface. Raman and XRD results indicated that the degree of graphitization, the size of crystallite and the order degree of Toray T700 were superior to Domestic JHT45-T700. The lattice fringe of Toray T700 was more orderly,the proportion of crystalline phase was larger and graphite crystallite grew more perfect.关键词：Carbon fiber;Hardness;Surface feature;Graphitization degree;Microcrystalline structure
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发布时间：2022-09-18 - 摘要：The acrylic resin was prepared by adjusting the content of the hard segment (methyl methacrylate) and the soft segment (ethyl acrylate, butyl acrylate) with the AIBN as initiator by free rae acrylic resin by using the neutralization reaction. Finally, four types of copper acrylate resin were prepardical polymerization, then the copper hydroxide was introduced into the side chain of thed. The structure of the resin was analyzed by IR and GPC, IR validated that the C = C absorption peaks disappeared completely, GPC confirmed that the average molecular weight of the resin is 11000〜13000, indicating that the polymerization reaction was completed; The thermal properties of the resin was studied by DSC and TGA,the glass transition temperature ( Tg ) increased linearly with the increase of the methyl methacrylate content, the thermal stability decreased with the increase of hard segment content. SEM found that the copper ions dispersed uniformly in the resin system, XRD showed that the resin have an amorphous structure. In addition, the four kinds of resin adhesion are excellent,viscosity of resin solution increases modestly with the increase of the hard segment content.关键词：Copper acrylate resin;Hard and soft segments;Synthesis;Characterization
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发布时间：2022-09-18 - 摘要：The synthesis of degradable aliphatic polycarbonates (APCs) from greenhouse gas carbon dioxide and epoxides has been a long-standing hotspot in the field of polymer science. Polypropylene carbonate (PPC) produced by the alternating copolymerization of CO2 and propylene oxide has received the most attention because it exhibits many excellent properties and has a wide range of potential applications. Unfortunately, PPC is a weak polar hydrophobic polymer with weak interchain interaction, leading to its relatively low thermal stability and poor mechanical properties. These have limited PPC to practical applications as well as large-scale production. Chemical modification including terpolymerization, block copolymerization, graft copolymerization, chain extension, cross-linking, end-capping and so on is the most immediate and effective route to regulate the chain structure of PPC and further improve its properties. The present paper exhibits a brief review in the recent progress about this topic and discusses the existing problems. Some proposals about the chemical modification of PPC are put forwards to facilitate the development and applications of PPC.关键词：Carbon dioxide;Epoxides;Poly (propylene carbonate);Chemical modification
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发布时间：2022-09-18 - 摘要：In the teaching of "Polymer chemistry", some generic concepts often cause the confusion for the students, such as the definition of molecular weight of polymer, the residual water content of condensation reaction, the polymerization selectivity of monomer and the polymerization ability of vinyl acetate etc. According to the experience and understanding obtained in the many years' teaching process, these generic concepts are cleared. They can be referenced in teaching process for the colleagues and in the learning process for the students.关键词：Polymer chemistry;Generic concept;Clearing
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发布时间：2022-09-18 - 摘要：This paper introduces the author's teaching experience on the freshman seminar course to build the Chinese popular science website on polymers. Following the new situation of teaching reform for " three-three policy"at Nanjing University, the author set up freshman seminar course,guided the course students in several groups to choice a subject under the course title " Macromolecules-from Materials to Life"and to build a website introducing the related knowledge in the style of popular science. In this way, the students could learn the concepts of collaborative study and explorative study in order to fit better into the study in the modern university. The produced website " Garden of Macromolecules" is now beginning to take shape and expecting more participation of colleagues.关键词：Polymer;Popular science;Website;General knowledge courses
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发布时间：2022-09-18 - 摘要：In experimental course of polymer chemistry, a free radical polymerization for the preparation of high molecular weight polyacrylamide in aqueous solution through the method imitating the industrial process could be adopted. The preparation is carried out under high monomer dose,non-thermostatic,non-stirring condition using the combination of redox initiator, azo initiator and peroxide initiator. The aqueous free radical polymerization has the advantages of low energy consumption and high efficiency. This practical experiment will be beneficial to the students for their broadening knowledge and better understanding of curse knowledge. Meanwhile, it is also useful to train the students with good environmental protection and energy-saving awareness,the ability to integrate theory with practice.关键词：Experimental course of polymer chemistry;Industrial production process;Free radical polymerization;Aqueous solution polymerization
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发布时间：2022-09-18 - 摘要：Reformation of polymer materials processing is one of the most important specialized courses for the students majoring in polymer materials chemistry. The curriculum framework has been adjusted,and the teaching contents have been organized reasonably according to the feature of the material chemistry graduate's areas of employment. In order to improve students' ability of absorbing professional knowledge, teaching method has been improved through multimedia teaching and experiment teaching as well as practical teaching. On the other hand, integration of theoretic teaching with practical teaching was strengthened for developing student's ability of analyzing and solving problems independently. Furthermore,theoretic teaching combined with scientific research. As a result, students' interest was cultivated, and also the theory knowledge application in production practice was actualized to meet the social demand for professional talents.关键词：Polymer materials processing;Multimedia teaching;Experiment teaching;Practical teaching
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发布时间：2022-09-18
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