最新刊期
卷 18 ， 期 5 ， 2005
- 摘要：The trends and frontier topics in recent years on polymer science,such as polymer chemistry,polymer physics,bio-related or bio-inspired polymers and medical polymers,super-macromolecular chemistry,opto-electronic active polymers,polymer processing,have been overviewed.关键词：Polymer science;Trends of progress;Frontier of discipline
- 4
- |
- 11
- |
- 0
发布时间：2022-09-18 - 摘要：This paper introduced manufacture technologies of macromolecular materials such as synthetic resins、 synthetic fiber and synthetic rubber in domestic.In the field of development of polymerization process technology,the polymerization process technologies in large scale for polypropylene,polyethylene,polyester,polycisbutadiene,SBS thermoplastic elastomer,solution-polymerized SBR,polybuthylene rubber have been successfully developed,and relevant production plants have been built up in China.In the field of development of synthetic fiber manufacture of process technology,important progresses have been achieved for polyester fiber making and polyacraldehyde fiber making in large scale.In the field of development for new grades of synthetic materials,the ratio of specialty grades of synthetic resins,differential ratio of synthetic fiber have been increased in evidence.In the field of new type of chemical materials,the development of synthetic process technology and new grades of non-general purpose synthetic resins such as PET solid polycondensation resin,epoxy resin;polyurthene,and engineering polastics such as polyamide (PA6),PBT,and high performance fiber such as UHMW PE fiber,PBO fiber have been successfully done.Finally,this paper prospected the developing direction and trends of polymer technologies within the Eleventh Five-year Plan period.关键词：Macromolecular materials industry;Technology;Development
- 2
- |
- 9
- |
- 0
发布时间：2022-09-18 - 摘要：Polylactide(PLA) is a kind of important biomedical material for its biodegradability in vivo,innocuity and safe,which has obtained great application in clinic.In order to match the more complex application,it is required to control the degradation rate and mechanical properties of PLA,or to improve its hydrophilicity, biocompatibility and cell affinity etc.So a series of PLA and its copolymers were designed,synthesized and the properties were further characterized.In this paper the progress about the research field decribed above was reviewed. According to the authors’years of research on synthesis and properties characterization of PLA and its copolymers, the paper are classfied as four categories to discuss:(1) copolymerization of lactide with other lactone-type monomers;(2) copolymerization of lactide with macromolecular monomer such as poly (ethylene glycol);(3) copolymerization of lactide with monomers with functional groups;(4) copolymerization of lactide with other natural derivative materials,and their potential applications in biomedical field were described.关键词：Polylactide;Polylactide copolymer;Hydrophilicity;Cell affinity;Tissue engineering
- 3
- |
- 11
- |
- 3
发布时间：2022-09-18 - 摘要：The recent progress in MgCl2-supported Ziegler-Natta catalyst for propylene polymerization has been reviewed in this article,including the effects of electron donor on Ziegler-Natta catalyst,the models of active sites on catalyst and high-impact polypropylene alloy prepared by MgCl2-supported Ziegler-Natta catalyst.关键词：Ziegler-Natta catalyst;Electron donor;Active sites
- 3
- |
- 14
- |
- 6
发布时间：2022-09-18 - 摘要：An advance of studies on PET/PEN blend system on abroad and civil was discussed in this work.The emphases are crystallization prosperities,compatibility,transesterification reaction,crystallization kinetics,rheology and blending condition of PET/PEN blends.The structure and properties of blend system were investigated,and its prospect was predicted.关键词：PET;PEN;Crystallization properties
- 2
- |
- 10
- |
- 4
发布时间：2022-09-18 - 摘要：In the present paper, the studies on cavitation of polymeric materials including bulk polymer, polymer blends and polymer composites were reviewed. The factors affecting the cavitation phenomenon and the effect of cavitation on the properties of materials were discussed and the mechanisms of the cavitation were described, especially for the rubber toughened polymer systems.关键词：Cavitation;Polymeric materials;Mechanisms
- 4
- |
- 12
- |
- 3
发布时间：2022-09-18 - 摘要：The method is introduced in this paper,including its basic theory and analysis,which is used for evaluating compatibility of semi-crystalline polymer blends by isothermal crystallization dynamics using DSC.By this method,not only the mixing state but also the interaction of the polymer blends is determined from the relationship between the blend content and various rate constants.This method had been used successfully for the evaluation of the mixed state of PVDF/PMMA,sPS/aPS and Nylon66/Nylon48 blends.The obtained results were discussed in two aspects of the blend content dependent of the chemical potential difference and the crystal surface free energy.关键词：Isothermal crystallization dynamics;Polymer blend;miscibility;DSC
- 2
- |
- 10
- |
- 2
发布时间：2022-09-18 - 摘要：The use of supercritical CO2 as non-solvent has been attracting attentions in the formation of polymer microporous membrane.Advantages of this method are high mass transport coefficient,rapid drying of the polymer membrane without collapse of the structure,easy recovery of solvent and recycling of CO2 and low toxicity of CO2.The thermodynamics and kinetics theory in the preparation process were presented.The studies on polystyrene, polyacrylonitrile,polyethersulfone microporous membrane etc were mainly introduced.关键词：Polymer Microporous membrane;Supercritical CO2;Polystyrene;Polyethersulfone
- 2
- |
- 10
- |
- 2
发布时间：2022-09-18 - 摘要：Chitosan is one of the most abundant natural polymers and widely distributed in the cuticle of the crustacea such as shrimps and crabs.This biopolymer has very useful functional groups such as hydroxyl,amine and acetamide groups,so it can interact with transition metal ions.This review is a closer look at the absorption abilities, the adsorption mechanism,and structural on metal ions of chitosan and its derivatives.Based on current research, some new and futuristic approaches are thoroughly discussed.In this part,the recent studies on chitosan and its derivatives were reviewed mainly on their absorption abilities for metal ions.关键词：Chitosan;Derivatives;Metal ions;Adsorption
- 2
- |
- 10
- |
- 14
发布时间：2022-09-18 - 摘要：Side chain crystalline polymer having the characteristic of " temperature switch" is a new kind of temperature sensitive intelligence material. Its structure characteristic and the relation between the structure and temperature sensitivity are reviewed. Some applications of Side-chain crystalline polymer on agriculture, packing, medicine, chemical engineering are introduced.关键词：Side-chain crystalline polymers;Temperature switch;Application
- 3
- |
- 11
- |
- 0
发布时间：2022-09-18 - 摘要：This review highlights synthesis,catalytic properties of polymer-supported organic catalysts in the last 25 years,with emphasizing on some recent developments in the direction.The polymer-supported catalysts were first divided into achiral and chiral catalysts,and then divided into different sections according to the chemical reactions catalyzed.Some examples were included in order to make clear comparison based on the catalytic activity and selectivity.Some comparisons were made for achievability of separation and reuse of the supported catalysts.Different kinds of polymer supports were included,e.g.crosslinked polymers,soluble linear polymers and dendrimers.In this first part achiral organic catalysts were detailed.关键词：Organic catalyst;Polymer support;Dendritic polymer;Phase transfer catalyst
- 2
- |
- 10
- |
- 0
发布时间：2022-09-18 - 摘要：Due to their unique structure and excellent properties,carbon nanotubes have triggered considerable interest in the fields of physics,chemistry and material science.The possibility of functionalization carbon nanotubes using various materials has opened a wider field of research.In this paper,the research progress of functional carbon nanotubes composite materials in recent years has been reviewed.Especially,the synthetic methods,electric and magnetic properties and applications have been discussed.关键词：Carbon nanotubes;Electronic and magnetic properties;Functionalization
- 2
- |
- 9
- |
- 0
发布时间：2022-09-18 - 摘要：A new generation of thermoplastic elastomers based on molecular design was introduced in this review, such as polyurethane,star block copolymer,Palm-like polymer,Dumbbell-like polymer,Latex interpenetrating polymer and grafted bends.In comparison to typical preparation,molecular design is more tightly connect to requirements in areas applied.The studies reveal these polymers exhibited improved mechanical and thermal properties.关键词：Thermoplastic elastomer;Molecular design;Star block copolymer
- 2
- |
- 11
- |
- 0
发布时间：2022-09-18 - 摘要：The international researches and developments of molecular diffusion behavior in hydrogels, concerning with theoretic models and experimental methods,were reviewed in this paper.The theoretical models consist of three categories:free volume,hydrodynamic,and obstruction effect models.The experimental methods were divided into two kinds,including intermittent and in-situ method.关键词：Hydrogel;Diffusion;Diffusion coefficient
- 2
- |
- 11
- |
- 3
发布时间：2022-09-18 - 摘要：Research progresses of magnetic field effect on macromolecular conformation are reviewed in this paper.关键词：Magnetic field;Macromolecule;Conformation
- 3
- |
- 11
- |
- 4
发布时间：2022-09-18 - 摘要：A serial of novel liquid crystalline polymers containing rigid core,flexible spacer and (2S,3S)-4′-(2- chloro-3-methyl pentanoyloxy)-4-hexyloxybiphenyl in side chain were prepared.The intermediates and monomers were characterized by 1H-NMR and the polymers were characterized by FTIR.Relative molecular weights of the polymers were characterized by GPC.The liquid-crystal behavior of monomers and corresponding polymers were investigated by differential scanning calorimetry (DSC) and thermal polarized optical microscopy (POM).The result showed that chiral acrylate monomer (P6ACl)exhibited smectic A(SA) and smectic B(SB ) liquid crystalline phases and the corresponding polymer (PP6ACl)exhibited smectic A (SA ) and chiral smectic C* (
- 2
- |
- 11
- |
- 7
发布时间：2022-09-18 - 摘要：Cholesterol hydrophobic-modified chitosan (CS-Chol) were synthesized by coupling cholesterol to the amino groups of chitosan with EDC as catalyzer.The structure of CS-Chol was characterized by FTIR and 1H NMR. CS-Chol formed self-aggregates in water,and the self-aggregate behavior were studied by fluorescence probe technique,the results suggested that the self-aggregates had low critical aggregate concentration about 10-2mg/mL, which was critical to the stability in vivo.The measurements of transmission electron microscope(TEM) and dynamic light scattering(DLS) indicated that the self-aggregates were nanoparticles,and the diameters increased from 180 to 380nm with the decrease of substitute degree from 4.7 to 1.1. The nanoparticles were radio-labeled with 99mTc,and their distribution in cephalosome and abdominal cavity was analysized by SPECT.CS-Chol nanoparticles were eliminated from blood and abdominal cavity quickly.Some nanoparticles,however,retained in the mucous membrane rich area after otic vein injection,due to the feature adhesion of chitosan to the mucous membrane.关键词：Chitosan;Cholesterol;Self-aggregate;Nanoparticles;Radio-label
- 2
- |
- 13
- |
- 0
发布时间：2022-09-18 - 摘要：A novel series of biodegradable polyester were synthesized via esterification of sebacic acid,glycol and glycerol.Fourier transform infrared spectrum (FTIR),X-ray photoelectron spectroscopy (XPS),Differential scanning calorimetry (DSC),X-ray diffraction analysis (XRD) and mechanical tests were performed to examine the properties of polyester.Results showed that the products exhibited typical high elasticity.As the ratio of sebacic acid and glycol in raw material increased,the modulus of the products also increased and the microstructure changed from partly order to disorder.The products had good biodegradability,and the weight losses were between 6.1-14.4% after degradation in the phosphate buffer solution with porcine pancreas lipase at 37℃ for 72h.关键词：Elastomeric polyester;Sebacic acid;Glycol;Glycerol;Biodegradation
- 3
- |
- 11
- |
- 0
发布时间：2022-09-18 - 摘要：The intelligent fibers have an important position and special usefulness in the materials field.In this paper,the train of thought for designing intelligent fibers was reviewed,including bionics,moleculear design and complex technology;the preparing technolegy of intelligent fibers was described,including the direct spinning of intelligent polymer-forming fiber,graft copolymerizion,crosslinking,blending and addition,composite sipinning and hybridization,chemical reaction of polymer as well as post-treatment and so on;it was suggested that the research and development of intelligent fiber should be paid more attention in China.关键词：Intelligent;Fiber;Design;Preparing technolegy
- 2
- |
- 11
- |
- 0
发布时间：2022-09-18 - 摘要：Polycations can condense with DNA by self-assembly,form polyplexes nanoparticles spontaneously as a result of electrostatic interactions and protect DNA from degradation by DNase.They have great advantages used for gene delivery such as ease of synthesis,cel/l tissue targeting,low immune response,Stableness in storage,and unrestricted plasmid size.Polycations as non-viral gene vectors can be divided into two types:synthetic polycations such as PEI,PLL,and PAMAM;and natural polycations such as chitosan,its derivative and gelatin.So development on polyplexes nanoparticles used as controlled gene delivery systems are discussed with emphasis on mechanism of polycation-mediated cell entry and targeting strategies of polycations,also several polyplexes are evaluated with respect to their characters and transfection efficiency,at last it can conclude that nontoxic natural gene vectors should be the focus of studies in the future.关键词：Poly-cation;Nanoparticles;Polyplex;Gene therapy
- 2
- |
- 10
- |
- 1
发布时间：2022-09-18 - 摘要：Macromolecular motion is one of the most fundmental and important issues in polymer science,and it is also a principle point in teaching.The issue is a bridge to connect the microsructure with physical properties of polymers.This paper mainly discusses the characteristics of macromolecular motion,especially the temperature dependence of motion.Therefore the relationship between structure and physical properties of polymers is better understood.关键词：Macromolecular motion;Temperature;Mechanical state;WLF equation;Arrhenius equation
- 3
- |
- 12
- |
- 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