最新刊期
      卷 20 ， 期 3 ， 2007
      • Ji-chao QIAO,Xiao_ling HU,Tuan_hong ZHANG,Ping GUAN
        Vol. 20, Issue 3, Pages: 1-7(2007) DOI: 10.14028/j.cnki.1003-3726.2007.03.001
        摘要：In this paper, a review was given about the microencapsulation technology.Application of microencapsulation, which including supercritical fluid technology and solvent evaporation methods, in biomedicine were discussed.And the research trends of microencap_sulation were also described.  
        关键词：Supercritical fluid;Microencapsulation;Preparation;Solvent evaporation methods   
        2
        |
        10
        |
        2
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 29983633 false
        发布时间：2022-09-18
      • Ding-sheng YU,Rong XUE,Ri-wei XU
        Vol. 20, Issue 3, Pages: 8-16(2007) DOI: 10.14028/j.cnki.1003-3726.2007.03.002
        摘要：Fractal and fractal dimension theories applied on catalysts were introduced in this paper.Three methods, including box_counting, scattering and absorption measurements were common in the research of catalysts. The development of fractal catalysts study in recent years was analyzed from four aspects:selection and assessment of catalysts, fractal pore structure, reaction dynamics and mathematics model.Prospect of fractal theory application on catalysts was predicted from the measurement of fractal dimension, catalysts fractal growth model and multifractal reaseach.  
        关键词：Fractal;Fractal Dimension;Catalyst   
        2
        |
        10
        |
        1
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 29983627 false
        发布时间：2022-09-18
      • Hong-yan ZHANG,Wei-wei LIU,Hua-ping WANG
        Vol. 20, Issue 3, Pages: 17-22(2007) DOI: 10.14028/j.cnki.1003-3726.2007.03.003
        摘要：Ionic liquids are organic salts which are liquid near ambient temperatures. They are non-volatile, highly polar solvents that dissolve several organic, inorganic and metal organic compounds. Although there is an increasing number of reports dealing with the application of ionic liquids as solvents for organic synthesis, their use in polymer synthesis is still limited. In the last few years, however, it has been shown that ionic liquids can be advantageously used also for polymer synthesis. In radical polymerization the increase of Kp/Kt ratio for polymerizations conducted in ionic liquids has been observed. Specially, application of ionic liquids as solvents for Atom Transfer Radical Polymerization facilitates separation of the polymer from residual catalyst and reduces the extent of side-reactions. This paper has mainly discussed the principle and feature of atom transfer radical polymerization as well as the applications of ionic liquids in the atom transfer radical polymerization. It has also introduced the previous works and the development prospect of ATRP.  
        关键词：Ionic liquids;Solvent;Atom transfer radical polymerization   
        2
        |
        9
        |
        7
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 29983635 false
        发布时间：2022-09-18
      • Min LI
        Vol. 20, Issue 3, Pages: 23-29(2007) DOI: 10.14028/j.cnki.1003-3726.2007.03.004
        摘要：Non_covalent interaction is often used to construct various supermolecules, in which the electrostatic interaction becomes the most effective driving force and has been widely applied to the layer_by_layer assembly between polyions.In this paper, the preparation of layer_by_layer assembly films of nanoparticles based on non_ covalent force was briefly introduced.The methods for characterizing the composition 、morphology 、thickness and structure of the multilayer films was summarized.The fundamental mechanism on the forming of multilayer assembly films was analyzed and the electrostatic interaction was considered to be the leading driving force.Several common types of nanoparticle layer_by_layer assembly were described.The potential application of nanoparticle layer_by_layer assembly was also discussed.  
        关键词：Nanoparticle;Layer_by_layer assembly;Electrostatic interaction   
        2
        |
        9
        |
        1
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 29983628 false
        发布时间：2022-09-18
      • Li-xin CHEN,Hua MIAO,Jia-le SONG,Chen-li JING
        Vol. 20, Issue 3, Pages: 30-36(2007) DOI: 10.14028/j.cnki.1003-3726.2007.03.005
        摘要：CEM-3 copper clad laminates (CCL) were made from epoxy bromide A80, curing agents of phenolic novolac (PN), bisphenol F novolac (BPFN) and bisphenol A novolac (BPAN) with accelerants of DMP-30, HMTA and 2-MZ. The effects of these three novolacs on the properties of CEM-3CCL, such as mechanical properties, electrical properties, water absorbance and heat resistance, were discussed. The results show that the mechanical properties of CEM-3CCL fabricated by the three novolacs don’t have distinguished difference. The water absorbance, dielectric properties and Tg of CEM-3CCL from high to low are PN>BPFN>BPAN, BPFN≈BPAN>PN and PN> BPFN>BPAN, respectively. The color–changing resistance of CEM-3CCL fabricated by BPFN and BPAN employed as curing agents is superior to that of CEM-3CCL fabricated by PN under the condition of 150℃/2h post-treatment.  
        关键词：CEM-3 copper clad laminates;Novolacs;Properties   
        2
        |
        9
        |
        0
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 29983636 false
        发布时间：2022-09-18
      • Jian-hua SONG,Jian-hua ZHANG,Min XU,Wen DONG,Shi-heng GUO
        Vol. 20, Issue 3, Pages: 37-40(2007) DOI: 10.14028/j.cnki.1003-3726.2007.03.006
        摘要：High reactive penta-coordinated organic silicon was prepared via the reaction of silica with ethylene glycol and potassium hydroxide. Tetra-coordinated silicon monomer with a double bond was produced by the reaction of this penta-coordinated silicon with 4-vinylbenzyl chloride. Then the copolymer with silicon-containing branch was prepared. by the free radical polymerization of this tetra-coordinated silicon monomer with HEMA. The tetracoordinated silicon monomer and its copolymer were characterized by FTIR, EA, EDS, TG, DSC, GPC, etc. An adsorption band of IR spectrum at 1630cm-1 for C=C was indicated for tetra-coordinate silicon monomer, but disappeared for the copolymer. TG analysis showed the co-polymer began losing weight at 343℃. The glass transition temperature was 48.1℃.  
        关键词：Tetra-coordinated silicon;Free radical polymerization;HEMA   
        2
        |
        10
        |
        1
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 29983702 false
        发布时间：2022-09-18
      • Yi LI,Rong-shi CHENG
        Vol. 20, Issue 3, Pages: 41-49(2007) DOI: 10.14028/j.cnki.1003-3726.2007.03.007
        摘要：Many theoretical models and analytical techniques have been proposed for the protein adsorption on the solid surfaces. The adsorption process of preotein includes several steps such as molecular transfer, adsorption, rearrangement, exchange and desorption. The state of protein on the surface depends on the surface property, static electronic interaction, the self-performance of protein and the surrounding chemical conditions. The conformational changes often take place upon adsorption and arose the increasing of entropy.  
        关键词：Protein;Solid surface;Adsorption   
        2
        |
        9
        |
        6
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 29983693 false
        发布时间：2022-09-18
      • Xue-li ZHONG,Shuai LOU,Wen-bin LI,Pu-yu ZHANG
        Vol. 20, Issue 3, Pages: 50-54(2007) DOI: 10.14028/j.cnki.1003-3726.2007.03.008
        摘要：The formation of inorganic materials with special structure and properties was controlled by organic templates through biomimetic synthesis. Polymer is one of the most applicable organic templates which control the nucleation, growth, and alignment of inorganic particles to produce organic/inorganic hybrids with multistep architecture, special morphology and good properties in mild conditions. The progress of polymer application in biomimetic synthesis is reviewed. Problems and a perspective in this research field are also discussed.  
        关键词：Biomimetic synthesis;Polymer;Apatite coating;Morphological control   
        4
        |
        11
        |
        1
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 29983706 false
        发布时间：2022-09-18
      • Lian-chao ZHU,Gong-ben TANG,Qiang SHI,Jing-hua YIN
        Vol. 20, Issue 3, Pages: 55-60(2007) DOI: 10.14028/j.cnki.1003-3726.2007.03.009
        摘要：Some practical applications of rare earth compounds in polymer science and engineering, such as catalyst for polymerization of olefin, heat stabilizer for PVC, modifier and filler, functional materials, and so forth, are briefly reviewed in this article.In addition, some recently research results of our team are also presented.  
        关键词：Rare earth compound;Catalyst;Heat stabilizer;Modifier;Functional material   
        2
        |
        9
        |
        5
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 29983705 false
        发布时间：2022-09-18
      • Ming-ming DENG,Jiu-gao YU
        Vol. 20, Issue 3, Pages: 61-66(2007) DOI: 10.14028/j.cnki.1003-3726.2007.03.010
        摘要：Aliphatic polyesters is a kind of biodegradable polymer. Enzyme catalyzed synthesis of polyesters is a new technique of polymer synthesis and is an eco-friendly process having several benefits over conventional chemical polymerization. Specific enzyme catalysis provides a novel synthetic route for useful polyesters, many of which are difficult to be synthesized by conventional methodologies. In this article, lipase-catalyzed ring-opening polymerization of lactones, step-growth polycondensation of diacids and diols, hydroxy acids and transesterification of diesters with diols has been reviewed in detail. The effect of reaction parameters, i. e. solvent, temperature, enzyme and monomer concentration, on the rate and molecular weight of the polymers is also discussed.  
        关键词：Enzyme catalyzed;Aliphatic polyesters;Synthesis   
        2
        |
        9
        |
        3
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 29983709 false
        发布时间：2022-09-18
      • Jun YE
        Vol. 20, Issue 3, Pages: 67-70(2007) DOI: 10.14028/j.cnki.1003-3726.2007.03.011
        摘要：The importance for developing and strengthening the study on natural polymer has been regarded on the strategy viewpoint of renewable resources utilization. The teaching practice of natural polymer with cultivating and implementing the innovation concept were introduced in this paper. The teaching content should be adjusted to the main line of the structures, properties and their relationship of cellulose, lignin and hemicellulose in order to enhance the essential polymer theories for acceptors and cultivate the qualified science and technology talents. Research teaching model should be adopted in elective to cultivate the self study abilities and innovation concepts of students. Ideal teaching results should be achieved when the student’s interesting in study was raised by adjusting teaching model, the interactive way was conducted, the science criticism spirit was advocated and innovation spirit was trained.  
        关键词：Natural polymer;Teaching adjusting;Essential theory;Research teaching modal;Interactive   
        2
        |
        10
        |
        1
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 29983723 false
        发布时间：2022-09-18
      0