最新刊期
      卷 17 ， 期 3 ， 2004
      • Han ZHU,Yi-xian WU,Xu XU,Guan-ying WU
        Vol. 17, Issue 3, Pages: 1-7,13(2004) DOI: 10.14028/j.cnki.1003-3726.2004.03.001
        摘要：The mechanistic roles of nucleophiles in living carbocationic polymerization of isobutylene were reviewed.There are4mechanisms: A.The "carbocation stabilization" -nucleophiles and/or their complexes with Lewis acid interact with the growing chain end to reduce its "cationicity" and the reduction in cationicity to decrease the polymerization rate, suppress chain transfer and termination reactions; B.The "proton-scavenging" - the removal of protic impurities by externally added nucleophiles and the elimination of "induced" chain transfer; C.The "apparent stabilization of the growing chain ends" - the reduction in the instantaneous carbocation concentration; D.The "suppression of free ions" - the common ions in situ production via the scavenging of protic impurities.  
        关键词：Cationic polymerization;Nucleophiles;Living polymerization;Isobutylene   
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        发布时间：2022-09-18
      • Fang-lian YAO,Yu-tao ZHOU,Wei CHEN,Xiao-yan AN,Ji-hong MENG,Kang-de YAO
        Vol. 17, Issue 3, Pages: 8-13(2004) DOI: 10.14028/j.cnki.1003-3726.2004.03.002
        摘要：This paper reviewed the application of the natural-synthetic polymeric biological hybrid material in the biomedical field, its unique properties as the matrix of the tissue engineering and the medicament carrier were analyzed, and pointed out that biological hybrid material is the tendency of the development of the biomedical material.  
        关键词：Natural polymer;Synthetic polymer;Hybrid;Biomedical   
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        发布时间：2022-09-18
      • Nai-pu HE,Peng-fei SONG,Rong-min WANG,Hui ZHANG,Yun-pu WANG
        Vol. 17, Issue 3, Pages: 14-18(2004) DOI: 10.14028/j.cnki.1003-3726.2004.03.003
        摘要：In this review, it is focus on the development of study on antibacterial and antitumor activities of chitin/chitosan and their derivatives.  
        关键词：Chitin/chitosan;Antibacterial activity;Antitumor activity;Development   
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        发布时间：2022-09-18
      • Su-ning ZHANG,Tao CHEN,Jia-ping LIN,Shao-liang LIN,Chang-sheng LIU,Dong-mei TANG,Xiao-hui TIAN
        Vol. 17, Issue 3, Pages: 19-28,48(2004) DOI: 10.14028/j.cnki.1003-3726.2004.03.004
        摘要：Polypeptide is a kind of polymer synthesized by amino acid and their derivates.Due to their unique structures and properties, synthetic polypeptides recently have been studied widely in the field of protein simulation, macromolecular conformational study and biomedicine.This paper mainly reviews the research and application statues of polypeptides in synthesis, molecular conformational study, liquid crystal phase behavior, self-assembly behavior and drug delivery system.The developing tendency of polypeptides in tissue engineering is also discussed.  
        关键词：Polypeptide;Structures and properties;Biomaterial   
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        发布时间：2022-09-18
      • Xiang-yang TANG,Jiu-gao YU,Yan-jun WANG
        Vol. 17, Issue 3, Pages: 29-37(2004) DOI: 10.14028/j.cnki.1003-3726.2004.03.005
        摘要：The investigation development for the mechanism of reversible addition-fragmentation chain transfer (RAFT) polymerization, the synthesis methods of RAFT agents and the reactive kinetics of RAFT polymerization were reviewed, respectively.  
        关键词：Reversible addition-fragmentation chain transfer;Living radical polymerization;Dithioester   
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        发布时间：2022-09-18
      • Kai ZHANG,Yu-hong HUANG,De-hui ZHOU,Qiang FU,Lu-xia JIANG
        Vol. 17, Issue 3, Pages: 38-42(2004) DOI: 10.14028/j.cnki.1003-3726.2004.03.006
        摘要：As a kind of novel composite material, organic-inorganic composite particles own many advantages and unique properties of organic and inorganic matter.They have been applied in some fields such as bioengineering, medicine, chemistry industry, electronic and military applications.In this paper, preparation ways, preparation mechanisms and advances of preparation technology on organic-inorganic composite particles were reviewed.  
        关键词：Organic-inorganic composite particles;Mechanisms;Preparation technology   
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        发布时间：2022-09-18
      • Zhao-quan AI,Qi-long ZHOU,Hong-tao ZHANG
        Vol. 17, Issue 3, Pages: 43-48(2004) DOI: 10.14028/j.cnki.1003-3726.2004.03.007
        摘要：High-solid content is always an aim of emulsion polymerization. This paper classified the approaches of preparing high-solid content latex to three kinds according to the mechanisms, i. e. controlling the particle size distribution (PSD) , amplifying the particle size, and deforming the particles, and reviewed the progress in preparation of high-solid content latex. Also, some prospect was given.  
        关键词：High-solid content;Latex;Preparation;Progress   
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        发布时间：2022-09-18
      • Xin-rong TENG,Jie REN
        Vol. 17, Issue 3, Pages: 49-57(2004) DOI: 10.14028/j.cnki.1003-3726.2004.03.008
        摘要：Using supercritical carbon dioxide as solvent, the developments of research and the application of surfactant in dispersion and emulsion polymerizations are summarized.The structure, mechanism and application of several surfactants are introduced in detail.And it indicates that the surfactant plays an important role and has potential applications in such polymerizations using supercritical carbon dioxide.  
        关键词：Surfactant;Supercritical carbon dioxide;Polymerization   
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        发布时间：2022-09-18
      • Hong HUO,Hong-fei LI,Yan-feng MENG,Shi-chun JIANG,Li-jia AN
        Vol. 17, Issue 3, Pages: 58-66,83(2004) DOI: 10.14028/j.cnki.1003-3726.2004.03.009
        摘要：Isotatic polypropylene (i-PP) is a polymorphic material with several known crystal modifications , such as monoclinic (α) , hexagonal (β) and triclinic (γ).Of these polymorphs, theαform is the thermodynamically stable crystalline modification and is predominant under common processing conditions.But iPP may form theβ-phase under shear conditions.By tensile and shear loads, polymeric molecules are stretched and oriented into rows in the molten state, the row nucleus transform into cylindrites or fibril crystallites.The effect of shear on crystallization kinetics is characterized in the following aspects: shear accelerates the crystalline growth rate, decreases the induction time and increases the activated nuclei density.The effect of flow on the kinetics can be understood by considering that the increase of the degree of order due to flow results in an effective change of the melt energy.On the basis of this concept, several empirical approaches have been proposed, but these models have some limits.  
        关键词：iPP;Shear;Crystallization morphology;Crystalline modification;Crystallization kinetics   
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        发布时间：2022-09-18
      • Ping-ping WANG,Guo-hua CHEN,Da-jun WU,Jin-rui XU
        Vol. 17, Issue 3, Pages: 67-75(2004) DOI: 10.14028/j.cnki.1003-3726.2004.03.010
        摘要：A review on the development of light emitting diodes is performed on 42 references.The application of novel conjugated polymer nanocomposite in LED is illustrated.Structure design on nanocomposite to improve the optical-electronic properties and stability is discussed.  
        关键词：Conjugated polymer;Nanocomposite;light emitting diodes   
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        发布时间：2022-09-18
      • Qing-guo XU,Xu-bo YUAN,Jin CHANG
        Vol. 17, Issue 3, Pages: 76-83(2004) DOI: 10.14028/j.cnki.1003-3726.2004.03.011
        摘要：Cholesterol and bile acids extensively exist in nature, and they are biocompatible.Polymers are hydrophobized with cholesterol and bile acids to get amphiphilic polymers, which have potentials to self-assemble into polymeric micelles.The objective of this review is to summarize the recent advances in unveiling selfassembly behavior of the amphiphilic polymers containing cholesterol or bile acids and their applications in drug delivery systems.  
        关键词：Cholesterol;Bile acids;Amphiphilic polymer;Polymeric micelles;Drug delivery systems   
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        发布时间：2022-09-18
      • Song SONG,Wen-ping CHEN,Mei-fang ZHU,Yan-mo CHEN,Yu ZHANG
        Vol. 17, Issue 3, Pages: 84-88(2004) DOI: 10.14028/j.cnki.1003-3726.2004.03.012
        摘要：Study on the effect of different initiators on the structure of PMMA/P (AN-MMA) nano composite particles.Three types of initiators, potassium persulfate (KPS) , azobisiobutyrinitrile (AIBN) and textbutyl hydroperoxide (C4H10O2) /FeSO4 were used in the second-stage polymerization, the results showed that the morphology structure of PMMA/P (AN-MMA) nano composite particles by seeded emulsion polymerization, at the thermodynamics equilibrium condition, was hemisphere structure in line with the thermodynamics analysis.  
        关键词：Nano latex;Nano composite particles;Seeded emulsion polymerization;Morphology structure   
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        发布时间：2022-09-18
      • Xiao-jin ZHANG,Xu-bo YUAN,Yun-xia HU,Jin CHANG,Chun-sheng KANG,Pei-yu PU
        Vol. 17, Issue 3, Pages: 89-92,98(2004) DOI: 10.14028/j.cnki.1003-3726.2004.03.013
        摘要：O-CMC Magnetic nanoparticles were prepared by a method of co-precipitation with O-CMC matrix.The MTX was linked to the O-CMC Magnetic nanoparticles with EDC method.The nanoparticlces with average diameters of 50nm were obtained and characterized by TEM, AFM and VSM.Meanwhile, more than 95% of O-CMC nanoparticles accumulated under the1T external magnet field in a model of simulated blood circulation in human capillary vessels.The cytotoxicity of MTX loaded O-CMC magnetic narloparticles was investigated with U-937 tumor cells.The results showed that the MTX loaded O-CMC magnetic nanoparticles remained the significant antitumor toxicity and sustained release of MTX from O-CMC nanoparticles was observed in vitro.  
        关键词：O-Carboxymethylated chitosan;MTX;Drug delivery system;Magnetic nanoparticles;Cancer therapy   
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        发布时间：2022-09-18
      • Xin HOU,Zhe-guo ZHANG,Nan CHENG
        Vol. 17, Issue 3, Pages: 93-98(2004) DOI: 10.14028/j.cnki.1003-3726.2004.03.014
        摘要：Sucrose is a kind of diose and is ubiquitously present in the nature.As it is an inexpensive organic chemical with extremely high purity, the potential of sucrose as a raw material in various chemical and biological products has been explored extensively.The recent developments in the research of sucrose-based polymers were reviewed in this paper.Application and Preparation of different sucrose-based polymers have been introduced.  
        关键词：Sucrose;Polysucrose;Sucrose hydrogel;Polysucrose ester   
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        发布时间：2022-09-18
      • Wei-min ZHANG,Guo-ping REN,Sheng-yi QIN
        Vol. 17, Issue 3, Pages: 99-105(2004) DOI: 10.14028/j.cnki.1003-3726.2004.03.015
        摘要：The present situation and the recent progress of novolak type phenolic resin coated sand used for shell moulding were reviewed, including raw material, mixing method, reclaimed resin coated sand and theoretic progress.The developing tendency was also discussed in this paper.  
        关键词：Resin coated sand;Novolak type phenolic resin;Reclaimed resin coated sand;Progress   
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        发布时间：2022-09-18
      • Cong-ming XIAO
        Vol. 17, Issue 3, Pages: 106-108,88(2004) DOI: 10.14028/j.cnki.1003-3726.2004.03.016
        摘要：A novel and effective way to lecture and learn the course of "polymer physics" is presented. Interactive questions and answers are designed interdependently.Thus, the course is organized as a network and the details can be easily associated with set questions.With the interactive way, students can understand thoroughly and do not need to memorize mechanically.  
        关键词：Polymer physics;Interactive lecturing and learning way;Understand thoroughly   
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        发布时间：2022-09-18
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