最新刊期
      卷 20 ， 期 10 ， 2007
      • Xiao-Bin WANG,Peng YE,Xin-Ping WANG
        Vol. 20, Issue 10, Pages: 1-7(2007) DOI: 10.14028/j.cnki.1003-3726.2007.10.001
        摘要：This article reviews the recent progresses on the surface properties of end-functionalized polymers.The end-functionalization of polymer was a robust method to modify polymer surface.The kinds and the number of functional groups on the polymer surface can be precisely controlled by this method, which result in affecting the chemical structure and properties of polymer surface.The segregation phenomenon of end-functionalized groups of the polymer was discussed.Some analysis techniques such as SFG, NR and SSIMS, employed to characterize the surface of end-functionalized polymerwere introduced.Surface reconstruction of end-functionalized polymers and the effect of end groups on the molecular movability on the polymer surface were discussed.It is pointed out that the polymer surface with desirable surface energy could be effectively achieved by changing the end groups of polymer.Forecast about application of end-functionalized polymer was presented.  
        关键词：Surface modification;Polymer surface;End-functional group;Surface property   
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        发布时间：2022-09-18
      • Wei-li WANG,Qi YANG,Ya-jie SUN,Jun-jie KUANG
        Vol. 20, Issue 10, Pages: 8-14(2007) DOI: 10.14028/j.cnki.1003-3726.2007.10.002
        摘要：In recent years, because of the extensive application of polymer blends filled with particles, the research of the structure of polymer composites is important. In addition to studying the dispersion of particles in polymeric matrix, many works focused on the effect of fillers on the phase separation in polymer blends. The results show that the size, the surface treatment and the content of particles influence the thermodynamics and dynamics of phase separation in polymer blends. However, some factors lead to the complexity of phase behavior of the polymer blend-fillers system, such as the selective adsorption of particles, the wetting of polymer components on particles and the retardance of phase domains by particles. This paper will review the foundation theories and experiment results of phase separation in polymer blend-fillers system, introduce the influencing factors of phase separation, and prospect the research trend and foreground of this realm.  
        关键词：Polymer blends;Fillers;Phase separation;Compatibilization;Wetting   
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        发布时间：2022-09-18
      • Dan CAO,Lin-Bo WU,Bo-Geng LI,Yuan HUANG
        Vol. 20, Issue 10, Pages: 15-20(2007) DOI: 10.14028/j.cnki.1003-3726.2007.10.008
        摘要：Polylactic acid is one of most important and promising biodegradable and bioabsorbable materials. It has been widely applied as biodegradable plastics and fibers as well as biomaterials, and therefore, is of tremendous market value. Polylactic acid has polyolefins-comparative mechanical and processing properties but unsatisfactory heat and impact resistance. Its thermal, mechanical and gas barrier properties need to be enhanced to satisfy various applications. Preparation of nanocomposites of polylactic acid with inorganic nanoparticles is an effective approach to remarkably improve the properties. The progress in the preparation, structure and properties of polylactic acid-based nanocomposites as well as the relationships among them are reviewed, and the prospect of this field is discussed.  
        关键词：Polylactic acid;Nanocomposites;MMT;Silicon dioxide;Carbon nanotube;Hydroxyapatite   
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        发布时间：2022-09-18
      • Liang WANG,Hong CHEN,Wei SONG,Zhong-kui WU,Yi-feng WANG
        Vol. 20, Issue 10, Pages: 21-25(2007) DOI: 10.14028/j.cnki.1003-3726.2007.10.009
        摘要：Biocompatibility of biomaterial surface draws many people' s attention in the biomaterials research field.This paper summarized recent progress in surface modification of silicone elastomer to create a biocompatible biomaterial surface.Chemical modification methods including bulk grafting, plasma treatment, photochemistry grafting, ozone-activated grafting as well as hydrosilylation and atom transfer radical polymerization were introduced. Nonspecific protein- and platelet- resistant properties of modified silicone elastomer surface were viewed, and the further research direction of silicone elastomer surface modification was also suggested.  
        关键词：Silicone elastomer;Poly(dimethylsiloxane)elastomer;Biocompatibility;Modification method   
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        发布时间：2022-09-18
      • Yan JIANG,Man CHEN,Ming CHEN,Hai-yue ZHANG,Fang-lian YAO,Kang-de YAO
        Vol. 20, Issue 10, Pages: 26-33(2007) DOI: 10.14028/j.cnki.1003-3726.2007.10.010
        摘要：Hydrogels, three-dimensional networks of hydrophilic polymers that are able to swell large amounts of water, can be made to resemble the physical characteristics of soft tissues. Photocrosslinkable hydrogels are being investigated for a number of medical applications because of fast curing rates, spatial and temporal control and minimal heat production. This review presents advantages of photocrosslinkable hydrogels and summarizes their applications in drug delivery system, tissue engineering scaffold, cell controlled release, cell encapsulation and injectable hydrogels. All these studies indicate that photocrosslinkable hydrogels could be better employed in the tissue engineering and regeneration medical field.  
        关键词：Hydrogels;Photocrosslink;Tissue engineering;Drug delivery system;Cell encapsulation   
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        发布时间：2022-09-18
      • Yan ZHANG,Fang-ke SHAO,Wei WU,Wu-li YANG,Shou-kuan FU
        Vol. 20, Issue 10, Pages: 34-40(2007) DOI: 10.14028/j.cnki.1003-3726.2007.10.011
        摘要：Poly (ethylene oxide) -poly (propylene oxide) -poly (ethylene oxide) triblock copolymers have been investigated widely due to their excellent biological compatibility and protein-resistant properties in applications as biomedical materials. Temperature-dependent micellization and thermo-reversible gelation are two of the most characteristic properties of aqueous PEO-PPO-PEO block copolymer solutions. PEO-PPO-PEO is found to be a drug delivery system with multiple effects. The incorporation of drug into the core of the micelles formed by PEO-PPO-PEO results in increased solubility, metabolic stability and circulation time for the drug. This Paper described the use of such copolymers for drug delivery system and tissue engineering in some detail.  
        关键词：PEO-PPO-PEO;Biomedical materials;Drug delivery system;Tissue engineering   
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        发布时间：2022-09-18
      • He-chun CHENG,Dong-liang CHENG,Qing LI,Li-fang ZHANG,Liang XU,Zuo-chun XIONG,Cheng-dong XIONG
        Vol. 20, Issue 10, Pages: 41-46(2007) DOI: 10.14028/j.cnki.1003-3726.2007.10.003
        摘要：In this study, in order to improve the flexibility of poly (DL-lactide) (PDLLA), a high molecular weight poly(dioxanone) (PPDO) with great flexibility was added in PDLLA matrix with different weight ratios.Hybrids were characterized in terms of phase structure (scanning electron microscopy), thermal properties(differential canning calorimetry and dynamic mechanical analysis), mechanical properties(tensile analysis), surface properties(dynamic contact angle analysis) and degradability.As a result of the PPDO appended in, the flexibility of the PDLLA was significantly improved as well as the degradation speed of the blends.  
        关键词：Poly (DL-lactide);Polydioxanone;Blend;Fexibility   
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        发布时间：2022-09-18
      • Hua QIU,Shu-hua QI,Jin WANG
        Vol. 20, Issue 10, Pages: 47-51(2007) DOI: 10.14028/j.cnki.1003-3726.2007.10.004
        摘要：This paper reviews the synthesis and procedure of sucrose esters, also presents its reaction mechanism. There are mainly four ways to synthesize sucrose esters: solvent method, emulsification method, homogeneous non-solvent method and enzyme catalyst method. Solvent method uses DMF or DMSO which is poisonous as solvent. That restricts applications of sucrose esters in food industry. Emulsification method involves propylene glycol or water instead of DMF or DMSO, and adding emulsifying agents makes the reaction system similar to be homogenous. In non-solvent method, emulsifying agents or effective catalysts are added to reaction system which makes the melting reactants homogenous, while temperature of the reaction usually is too high to operate, and the quality of product is always low. Enzyme catalyst method using enzymes as catalyst is a new biological synthesis method with high selectivity, easy production separation, and moderated condition etc. And sucrose esters purification is also summarized.  
        关键词：Sucrose esters;Sucrose polyesters;Synthesis;Reaction Mechanism   
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        发布时间：2022-09-18
      • Jian ZHANG,Hai-yan CHEN,Yue-qing GU
        Vol. 20, Issue 10, Pages: 52-56(2007) DOI: 10.14028/j.cnki.1003-3726.2007.10.005
        摘要：In this article, the properties and the responsive mechanism of PNIPA nano-hydrogels were briefly introduced. And then more emphasis was placed on the application of PNIPA nano-hydrogels as drug carriers for controlled and sustained drug release. They provide liposoluble drugs with stability, solubility, bioactivity. And hydrosoluble drugs entrapped in PNIPA nano-hydrogels can be sustainedly released. They can also be used as carriers for biomacromolecule drugs to avoid disadvantage in application. PNIPA nano-hydrogels are also favourable gene engineering carriers.  
        关键词：PNIPA;Nano-hydrogel;Thermosensitive;Sustained release;Controlled release   
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        发布时间：2022-09-18
      • Qian SHAO,Cheng-guo WANG,Heng ZHENG,Jian-ming WANG
        Vol. 20, Issue 10, Pages: 57-61(2007) DOI: 10.14028/j.cnki.1003-3726.2007.10.006
        摘要：The seeded emulsion polymerization plays an important role in particle design and functional latex preparation because of the stability of latex, narrow distribution of latex particle size, easy to control and so on. It is the most simple and convenient method of preparing high solid content and core shell structure latex. The research progress in its techniques, mechanism such as grafting mechanism, interpenetrating polymer network mechanism, polymer deposition mechanism, seed surface polymerization mechanism and electrovalent bond mechanism etc., and the applications in particle design of seeded emulsion polymerization are reviewed. The effects of various factors on seeded emulsion polymerization are discussed especially.  
        关键词：Seed latex;Emulsion polymerization;Particle design   
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        发布时间：2022-09-18
      • Xiao-yun ZHANG
        Vol. 20, Issue 10, Pages: 62-64(2007) DOI: 10.14028/j.cnki.1003-3726.2007.10.007
        摘要：How to enhance the effect of experiment course of polymer chemistry is discussed with the example of polymerization of acrylamide solution in water.Researching experiment, Which means every student finishes the same experiment with the different conditions and collects the results and discussed them, is developed to substitute validating experiment.Experiment phenomena are connected with industry producing process and following course so that the experiment content is enriched.Good result is achieved through developing researching experiment and enriching the experiment content, which can stir up the students' enthusiasm and tap their potentialities.  
        关键词：Experiment of polymer chemistry;Researching experiment;Enriching content   
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        发布时间：2022-09-18
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