最新刊期
      卷 22 ， 期 11 ， 2009
      • Li-qiong CHEN,Li-ming ZHANG,Jian-jun CHEN,Jian YANG,Rong-xian LI
        Vol. 22, Issue 11, Pages: 1-9(2009) DOI: 10.14028/j.cnki.1003-3726.2009.11.002
        摘要：Block glycopolymer is a new kind of functional materials with good biodegradability and biocompatibility. Moreover, there are many reactive pendant groups such as hydroxy, amino and carboxy groups in its molecular chain which makes it possible to be further modified and obtain new functions. This kind of material can be widely used as thermoplastic elastomers, compatibilizers, surfactants, biodegradable materials and drug delivery. In this paper, the advances in the synthesis of this kind of materials are briefly reviewed, sugars involving oligosaccharide, cellulose, dextran, amylose and hyaluronan, polymerization methods including free radical polymerization, anionic polymerization, cation polymerization, open-ring polymerization, enzymatic polymerization and coupling polymerization.  
        关键词：Sugar;Block polymers;Synthesis   
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        发布时间：2022-09-18
      • Jun QIU,Jie YUAN,Guo-jian WANG
        Vol. 22, Issue 11, Pages: 10-17(2009) DOI: 10.14028/j.cnki.1003-3726.2009.11.009
        摘要：Carbon nanotubes (CNTs)possess excellent mechanical and electrical properties, but the random state of CNTs in their composite materials limits greatly to embody these performance .The approaches to align CNTs in composite materials processing were summarized in this paper .The main approaches including external force, electric field, magnetic field, liquid crystalline phase were introduced and the advantages and disadvantages of these approaches were evaluated .It can be concluded that the carefully designed force field, electric field, magnetic field and liquid crystalline phase enables CNTs to align in polymer composites processing, and thus improve the mechanical and electrical properties of polymer composites but the degree of alignment in all mentioned approaches has to be improved in the future .  
        关键词：Carbon nanotubes;Polymer composites;Alignment;Electric field;Magnetic field   
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        发布时间：2022-09-18
      • Xue JIANG,Yuan-jing QI,He LI,Shu-gen WANG,Xiu-zhi TIAN
        Vol. 22, Issue 11, Pages: 18-27(2009) DOI: 10.14028/j.cnki.1003-3726.2009.11.006
        摘要：Volatile organic compounds (VOCs), e .g ., benzene, toluene, trichloroethylene, chloroform and phenol, in several industrial wastewaters, e .g ., chemistry, pharmacy, eclectron, petroleum, printing, dope and textile, can be effectively removed by a membrane separation techonology named as organophilic pervaporation . Membrane is the core part of an organophilic pervaporation process .And the separation properties of a given membrane used for organophilic pervaporation depend on the inherent separating properties of the membrane material . At present, poly (dimethyl siloxane) (PDMS) is the most widely applied membrane material in organophilic pervaporation .Progress inmodifation of the organic permselective PDMS pervaporative membrane was reviewed in this paper .And its development and prospect were described .  
        关键词：Organic permselective;Pervaporation;Poly(dimethyl siloxane);Membrane;Modification   
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        发布时间：2022-09-18
      • Dong TIAN,Cheng-long XIAO,Zeng-jiang WEI,Ping CHEN,Wei-liang LIU
        Vol. 22, Issue 11, Pages: 28-31(2009) DOI: 10.14028/j.cnki.1003-3726.2009.11.005
        摘要：Recent developments on the application of ionic liquids (ILs) in atom transfer radical polymerization (ATRP) are reviewed. Particular emphasis is placed on the significant effect on the performance of the polymers, including well-controlled process with predictable molecular weight, narrow polydispersity, and well-defined architecture, if the ionic liquids were used as solvent, initiator, ligand or monomer. And a discussion on the opportunities of ionic liquids used in atom transfer radical polymerization for the future concludes this review as well.  
        关键词：Ionic liquids;Atom transfer radical polymerization;Solvent;Monomer;Ligand   
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        发布时间：2022-09-18
      • Bo-wen YAN,Jian HUANG,Genjie JIANG,Hong WU,Shao-yun GUO
        Vol. 22, Issue 11, Pages: 32-36(2009) DOI: 10.14028/j.cnki.1003-3726.2009.11.004
        摘要：The effects of shear on interfacial morphology evolution of over-injection molded polypropylene were investigated in this article. The interfacial morphologies at different distance from the gate under different shear effects, induced by different injection pressure and injection speed, was observed by polarized light microscopy (PLM) and differential scanning calorimetry (DSC) . It was found that injection pressure played more predominant role in the interfacial morphology development than injection speed. The PLM results also showed that less transcrystal was found at the interface due to high injection pressure, indicating that enhanced molecular orientation by increasing injection pressure was unfavorable for the crystallization at the interface during over-injection molding. The interfacial morphology can be controlled by changing injection pressure and injection speed.  
        关键词：Over-Injection molding;Interface;Shear;Morphology development   
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        发布时间：2022-09-18
      • Qiu-ling CHEN,Ru-yan LI,Ke-wei SUN,Chun-hong ZHANG,Jian-chang LI
        Vol. 22, Issue 11, Pages: 37-43(2009) DOI: 10.14028/j.cnki.1003-3726.2009.11.003
        摘要：Using sulfuric acid as catalyst, wheat straw can be liquefied into polyol by polyethylene glycol (PEG400) .In such a process of straw liquefaction, the particle size of straw fiber, the amount of ethylene glycol (EG) and catalyst used, the reaction temperature and time were investigated .The results showed that only 0.8 % of residues remained at the optimum conditions :the size of fiber more than 12 mesh, 20 %of EG, 4 %of concentrated sulfuric acid, and 60 minutes of reaction time at the temperature of 160 ℃.At the same time, hydroxyl value test, acid value test and infrared spectroscopy were used to monitor the conversion process .As opposed to gradually decreasing hydroxyl value, the acid value firstly increased and then decreased, which meant the ester condensation reaction occurred at the final stage of conversion process .This paper also investigated the possibility to produce polyurethane foam using methylene diphenyl diisocyanate(MDI) and polyol derived from wheat straw .By testing, the foam product had a density of 38Kg m3 and a compressive strength of 118KPa, and further confirmed by infrared spectroscopy, it has a characteristic structure of polyurethane .  
        关键词：Wheat straw;Liquefaction;Polyurethane   
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        发布时间：2022-09-18
      • Ying ZHANG,Wei-min LI,Ai-fen LAI
        Vol. 22, Issue 11, Pages: 44-48(2009) DOI: 10.14028/j.cnki.1003-3726.2009.11.008
        摘要：To explore whether the macroporous resin market today is normative, through network and library, we find out the performance parameters of each type of macroporous resin provided by all manufacturers. Comparing these types of resin, which have the same model but produced by different factories, to prove whether the performance parameters are similar; At the same time, through experiment to prove whether these types of resin, which have different models but the performance parameters are similar, are the same. The result is that the actual performance parameters of many different macroporous resin are different from that provided by the manufacturer. The actual performance parameters of the same model from different manufacturers are quite different, while that of different models, but sharing similar performance parameters, are quite alike. Macroporous resin market is a bit confusing.  
        关键词：Macroporous resin;Specification;Model;Normalization   
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        发布时间：2022-09-18
      • Wei BAI,Qing SHEN
        Vol. 22, Issue 11, Pages: 49-56(2009) DOI: 10.14028/j.cnki.1003-3726.2009.11.001
        摘要：This paper reviewed recent progress on the structured emulsion, involving the structure, preparation, performance and application of ordinary emulsion, microemulsion and nanoemulsion. The narrative of emulsions with structured continuous phases contains three aspects, e. g. lyotropic liquid crystal, thermotropic liquid crystals as continuous phases in emulsions and emulsions with a gelled continuous phase were discussed. The application of structured emulsion was introduced by some examples relating to the structured block copolymers in the continuous phase and technologies in preparation of monodispersed emulsion.  
        关键词：Emulsion;Structured;Microemulsion;Nanoemulsion;Preparation;Application   
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        发布时间：2022-09-18
      • Chun-yan LI,Li SHAN,Duan-yan CHU,Jian-hua HUANG,Zhi-guo WEN,Sheng-xiong DONG
        Vol. 22, Issue 11, Pages: 57-61(2009) DOI: 10.14028/j.cnki.1003-3726.2009.11.010
        摘要：The surface of polymer medical material implants adsorbs bacteria to form biofilm lead to biomaterial related infection (BRI) represent a significant challenge to the application of polymer medical material. This paper introduced BRI mechanism, summarized the research of surface modification to reduce bacterial adhesion and antibacterial-biomaterial system. The recent advances of these two methods resistant the occurrence of BRI. Emphasize on local antibacterial sustained-release system and the application of nanotechnology in antibacterial sustained-release system. The research and application of polymer prodrug controlled-release system is the tendency of anti-infective polymer medical material.  
        关键词：Polymer medical material;Anti-infection;Surface modification;Antibacterial sustained-release system;Polymer prodrug controlled-release system   
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        发布时间：2022-09-18
      • Xiao-long WANG,Nai-pu HE,Jiu-si WANG
        Vol. 22, Issue 11, Pages: 62-65(2009) DOI: 10.14028/j.cnki.1003-3726.2009.11.007
        摘要：Polymer chemistry is closely related to organic chemistry. The latter is the foundation for the learning of the former. In the polymer chemistry teaching, it is helpful for students to understand and grasp the related concepts if we use organic chemistry knowledge to explain some concepts of polymers. In this paper, based on teaching practice, several examples of explaining some concepts and reactions in polymer chemistry by using organic chemistry knowledge are reported. Meanwhile, some opinions about the doubtful point in the teaching material are put forward.  
        关键词：Teaching;Polymer chemistry;Organic chemistry;Explaining   
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        发布时间：2022-09-18
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