最新刊期
      卷 28 ， 期 1 ， 2015
      • Jian-hua DONG
        Vol. 28, Issue 1, Pages: 1-4(2015) DOI: 10.14028/j.cnki.1003-3726.2015.01.001
        摘要：The guidance for application of NSFC grants in polymer science division for 2015 was released. Progress in few field of polymer science was introduced. It should be emphasized that more polymer scientists received international academic awards recently. The issues and mistakes in proposals to NSFC were analyzed.  
        关键词：Guidance for NSFC grants;Progress in polymer science   
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        发布时间：2022-09-18
      • Zi-qiao HU,Gang WANG,Guang-ming CHEN,Xin WANG
        Vol. 28, Issue 1, Pages: 5-12(2015) DOI: 10.14028/j.cnki.1003-3726.2015.01.002
        摘要：The application of conventional chemically crosslinking polyacrylamide (PAM) hydrogels is seriously limited due to their poor mechanical properties. Novel PAM nanocomposite (NC) hydrogels exhibit greatly enhanced mechanical performances as well as the swelling ratios. In this review, two different NC hydrogels series, including via physical crosslinking and chemical crosslinking, were classified. The recent developments of the mechanical properties of these two types of PAM NC hydrogels were reviewed in details. In addition, other properties such as swelling ratios were discussed as well.  
        关键词：Polyacrylamide;Nanocomposite;Hydrogel;Mechanical property;Swelling ratio   
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        发布时间：2022-09-18
      • Li-hui DENG,Cong-jie CHEN,Qi-lin WU
        Vol. 28, Issue 1, Pages: 13-18(2015) DOI: 10.14028/j.cnki.1003-3726.2015.01.003
        摘要：The interface plays a particularly important role in fiber-reinforced composite materials. The interface region with a few nanometers to tens of microns is the weak area in the composite materials and seriously affects the mechanical properties. The mechanisms of the interfacial stress transfer and the interfacial debonding can be investigated by micro-scale experimental mechanical methods which explore the relationships among microstructure, interfacial micromechanics and macroscopic fracture. As a preferred method, micro-Raman spectroscopy has been applied to study the interfacial micromechanics and the fiber bridging technique is also introduced in detail. The bridging stress, the crack propagation and the interfacial stress transfer are mainly discussed and the micromechanics of crack/bridging fiber is finally summarized.  
        关键词：Interfacial micromechanics;Micro-Raman spectroscopy;Bridging fibers   
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        发布时间：2022-09-18
      • Jiang-dong YU,Qiu-ling CHEN,Sheng SUN,Qing-qing GUAN,Ping NING,Jun-jie GU
        Vol. 28, Issue 1, Pages: 19-24(2015) DOI: 10.14028/j.cnki.1003-3726.2015.01.004
        摘要：No needing energy to dry raw material, hydrogen production from wet biomass gasification in supercritical water is considered to be one of the most promising technologies. In recent years, domestic and foreign scholars have done a lot for this technology, especially for the transition metal catalysts. The influence of different metals, different supported materials and metals loading on the results of gasification is reviewed. The activity and stability of promoters modified transition metals for hydrogen generation by supercritical water gasification of biomass has been discussed. Performance of catalysts would be poisoned by a small amount of sulfur, chloride anions and nitrogen in the feeds. It is necessary to strengthen the research on the stability of supported materials. In addition, should give significant attention to the novel preparation methods of catalysts, such as supercritical fluid deposition technique.  
        关键词：Biomass;Supercritical water;Gasification;Catalyst;Hydrogen   
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        发布时间：2022-09-18
      • Hai-hong MA,Li SUN,Xue-mei WU,Zheng-fa ZHOU,Wei-bing XU,Feng-mei REN
        Vol. 28, Issue 1, Pages: 25-31(2015) DOI: 10.14028/j.cnki.1003-3726.2015.01.005
        摘要：One method of reducing nutrient losses and hazardous effects to the environment resulted from the overuse of conventional fertilizers involves the use of slow/controlled release fertilizers. As a kind of slow/controlled release fertilizers, polymer coated slow/controlled release fertilizer is important. The environmental factors, coating thickness and processing technique, which affect the release performance of polymer coated slow release fertilizers, have been studied deeply. While structural factors, which also have a substantial influence on the release performance, were studied less previously. The article systematically discussed the structural factors on release performance of polymer coated slow release fertilizers, including crystalline properties, hydrophobic/hydrophilic character, flexibility of macromolecular chains, crosslinking behavior and so on. The deep research of structural factors is benefit for the slection of coating materials and can provide theoretical basis for development and production of polymer coated slow/controlled release fertilizers.  
        关键词：Slow/controlled release fertilizers;Structural factors;Crystalline properties;Hydrophobic/hydrophilic;Flexibility;Crosslinking   
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        发布时间：2022-09-18
      • Shuang-qiao YANG,Shi-bing BAI,Qi WANG
        Vol. 28, Issue 1, Pages: 32-37(2015) DOI: 10.14028/j.cnki.1003-3726.2015.01.006
        摘要：In this article, pan milled wasted printed circuit boards (WPCB) powder and polypropylene (PP)/Waste Printed Circuit Boards (WPCB) composite with high performance were prepared by Solid State Shear Milling (S3M). The particles size and distribution of WPCB powder, dispersion, rheology and mechanical properties of the composite were further investigated. The results showed that the average particle size and surface area of WPCB powder dropped from 282.4um to 63.5um and 0.06m2/g to 0.14m2/g respectively. Meanwhile,the particles size distribution become narrow and the epoxy resin exfoliated from fiberglass obviously. After pan milled the dispersion of WPCB and the processibility of composite is significantly improved. The mechanical test result showed that the mechanical properties of PP/WPCB composites which prepared by S3M was superior to pure PP. The maximum increment of tensile strength, flexural modulus and the heated-distortion temperature is 14.6%, 82.5% respectively. The composite obtained has a good surface color, low cost and a very broad prospect for industrialization.  
        关键词：Pan milling;Recycle;Wasted polypropylene;Wasted printed circuit boards   
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        发布时间：2022-09-18
      • Ying LI,Zhong-chun PENG,Qian LI,Hua-yi LI,Shui-rong ZHENG
        Vol. 28, Issue 1, Pages: 38-43(2015) DOI: 10.14028/j.cnki.1003-3726.2015.01.007
        摘要：The molecule structure of polyvinyl butyral contains large part of OH group, which could be uesed to modify the nonpolartiy of polypropylene. Different structures of polyvinyl butyral (PVB: B-98, B-76 and B-72) were selected to modification impact polypropylene (ICPP) by melt blending method (PVB/ICPP: 5/95). The blend system of PVB/ICPP was studied by SEM, POM, DSC and mechanical properties test. The SEM result confirms that PVB shows party miscibility with ICPP, in which B-98 is the best. The results from POM and DSC show that PVB has a remarkable inhibitory effect on the crystallization rate of ICPP; The results from mechanical tests indicate that the comprehensive mechanical properties of B-98/ICPP are better than B-76/ICPP and B-72/ICPP. The better miscibility of PVB of B-86 with polypropylene is mainly due to its small molecular weight.  
        关键词：Polypropylene;Polyvinyl butyral;Blending;Compatibility   
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        发布时间：2022-09-18
      • Yan-xia CAO,Meng-meng CUI,Di LI,Wan-jie WANG,Jing-wu WANG
        Vol. 28, Issue 1, Pages: 44-49(2015) DOI: 10.14028/j.cnki.1003-3726.2015.01.008
        摘要：The surface modification of fumed SiO2was carried out by grafting KH560. The bulk density, surface structure and morphology of modified and unmodified SiO2 was characterized. The recycled PVB/SiO2 composites were prepared by using of melt blending. The mechanical properties, morphology and dynamical rheological behavior of the composites were compared. The result showed that KH560 was grafted on the modified SiO2 and the bulk density of modified SiO2 increased obviously compared with the unmodified SiO2. The adhesive force of the recycled PVB/modified SiO2 composites remarkably decreased in melt processing. The tensile properties of the recycled PVB/SiO2 composites slightly decreased while the tear strength slightly increased compared with the recycled PVB.  
        关键词：Recycled polyvinyl butyral;SiO2;Surface modification;Melt blending;Composites   
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        发布时间：2022-09-18
      • Zhen ZHANG,Ting-wei WANG,Chao DI
        Vol. 28, Issue 1, Pages: 50-55(2015) DOI: 10.14028/j.cnki.1003-3726.2015.01.009
        摘要：1,3-bis[3-(1-methoxy-2-hydroxypropoxy)propyl]polysiloxane was prepared by the equilibrium copolymerization of octamethyl cyclotetrasiloxane(D4) and 1,3-bis[3-(1-methoxy-2-hydroxypropoxy)propyl]tetramethyldisiloxane. The effects of reaction temperature, reaction time, catalyst type and amount of the catalyst on the reaction had been researched. The results suggest that the optimal synthesis conditions were that the reaction was carried out at 65℃ for 24 hours using concentrated sulfuric acid at a mass fraction of 0.3% of the reaction substance as catalyst.And then the reaction has the highest conversion rate. The product was characterized by FTIR and 1H NMR.  
        关键词：1, 3-Bis[3-(1-methoxy-2-hydroxypropoxy)propyl]tetramethyldisiloxane;Octamethyl cyclotetrasiloxane;Ring-opening polymerization;Intrinsic viscosity;Conversion rate   
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        发布时间：2022-09-18
      • Wei-hong LI,Peng SI,Wen LEI
        Vol. 28, Issue 1, Pages: 56-59(2015) DOI: 10.14028/j.cnki.1003-3726.2015.01.010
        摘要：When sustained and controlled drug-release materials are applied, the drug can be long-term released stably, and the disease can be treated more effectively by the drug. Polymer materials are one important kind of the sustained and controlled drug-release materials, which can be classified into two categories, i.e, natural ones and synthesized ones, among which, natural ones used as sustained and controlled drug-release materials have been studied for many years and well recognized by people. Thus the research development of synthetic polymer materials used as sustained and controlled drug-release systems are only reviewed in this paper, the preparation method, drug release mechanism and applicative drugs of these polymer materials are introduced, aiming at providing basis for the synthesis and enlarging the application areas of these materials.  
        关键词：Polymer material;Sustained release system;Controlled-release system;Drug   
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        发布时间：2022-09-18
      • Li CHEN,Ji-chuan HUO,Hai-bin WANG,Lin LI
        Vol. 28, Issue 1, Pages: 60-66(2015) DOI: 10.14028/j.cnki.1003-3726.2015.01.011
        摘要：Carbon fiber as a kind of high performance fibers is the most important reinforced material of advanced composites. The main factor to determine the performance of carbon fiber is its microstructure. Characterization techniques of the microstructure of carbon fibers, such as surface topography, morphological structure, chemical structure, crystalline structure and pore structure are summarized. Surface morphology of carbon fiber is characterized by scanning electron microscope (SEM) and atomic force microscope (AFM). The morphological structure of carbon fiber is investigated by means of transmission electron microscope (TEM). Characterization methods on chemical structure include Raman spectrum and X-ray Photoelectron spectroscopy. Wide angle X-ray diffraction (WXRD) and Small angle X-ray scattering (SAXS) are respectively used to analyze crystalline structure and pore structure. It can be provided reference for obtaining high performance carbon fiber.  
        关键词：Carbon fiber;Microstructure;Characterization   
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        发布时间：2022-09-18
      • Qi-ye WU
        Vol. 28, Issue 1, Pages: 67-72(2015) DOI: 10.14028/j.cnki.1003-3726.2015.01.012
        摘要：In this work the features of Brownian movement of macromolecules were introduced. The fundamentality of Brownian movement in modern polymer physics was discussed from the relationship between Brownian movement and flexibility of polymer chain; from the competition of macromolecular motions with the macromolecular interactions, and from the relationship between macromolecular motions and the entropy induced phase transition as examples. It is indicated, that the researches into Brownian movement have very important meanings for understanding the features of polymer structures and polymer performances.  
        关键词：Brownian movement;Macromolecular movement;Polymer physics   
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        发布时间：2022-09-18
      • Yi-xin LIU,Hong-dong ZHANG
        Vol. 28, Issue 1, Pages: 73-79(2015) DOI: 10.14028/j.cnki.1003-3726.2015.01.013
        摘要：Ginzburg criterion is an important tool for determination of the validity of the mean-field theory. In this paper we start from solving an interesting problem on the Ginzburg criterion of symmetric two-component polymer blends presented in Polymer Physics, the textbook written by M. Rubinstein and R. H. Colby. A general strategy to construct the Ginzburg criterion for polymer blends and polymer solutions is summarized. The strategy is then applied to the asymmetric two-component polymer blends and polymer solutions.  
        关键词：Mean-Field theory;Polymer blends;Polymer solution;Fluctuation;Critical point   
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        发布时间：2022-09-18
      • Jun-hua LIU,Jun LING
        Vol. 28, Issue 1, Pages: 80-83(2015) DOI: 10.14028/j.cnki.1003-3726.2015.01.014
        摘要：In the ring-opening polymerization chapter of the course Polymer Chemisty, students are told that ring strain is a driving force and an important thermodynamic parameter to determine whether a cyclic monomer can be polymerized or not. However, it is not always the truth. Some textbooks use two cis-and trans-isomers as examples, which are cis- and trans-8-oxabicyclo[4.3.0]-nonane (I) and cis- and trans-7,9-dioxabicyclo[4.3.0]-nonane (II), and consider ring-strain as the only reason why trans-isomer is easier than the corresponding cis-one in both cases. In this work, we calculate the changes of Gibbs free energy of two ring-opening reactions with density functional theory (DFT). The Gibbs energies of cis-and trans-isomers I are very close to each other without difference in ring strain. Instead, the product of trans-isomer after ring opening reaction is more stable than that of cis-isomer by 1.81kcal/mol of ΔG. In contrary, the ring of trans-II is easier to be opened than that of cis-II because of higher ring strain by 3.00kcal/mol of ΔG. The above two different mechanisms are to be explained in class. DFT calculation are to be introduced as well.  
        关键词：Ring-opening polymerization;Ring-strain of cyclic monomer;Thermodynamic parameter;Density functional theory   
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        发布时间：2022-09-18
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