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Toughening Mechanism and the Application of Epoxy Adhesive Modified by nano-SiO2 X Wang, S.R Zheng, R.M Wang* Department of Application of Chemistry, School of Science, Northwestern Polytechnical University, Xi'an 710072, People’s Republic of China Key words: Nano-SiO2; Epoxy resin; Modified Abstract: Epoxy resin adhesives are widely used in various sectors, particularly in the aerospace and automotive industries.
However, the solidification of the three-dimensional network structure of pure epoxy resin, which causes greater density and brittleness, results in poor system resilience.

Synthesis and antibacterial activity of acylated chitosan Jiang-tao Wanga and Zi-ru Lianb Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao 266100, China ajtwang@ouc.edu.cn; byoyo-lzr@hotmail.com Keywords: Chitosan; Acylated chitosan; High-intensity ultrasound; Antimicrobial activity Abstract.
The structures of the derivatives were characterized by FTIR spectroscopy and elemental analysis.

Construction quality of Cement concrete structure can timely grasp applying the method.
Introduction High strength and high performance concrete committee of Chinese civil engineers society put forward that High performance concrete may be defined as that the kind of concrete is fit to commercial construction and has basic requirements of both durability and sustainable development in Suzhou in May, 2000.Proportion characterization of high performance concrete is low water consumption(dosage of water and bonding material is under 0.4, or is not exceeding 0.45 at the utmost), lower cement content, and the component of the both chemistry admixture and mineral blend is indispensable besides cement, water, sand, and stone by comparison to tradition concrete[1].

Lengauer for allowing us to use his beautiful picture on the front cover of these Proceedings, showing the structure of a Hafnium - Nitrogen diffusion couple ( for more informations seee page 549). 1.
Three ideas have guided us for chosing the topics and the lecturers: - * The control of the microstructures which are obtained after elaborating, transforming or the ageing of a material requires today, beyond the usual empirical approaches, the simultaneous mastering of various fields of Science which have been developped separatly in the past: from quantum mechanics and electronic theory of cohesion, to phenomenological models of spatial and temporal patterning, passing through statistical mechanics, chemistry of compounds, the physics of defects and of matter transport in crystals, elasticity and plasticity.
- * the impressive increase of computer ability and numerical modelling has just allowed us for the last few years to go through all the steps between the electronic structure up to the mesoscopic or macroscopic scale for several particular problems: it becomes now possible to check the macroscopic consequences of the descriptions pertaining to the smaller scales.
The phenomenological models keep their relevance for problems of larger spatial scale, like the formation of dissipative structures.

However, Arindam and Jayaram found that amorphous Al2O3-Y2O3 displayed unusually large plasticity, which they thought to be related to the open structure of the amorphous phase [2,3].
It is clearly that the both of the precursors are amorphous, which may be caused by the formation of three- dimensional network structure through esterification between OH and COOH groups in the citric acid and polymerization between hydroxyl oxygen and metal ions.
The morphology of dried gel prepared with CA/M=1:1 shows porous structure, as shown in fig.2 (a).
[5] C.J.Brinker, G.W.Scherer, Sol-Gel Science-The Physics and Chemistry of Sol-Gel Processing.

As shown in Fig.1, the water miscibility increased with the increasing dosage of A because A has a certain amount of hydrophilic group and the acetal structure is generated during the reaction process which increased the water solubility of UF resin.
The addition of A can improve the structure of urea-formaldehyde resin and enhance the ability of resin to resist water and heat, so that the wet bonding strength of resin could be increased.
Russian Journal of Applied Chemistry.Vol.78(2005), p.685-687 [6] Alaattin.AKtas.
Composite structures.Vol.67(2005), p.495-499

Korea 2 Department of Chemistry, Vellore Institute of Technology, Vellore 632 014, India a cwlee@keri.re.kr, bsathiya_kuna@hotmail.com, csweom@keri.re.kr, e msyun@keri.re.kr Keywords: Zn/Air; Hydrogen evolution reaction; Cyclicvoltammogram; Morphology Abstract.
Chemical structure of succinic acid as an organic additive.
In chemical structure, succinic acid is having a di-carboxylic acid group.
The chemical structure of the used acid as an additive is shown in Fig. 1.

Synthesis and Application of 1-(2-methyl-3-benzothienyl)-2-[3-methyl-2-thienyl]perfluorocyclopentene Gang Li, Gang Liu* and Shouzhi Pu Jiangxi Key Laboratory of Organic Chemistry, Jiangxi Science and Technology Normal University, Nanchang 330013, P.
Introduction Photochromism is the reversible transformation of a chemical species between two forms with different structures by photoirradiation [1-3].
The structure of compound 1o was confirmed by 1H NMR.
The significant difference in absorption bands of the closed-ring isomer compared to its open-ring isomer is mainly due to the increase in π conjugation, which dramatically changes the electronic structure as a whole in such a way that new electronic transitions are observed in the visible region.

Due to the harm of carbon black to atmosphere and health, researches did further experiments and data analysis on how the carbon black formed in the process of diffusive burning and its inhibitory mechanisms in the past decades and they have made some achievements in the fields of flame structures, composition distribution, and carbon black formation[1-6].
We can see that it predicted the structure of diffusive flame quite well by using the model, although there are some errors in the prediction of the rising of flame.
Conclusion The article predicted the flame structure and the temperature distribution in the coaxial diffusive combustion of methane and air by using the 2D num erical model.
Detailed chemistry modeling of laminar diffusion flames on parallel computers, Int.

In recently ten years, people pay attention to PI/inorganic hybrid materials, lots of studies centralize on the PI/SiO2,PI/Al2O3,PI/TiO2 and PI/AlN to study the preparation methods, the performance and the structure of PI/inorganic hybrid materials[5-12].
The structure of the materials was characterized by SEM and FTIR techniques.
Fig.1 SEM micrographs of Si3N4/PI hybrid film As shown in Fig.2, the chemical structures of PI and the Si3N4/PI hybrid films were characterized by IR spectroscopy.
References [1] Y H Zhang, YQ Li and G T Li: Chemistry of Materials, Vol.19(2007):1939 [2] M S Biswas:Adv Polym Sci, Vol.155(2001):167 [3] Y H Zhang, J T Wu and Q.Yan: Polymer, Vol.45(2004):7579 [4] Y H Zhang, Y Li and S Y Fu: Polymer, Vol.46(2005):8373 [5] Y H Zhang, S G Lu and Y Q Li: Advanced Materials, Vol.17 (2005):1056 [6] Y H Zhang, SM Ke, H.Huang, HLW Chan: Applied Physics Letters, 2008, 92:052910