Search results

Reaction Mechanism on the Modification of PLA by melamine via DMP Qunfang Wanga, Jinfeng Xiongb, Mingli Zhongc and Zhaoyang Wang*d School of Chemistry and Environment, South China Normal University, Guangzhou, Guangdong, 510006, China awang3525@126.com, bxiaoxiong880105@yahoo.cn, c492046196@qq.com, dwangwangzhaoyang@tom.com Keywords: Biodegradable material, Melamine, Star-shaped Poly(lactic acid) (SPLA), Direct Melt Polycondensation (DMP), Reaction Mechanism, Aromatic Core.
Increasing the molar feed ratio n(LA)/n(MA), the structure of the copolymers is gradually changed from multi-core structure into SPLA structure only containing one MA core, and a peak value of Mw exists as expected.
This may be related to the formation of the copolymer with multi-core structure during DMP.
Thus, the copolymer has a star-shaped structure containing one MA core indeed as designed.
The analysis on these combination shows that, copolymers have both one-core structure and two-core structure simultaneously indeed.

A detailed crystal structure determination at variable temperatures, in particular above and below the spin transition temperature, and after LIESST is most essential in revealing the nature of temperature and photo-induced spin transitions in solids.
The lattice parameter a is doubled with comparison to the high and low spin structure (Fig.1b).
Fig.1 Projection of the superstructure in the intermediate phase at 118K (P21/n, Z=8) (a) and of the high-spin structure at 200K (P21/c, Z=4) (b) of [Fe(pic)3]Cl2 .EtOH along the monoclinic b axes Conclusions In the progress of spin crossover transitions diffuse and satellite reflections supply information about the short and long range order between HS and LS molecules which may exist in an intermediate or low temperature incomplete SCO phase.
H.Spiering, T.Kohlhaas, H.Romstedt, A.Hauser, C.Bruns-Yilmaz, J.Kusz, P.Gütlich, Coordination Chemistry Reviews, 192 (1999) 629 9.

This may also indicate that the structure of the product was not so stable under UV lamp, the high energy of UV may cleave off the double bond or some other structures of fluorescent groups which eliminate the photoluminescent intensity.
The reason should be that some parts of the fluorescent structures may be destroyed when the temperature goes too high.
Liu, et al.: The journal of physical chemistry.

The effect of this kind of combustible materials is represented by: - affecting the safety of building’s occupants passing through the evacuation routes (thermal radiation, temperature, visibility and gas toxicity); - affecting the structure of the building (temperature).
Using the “simple chemistry”, the combustion model involves the existence of a single fuel that is composed primarily of C, H, O and N that reacts with oxygen in one mixing-controlled step to form H2O, CO2, CO and soot [2].
Floyd, Fire Dynamics Simulator – User’s Guide, National Institute of Standards and Technology Special Publication 1019, USA, 2014 [3] ***, Actions on Structures.
Part 1-2: General Actions – Actions on Structures Exposed to Fire.

Synthesis and Photocatalytic activities of Bi2WO6 Three-Dimensional Hierarchical Microstructures Xu Chun Song1,a, Rong Ma1,b 1Department of Chemistry, Fujian Normal University, Fuzhou 350007, P.
The high-magnification SEM image in Figure 1b clearly demonstrates the shape of a single three-dimensional hierarchical structure microsphere.
It is found that the interesting Bi2WO6 with three-dimensional structure microsphere are composed of Bi2WO6 nanoplatelets.
The Bi2WO6 products are three-dimensional hierarchical microspheres with diameters of 5 μm, and Bi2WO6 with three-dimensional structure microsphere are composed of Bi2WO6 nanoplatelets.

The molecular structure of the above 6 PAHs is shown in Table 1.
Table 1 Molecular structure of the studied 6 PAHs Name Molecular structure MeCA DB(a,h)AC DB(a,i)AC DB(a,e)P DB(a,h)P DB(a,i)P Sample Extraction and Analysis.
Acknowledgements This work was financially supported by the National Natural Science Foundation of China (No. 20877011); the Chinese National Programs for High Technology Research and Development (No. 2011AA060604); the State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Science (No.

Synthesis of nano onion-like fullerenes using iron supported on sodium chloride as catalyst by decomposing acetylene Cunjing Wang1, a, Peng Yao1,b and Gairong Chen1,c College of Chemistry and Chemical Engineering, Xinxiang University, Xinxiang 453003, China a wangcunjing@126.com, b yaopeng874@163.com, c xxcgr@163.com Keywords：Nano onion-like fullerenes, Acetylene, Chemical vapor deposition, Sodium chloride.
It can be seen that the nanoparticle had a typical structure of NOLFs encapsulating metallic cores and the metallic core was encapsulated by 14 clearly concentric graphitic layers.
Figure 2 b) also suggests that as-synthesized NOLFs had some defects in the structure, which maybe result from the low reaction temperature.
Due to the metallic cores inside the NOLFs were pure Fe, it is assumed that the growth mechanism of the NOLFs can be according to the vapor liquid solid growth model [6], which can be summarized as carbon-solvation, diffusion in the catalyst particle or surface diffusion, and precipitation growth of graphitic structures.

China 2 School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, P.
Preparation and structure of porous HAW/-TCP ceramics.
Fig. 5 SEM photograph of fracture surface of porous HAW/-TCP ceramics Fig. 6 Rod-like grains in pore walls of porous HAW/-TCP ceramics Fig.5 shows the SEM photo of porous structure of HAW/-TCP ceramics as-fabricated in this paper.
However, the authors become aware that the function of HA whiskers on mechanical properties improving was suspectable due to the high porosity and loose structure of pore walls (many micro pores exist).

These observations may suggest that Ag and Pt are all in face-centered cubic structure but they are not fully alloyed [12].
The XRD results indicate that six catalysts are all in face-centered cubic structure.
Structure and Electrocatalytic Activity of Carbon-Supported Pt−Ni Alloy Nanoparticles Toward the Oxygen Reduction Reaction.
Journal of Solid State Chemistry 2008 (181) 1546–1551 [12] Dan Zhao, Yuan-Hao Wang, Bing Yan.Manipulation of Pt - Ag Nanostructures for Advanced Electrocatalyst.

Determining the degree of mobility of building systems Oleinik Pavel Pavlovich1, Grigorieva Larisa Stanislavovna2 and Brodsky Viktor Isaevich 3, 1 Doctor of Technical Sciences, The Department of Technology and building organization of production, Moscow State University of Civil Engineering (MGSU), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation 2 Doctor of Chemical Sciences, The Department of Composite Materials Technology and Applied Chemistry, Moscow State University of Civil Engineering (MGSU), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation 3 Ph.D, The Department of Technology and building organization of production, Moscow State University of Civil Engineering (MGSU), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation pehel@yandex.ru Keywords: Construction of buildings, mobility, system, labour force, material and technical resources, stages, organisations, buildings, moved, permanent constructions, intensity.
This property is connected to the constant mobility of labor resources, relocation from one object to the construction of machines and mechanisms, delivery structures and materials, the use of mobile buildings.
Each object contains erected mobile elements that provide the necessary production and social conditions for workers, and for every construction organization has an extensive range of items such as sets of machines and mechanisms, mobile sets of buildings and structures, etc [1].
In this part of the resources of a construction company belonging to the category of stationary (permanent buildings and structures, machinery equipment, etc.) are not eligible for relocation to new areas.